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1. VI Diiss Ir 0 y Distra PUT FE Disses SE Law apo UE Play Control settings SB Live Sample Champion PRO 3 8 User Manual p 107 RECORD Control Enable Line In set level to middle Disable all others ER Record Control 7 z Imp x ogion E o E l m MEN CO Suda Uneln Microphone Aulan M ave Bilanciamento Por 4 Bilsncimenta Bilancsamenta Biangameria Bilangamerko Bhanciamente Jone ego Us ae Nos festi ce Volume H volume ohne Volume Volume M otume Selesnna Selemona v Seleziona Seleziona Seleziona Seleziona ISB Live Wave Device Select Record Control settings SB Live In Settings General set 1 Channel In 1 Channel Out 16 bit Buffer Length 4K Block 16 Mode Repeat Sampling Rate 48000 Hz Step 4 MLS type 4K Level 50 9 4 Now press Syncro Start Stop MLS and Sampling button happens Correct Loop Back Impulse Response Sample Champion PRO 3 8 User Manual p 108 If you will see a still Impulse Response like in the above figure congratulations you are lucky Sample Champion is running correctly and your hardware software configuration is suitable for MLS measurements Anyway some other tests with different parameters are suggested for an extensive test 0 000 E gus im 4 000 1 nn Absence of signal Loop Back Impulse Response If the computed Impulse
2. A dut of etes Talon f Audio G Convahe Applet iiri da hehe G Dig Room Lompenzstion 5 Fs Applet Floating Pont Frequency Domain L Jta spe ainoaa PEH WAW Fie Mea PRLS Tire Domar Daa irn ASC Tert Data f xt Ld E 9 The following formats are supported for input files IRE Impulse Response native format 80 bit floating point SPE Spectral data Real Imaginary parts native format 80 bit floating point WAV PCM 16 24 and 32 bit integer and IEEE 32 and 64 bit floating point TIM MLSSA data FRD Frequency Response ASCII format TXT ASCII raw exported data Opening a file of a certain type the corresponding window will open if it is not already open Global sampling rate is adjusted according with the loaded file When a file is selected in the list some information will be shown on the right side of the window Multiple views of the same file can be opened by using the corresponding button or measurement selection Most Recent Used files are added in the bottom of the File menu If the Show Open Dialog option at the end of File menu is checked the open dialog is shown when a file in the MRU list is selected otherwise the file is opened Sample Champion PRO 3 8 User Manual p 12 iB See also Settings File Options FRD files are an ASCII stadard format for frequency response exchange between different software systems This is an FRD file f
3. Sample Champion PRO 3 8 User Guide by Paolo Guidorzi PureBits com Sample Champion PRO 3 8 User Manual p 1 Welcome to Sample Champion Sample Champion is a powerful real time dual channel MLS Maximum Length Sequence analyzer We recommend a careful reading of this manual before using the program For a survey of the program read General Overview then go to Quick Starting Guide Contents PIONS SLANG RETE TTE MTM 5 General OVEPVIOWLsseneditirhar enia buta wx uibet DX dXX P EAS ANREISE Eri IA ESO DUDAS 6 OV SUS St I SSNS uscecsxnt duae uunc eae seeu eine asinine cayenne a oo NEU MN Su Ltd eDUN dM NEUE T OWCE arn eie NR T EEE A E E E A A AR 8 File Management 9 eea E E E E E E 12 vc 14 Measurement types SCOPE ANITO OW ERR UU 16 Impulse Response Window ssessessesssssseeeeeneennnn nnne nnne nenne sensere sanis 22 Ereguency Domalb vVIl does mede tuiscticdtiecu tetas Ihe ececana tiene uude s DU ue UR SUD dcm EM UEE ses 26 Measurement Type SC eie T T T TM 35 Settings Ear MUTET 37 AYIEE 44 x e X 47 COMPDEN 6 ee ere 49 a aE a REN E Um 56 P TOWO erer A A E EE EE 64 FIG ODIOM sarene era EE E A E EE 65 Quick Settings AUKO SENN OT T Tm 68 Tools Measurement geometry GellDisssiecaociecor did edsene eo ode po SU
4. Sample Champion PRO 3 8 User Manual p 79 Smooth Spectrum Data This is a post processing function for smoothing spectra The number of cycles can be selected to obtain a more deep effect JEN 1 re Processing Window Hep haga Invert LR Reverse LR Normalize I R Peak bo i Find and subtract LR Offset Wrap IR b Move Impulse Responsa Peak at k Move Impulse Response Peak at X 100 at Measurement Cycle End Increase FFT Spectrumfs Magnitude 105 Incregse FFT Spectrums Magnitude 505 Decrease FFT Spectrums Magnitude 1dg Decrease FFT Spectrum s Magnitude SdB Normalize Narrow Band FFT Spectrumis Magnitude Set peak top ak Q dB amoch Spectrum Data Fie Operations Spectra Marge poke Mic Weighting to E R Tims Domain Apol Inverse Pic Weighting to LR Tire Domain Apah Frequency weighting A B C U or AL bo LR CTime Domain Apol Inverse Frequency weighting A B C LI or AU Eo LRE Tine Domain Apply Pink Fibering ta ILR Time Domain Apply Inverse Pink Fitering to LR Time Domain Paper ras Power fale The smoothing is obtained performing a moving average on the frequency data The spectrum after the smoothing will have only Real data the Imaginary part is set to 0 The original unsmoothed spectrum can be restored by pressing F5 refresh Sample Champion PRO 3 8 User Manual p 90 9 File Operations Frequency files SPE and Impulse Response fi
5. Scope Sel Chancel 1 C 2I Load Sane etsun j Cancel ca All the frequency windows in the main program must be closed when RTA functions are used In the SIGNAL ANALYSIS FUNCTIONS window the FFTs of one or both input channels can be plotted simultaneously using different graph options Note that in some cases when the FFTs of both channels are plotted it could be necessary to use the line plotting option to prevent the masking of one channel by the other Sample Champion PRO 3 8 User Manual p 87 Also 1 3 Octave and 1 1 Octave plot of both channels or of a single one are available It is possible to optionally write the Octave or 1 3 Octave value and frequency directly on the plot Sample Champion PRO 3 8 User Manual p 88 1 um tB En From the FFT data of the 2 input channels it s possible to perform in real time and plot the following DSP functions Transfer function L 1 R 2 Frequency Domain Transfer function R 2 L 1 Frequency Domain Cross Spectrum L 1 R 2 Frequency Domain Cross Spectrum R 2 L 1 Frequency Domain Coherence Frequency Domain Auto Correlation L 1 Time Domain Auto Correlation R 2 Time Domain Cross Correlation Time Domain Correlation Meter Stereo Check Sample Champion PRO 3 8 User Manual p 89 9 Transfer function This function performs the c
6. fl 115 EUNE S fl 113 a5 o 3003 I f 1 115 10 1 121 T7 C3 Meo D co ra H 000854 0 017855 20 30 4050 100 200 30040500 Zk Gk 4k Sh6k k 10k ET Sample Champion PRO 3 8 User Manual p 99 9 IMD InterModulation Distortion measurement umm This parameter gives a measure of the distortion caused in the device under test by two pure tones cross modulated power The following harmonics are considered Tone 1 f1 Tone 2 f2 f2 f1 f1 2 f2 f1 f1 f2 f1 f1 2 f2 f1 f1 3 f2 f1 2 f1 f1 f2 2 f2 3 f1 2 f1 f2 2 f2 f1 3 f2 The IMD value is computed as the ratio of the sum of the power levels of the intermodulation harmonics to the sum of the power level of the two strongest tones Measurement procedure In the Custom Signal Window two pure tones must be selected Select the IMD function and start a SYNC REC PLAY E31 measurement cycle A Common choices of the two fundamental frequencies are SMPTE 60 Hz and 7 kHz 4 1 ratio DIN 250 Hz and 8 kHz CCIF 19 kHz and 20 kHz Sample Champion PRO 3 8 User Manual p 100 9 Load and Save Spectra in RTA window opectra measured in RTA window narrow band 1 1 or 1 3 octave can be loaded and saved The functions Transfer function Cross Spectrum Coherence Auto Correlation Cross Correlation can be computed in post processing mode on loaded dat
7. BEFORE STARTING READ CAREFULLY To prevent any resizing or reallocating of the virtual memory during measurements Sample Champion allocates once started ALL RAM memory and system resources required for working This software requires a substantial amount of RAM memory and system resources This is a consequence of the very high accuracy used for all internal operations For example the FFT limited for the user to 64K but extended for some internal operations to 256K is computed on double precision complex data and using both frequency bands positive and negative frequencies to perform some specific signal processing operations IF error messages such as Plugin default not found Canvas does not allow drawing Uncorrect parameter appear most probably Sample Champion does not have enough system resources available for running correctly Solution Leave at least 2 300 MB of free space on the disk where the Windows swap file is allocated usually disk c Close any other software before starting Sample Champion this is always recommended Disable all running programs and system tasks Check the active running tasks pressing once CTRL ALT DEL Tip click on the windows taskbar Start Run and type msconfig then in the Automatic otart section uncheck all the useless tasks and reboot the system Ideal system configuration pressing CTRL ALT DEL only Explorer is shown the system tray right bottom corner o
8. Peak Input Level s Os 9 This button can show or hide the control bar on the right of the screen To reposition the control bar at its original position move it outside of the screen on the right and press twice this button 9 The control bar are shows some important information on the current measurement parameters and state Sample Champion PRO 3 8 User Manual p 72 Floating Menu 9 The most important menu commands are available in this menu Right click on the program desktop or on the control bar to open this menu Start Stap Sunc Aec Play Open Into Window on start tart Stap Hec only Other commands i 5 Refresh rart Stap Signal only Impulse Response Window Scope Window Spectrum Flugin window Open file Save file Settings Quick Settings Miser Ej Info Window Ei Control B ar fa Sample Champion Processing d Personalization Personalize your copy First Mame ohn Last Name Smith Company Audiol 000000000 City Les Angeles State County Ealifomia 000000000 Address Sunset Boulevard 12340 Close The program can be personalized with Name Address Sample Champion PRO 3 8 User Manual p 73 Sample Champion Tweak Set default values TrQut Sampling frequency 48 Khz In Out 1 channel In But buffer length 4E samples FFT length 4K points S l Set and Close Sample Champion W Enable Low System Resources
9. ckaus t gars Custem Filter IEC 1200 swe Fibers Cus Nd Fiber Type IEC JE 17 Oetaue Fiters P ze oxide Filler Ordar f Custom 15 a a High Pass b a m s E iuan Fim C 8m E fe mm Sample Fte Af Hz B us t7 n a N Fiter Type mo Pass rs i Puramorh e Prototype BUTTERYIGETE un am a eis Order C BD i n Chaby ahas I dB Pass Band 1000 2000 He 7 apo r am Pazshzrd IIR Fiber Coefficients r Sii ficos ad bo E a Fi apb d00147200E15291151 bp F 200 a s0 b I s 5 00i TS E on ap 0 D074 003240172453 b eti 3512857162384 o a ij b 3 18 3508723245975 300 apH rima Ir ex 1 502 hp mra SSB Sear C Fan apnd h 3 m 5 TIES 253013 Cox ap 7 0DUZAPTDOB14281141 b 70 763520 842248 182 L ui i i E EE 0 Achon TT ERHEE Eee Part af Serle Cyamplon amp Copyright 2000 by Paolo Guidorzi E Sample Champion PRO 3 8 User Manual p 113 This module allows to approximate BUTTERWORTH and CHEBYSHEV low pass band pass and high pass analog filters by means of IIR Infinite Impulse Response digital fillers Moreover two banks of IEC 1260 Octave and 1 3 Octave Filter Banks are implemented as presets This module can be used to filter a measured or loaded impulse response The computed coefficients of the IIR filter can be exported to clipboard 9 The plugin is included in the setup package More information
10. Data Type Scope Impulse Response N lR Normalize peak to 1 Scope Apply calibration Impulze Response When save as WAV normalize peak to n 16 bit Pc 32 bit PCI Peak 1 IEEE WA Disable When save a STEREO Impulse Response or Scope as TIM save f Channel 1 C Channel 2 Export Frequency Data as THT ASCII file Values separator ch lt gt 44 ASCII Magnitude Lin Phase Magnitude 5qu Real Part End of Line ch i 32 X ASCII W Magnitude 5qu dB Imaginary Part Susces between vales i m Export Impulse Response Data as TT ASCII file From sample n fo m to sample n 4096 4 Beds w Lhanne Export Scope Data as TT ASCII file Channel 1 From sample n fo to sample n 4096 aj W Channel 2 Load Save Defaut Cancel Simple Form Save Impulse Response as WAV Impulse Response can be exported as WAV file The following WAV formats are supported PCM WAV 16 bit Integer format PCM WAV 32 bit Integer format IEEE WAV 32 bit Floating Point format IEEE WAV 64 bit Floating Point format The WAV type can be selected in the drop down menu of the Save window Sample Champion PRO 3 8 User Manual p 65 Set curent directory as Defaut te Mew Dir Mew dictar Impulse Response 1 ie Save Floating Port Impulse Response a6 EXTX Floating Paint Impulse Response 11e MLSSA Time Domain Data mim Windows PCM fi
11. Two methods for reconstructing the Microphone Frequency Response are implemented Spline The user can manually try to reproduce the microphone frequency respone curve when only a graph is furnished by the microphone manufacturer This is an empirical method Microphone compensation Microphone Frequency Response EE ETEEUENCCECPCENENEDENEETCUECETETETITTEEECT TET Frequency Hz Spline method Manufacturer Calibration File Polynomial Degree m Tot Gain dE p s Fiat Freq Hz Gain dB Freq Hz Gain dB Freq Hz Gain dB o s foo j ono 7 a po s j mon 13 3 2500 je a fo fe i ao js a eno s a am fe son hs j 500 ije sj mn L a oon fe sj sso js sj Load Cave cs se d 5Diata Wic Comp Examplez 1Hl MOTE anh the magnitude af FFT data is compensated Phase and Close time data remain unchanged Frequency Response furnished by the microphone manufacturer This function adds the capability of recognizing microphone frequency responses ASCII format Now the microphone can be perfectly compensated by means of data furnished by the manufacturer The range of the microphone compensation extends up to 48 kHz The format of the compensation ASCII file must be selected manually Sample Champion PRO 3 8 User Manual p 51 Microphone compensation Microohone Frequency Response i nn Sree Eee ee oan ae EPE amend meal ese ese eat tt A D Epp E A T MEM
12. messages such as Plugin default not found and other fatal errors during startup Solution Leave at least 200 MB of free space on the disk where the Windows swap file is allocated Close any other software before starting Sample Champion this is always recommended Sample Champion PRO 3 8 User Manual p 106 Troubleshooting Most common problems and solutions The first configuration to be performed before making any test measurement concerns the audio card mixer In the following examples a Sound Blaster SB Live audio card is considered but the suggestions are valid also for any other device The operating system was Windows 2000 9 1 Connect Line IN to Line OUT with a jack jack cable and start Sample Champion Open the Impulse Response Window 9 2 Close any other software including any taskbar application 9 3 Open the internal Sample Champion mixer or the standard Windows mixer and enable ONLY the following PLAY Control Enable Play set level to middle Enable Wave set level to middle Disable all others E Play Control i lal x Play Control Waren Mm CD rabo Lastiri Maeropbora PO Speake fundar F Blancianeria Exanicocwwenda Binc ionic Bianciamente Fiorano Edanciyventa Biamet dE iet Lig ris imc LAN Lats io L VH Bau le only thes 2 fe Desa 4 Disia F Disstivs
13. soo xol n wl pen FHE egin Feuer rdr Lower Fre3 Mey zu Fecresh This module extends the Impulse Response view modes and analysis It can compute and plot Energy Time Curve Spectrogram Nyquist Plot Phase Unwrapping Minimum and Excess Phase and Minimum Phase Impulse Response Plot Mygsast Plo Fain 163 Frequency 1310 159625 He Peal Sel A EGTASIPTTBDATATT Imm Bel eh ABI FAs ASS Fl Sel E 14 F0028D 728314 imm 24 E MEE e rd 152004 Atami Pia deest Sample Champion PRO 3 8 User Manual p 116 Wun STAR Iz na AgTo 00 More information and instructions about using the Enhanced View plugin can be found in the Application Note 15 Impedance Plugin Impedance Impedance Plot Thick Small Parameters User lapul Thieke Sraal Pararretecs Computed i Jn peclerie id 7 7 ig m freta configuration f Configuration 1 r Tra 2 Corbgurstin nts Lasguk METET pha pee Frodo He Sanne Cend iee x Oder Pasiva Beste Ry ioo om fzzxm Leg Top i Tan 1m jette p monafio Sf teres EE Cakraten Faster 15 ten E id D zin MILI fes e prs a zn oe wm x Tee iO EE zi mix Fran Pepe wl Load Cake qe M Mix ft Swen ul i Pi Prae EY Leaded add Daar Cakorian awe Catkrsiien This module allows measuring Loudspeaker impedance and the computation of Thiele Small parameters More information and
14. 1 1 Loudspeaker Position 2 0 85 Sample Champion PRO 3 8 User Manual p 81 Loudspeaker Position 3 0 80 Loudspeaker Position 4 0 75 Loudspeaker Position 5 0 5 Loudspeaker Position 6 0 45 Loudspeaker Position 7 0 55 Loudspeaker Position 8 0 85 Loudspeaker Position 9 0 90 Loudspeaker Position 10 1 A TXT file with these values will generate a Position Weighting associations list as shown in the following picture Position Weight Loudspeaker Position B Loudspeaker Position r Loudspeaker Position 8 Laudspeaker Position 3 Loudspeaker Position 10 Set Danc L SC do Data Detault Positions File tt Cancel Close Sample Champion PRO 3 8 User Manual p 82 9 Spectra Merge Fiete Trp Fiet HET ema Pot r Pot beth file T end Pile 2 ir Corban Ba 1 ard Ba 2 p a Frans c Full BON EE dE ua MORE NER EN NS Lese Frequency spi Frequens 25 5 Hz al SS SS Sa Spector File re Lead Cn EC Deas Lower Cie ie 1 int AHE Uya S pecikun 1 rah Secure 2 4 S pli Fisquancy Draping Pepa 4DDOO Fir Coechure File 2 lupe E Lead C OI ensis pepe CR ape EFT fires 4E REFI o E Sana Finney AEC 1 FFT Ein 4E Ere lesen Foeculi Clos This function is very useful for merging Nearfield with Farfield measurements This function can be activated from the Processing menu This is an exam
15. 8 User Manual p 57 f the input level is too low open the mixer and adjust it Locate the X value of the impulse response peak by moving the cursor on the wave use the Locate Peak button and the Show Info on Image for help Open the Settings Calibration window and insert the X value found in the Latency Time Calibration field changing its sign and check Manual for example if X 112 write 112 Repeat the single measure procedure and search for the peak Now it should be located near zero the t 0 value is not visible If this does not happen adjust the latency time value until the peak is in the proximity of zero Remember that the Impulse Response recovered using MLS is wrapped at the end of the buffer length an excessively negative value will cause the impulse peak to move to the end of the data buffer In this case simply increase the inserted value as much as necessary Note every audiocard has a specific latency time value Just one measurement is needed The latency time value could change when audio card drivers or configuration are updated and in rare cases changing sample frequency AUTOMATIC LATENCY TIME CALIBRATION DYNAMIC This option allows a very robust synchronization of your soundcard and avoids all errors due to data sync loss It allows extremely accurate measurements when used in the Average mode When the auto sync function is active the time latency calibration that depends on many
16. Battem Refresh ES Selection 4 in Impulse Response Window 2 Fower a5 E S as m Cn i a n En TN 200 300400 4k 2k Frequency Hz Sample Champion PRO 3 8 User Manual p 30 IFT Inverse Fourier Transform 12 This function performs the Inverse Fourier Transform of the spectral data content when possible Depending on the type of spectrum see ID type the resulting time data are stored as scope data or impulse response data oample Champion saves and load spectra as SPE files including Real and Imaginary components in order to achieve a perfect reconstruction of the time data by means of the IFT The IFT button also automatically opens a time window containing the result of the Inverse Fourier Transform 9 Edit Frequency Data 13 Frequency D omain E dit Frequency Range From 50 zi to 20000 zi Hz Operation Add to Magnitude Spectrum 0 dB C Set Magnitude Spectrum ta JO dB Cancel This feature implements a simple frequency edit function 9 Frequency Data Overlay 14 Power cie E n 30 4 00 as ET Frequency Hz Frequency data in any view mode can be overlayed Up to 5 curves can be simultaneously displayed current data and 4 overlays Frequency data drawing mode must be set to Draw not Bar Y Axis and Y Scale can be freely selected The X Axis Sample Champion PRO 3 8 User Manual p 31 can be Li
17. Decrease FFT Spectrumis Magnitude 1dB Decrease FFT Spectrumis Magnitude 5dB Normalize Marrow Band FFT Speckrum s Magnitude Set peak top at 0 dB Smooth Spectrum Data k File Operations Spectra Merge Apple Mic Weighting to LR Time Domain Apply Inverse Mic Weighting Ea LR Time Domain Apply Frequency Weighting A B C LI ar ALI to LR Time Domain Applv Inverse Frequency Weighting A B C LI or ALI to LR Time Domain Apply Pink Filtering Ea LR Time Domain Applv Inverse Pink Filtering to ILR Time Domain Clear all Data Buffers Some useful post processing functions can be accessed from this menu 3 Invert I R This function changes the sign of the current I R Reverse I R This function reverses the current I R with respect to the middle time point 3 Normalize I R Peak to 1 This function normalizes to 1 the peak value of the current I R Sample Champion PRO 3 8 User Manual p 78 9 Find and subtract I R Offset This function finds the continue component and subtracts it from the current I R This can be useful also when the Remove offset from sampled data option in Settings Advanced is enabled because here the operation is performed on the final I R and not on the raw sampled signal before the computation of the Impulse Response 9 Wrap LR 100 discrete points Fight Move Impulse Response Peak at b 100 discrete points Lett Increase FFT Spectrum s Magnitude
18. I 20 30 4050 100 200 300400 ik eh Sk 4k Ek Shi k 20h 4 k Frequency Hz Spline method Manufacturer Calibration File Manufacturer Microphone Data File Format ASCII Comment and other information lines E zi Column 1 m Column 2 m Column 3 m Column 4 Freq Freq Response Response m H m Index Resp s 7 Phase ignored s 7 Phase Ignored 5 ae cea eife RE EA AIOE VEL Weird CL Edo NOY L Staus RECOGNIZED view ASCII File Check Beie i Load Unload case d oADiata Linearx MOF Sn201281 m df txt Compensation iode NOTE only the magnitude of FFT Manual data is compensated Phase and Close Manufacturer Data time data remain unchanged The above figure shows a configuration example for recognizing a microphone compensation file in the following format MDF Microphone Data Format File Author LinearX Systems Inc Date May 3 2000 Wed 11 52AM Model M53 Serial 105271 dBspl 94 00 dBm 14 16 Points 552 Index Freq Hz dB Deg EEEEENSENNENENISNES dE eles Pll Se es Ae 2 2e 3d eed cube O00 tu deeds esa OO 000 A SEU A ub cd 0 STU Oe d ceri rub EDS pod edo Ur PER EUR Um EO er PT Sample Champion PRO 3 8 User Manual p 52 NOTE to use spectrum data exported from Sample Champion as Mlicrophone Compensation files select the following settings FFT Size 1K points Expo
19. Monitor AK fd Quick Sample Champion start Don t ask uit when exit Miter Application None Selected C Standard Windows Mixer Application Sample Champion Internal Mixer Application f Mixer provided by manufacturer of the audio device recommended E S Programmi T BSVwINAPPS SPemier exe Browse Close Sample Champion Close this window Some optione will be enabled next time Sample Champion is started This window iz shown if previously Sample Champion was interrupted abnonnally 9 Here some emergency and service functions can be accessed The selection of the mixer application is located here 9 In some rare cases the Full duplex test performed when the Settings window is opened causes troubles and errors This test can be disabled from this menu 9 Under Windows 98 it is available a global system resource monitor integrated in Sample Champion The resource usage level information is located on the remote bar Svthes AN 31 7 CH Res NN 31 User Res EET Sample Champion PRO 3 8 User Manual p 74 When system resources are too low a warning window is opened and some actions are suggested Fiescs ciae ANT othe polos In rod pate insist Ta arecid thin ierra c choos ANY other software BEF FE Macau vno Done Chark eiusd n nideg noe mn jour 2 pere pos ey once the ke CTRL ALT s DEL Tus lenit SC Rog 5 I Temra caire EEE tena fraia Optimiead Sy ERHEN Tite ees A z
20. Paolo Guidorzi DISCLAIMER OF WARRANTY THIS SOFTWARE IS DISTRIBUTED AS IS NO WARRANTY OF ANY KIND IS EXPRESSED OR IMPLIED YOU USE THIS SOFTWARE AT YOUR OWN RISK THE AUTHOR WILL NOT BE LIABLE FOR DATA LOSS DAMAGES LOSS OF PROFITS OR ANY OTHER KIND OF LOSS WHILE USING OR MISUSING THIS SOFTWARE TO THE EXTENT PERMITTED BY YOUR APPLICABLE LAW NO WARRANTIES EITHER EXPRESS OR IMPLIED ARE MADE WITH RESPECT TO THE SOFTWARE INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE THE AUTHOR DOES NOT WARRANT THAT THE SOFTWARE OR ANY FUNCTIONS CONTAINED IN THE SOFTWARE WILL MEET YOUR REQUIREMENTS OR THAT THE OPERATION OF THE SOFTWARE OR ANY COMPONENT OF THE SOFTWARE WILL BE UNINTERRUPTED OR ERROR FREE THE AUTHOR HAS NO OBLIGATION OR RESPONSIBILITY TO CORRECT ANY ERRORS OR DEFECTS IN THE SOFTWARE This SOFTWARE is not fault tolerant and is not designed manufactured or intended for use or resale as on line control equipment in hazardous environments requiring fail safe performance High Risk Activities Paolo Guidorzi specifically disclaim any express or implied warranty of fitness for High Risk Activities Good data processing procedure dictates that any program be thoroughly tested with non critical data before relying on it The user must assume the entire risk of using the program LICENSE RESTRICTIONS You may not modify the SOFTWARE or create derivative works from the SOFTWARE Yo
21. Response 4 Open the Filter Banks Plugin and filter the I R as desired 5 Save the I R as a WAV file and set it as custom MLS signal Now the filtered MLS can be used Note that the MLS type selected in the Settings MUST have the same order AND TAPS of the custom MLS file for a proper reconstruction of the Impulse Response Sample Champion PRO 3 8 User Manual p 40 Power di 2 PT 11 E mM Dim n en T m LR r mi ru Ld v tk Frequency Hz Example of Loop Back Impulse Response measured using a band pass filtered MLS signal 9 The Level value is the percent level of the generated digital signal referred to full scale independently from mixer settings 9 By means of Load and Save buttons it is possible to load and save the current global settings from to an INI file d Note that the program settings are updated only when the settings window is closed by pressing the OK button 9 The Custom signal button will open a window for selecting either a multi tone square or ramp signal or a custom WAV file The actual frequencies of the generated signals are slightly different from those written by the user in order to have a perfect correspondence with the discrete frequencies analyzed by the FFT An increase in the FFT length will reduce the difference between generated and desired frequencies Frequencies Actual Frequencies Level Sine 7 400
22. The OUTPUT SOURCE SELECTION list shows all available sound card outputs If a source is checked the corresponding output is enabled 9 The INPUT SOURCE SELECTION list shows all available sound card inputs If a source is checked the corresponding input is enabled It is recommended to select ONLY the input line or mic and the output wave out sources strictly necessary for the measure see for example the picture above concerning a Turtle Beach Pinnacle audio card D Generally speaking it is better to use the Line In input instead of the Microphone input because Line In has a better signal noise ratio There are however some positive exceptions for example the TB Pinnacle audio card that can handle also condenser microphones with phantom power Sample Champion PRO 3 8 User Manual p 70 Measurement Info Window Z Measurement Information Sampling Info Acquisition History nfo Measurement remaining time 00 00 01 c MEME LA Feak Moisefloor ratio W Enable Left Channel 78 10 dB Right Channel M A dB A RERPRUR LASS eae ees he i eee tae Noisefloor from 1 t Impulse Beginning Peak Input Level Sampling Settings Impulse End Lett 25 8 48000 H2 246 it MONO a End 10 lt Fight 23 Buffer size AK Status ADJUSTING Sampled Data 222 Kbytes Peak Positions Check Stark Stop Measurement Cycle Close Emp TOK 9 This window shows some informa
23. Window Press to have a more comfortable view if you are using 800 x 600 pixel windows desktop setting it could be useful to hide the taskbar to get more work space Now press and a single cycle MLS measurement should be performed Click 2 times on the Show Info on image icon inside the Impulse Response window to see extra information lf you are testing a loudspeaker the Impulse Response should look like the following picture obviously with the Impulse Response of your loudspeaker Sample Champion PRO 3 8 User Manual p 9 Zoom axis x1 00 Y axis x 1 00 LA Peak tz5 ben mz Y21 5 Volts Peak Mode Single Cycle I 4k MLS Taps 12 11 10 2 Fs 44100 Hz Oe 0 023 mz Filename Ib ir or Tu D io LET rz E If you are using the loop back cable the Impulse Response should look like in the following picture Zoom LA Peak tz2 608 mz YTz21 5 Volts Peak Mode Single Cycle Hak MLS Taps 12 11 10 2 Fs 44100 Hz Dir 0 023 mz Filename Impulse Response 1 Note that for this test the latency time calibration has been manually set to zero As side effect of the loop back measure we have found that the sound card used in this test a Turtle Beach Pinnacle has a latency time of 2 6 ms corresponding to sample number 115 so the number to write in the latency time calibration setting is 115 But leave this setting disabled at present Should the latency time have been compensated
24. anyway recommended Sample Champion PRO 3 8 User Manual p 75 Sampling Engine Commands Rec Play fyne j leasurement lade z Re 2 b ul E Record This button starts the sampling engine without starting the signal generator Play This button starts the signal generator without starting the sampling engine l Sync Rec Play This button starts the signal generator and the sampling engine synchronously Windows Managing Case file Minim Refr m Quit r Web amp Cascade This button arranges all child windows inside the program in the Cascade mode E Tile This button arranges all windows inside the program in the Tile mode It is particularly useful when only 2 windows are open for example Impulse Response and FFT of Selection A of Impulse Response Minimize This button Minimizes all child windows inside the program Refresh This button Refreshes the plots in all child windows inside the program NOTE The refresh action has also some side effects such as reprocessing the data in all enabled selections see previous sections Sample Champion PRO 3 8 User Manual p 76 RemoteSC i Sample Champion Remote Command Manual commands Sync REC PLAY Save lA as TXT Save 1A as WV SawvelH as TT file when finished Save LA as WAV file when finished Close Remote File ame Jo temp file wav Browse Command line usa
25. be performed on the sampled data This dialog can be used for opening the Frequency Domain Window above 9 In this window it is also possible to open or close plugins Measurement Type Selecion Frequency Domain 2e Soectrue Du Selection in Tine vinda 1 hr Selection amp in knigulze Fezpanze Window 2 lr Selection B in impulsa Responsa Vires 3 Tirta Domai gt Phage E23 Tine Reverse Plugin Wri 0 2 5 a Time Domain 9 Three standard types of analysis are available 1 Selection in Time Window 2 Selection A in Impulse Response Window 3 Selection B in Impulse Response Window 9 Selection in Time Window 1 Clicking here the program will open a window showing frequency domain data magnitude phase real or imaginary part of the using current FFT settings FFT selections can be opened closed also by means of shortcuts buttons on the Control Bar and using the Quick Spectrum button E on the Time and Impulse Response windows Sample Champion PRO 3 8 User Manual p 35 Selection A in Impulse Response Window 2 Clicking here the program will open a window showing frequency domain data magnitude phase real or imaginary part of the using current FFT settings 9 Selection B in Impulse Response Window 3 Clicking here the program will open a window showing frequency domain data magnitude phase real or imaginary part of the using current FFT settings
26. calibraton 1 2 3 imP ascals Peak SPL Peak dB 5 PL AMS dB 3 MANUAL CALIBRATION In the Setting Calibration window the following section is present The manual procedure allows to set a dB Peak calibration without a real measurement The user can assign to a time peak value Scope window raw sampled data a dB Peak power level by pressing the SET button In the example above a peak value of 32767 in Scope window has been assigned to 0 dB Sample Champion PRO 3 8 User Manual p 62 In this way a 16 bit WAV file with a sine signal between 32767 will show a spectrum with a peak of 0 dB With this same calibration a WAV file with a sine between 327 will show a peak in the spectrum of about 40 dB The Scope data info button searches minimum and maximum values of the current data in Scope buffer loaded from a file or measured in real time The uncalibrated maximum data Left and Right channels are automatically written in the LEFT and RIGHT fields of manual calibration Number of data 8192 LEFT CHANMMEL Min value Calibrated 249093 206357378 Max value Calibrated 24913 0253468564 Min value Uncalibrated raw data 7974 7265625 Max value Uncalibrated raw daba 7275 94921875 RIGHT CHANNEL Min value Calibrated 24909 45278535772 Max value Calibrated 24909 8095075713 Min value Uncalibrated raw data 7911 796875 Max value Uncalibrated
27. filtering and the equalization capabilities of Sample Champion A nice solution could consist in using an audio card with S PDIF digital IN OUT and an external high quality A D D A converter 2 Which sound cards are more suitable for Sample Champion Any sound card working under windows 95 98 2000 NT4 in full duplex mode is suitable Nowadays all sound cards satisfy these requirements Some sound cards have peculiar characteristics For example Turtle Beach audio cards Pinnacle Fiji have an excellent frequency response low noise and in our tests NEVER lost a bit of sound data or the sync between input and output audio streams They work very well also on slow computers because of their hardware architecture and efficient software drivers These audio cards are recommended for Sample Champion Last generation SoundBlaster cards ex SBLive PCI128 have a very good frequency response but can be used with Sample Champion ONLY at the sampling frequency of 12 kHz 24 kHz and 48 kHz because they work internally always at 48 kHz Other sampling frequencies are obtained by an internal frequency conversion that can give poor results with Sample Champion Good old first generation SoundBlasters SB16 SB32 some AWE used on slow computers can experience sync losses caused by software interference with the video cards Sample Champion in Blinded Mode performs a workaround Anyway we reccomend to update your sound card Sample Ch
28. response increase the Step value if required see the manual for details until you can read in the control bar the yellow label BUFFER OK for at least 1 second Repeat the above procedure several times If the peak is at the same position at every cycle your computer can perform real measurements with Sample Champion once calibrated the peak will be near t 0 9 Note 1 When a measurement cycle starts it is normal to observe a small change of the peak position that could be advanced or delayed by one or two samples with respect to other measurement cycles The peak must however remain at the same position during a measurement cycle Note 2 See the FAQ about sound cards If you have a SBLive or similar perform the test at 48 kHz 9 Note 3 If the peak changes its position during the test this means that something interferes with either input or output audio streams This is not due to Sample Champion but to the specific software hardware configuration WARNING If this happens all programs manipulating audio data in real time for example multitrack recording or other measurement software on your system could experience the same problems However only performing synchronous playing and recording and expecially using correlation techniques with MLS it is possible to discover them Sample Champion tells you the truth ANYWAY the above test is very significant and if performed correctly with positive results can assure you
29. that Sample Champion works fine Sample Champion PRO 3 8 User Manual p 103 If the problem is caused by the sound card see the above FAQs about most suitable sound cards 5 About full duplex operations should I play at 8 16 or 24 bit the MLS signal Sample Champion can play at 8 16 or 24 bit resolution 8 for backward compatibility with some old audio devices When playing tonal signals it is recommended to use at least 16 bit resolution but when playing MLS signals just a series of K and K where K is the output value it doesn t matter In our tests we didn t find any difference using 8 16 or 24 bits in playing MLS signals 6 My SoundBlaster audio card refuses to perform full duplex operations Download and install the latest driver Remember also to disable 3D spazialization enhancements and set bass and treble controls to zero when performing measurements If any loss of sync is observed see FAQ 4 try also other IRQ and DMA settings because Windows can share some of these channels and some configurations could give poor performances in terms of audio quality Troubleshooting TIPS 1 How can I optimize my operating system for real time audio measurements 2 How avoiding common errors using digital audio cards and improving sampling result 3 In Sample Champion the wave and the spectrum data seem to jump high and low What happens 1 How can I optimize my operating system for real time audi
30. the peak of the measure of the loudspeaker would be positioned at t 0 96 3 56 2 6 and the loop back measure peak would be positioned in the proximity of t O To analyze the measure performed on the loudspeaker now click on the Make Change Selection A icon inside the Impulse Response window 1S The cursor will become a cross Click now on the I R image just before the peak and keeping the button pressed move the cursor to the end of the Impulse Leave then the mouse button Sample Champion PRO 3 8 User Manual p 10 m D LL Wolts 6 0 Time mz In the Frequency domain window now the FFT of the Selection should be plotted in the desired viewing mode Mienitude pog dB dB Peak Ee 200 S00 400 1k Frequency Hz Now Selection A the samples between the two red cursors can be moved or modified using the suitable buttons The plot in the frequency window will change correspondingly The same procedure can be followed to analyze the content of the scope window opening the corresponding frequency window Now you can proceed with time and amplitude calibrations and discover all other great features of Sample Champion The above analysis procedure can be tested also on a loaded file Load for example the demonstration file Sample Champion PRO 3 8 User Manual p 11 pen Save Scope Imp leas EENH E G E w Open File Info Farms
31. 000000000 18 00000000 8187 0000000000 7211 0000000000 This button opens the View Data window Sample Champion PRO 3 8 User Manual p 17 From the View Time Data window time data can be exported as XLS Excel file 9 Save snapshot of the data window as bitmap image 4 This function allows to save the current plot as a bitmap image BMP A dialog is opened when the button is pressed Image Options Image Size Fisels 21000 500 Custom size A O00 m a 500 Image Quality C Low Quality Fast Normal Quality High Quality C Custom The user can now select the desired resolution for the bitmap image After this choice the generated image can be previewed before saving 9 Print the data window 5 This function allows to print the current plot When the button is pressed the above Image Options dialog is opened Here the resolution of the printed image can be selected After this choice the generated image can be previewed before printing Add Page Title Font add here page title Add footer Time Stamp Preview D ata Graphic Image ft sase Wate arene maae TEWE Printer Setup Bs Print Printer Information Canon BJC 6000 on LPT1 Print Width mm 203 Print Height mm 236 Width Fisel 2878 Hight Fisel 4066 Page offset left Pixel 43 Fage offzet top Fisel 43 DPI horizontal 360 DPI vertical 360 Sam
32. 1 20 7245854150 29 370 118 4926662900 36 713 115 53133331 21 44 055 115 1341 750050 81 388 113 81 79614930 55 40 12 810353214 66 053 111 8353342530 3 425 110 967 7310130 80 758 110 17 889503040 oo 110 105 4852925290 95 453 108 8462346300 102 795 108 24635602940 110 138 dUz P307 328080 117 480 107 24246004 70 From the View Frequency Data window data can be exported as XLS Excel file 9 Save snapshot of the data window as bitmap image 3 This function allows to save the current plot as a bitmap image BMP The user can select the desired resolution for the saved image 9 Print the data window 4 This function allows to print the current plot The resolution of the printed image can be selected 9 Set custom colors 5 Custom colors can be assigned to the frequency domain plot A Black and White preset is available Sample Champion PRO 3 8 User Manual p 28 Y Autoscale on current data 6 When this button is pressed once the minimum and maximum Y plot values are set in an automatic way 9 Y Autoscale ON OFF 7 When this function is ON the button remains down the autoscale on the frequency plot is computed at every measurement cycle Tip This function can be disabled after the first measurement If some measured data are out of the plot the Y Autoscale on current data 6 button can be pressed once Round dB Y scale ON OFF 8 When this funct
33. 1 kHz tone Frequencies Actual Frequencies Level Sine jv i00 Hz fioo f xr s Sine o0 He gt fioo Sf rs Sine 19000 Hz gt fioo 3 rs Sine 20000 He gt fioo ers Square 1000 Bares fioo m F 5 Ramp Select wA fle Browse Ok Sample Champion PRO 3 8 User Manual p 95 Then a SYNC REC PLAY f measurement cycle can be started for example with a loopback connection Channel M THD N 0 011909 ID 2 R Bi gan m cjl e V THD Mode Msnual p 4 4 Cus EN view details Whole Range NF Harmonics If the Averaging Mode has been selected at each cycle the SNR value will decrease until the minimum value is reached A data box containing all details about the parameters computation can be shown inside the data box View details option Different methods can be selected for the evaluation of the Noise Floor value in the SNR computation El signal Aha le Peru bora Saree Da op Anara a RI RIPTE Pip ey e repere Te teal ien wee r a afi Ec Ip m epee MAE LOIS AB H5 134 Hehe p MES MH LY Aia SSG eg ME mur a TEH e rae Ea MH For asa BEBI STRI p i Factors MER z a mj E Lae BET 7 25h F THin gaat ra 1 computation of the Noise Floor level as logarithmic sum of narrow band power levels in a frequency range selected by the user This option can be used for estimat
34. 1dE 10 discrete points Aight Increase FFT Spectrum s Magnitude 5dB 10 discrete points Left Decrease FFT Spectrum s Magnitude 1dB 1 discrete point Right Decrease FFT Spectrum s Magnitude AdE 1 discrete point Left 1 z discrete point Aight 1 2 discrete point Left Apply Mic Weighting to l A Time Domain 1 10 discrete point Aight Apply Inverse Mic Weighting ta L A Time Domain 1 10 discrete point Left File Operations These functions wrap the current I R by the selected amount of points also by fractions of discrete points This can be useful when the Latency Calibration Time had not been set correctly at measurement time Note that an I R measured with the MLS method has the same period as the MLS so wrapping doesn t generate discontinuities Move Impulse Response Peak at Move Impulse Response Peak at 2A Increase FFT Spectrum s Magnitude 1d6 100 Increase FFT Spectrum s Magnitude 5dE a 2 These functions are similar to previous Wrap functions The peak can be moved at the selected fixed X position 3 Move Impulse Response Peak at X2100 at Measurement Cycle End When enabled this option automatically place the impulse peak at sample N 100 when the measurement cycle is ended Increase Decrease Normalize FFT Spectrum s Magnitude These functions can be useful for a quick comparision of frequency spectra measured at different amplitude levels See also Edit Frequency function
35. 8 User Manual p 16 9 Pressing the scope button quu an empty window will open When one or more measurements are performed the sampled data will be plotted there Scope Window Features 9 AutoScale ON OFF 1 This function allows to enable disable Y autoscale for the current plot D Tip We suggest to disabled this function after the first measurement and enable it again just a few moments only if the measured signal falls outside of the plot bounds 9 Set View Time Interval Lock Unlock 2 Set ime Hange 0 00 to rog ms This function allows to set accurately the graph time range When it is enabled the scroll bars in the Scope window are disabled View data values ON OFF 3 ES Time Data Yalues Scope Time mec Values Ch 1 Values Ch 2 17 66750000 A466 OO00000000 4 733 0000000000 1 0833333 457 r OOOOO00000 38 30 0000000000 17 23155B5 3883 0000000000 3054 0000000000 1 580 2543 0000000000 2 31 000000000 1f6 77083333 1 450 0000000000 1172 0000000000 17 791 BBBB 331 0000000000 187 0000000000 17 81250000 FSO 0000000000 799 0000000000 17 83333333 1301 0000000000 1769 0000000000 2978 0000000000 2708 0000000000 177 6 600000 4002 0000000000 3604 0000000000 17 89593343 4958 0000000000 4436 0000000000 17 931666667 FeS0 0000000000 5190 000000000 15 337500 6598 0000000000 5856 0000000000 1 95833333 256 0000000000 6423 0000000000 17 991 666 fF 860000000000 6876 0
36. 9 Frequency domain plugins 4 Here the program will show the list of available frequency domain plugins Selecting one of them the program will open the corresponding plugin No frequency domain plugins are available in the above picture 9 Time domain plugins 5 Here the program will show the list of available time domain plugins Selecting one of them the program will open the corresponding plugin One time domain plugin is available in the picture above Sample Champion PRO 3 8 User Manual p 36 Settings General ett Geom wixer flint Bar 2 Settings General General Advanced FFT Compensation Calibration Hardware File Options C abit C 1 Mono f 16 bit 24 bit 1 2 Stereo 24 bit 2 C 1 Mana C 24 bit 1 f 2 Stereo 24 bit 2 Buffer Length 5 amples 4k Automatic Time Latency Calibration Info Single Measure Time msec 85 3 Audio Hardware Adjustments Sampling Rate Hz jas000 z Frequency Average Black Made Repeat g Complex Step fi Hote Power repeated cycles Average wait between cycles MLS Type Jak MLS Taps 12 11 10 2 Custom Sign Level z E Set Cane MLE on file MLS Spectrum FLAT see Compensation menu Load Save Default 9 The input recording and output playing PCM format can be set in this window 9 24 bit sampling Two modes have been implemented 24 bit 1 u
37. A Selections fom Geometry Land Save de NN Cancel Ok 9 In this window the user can set or edit some geometry parameters and Save them in an INI file 9 It is possible also to Load a set of parameters previously saved in a INI file The current version of the program uses only the information concerning Selection A and Selection B Sample Champion PRO 3 8 User Manual p 69 l ett Geom hier flint Bar MASTER CLITPLIT WASTER INPUT tine ee FFF X elie Lt wiluma Fight lL n m X tapez Rigi fw Lock L R eck WR va Qulput Viol H Synthesis Volume valuma Fight 0020 y Daughter Synth Vol z lock UR Peak Lett if hi Peak Figli E X X X i G INPUT SOURCE SELEZCTKIM beter and Sider Line Inpul val 8 Pc Ino vial 1t wou Lett Volume Fight HIS lock UR Peak Left n xwe ft i Peak gli m 00500008 9 The built in mixer is a general purpose mixer It tries to read all input and output sources and the available real time peak meters from the sound card driver Some hardware is not completely compatible with the internal mixer In these cases please use the standard Windows mixer or the mixer application provided by the audio card manufacturer See Tweaks function to find more information about selecting the mixer application
38. Channels INPUT OUTPUT format is selected When this option is enabled the soundcard Channel 2 INPUT must be connected directly to Channel 2 OUTPUT Loopback oee for more information There is some difference between averaging in time and frequency domain 9 Time domain Impulse Response data are averaged in the TIME DOMAIN Scope data are NEVER averaged 3 Frequency domain FFT from Impulse Response are NEVER averaged in the FREQUENCY DOMAIN because they are computed from data already averaged in the time domain FFT from Scope are averaged in the FREQUENCY DOMAIN 9 The Step value indicates the number of wait cycles after the actual record cycle Wait cycles are necessary to the program for performing all processing operations recovery of impulse response from MLS FFT of selected data and other user selected processing The program performs also a single wait block before the actual recording cycle to adjust some internal settings and allow to the acoustic system to reach a stationary state This single block is not counted in the Step value The signal generator is active during wait states in order to leave the acoustic system excited and maintain the synchronism with the sampler Adjust Record Wait Processing In the example in the picture above the value of Step is equal to 4 If for example Block 8 Step 4 Sample Champion PRO 3 8 User Manual p 39 then th
39. D and THD N can be computed using in two different ways If the option THD Mode is unchecked the following formulas are used JHI HH H p eh Se age 10 JA EH E ee pagel THS H H cva THD t 100 AHHH AHI RH v SHR MB HoT ME CC Whole Range f If the option THD Mode is checked the following formulas are used We bee TW an Hi oli JEITHITO xRH v a De EE ag gt x luti Hi In normal measurements with low THD and THD N the 2 methods will give quite identical results since more than 99 of the measured energy is always contained in the fundamental harmonic H1 Measurement procedure In the Custom Signal Window a single pure tone must be selected A SYNC REC PLAY 2 1 measurement cycle can be started Sample Champion PRO 3 8 User Manual p 98 Channel M THO 000234407 SNR 87 01 dB id THD N 0 01190 mD C REF D eren cee g Geo fo E W THO Mode 7 Manual jo a8 Cel E Iv view detailz C whole Range MF Harmonics THD and THD N will be computed and shown The View details window can show additional information Audio Quality Parameters computation details Tone Loopy 2 999 Hz b lUdbB rms Estimated Noise Floor 55 1 dB reo 84 1 dB in Freq Hz Harmonic Value dB 1995 2 f1 4 115 3012 3 f1 115 402 d f1 116 S010 b f 1 116 22 7 ane 6 f 1 4 114 703i
40. Response looks like in the above figure this means that the chain between input and output is interrupted Check the loop back connection and mixer settings The above plot can be obtained also by pressing the Rec button without any MLS signal in output it is due in this case to the cross correlation between the selected MLS signal Settings General MLS Type and uncorrelated background noise Most common problems Echo in the measured Impulse Response If the measured Impulse Response looks like the following Wrong Loop Back Impulse Response Sample Champion PRO 3 8 User Manual p 109 most probably the cause is a wrong mixer setting In the above example a repetition of the first correct peak can be easily observed In this case the Line In volume in the Play Control of the mixer had been erroneously enabled Play Contro xlix rd Fiy Donrel wink MIDI CD Pb Loree Mirophora PO Speake 0 peda Blanco B ancimner dacxsmuedn Buancienene B nncinnen x B vrar 89 Bdanckpnenho Bidasncianienio b F4e Fd p ki d E bie abit seks E E dd E j Don t ehable F giae T eatis Feet T this outputi TE Lee Ware Devin Wrong Mixer Setting In other audio devices there are other similar level settings that must be disabled to obtain correct measurements For example in the Pinnacle audio card mixer there is an Input Monitor control set it to zero and if pre
41. S 9 Asynchronous sampling mode this mode should not be used because all advantages deriving from synchronism between IN and OUT are lost When activated the sampling engine restarts at every new measurement cycle The average mode is disabled when this option is selected Asynchronous sampling mode should be used ONLY when loss of synchronism is experienced There is a loss of synchronism when the impulse response peak in repeat mode is not located at the same time position in every cycle see application notes Blinded Mode has been created to prevent any corruption of the sampled data caused by the influence of the graphic plotting especially on slow computers endowed with old video cards When this option is enabled during sampling all graphic windows are hidden and only a small text window is open Blinded mode should be used ONLY when a loss of synchronism is experienced There is a loss of synchronism when the impulse response peak in repeat mode is not located at the same time position in every cycle Sample Champion PRO 3 8 User Manual p 46 Settings FFT AMEE e 9 o BH 4 Settings FFT Settings General Advanced FFT Compensation Calibration Hardware File Options FFT Settings Size aK Weighting Window Blackman Harris Frequency Resolution 11 7188 Hz Upper Frequency Limit 24000 Hz Curent Sampling Rate 48000 Hz Hal left a
42. SERES 100 Eb Sine onn He 25 Eb Sine 19000 VERUS 100 Eb Sine 20000 SEU 100 Eb Square 1000 Es Ramp File v Select WAV file Sample Champion PRO 3 8 User Manual p 41 do When the sine wave signal type is selected the input and output buffers are set at 2 N samples in order to perform an exact FFT analysis coherent sampling feature When the square wave signal type is selected the generator will play a square signal with the selected frequency only during one half of the sampling interval This is done because the input and output lengths are one sample shorter than 2 N samples and it is not possible to generate a square wave of this length with the right harmonic content But this is not a problem when performing a measure with this signal just select an input buffer length 2 or 4 times longer than the FFT size See Apllication note 5 9 The Audio Hardware Adjustements button allows a fine tuning of the Audio Card Use this function ONLY if in repeated sequences of measurements the obtained impulse is moving Audio Hardware Adjustment MLS MONG MLS STEREO SINE MONO SINE STEREO Add Add Add Add fo See fo Sao Si ae fo x jo aie ft e i SES IO en fo 4 sme Joc sd se o e o af es 3 jesk o xj f x eek 0 sj a x Set page values to zem 4 Im r Load Save Close Connect the input to the output of the soundca
43. Save Spectra in RTA WINGOW ccccccseccseeteceteeeseeseeeeeeeeeeeeeeeeeteeeeeneeess 101 Troubleshooting Ea A E sr 102 ANS A E E E E E aan aac EA A A E HR 104 Most common problems and SOIUtIONS cccccccececeeeece cece cece eeseeeeeueeseeeseeeeseeeseeeeaes 107 Sample Champion PRO 3 8 User Manual p 3 Other features available in the plugins Audio Quality PIugilli otiose tia ono oto E cat uontor ho RUM UP NM Ts eR umU UMS 113 SNR Signal to Noise Ratio THD and THD N Total Harmonic distortion IMD Intermodulation Distortion FIferiBanks PIUgiliss iiec ne neces eee enc ee me rr ane res oe ene eee ster ae 113 BUTTERWORTH CHEBYSHEV low pass band pass and high pass analog filters IEC 1260 Octave and 1 3 Octave band filters Watertall Plot PIUQIN z int eens 114 3D Cumulative Spectral Decay ROOM ACOUSTICS PIU QIM ERR 115 Reverberation Time Early Decay Time Definition Clarity Centre Time Log Squared Plot Schroeder Plot Step Response Plot Cumulative Energy Plot Inverse Schroeder Integration rige View lUe serora E tees ueee ss 116 Energy Time Curve Spectrogram Nyquist Plot Phase Unwrapping Minimum and Excess Phase computation Minimum Phase Impulse Response Plot impedance UU Uses coaster ttc Emm 117 Loudspeaker impedance measurement Thiele Small parameters computation EE ol lt ctt RTT 118 License terms Sample Champion PRO 3 8 User Manual p 4
44. The following flow chart describes the input and output signal paths CROSS IMPULSE Pr CORRELATION gt RESPONSE gt gt SIGNAL SAMPLING _ Npa E 9 ft seuenAron E sis In the chart Acoustic System denotes the system under test for example a room or a loudspeaker 9 When the Measure Chain Equalization INPUT Correction option is enabled the content of all frequency domain banks FFT of a selection of scope or impulse response data are processed by performing the selected operation Multiply or Divide by the selected frequency domain file SPE This operation represented by OP1 in the flow chart is performed on complex numbers Note that both internal frequency domain banks and SPE files contain complex numbers and both positive and negative frequencies The number of samples of the selected frequency SPE file and the internal current FFT size must be the same Also the Sampling Frequency of the selected file and the current internal Sampling Frequency must be equal When the Microphone Compensation option is enabled the content of all frequency domain banks FFT of a selection of scope or impulse response data are processed by performing the compensation that has been selected NOTE only frequency domain banks are automatically compensated Time domain data Impulse Response can be manually compensated see Post Processing Sample Champion PRO 3 8 User Manual p 50
45. a Left channel and right channel FFT banks can be saved and loaded independently BAE IL ZR EXP Data of scope spectrum or functions can be exported as TXT files with options set in Settings File Options and the graph can be saved as BMP image THE AVERAGE IS COMPUTED ONLY IN COMPLEX MODE ONLY THE INTERNAL SIGNAL GENERATOR MUST BE USED IF THE YELLOW LABEL BUFFER OK ON THE REMOTE BAR IS NOT VISIBLE EVERY SAMPLING CYCLE THE STEP VALUE MUST BE INCREASED TO AVOID LOSS OF DATA Sample Champion PRO 3 8 User Manual p 101 Troubleshooting F A Q 1 Which is the accuracy of a measurement done with Sample Champion 2 Which sound cards are more suitable for Sample Champion 3 Why Sample Champion requires a lot of RAM memory 4 How can test whether Sample Champion will work perfectly with my PC configuration 5 In full duplex operations should I play at 8 16 or 24 bit the MLS signal 6 My SoundBlaster audio card refuses to perform full duplex operations 1 Which is the accuracy of a measurement done with Sample Champion The accuracy of a measurement not considering external devices like microphones amplifiers depends basically on the sound card You can evaluate the performance of your sound card using Sample Champion itself in a loop back configuration See application notes and FAQ 4 If your sound card has a poor frequency response some improvements could be obtained using MLS
46. a LOUDSPEAKER connected to the output of the sound card using a power amplifier if necessary Alternately a short jack jack cable or as required by the sound card could connect direcly the LINE OUTPUT of the sound card with its LINE INPUT loop back Now we are ready to start some measures Start Sample Champion Open the settings window and set the following parameters General Settings INPUT Mono 4K OUTPUT 16 bit Mono Disable Automatic Time Latency Calibration Sampling rate 48000 Hz Block 1 Mode Repeat Step 2 MLS Type 4K MLS Taps 12 7 4 3 Level 50 Sample Champion PRO 3 8 User Manual p 8 Advanced Settings Uncheck everything Check only Remove offset from sampled data FFT Settings FFT Size 4K Weighting window Blackman Harris Half right Check Show window Uncheck Phase shifting Check Transfer Function Measurement Write a voltage value in the Signal Amplitude field for example 1000 or 2000 milliVolt Select Channel 1 L for all three cursor selection channel assignements Compensation Settings Uncheck INPUT Correction Enable checkbox Uncheck OUTPUT Correction Enable checkbox Uncheck Pink Filter checkbox Calibration Settings Uncheck Manual or Automativ Latency Calibration Do not change Amplitude calibration Open an Impulse Response window press Press and select Selection A in the Impulse Response
47. active window is an Impulse Response Window RE Impulse Response native format 80 bit floating point WAV PCM 16 and 32 bit integer and IEEE 32 and 64 bit floating point TIM MLSSA data TXT ASCII raw exported data 9 If the active window is a Scope Window WAV PCM 16 and 32 bit integer and IEEE 32 and 64 bit floating point TIM MLSSA data TXT ASCII raw exported data If the active window is a Frequency Domain Window SPE Spectral data Real Imaginary parts native format 80 bit floating point FRD Frequency Response ASCII format TXT ASCII raw exported data 9 If the active window is a Frequency Domain Plugin SPE Spectral data Real Imaginary parts native format 80 bit floating point FRD Frequency Response ASCII format TXT ASCII raw exported data Sample Champion PRO 3 8 User Manual p 14 Most Recently Used files are added in the bottom of the File menu If the Show Open Dialog option at the end of File menu is checked the open dialog is shown when a file in the MRU list is selected otherwise the file is opened The WAV format type can be selected in the Save window Set curent directory as Defauk te Mew Dir Mew diego Impulse Response 1 ire Save Cancel Floating Port Impulse Response 516 Floating Paint Impulse Response Fin MLSSA Time Doman Data tim Windows POM integer WAY 16 bi File wav w indows PCM integer WAY 32 bi F
48. age is written otherwise the result is OK fr mm Control Upper amp ound Spectium File C SC d5 Data UpperOC spe B Lowerr Bound Spectrum Fie CA SC d5 Gata Lower OC spe t Frequency H ange From 50 ta 20000 Sy Hz Sample Champion PRO 3 8 User Manual p 32 Powe d G5 200 300 400 zk sk ddk 6k Sk 10k Load Example_QC spe and set Upper_QC spe and Lower_QC spe included in the setup package Data directory to see an example Show frequency data types ID 20 2 FFT of a selection from scope data 4 FFT of selection A from IR data 6 FFT of selection B from IR data other frequency data from plugins each plugin has his own ID type 9 General notes about frequency data computation The computed frequency data depend on to current FFT settings FFT size weighting window cursor selection phase shift and transfer function measurement see The phase shift option is always enabled for averaged FFT of scope data WARNING the spectral data are recomputed EVERY TIME that the refresh button or the F5 key is pressed In the following cases special attention must be paid 1 loading spectral data of the same type of a currently plotted computed data 2 analyzing frequency domain data from a scope selection after an average measurement cycle 1 For instance if Sample Champion PRO 3 8 User Manual p 33 the impulse response window is open and selection A on t
49. also the results of a computation performed by a plugin working in the frequency domain Frequency Domain Window Features 9 View Options 1 This function opens the View Options dialog in order to select the view mode The values shown on the Y scale depend also on the calibration settings see Window The drawing mode option specifies whether the data are plotted as points connected with a line or every data value is plotted as an horizontal bar The Bar mode is much faster and should be used when the CPU is overloaded View Options 1 AMIS C Linear C Octave 4 Octave e 1 3 Octave fla VE Y AMIS Magnitude C Phase 180 C Real Part C Imaginary Part Y Scale C Module Lin C Power Lin Power dB Cancel Drawing Mad Plot Label Default C Y axis C Custom k Untitled l Sample Champion PRO 3 8 User Manual p 27 The label of frequency plots can be customized allowing to the user the personalization of the title label of the frequency plot adapting it to the kind of data analyzed and to current settings 9 View frequency data values ON OFF 2 This window shows the values of the currently plotted data The frequency step depends obviously on the current FFT size see Settings FFT Window ER Frequency Values Mag Mod Power dB m x Values 2713095855 70 14 685 23 578r r62010 22 28
50. ampion PRO 3 8 User Manual p 102 3 Why Sample Champion requires a lot of RAM memory This is a consequence of the very high accuracy used for all internal operations For example the FFT limited for the user to 64K but extended for some internal operations to 256K is computed on double precision complex data and using both frequency bands positive and negative frequencies to perform some specific signal processing operations and in prevision of any future DSP expansion using special purpose plugins To prevent any resizing or reallocating of the virtual memory during measurements Sample Champion allocates once started all RAM memory required for working 4 How can test whether Sample Champion works perfectly with my PC configuration First of al download the full working trial version and install it The main test to be performed is whether your computer is fast enough to perform the real time operations required by Sample Champion and nothing in the system interferes with the input and output audio streams The test 9 Connect in loop back the input and output of your sound card 9 Start Sample Champion and open the Impulse Response and Info windows 9 Set a sampling frequency of 44100 Hz and the Repeat mode 9 Start a Sync Rec amp Play loop of 4096 cycles and read the peak position of each cycle in the info window 9 Adjust if necessary the in and out levels from the mixer to obtaind a distorsion free impulse
51. and instructions about using the plugin can be found in the Application Note 9 Waterfall Plot Plugin Fc Cumulative Spectral Decay Plot sud Ik ak p Ax Ek k Tk dk Uk TUE Hz This module computes and plots see the above figure a 3D Cumulative Spectral Decay of an impulse response This is an invaluable information for finding loudspeaker and box resonances Many options are available such as different FFT sizes and weighting windows independently from the main program settings Unreliable computed low frequencies are automatically rejected from the plot More information and instructions about using the plugin can be found in the Application Note 10 Sample Champion PRO 3 8 User Manual p 114 Room Acoustics Plugin Iz Hoon Acoustica la i pei F Plat fal ALF 60 ee fe ee dete Tes dr ea es TITEL p 238 LESE TZ Ln IEEE DEAS n Led ZO 4000 E ue IE O7 I Ter Eid ail 11 XXI Ss E IE ALIS EL 2113J oie lr 101 IZ a IEA x Alu rio EEEGCNE ED Ub DE ANNE ro eel SIT LIE ERES Pis j ols zlota 201 18 NEM Eb TES ET T 23123 rhs ot es ME E j tnae Lig Too E a ae Range EF E aa ja FF Sho Fog Pe Do Charved Ez TCI 7 mi ing ce Poet ETE im y m nen Corp Show Un jo ajaran cuj Aniak Bag i ATcemicom Mk EDT a Cey gmax RI Gagn mp sees ej sie mj PS sl Foal P si v thd 2 zi Lm 3327 Poeni This module computes and plots ma
52. e Measuring and Analyzing Impulse Response Data button the following short Step by Step Guide will be shown Sample Champion PRO 3 8 User Manual p 23 Measuring and Analyzing an Impulse Response Open the Impulse Response window Set appropriate measuring options start the measurement SYNC Rec and Play f pen Selection in Impulse Response frequency analysis window j Select a portion of Impulse Response data for frequency analysis Selection Procedure 1 click this Button to start the time data selection procedure 2 press left mouse button inside time data window and move the mouse 3 release left mouse button when data are selected 4 click this button again for changing the current selection 5 Em click this button ta move the selection b click this Button to select ALL time data 7 e click this button to cancel the selection Press F5 to refresh Disable Y amp utascale option ril in the Frequency Window Now a measurement cycle can be performed Repeat or Average After the data windowing selection the shortcuts 12 Quick Spectrum E9 can be pressed to compute and plot the FFT of the selected data A shortcut for Selection A and one for Selection B are available Button 13 creates selection B with the same size as selection A starting at the end of selection A MOVE the view point to localize the maximum peak 14 This function can be used for movi
53. e complete cycle of measures repeated or averaged requires 8 1 1 4 48 recording cycles each one containing Buffer Length samples This value can be changed also in the 9 From the MLS Type list it is possible to select the length and type of the MLS stimulus or other signals d Note that when MLS length and Buffer length are not equal the program will show a red alert message inside the Impulse Response window To achieve the correct impulse response recovery MLS LENGTH AND INPUT LENGTH MUST BE THE SAME Under the MLS Type menu the program shows the current MLS spectrum status see 9 A custom WAV file can be used as MLS signal It is possible in this way to pre filter the MLS signal itself This could be useful for example when performing measurements on tweeters or woofers 1709 amc mgr perm gs D E O e S Rl Fog og a pi j Bamm unma cw pz cx Set Cane L SC do Data Filtered HLS 4E Taps 12 11 1D 2 wav MLS on file am el i An MLS signal generated by Sample Champion can be saved Menu File filtered by means of an external software and set as custom MLS Tip The MLS signal can be filtered by means of the Filter Banks Plugin that works only on Impulse Responses by using the following procedure 1 Save the current generated MLS signal Menu File as a WAV file 2 Set in Settings File Options dialog Load WAV file as Impulse Response 3 Load the WAV file now considered as an Impulse
54. e optionally applied 9 Frequency Data Exporting Options oome options for exporting Fequency Data as ASCII file type of exported data separator characters spaces between values can be selected here Sample Champion PRO 3 8 User Manual p 66 Impulse Response and Scope Data Exporting Options Some options for exporting Impulse and Scope Response Data can be selected here The Simple Form exporting option enables the simplest format of the exported Impulse Response and Scope Data ASCII TXT Impulse Response files measured by using other software can be also imported Only single channel Data are accepted The format of the imported files is the following Row nr 1 gt Title Text Ignored Row nr 2 DeltaT ms Row nr 3 Number of Data N Row nr 4 gt Data nr 1 Row nr 5 gt Data nr 2 Row nr 6 Last Row Data nr N Example 4096 data Fs 48kHz My Impulse Response 0 0208333 This is DeltaT ms DeltaT21000 Sampling Frequency 4096 This is the number of the following Data 0 00114076 This is the Data nr 1 0 00135692 This is the Data nr 2 The above format is similar to the format of the files exported by the MLSSA system IR and Scope Data are exported by Sample Champion in this format when the Simple Form option is enabled Sample Champion PRO 3 8 User Manual p 67 Quick Settings Quick Settings EX Weighting Window Blac
55. e useful for compensating some soundcards behavior or for specific measurements requirements A ERROR PREVENTION OPTIONS Halt measurement if CPU Overload option stops the program when the CPU load is excessive CPU OVERLOAD Current measurement corrupted and halted Please increase Step value in General Settings window IF the error remains try to increagze Buffer length decrease FFT size if FFT i used decrease Sampling Hate avoid changing Selections and other controls inside Data windows during measures If CPU Overload is detected try to increase Step value in General Settings window If the error remains try to increase Buffer length decrease FFT size if FFT is used decrease Sampling Rate avoid changing Selections and other controls inside Data windows during measures 9 Warnings beeps and Halt measurement if application loses focus options prevent the user switching to applications that could break or corrupt the normal sampling data flow Halt measurement if wrong data buffer is detected option stops the measurement Sample Champion PRO 3 8 User Manual p 45 when the difference in samples between IN and OUT buffers is greater than the indicated value This option works only if the audio card has a very low latency time and must be used carefully Should the use of this option cause some false alarms don t worry and disable it SAMPLING MODE OPTION
56. ee bees r Amplitude Calibration Input amp F 5 Input Level Scope Value Spectrum Value LEFT 425 lt zr gt 34 cot 50118 f2 mPascals Peak lt gt 54 OO SPL Peak idb RIGHT 24 06 lt gt 34 gt 50118 72 mPascals Peak lt gt g4 D SPL Peak dB Level Freq Graph Labels C olte Lin mPascals Peak f SPL dB Log SPL Peak dB Calibrate INTERNAL source level Fal Open Miser L Calibrate EXTERNAL source level Gol Manual Amplitude L aipration sFL Peak LEFT Peak SPL dB RIGHT Peak SPL agn Scope data infa 32767 gt 0 22767 lt gt 0 SET Load Save Defaut Cancel Different calibration types are available Latency Time Fixed and Automatic and Amplitude Calibration Real time and Manual 9 Latency Time Calibration it is the delay due to soundcard hardware and drivers and operating system between input and output buffers it depends on the specific audio card that is used The effect of this delay is a left or right shifting of the Impulse Response peak ideally placed at t O for a loopback mesurement Sample Champion allows 2 ways to compensate the soundcard latency FIXED and AUTOMATIC DYNAMIC recommended Sample Champion PRO 3 8 User Manual p 56 NOTE the FIXED calibration can be used when the soundcard presents always the same latency delay every time that a measurement is started SYNC REC PLAY A soundcard has fixed latency if t
57. erform some DSP functions on them The RTA functions display can be opened by pressing the button placed on the remote bar imm n order to operate properly the RTA window requires that Number of input channels 2 INPUT BUFFER LENGTH FFT LENGTH For example for a buffer of 16K samples the settings are the following Sample Champion PRO 3 8 User Manual p 86 General Advanced FFT Compensation Calibration Hardware File Options OUTPUT Bil 3 ample Channels Bbi 4 Meno f 16 bi z amm d ER r 24 biti2 Audio Hardware Adusiments sampling Rate Hz 18000 l Slep 4 Hael watt baiunan c eyelas Block 1024 hoge Hepest a C Average TT Fraquency Average B Comptes or E Custom Sign Level amp 40 zj MOHL on file MUS Spectrum ELAT eee Conipeeston menu Suellings General Advanced FFT Compensation Calibration Harcware File Options Weighting windo Blackman Hanis Frequency Riesokion 2 9297 Hz Peedi UE Upper Frequency Limit 24000 Hz C Ful Current Sampling Habe 48000 Hz ping Hel Halet v Show weghting Window over Selechan m vopna Halfsight Phase Shitting t 0 at selechon begn Window Shape Transfer Function Measurement Signal Amplluda aon i my ok gt Curso selection channel assigeemente AIR A Sel Channet fm lL C 218
58. f windows bar is empty only the clock is shown Sample Champion PRO 3 8 User Manual p 5 General Overview Sample Champion can operate in real time while performing a measurement or in post processing mode at the end of a measurement cycle or with loaded files There are no differences between these operating modes Basically there are different types of windows each with different contents and behaviors Time domain windows Scope windows Impulse Response windows Frequency domain windows FFT of Selection in scope window FFT of Selection A in impulse response window FFT of Selection B in impulse response window Plugin windows Frequency domain plugins Time domain plugins All frequency domain and plugin windows have a specifical ID type shown in the lower right hand corner of frequency windows to distinguish them This ID is written also inside the SPE frequency files Sample Champion uses some memory banks to store Time and Frequency data To reduce RAM memory requirements only one memory bank of each type is used at the same time For example the user can view simultaneously 1 Scope memory bank 1 Impulse Response memory bank 1 FFT of scope selection memory bank 1 FFT of impulse response selection A memory bank 1 FFT of impulse response selection B memory bank 1 Frequency domain plugin memory bank Sample Champion PRO 3 8 User Manual p 6 For each memory bank it is poss
59. factors soundcard hardware and drivers operating system etc will be automatically compensated It can be enabled in the Settings General window Gene Advanced FFT Compensation Calibration Hardware File Options INPUT OUTPUT r Bit amp ample Chand Bi Sample Channels cbr tC 3 Mono C A e1 Mora iv 16 bit 1 24 bt 1 i 2 Steen C em f 2 Stereo Cosa bt 2 Cabal BufferLength Samples 4k Single Measure Time mzeck 853 Audio Harduate Adjustments Sampling Rate Hz 48000 E r Frequenew Peerage Block 256 7 Mode Repeat e mes Step fi v Ne frepeatod apalie Fr Aver verage Poma mak befuuun cytes MLS Type aK MLS Taps 12 7 4 3 Custom Sign Levels 40 zl Set Canc MLS on fle MLS Spectrum FLAT see Compensalion menu Load Save Default Cancel OK tod see tence ok or in the Settings Calibration window Sample Champion PRO 3 8 User Manual p 58 Latency Time Calibration Auto detect Fired Latency Time Connect OUT to IN Enable Latency Time Calibration Fised Test Sample Rate LR Wrapping samnles Detect Now Efe f Current Default o wn 44100 Hz 2 _ Enable Automatic Time Latency Calibration Dynamic Den en ee ena s UST be always connected in LOOPBACK Amplitude Catra Input X F 5 Input Level Scope Value Spectrum Value LEFT 24 25 pus 94 lt g
60. formed with an unfiltered MLS signal Here is a pink filtering example This is a simple loop back measurement and gives a flat power spectrum when its frequency content is analyzed in narrow band But when an 1 3 octave frequency analysis is required the graph will look like the following In the above plot the effect of 1 3 octave band analysis is correctly shown every subsequent band is about 1 dB greater than the previous one 3 dB in 1 1 octave analysis By applying pink filtering to the Impulse Response the result will look as follows Sample Champion PRO 3 8 User Manual p 84 Now the 1 3 octave plot will look as follows where every band has the same amplitude See also Application note 6 about Pink Filtering 3 Clear all Data Buffers This function clears all data buffers Time and Frequency of the software Sample Champion PRO 3 8 User Manual p 85 RTA Real Time Analysis EL Signal amp nalpzx Functone PES aa aefa ee MDAT FER Taree Scale E 3 Fut Som ee Cm T EHE Sgen wi LET Baza SSS agi nid wu ur Ae TURELJGED pert non wen Eda Bao w wH rz Ae PS el pal nerika BER x ari y al BADE H momo aa H RAD g an LENT M Io nne anm fno ina P Ve Auto ay Sacto T Css m In Sample Champion is possible to analyze simultaneously in real time the 2 oscilloscope input channels and p
61. found that W2K does not inform the audio software of the correct maximal sampling frequency allowable for a specific sound card The consequence is that when a sampling frequency not allowable is selected the system could hang in this case try stopping the non responding application with Task Manager This affects all audio software and not only Sample Champion Solution see your sound card manual to learn the maximal allowable sampling frequency Another minor problem we found concerns the audio mixer of W2000 for some audio devices the Enable Disable checkboxes are inverted Solution with Sample Champion make some test measurements and check the input level meters to see if the signal IN OUT are correctly selected 9 Troubles have been noticed during the concomitant execution of Sample Champion and other programs when a reduced disk space less than about 100 MB is available This Sample Champion PRO 3 8 User Manual p 105 happens because Windows creates a swap file Win386 swp usually located inside the Windows directory for emulating the RAM memory required by specific programs when not present as RAM The disk space required by Sample Champion when all RAM memory is used by other software is about 70 MB or more depending on settings and opened plugins If this amount of free disk space is not available Sample Champion will not work properly and will terminate with unexpected errors The symptoms are error
62. ge examples Main program MUST be open and ready to start C RemoteD rectors A emotes C c sdataMilename way wav C RemoteD rectors Remates C c sdatasMilename tet xt 9 Sample Champion can now be triggered by means of a command line from a DOS window or an external program A small utility called RemoteSC is included in the setup package This utility can be called from a command line or from any external program It allows to start a measurement and save automatically the measured Impulse Response as TXT or WAV files BEFORE using this utility Start and leave open Sample Champion that must be ready to start a measurement Usage example C RemoteDirectory gt RemoteSC c data filename wav wav Starts a measurement cycle and saves the measured Impulse Response as a WAV file C RemoteDirectory gt RemoteSC c datal filename txt txt Starts a measurement cycle and saves the measured Impulse Response as a TXT file From the website it is possible to download an example which includes the Delphi 5 source code for calling RemoteSC from a custom program Sample Champion PRO 3 8 User Manual p 77 Post Processing Functions Processing Window Help Invert LR Reverse LR Mormalize I R Peak to 1 Find and subtract ILR Offset Wrap LR d Move Impulse Response Peak at d Move Impulse Response Peak at 100 at Measurement Cycle End Increase FFT Spectrumis Magnitude 1d6 Increase FFT Spectrumis Magnitude 5d6
63. gestions for solving this problem Error min U max 18203845 4834383 The operation leads to an overflow of 124 The result may lead to distorsior Please reduce MLS Level xX POSSIBLE OVERFLOW ERROR in Pink filtering Note 1 filtering is performed working with complex numbers and the result is converted to long integers only at the end of the process Note 2 the min and max values written in the alert window depend also on the current calibration Sample Champion PRO 3 8 User Manual p 54 9 The Free Field Reference Impulse Response selection allows the selection of a IRE file that can be plotted overlapped in the Impulse Response Window This feature could also be used by future developments of the program or by specific plugins The Impulse Response in the file must use the same Sampling Frequency inserted in the current program settings SThe Default Dir button allows the selection of a default directory for file operations Sample Champion PRO 3 8 User Manual p 55 Settings Calibration GEDER M E e E Settings Calibration General Advanced FFT Compensation Calibration Hardware File Options Latency Time Calibratio EOP Auto detect Fixed Latency Time Connect OUT to IN Enable Latency Time Calibration Fixed Test Sample Rate LA wrapping 1370 samples Detect Howl 313 guis Enable Automatic Time Latency Calibration Dynamic ae ae pue n
64. he impulse data is active and the frequency domain window of selection A is open then WHEN A FILE CONTAINING FREQUENCY DATA FROM SELECTION A IS OPENED THE LOADED DATA WILL REPLACE THE COMPUTED DATA UNTIL A REFRESH IS PERFORMED This is true for every file type 2 For instance if the scope window is open and selection on the scope data is active and the average mode is active and a measure cycle has been performed number of blocks greater than 1 and the frequency domain window of the scope selection is open then THE FREQUENCY DATA PLOTTED WHEN THE MEASUREMENT CYCLE IS COMPLETED ARE THE DATA AVERAGED IN THE FREQUENCY DOMAIN UNTIL A REFRESH IS PERFORMED WHEN A REFRESH IS PERFORMED AND THE SELECTION IS ACTIVE THE PLOTTED DATA WILL BE REPLACED WITH FREQUENCY DATA COMPUTED FROM THE LAST SAMPLED SCOPE DATA THE CURRENTLY PLOTTED DATA When the Octave mode is selected the value of each band is shown above the band if enough space is available this can be obtained by enlarging or maximizing the window E Selection A in Impulse Response Window 2 Bett Gn s Of Gn ES Sample Champion PRO 3 8 User Manual p 34 Measurement Type Selection pen Save Scope Imp leas c m aas e e o 5 Qo Measurement type selection 9 Pressing this button the measurement type selection window will open Here it is possible to select which type of analysis measurement must
65. he peak of a measured loopback impulse response is placed always at the same time position in different measurements ume f in different measurements the peak of a measured loopback impulse response is placed at different time positions the DYNAMIC latency calibration option must be used In this last case the measurement must be stereo and the channel 2 must be in loopback soundcard output channel 2 connected to soundcard input channel 2 9 Generally the DYNAMIC latency calibration option is preferred when external soundcards USB or Firewire are used LATENCY TIME CALIBRATION PROCEDURE FIXED Automatic procedure press the Detect Now button and the Go Button The delay is measured and set automatically Note that the INPUT of the audio card must be directly connected to its OUTPUT and the levels must be correctly set see the manual procedure below for more details Some audio cards are not compatible with the automatic procedure In this case the manual procedure can be used Manual procedure Connect the INPUT of the audio card directly to its OUTPUT loop back Open the Impulse Response Window Open the Settings Window and set for example the following parameters n and Out 16 bit Mono Buffer Length 4K Block 1 Mode Repeat Sampling Rate 44100 Hz Step 2 MLS 4K 12 11 10 2 Uncheck any Output Correction Press Syncro Start Stop and perform a measurement Sample Champion PRO 3
66. he plot view range 15 SHOW extra information about the impulse on the plot area 16 OVERLAY the Free Field impulse response if selected 17 PLOT Left and or Right channel data if the measurement is stereo 18 CLEAR set to 0 impulse response data between Selection A cursors 19 CLEAR set to 0 ALL impulse response data 20 SET plot starting point 21 ZOOM time scale 22 ZOOM amplitude this affects only the plot 9 Pressing the impulse response button an empty window will open When one or more measurements are performed the Impulse Responses computed from the sampled data are plotted here at the end of every cycle 9 If the Average option is enabled the plot is updated at every measurement cycle with the partial result of the average operation Impulse Response Window Features Functions 1 to 6 are quite similar to those described for Scope window 9 Data Selection A and B 7 8 9 10 11 12 13 These buttons can be used for selecting and analyzing Impulse Response Data Two data selections are available called A and B The frequency contents of the data selected in these selections can be viewed separately and independently Buttons 7 can be used for manual selection of data to be analyzed in Impulse Response window as described for Scope window Click the menu Help Quick Help to see a step by step guide for analyzing Impulse Response Data Inside the Quick Help window by selecting th
67. ia Times di sistema Tastiere standard 102 102 tas a Tasbera Firosoft Netural PS z Perle d comunicare COME Porta di comunicazione COML Conroe cisco floppy chandard Orologio dk sistema CIMOS a tempo reag istema compatibles Oc Pl ercoaft Hausa compalibie P3rz Conmerssere mabemabeoo Cana pnmearia ILE Cana secondaria IDE Som Aindows Modem PCL abl Adantec C5 Card 29160 Literae SCST Comrolier universa hast YA USS Controller universal hask v LIS8 mas A PCT 11 Creative SB Live WDM Mi PCT 11 Matrox Marvel G200 AGP TE system configuration IRQ resources As shown above IRQ 11 is shared between Modem SCSI adapter USB adapters audio card and video card By the way IRQs 2 5 7 and 10 are free The solution is to assign to the audio device one of the free IRQs Sometimes uninstalling and reinstalling the device could be necessary but it will be surely worth The figures that follow show in detail the settings of the audio and of the video cards Proprieta Creative SB Live WDM 2 xi Generale Proprieta Driver Risorse Qe Impostazione risorse Creative SB Live WDM Tipo risorsa Impostazioni Intervallo di input output DCOD DC1F li Livello di interrupt 11 Impostazione basata su Configurazione corrente v Usaimpostaz autom Cambia impostazione Elenco periferiche in conflitto Annulla Audio Card IRQ setting Sample Champion PRO 3 8 U
68. ible to open as many view windows as desired For example the user can open simultaneously two impulse response windows showing different time intervals or with different time scales X axis zoom The data of the same frequency bank can be plotted in different windows with different Y axis view options such as Magnitude linear Magnitude dB third band of octave phase You can find some examples in the Quick Starting Guide System Requirements Hardware Standard PC Pentium or later or compatible processor Pentium Il ZOOMHz or faster or equivalent compatible processor recommended 64 MB RAM recommended 128 MB or more Fast video card recommended settings 64K colors or greater 800x600 or greater screen size Windows compatible full duplex 16 or 24 bit sound card 10 MB Hard Disk space at least 200 MB Hard Disk free for Windows swap file Software Microsoft Windows 95 98 ME 2000 or XP Full duplex sound card drivers supplied by sound card manufacturer Only standard MMSYSTEM support is required MME WDM drivers DirectX or ASIO support is not required Sample Champion PRO 3 8 User Manual p 7 Quick Starting Guide Here you ll find a step by step procedure to start using Sample Champion It is assumed that a full duplex sound card is installed and working In order to make some tests it could be a good idea to have a MICROPHONE connected to the MIC IN of the sound card placed in front of
69. ile ever Windows IEEE float WAW 32 bit File wav windows IEEE fio WAY 54 bi File vrav MT Aoi Data dd mn Some additional options must be taken in account when data are saved as WAV files Settings File Options umm See also Settings File Options Sample Champion PRO 3 8 User Manual p 15 Scope Window pen Save Scope Imp leas ETT Tun ss n 5 6 G 9 I Scope EE Scope 1 kHz LAO Set t a tirer co uA AE 9 10711 12 p LM ruraux uu I G a a M a U M M UMa mPascals Peak 49 3 2 Time ms 2 RC UNUM M ees eS AutoScale ON OFF Set View Time Interval Lock Unlock View data values Export time data as XLS Excel file Save snapshot of the data window as bitmap image Print the data window Set custom colors ooh N l Data Selection for frequency analysis 7 Manual Data windowing and additional information 8 START selection if no data are selected or CHANGE selection size if some data are selected moving the selection cursor nearest to the mouse pointer 9 MOVE selection 10 EXTEND selection to the current maximum input length or maximum FFT size 11 DISABLE selection 12 Quick Spectrum 13 SET plot starting point 14 Overlay generated Signal 15 PLOT Left and or Right channel data if the measurement is stereo 16 ZOOM time scale 17 ZOOM amplitude only view Sample Champion PRO 3
70. ing the Noise Floor WITHOUT the harmonics due to distortion it is for instance possible to select the band 100 800 Hz when a 1 kHz tone is used as signal generator 2 manual this option allows to set manually the Noise Floor value It can be measured for example recording the background noise in absence of input signals 3 computation of the Noise Floor level as logarithmic sum of narrow band power levels on the whole bandwidth from 20 to 20000 Hz Sample Champion PRO 3 8 User Manual p 96 Channel M THD 6 00234 V SNR 87 01 dB j 1 D THON 6 001190 MD C 2 R i NOS E Manual dB Su Whole Range NF 4 Harmonics E Show Est Floor M THD Made Rel IY view details A yellow line corresponding to the Noise Floor level and a blue line under the frequency range selected by the user for the computation can be optionally visualized on the plot 200 500 40500 B rene T If the pure tone used for the measure falls inside the frequency range selected by the user it is automatically excluded from the computation The Noise Floor value used for THD N computation is not influenced by this option and is computed on the whole bandwidth all harmonics generated by the 2 pure tones are also automatically excluded IMD computation is not influenced by this option Sample Champion PRO 3 8 User Manual p 97 9 THD Total Harmonic Distortion measurement maa TH
71. instructions about using this plugin can be found in the Application Note 16 Sample Champion PRO 3 8 User Manual p 117 License SAMPLE CHAMPION FOR WINDOWS 95 98 2000 ME XP Copyright c 1995 2005 by Paolo Guidorzi All rights reserved END USER LICENSE AGREEMENT This End User License Agreement is a legal agreement between you either an individual or a single entity and Paolo Guidorzi for the Sample Champion SOFTWARE product identified below which includes computer software online or electronic documentation and may include associated media and printed materials Please read the following terms and conditions carefully before using this SOFTWARE Your use of this SOFTWARE indicates your acceptance of this license agreement and warranty NOTICE This SOFTWARE is protected by copyright laws and international copyright treaties as well as other intellectual property laws and treaties This SOFTWARE product is licensed not sold The SOFTWARE is not public domain software nor is it free software Sample Champion is copyrighted by Paolo Guidorzi Unauthorized reproduction or distribution of this SOFTWARE or any portion of it may result in severe civil and criminal penalties and violators will be prosecuted to the maximum extent possible under law REGISTERED VERSION One REGISTERED copy of this SOFTWARE may either be used by a single person who uses the SOFTWARE personally on one or more computers or installed
72. ion can be used for setting to O all data in the memory bank 9 Plot Zoom 20 21 22 Sliders 20 21 22 can be used for zooming X e Y axis of the plot Y Zoom 22 is very useful to check negligible signals Sample Champion PRO 3 8 User Manual p 25 Frequency Domain Window pen Save Scope Imp leas lamas Ei Selection A in Impulse Response Window 2 Areni LU dH eis F amp F oc ts 1 2 3 4 5 6 f 8 39 10 11 12 13 14 15 Zoom Scale 17 g 16 200 E 400 zl 3k k T En 18 1k Frequency Hz View Options View frequency data values ON OFF Save snapshot of the data window as bitmap image Print the data window Set custom colors Y Autoscale on current data Y Autoscale ON OFF Round dB Y scale ON OFF X Zoom out full display all the measurement frequency band Set view frequency range ON OFF Set logarithmic Y range ON OFF IFT Inverse Fourier Transform Sample Champion PRO 3 8 User Manual p 26 13 Edit Frequency Data 14 Frequency Data Overlay 15 Quality Control 16 Frequency zoom This slider changes the maximum frequency value on the plot 17 Setthe amplitude zoom plotting value 18 Set bottom plotting value 19 Setthe starting frequency value in the plot 20 Show frequency data types ID 9 This window shows frequency domain data computed from a selection in the scope window or in the Impulse Response window lt can display
73. ion is ON and the Y is in dB scale only integer values are shown This applies only to the plot data are untouched 9 X Zoom out full 9 When this button is pressed all the measurement frequencies are plotted 9 Set view frequency range ON OFF 10 Set Frequency H ange fio to 48000 Hz Min 10 Hz Show 11 12 19 Hz Frequencies Markers Show 60 70 90 Hz Frequencies Markers Show 120 140 180 Hz Frequencies Markers Show 600 700 900 Hz Frequencies Markers This function allows to set accurately the graph frequency range When it is enabled the scroll bars in the Frequency window are disabled Optional frequency markers in the low frequency range can be activated by the user Sample Champion PRO 3 8 User Manual p 29 Set logarithmic Y range ON OFF 11 Logarithmic Plot custom settings Y dB diy 5 zi Set constant Top Set constant Bottom Ok This function allows to set accurately the graph frequency range When it is enabled the scroll bars in the Frequency window are disabled Some options about frequency markers can be set too Also a custom dB div value can be set Example set the desired Top Y value in dB set the desired dB div value in dB and press the Set constant Top button press Refresh Now the frequency plot is updated with the set Y scale values Logarithmic Plot custom settings Top m dB Bottom 50 2 dB ns il Set constant
74. k also that the output peak level meter if available does not indicate any saturation and that the indicated values are reasonable Write in the Input Level fields the desired values for left or mono and right channels Select also all other options Peak RMS as desired Press the Go button and wait the ENDED status of the sampling engine The Scope Value and Spectrum Value fields should be now filled by the program with the requested values From now on all measured values will be calibrated according to these values 9 CALIBRATION USING AN EXTERNAL SOURCE Open the Settings Calibration window Place on the microphone an external calibrator and turn it on Press the calibration using an EXTERNAL source button to start the procedure Open the mixer by pressing the Open Mixer button check by means of the input peak level meter if available the absence of any saturation and that the indicated values are reasonable for example 6 dB for both channels Write in the Input Level fields the desired values for left or mono and right channels Select also all other options Peak RMS as desired Press the Go button and wait the ENDED status of the sampling engine The Scope Value and Spectrum Value fields should be now filled by the program with the requested values From now on all measured values will be calibrated according to these values Sample Champion PRO 3 8 User Manual p 61 Examples of
75. kman Harris r Sampling Block f Repeat Average Step f Frequency Average Complex ot E Power Cursor s lection channel assignements Scope Sel Channel IR A Sel Channel IR B Sel Channel 1 Ui ORE amp io 7 2 R 2 R f Half lett Half right Cancel _ Apply and Close _ Apply and Close Close 9 This window can be opened by clicking the Menu Options Quick Settings item or the button on the control bar When plugins are activated the Settings can no longer be changed Using this function however some of the settings can be changed also in this Case Control XI About Sampling Settings Fe Hz 48000 Hz Bit Sample 16 Channels 2 m Rutter Status s TA Tot 46 35 3 ans Sampling Engine SUIS gl Settings Enhanced dew Filter Banks Impedance T S FFT Scope FFT Selection A FFT Selection B Sample Champion PRO 3 8 User Manual p 68 Measurement Setup ett beam Mixer flint Bar Measurement Setup HMearurement Setup Baa M mc c Ay B L 12 E Hasuremant lupe IR Selectors 7 fur Tempersbune Gere mpm nm OE 32 ggg 5 m UE Amem 4200 EE Nj EH lp Reflection I AF loan 95 T 5 Sound Spe 2 mt ec eure E1007 a imer eomm ee DIE EI ur ical RES A 5 a Charachsnishc imped 213 41 ral Suface Foshan lt 5 Teri qn Drona IL fern lh Leudspesker Mic Angle Th O00 Set
76. larity F4 Add p a play cycles use only if testing signal stops before the end of the measure cycle Iv Ignore first sampled buffer when in Average Mode Prevent Errors Halt measurement if CPU OVERLOAD detected Waring Beeps if Application looses focus Halt measurement if Application looses focus Halt measurement if detected wrong Data buffers Set max in out difference fi D samples Sampling Made Asyncronaus Sampling Made not reccomended Restore Defaults Blinded Made use only if experienced audio syne loss Load Save Defaut Cancel Some advanced options can be selected in this window MEASUREMENT OPTIONS 9 The Remove Offset from Sampled Data option causes the subtraction of the offset present in scope data only for the computation of the Impulse Response The scope data and FFT from scope data are not affected by this option 9 The Normalize option causes the normalization of the calculated Impulse Response peak between 0 and 1 overriding calibration settings Sample Champion PRO 3 8 User Manual p 44 9 The Invert MLS polarity option changes the polarity of the stimulus The Add number play cycles option can be used if the testing signal stops before the end of measure cycle due to some bugs in the soundcard drivers 9 When the Ignore first sampled buffer in Average Mode option is enabled the first sampled buffer will not be averaged This can b
77. les IRE can be summed or averaged If the first line of the comment field of the file has the following content Wzx where 0 lt x lt 1 the file is weighted according to the specified value Fk Types rEuson Weg fe Pieper doream SPE E Ende Tine dorsi FE For brar ai cumcom anim oa Tera Vie pee in D peraton rd ea cb Uo ore Carb coe Tal pcre h qpq E Check ear Omm MET A gra sin mob Deck nus 4m Topcnem G apa m1 Fat SpsebumA lope C SE En Daae Test Speciu A d ape Vite Aet Ter Herta A 1 vert Sel peche s ae Loading Acar Tan Spesa A lax Ferd aoe Beer E loan far See Fad s rV s ET Lering mn Tam m2urugk done EH Hemy iE BedenEemeddzs 00 Fierce AI ox T For example W 0 5 attributes to the file a 0 5 weight This can be useful for performing loudspeaker sound power measurements or spatial averages of measurements made in different points of a concert hall The File Operations function can be used also for rescaling a frequency or time file by any desired factor just select a single file with the desired rescaling factor in the comment field as described above A custom TXT file with a list of Position Weighting associations can be created by the user The desired weighting value can then be obtained by pressing the button Get Weight from File in the Save Dialog before saving the file The TXT file must contain a list of weights in this form Loudspeaker Position
78. lf le E IV Show weighting Window over Selection y Dy Ec Hall tight Phaze Shifting t 0 at selection begin Window Shape Transfer Function Measurement Signal Amplitude 1000 m rol Cursor selection channel assignements IR 4 Sel Channe 1 L C 2 R Scope Sel Channe f 1L C 2 R Load Save Default 9 The FFT Size value is the number of points used by the current Fast Fourier Transform algorithm If the selection length on time data is shorter than the FFT size the missing points are set to zero zero padding Note that the implemented algorithm works on double precision complex data and both positive and negative frequencies are computed 9 The Weighting Window can be chosen among Rectangular Bartlett Blackman Harris Hanning Hamming Blackman shapes Full half right half left window types are available This setting can be changed also in the Sample Champion PRO 3 8 User Manual p 47 9 When Show Weighting Window over Selection is checked the shape of the window is superimposed to the plotted data in the Scope Window or in the Impulse Response Window 9 The Phase Shifting option when active performs a phase shifting on the FFT data An IFT Inverse Fourier Transform on shifted data forces the computed time series to start at t 0 do The Phase Shifting option is always enabled for averaged FFT of scope data When the Transfer Function Measu
79. maximum 16 bit integer value in absolute value when 16 bit output signal is used Depending on the filter gain at every frequency this could not occur and cause distortion In this case the program will show an alert window with some suggestions for solving this problem Sample Champion PRO 3 8 User Manual p 53 Error File C Sample Ehampien sD ata Pass band spe min module 0 0261 297220464838 max module 5 18313808558013 The operation leads to an overflow of 1252 The result may lead to distorsion Try to reduce MLS Level or save a compensation File with a different gain C3 OVERFLOW ERROR in Output Compensation operation Note 1 filtering is performed by working with complex numbers and the result is converted to long integers only at the end of the process 9 When the Normalize MLS signal option is enabled the output signal is normalized This option must be used when the alert window above is shown or when the generated signal is too low or not audible 9 A high precision narrow band Pink Filter can be applied if desired to the output signal by marking the appropriate checkbox D Since the result of the filtering operation will feed the sound card it must be smaller than 32767 the maximum 16 bit integer value in absolute value Depending mainly on the MLS sequence length and amplitude this could not occur and cause distortion In this case the program will show an alert window with some sug
80. n about the power common to 2 signals E Signal Anelpaiz Funtane BEE PIE Posed Funcbon 111 np n 4 Tiszte Furctien F2 21 2 1 tU d al see D Tes cU Mind px B PEE e ME TES wee s e a TERR P Eo ome Pak eek on Fo za fa teone wm e 525a GEA Aen neces MH ux hia Tiss test bam Mad Lie w min hz B5Ba T25BESH Fury was ay x Bae ope MAE BE3EB x 13374 nT seit mn menn ger DEREN S ix a mew wel ar s PIER u rs view Auer Quality corsputation del nir Eh ow Expos Dua Sample Champion PRO 3 8 User Manual p 90 ee 2 A a 5 f S568 Hz Miss Re 208 A In the figure above a Cross Spectrum example is shown The spectrum of channel 1 is plotted in green the spectrum of channel 2 in red and the Cross Spectrum in yellow The frequency axis is linear Also the MAX values of the spectrums are shown on the plot Note that the Cross Spectrum of ch 1 ch 2 can be different from the Cross Spectrum of ch 2 ch 1 The spectra of the 2 input channels can be plotted on the same plot as the the selected function in the frequency domain The input spectrum can be plotted also in 1 3 octave mode like in the example below frequency axis logarithmic Sample Champion PRO 3 8 User Manual p 91 9 Coherence This function is the ratio of the squared magnitude of the Cross Spectrum and the spectrum of channel 1 multi
81. n plots the LEFT channel versus the RIGHT channel It s easy in this way to obtain information about the 2 channels Example of a stereo musical signal Sample Champion PRO 3 8 User Manual p 93 Example of a mono musical signal The amplitude of the 2 signals are exactly the same since the slope of the line is exactly 45 degrees Sample Champion PRO 3 8 User Manual p 94 9 Audio Quality functions In an early version of Sample Champion the computation of SNR THD THD N and IMD had to be done in the Audio Quality Plugin Now the computation of SNR THD THD N and IMD can be performed in the RTA window Eb Sgr Anane Perce Aude Asabiy lF oaramelri3 tempol el eas ictal Toms 1 22150 33 Hz 77 7 dH res 5B 35 dE Bae eens Talu dB raj Iz 11 4 4 1 fi e ew E M Line Drap PUBL eie H Ell rill tll afl EL 11 41 TFE rem Part n imn l Ep Te HB iar i Lay Core mie gi ROAD me ATU ayar rana xe mr S Oe wl as r a a al Peepers a a eee mi Lm ij P Pe H Les Eoma mean SUR EE EY n p E miu Ta nm rma un tr vem ae repairs 9 SNR Signal to Noise Ratio measurement tam The SNR value is the ratio of the peak power level to the remainig noise power Measurement procedure In the Custom Signal Window Settings General Custom Signal a single pure tone must be selected The following figure shows an example
82. near or Logarithmic The overlay graphs can be set and enabled by clicking the Overlay button in the frequency data window lea This will open the Overlay Frequency Data window E Grula Frequency Date Be x ERIS eek Cer tec rie 33 Sj Rack recie He EE Use Cater Bat Fea CA EE data Crearlag i apa CA SD dwergs hs zig awak Frc3pOD Hu Fr wero Cater eae Fe EASE Darla apa Dr i ee sine ak Fs 4a000 Hi E cvemea cue rur Fee 0580 aioe aye pe ee See dk Fa 48000 Hi By clicking the Set button the currently plotted spectrum will be set as overlay curve and saved in the default data directory with the name shown as standard SPE file Also all previously saved SPE files can be loaded for overlay provided that they have the same FFT size and sampling frequency of currently displayed spectra The colors of the overlay curves can be changed by clicking the Color buttons The settings of the overlay curves are saved when the Overlay window is closed by clicking again the Overlay button A relative offset in Frequency Overlay can now be selected by the user adding or subtracting the desired amount in dB Spectra measured with different amplitudes can be thus easily compared Quality Control 15 This feature allows to assign upper and lower spectra The computed spectrum is then compared for each frequency with the upper and lower limits If even a single value is outside bounds a BAD mess
83. ng the view point only the view and localizing quickly the maximum peak of the impulse response The button a little lens is enabled only if the impulse peak is outside the plot view range Sample Champion PRO 3 8 User Manual p 24 SHOW extra information about the impulse on the plot area 15 oom X axi x1 00 T axis x 1 00 A Peaks tz5 85 mz T 1 0 L valrz AME M E e Cyc This function shows some extra information about the measured Impulse Response 9 OVERLAY the Free Field impulse Response if selected 16 This function allows to overlay two Impulse Responses A reference I R can be set in the Settings Compensation window Pressing the button 16 the reference I R Is plotted over the current I R Note 1 the sample rate of the reference and current impulses must be the same The reference I R color can be set by the user see custom color function Note 2 the I R files ire store also data selection information Reference I R data selected or unselected can be plotted using different colors see again custom color function PLOT Left and or Right channel data if the measurement is stereo 17 This function can be used for viewing only one channel when the measurement is stereo 9 CLEAR set to 0 impulse response data between Selection A cursors 18 This function can be used for zeroing a portion of the data 9 CLEAR set to 0 ALL impulse response data 19 This funct
84. nleger wv 16 bi File war Windows POM integer WAW 32 bi File eva Windows IEEE flaat WAWY 32 Git File weav Windows IEEE float WAV 64 bit File way de oome normalization options concerning WAV files LOAD and SAVE are available A Example a PCM 16 bit WAV file can handle integer data between 32767 A measured impulse response has a peak value of 0 254 mPascal If it is saved as PCM 16 bit WAV without normalization the resulting WAV file will contain only zero values The same happens when saving as PCM 32 bit WAV that can handle integer data between 2147483647 The IEEE floating point WAV format does not have this problem since can handle floating point data A normalization to 1 is available anyway for giving the better compatibility with other software The normalization feature can be disabled setting the normalization peak value to 0 9 TIM File Exporting Options When a measured STEREO IR or Scope is saved in TIM format it is possible here to select the channel to be exported TIM files support only 1 channel Load WAV File as A WAV file when loaded can be recognized by Sample Champion as Scope or Impulse Response Data When loading a WAV file that can be classified as Scope or Impulse Response by the Load WAV file as setting another option is available Impulse Responses the peak can be optionally normalized to 1 Scope data the current amplitude calibration can b
85. ny acousical parameters such as Reverberation Time Early Decay Time Definition Clarity and Centre Time Many options and features are available the acoustical parameters can be computed in wideband or in octave or 1 3 octave bands The results are available in tabular or graphic form Time data can be plotted in many modes Log Squared Schroeder Plot Step Response Cumulative Energy Inverse Schroeder Integration can take advantage of an user selectable noise compensation The computed data can be exported to Clipboard and the plots can be saved on disk as Bitmap images x JI der F joi dE 44 aoa 315 00 620 00 ESTERI rete CY gas Le Se eS OOF eS Em afer dE THOT d na EEE fi i 8 4 z un cl 2000 legon Er ICT 221585 DEDE TE 203 2e 3 in i EN More information and instructions about using this plugin can be found in Application Note 11 Application Note 12 Application Note 13 and Application Note 14 Sample Champion PRO 3 8 User Manual p 115 Enhanced View Plugin freeware Hi Enharced View rr B 4008 pnie Urvarag r pa E TER Pad E Lig Te db Rares Fim Ud x T Hj Speck Sekine Wacdcus Paghe H Fox Fart aed Daa heats FET SE UU Ua Bersani ai Pap 9 a je aaran Be TE iron LA clar Cima m Il keka d icr ane Hama y Selection EE 3 parja me E wap aef f E E 35 ELI se scar Merata iore i20 me Haltin A Fr ui LE PUR I Fna n re EE Me
86. o measurements You should eliminate all not strictly necessary programs running in background In Windows 95 98 by pressing CTRL ALT DEL it is possible to see all running tasks at least those installed by the user Close all programs and windows then press CTRL ALT DEL the best thing would be to see listed only Explorer In Windows NT4 or Windows 2000 use the taskmanager to see all running processes and try to close all unnecessary ones Refer to the operating system manual to avoid automatic start of the unnecessary tasks 2 How avoiding common errors using digital audio cards and improving sampling result The worst thing that can happen working with digital audio is distorsion caused by excessive input levels For musical audio recording this is a big problem because distorsion caused by A D saturation is usually very unpleasant The same problem can occur when making measurements with digital instrumentation The suggestion is to monitor constantly the peak level meters and adjust consequently the input level in the mixer As a rule the maximum peak level should be at least 6 dB under the saturation level Note that in some old sound cards the output section D A can give some distorsion on the last bit actually playing signals higher than 16384 22 14 in absolute value If you notice this using Sample Champion the solution is simple in Settings Level use Sample Champion PRO 3 8 User Manual p 104 values lt 50 Fort
87. omplex FFT operation of channel 1 divided by the FFT of channel 2 L R or the FFT of channel 2 divided by the FFT of channel 1 R L EL Signal amp nalpxx Functions ile x F in LAIN ha FF th Bahn Bier Leg Y raa If E F arzior LI Tes roe Rud 3 eS pape j A FF ar Crap TT Ure Crac GUS E pese sur TEE Tree Sade CT fa Ful Ecol dabit i Tua il v H Seber MA Let al H ton MH DT x iel peri hen wer RO EN al mur ir im Export Dues heika M 3662 24 2 rep JW mex ilal ase eT il z Pak IN b mp mkm SHE eM dB am imi EXE mih arn en sae A vive Sion Cie computation dials EB j Chen a When measuring a transfer function it s recommended to use a wide band signal MLS to obtain information on the entire audio band up to half the sample rate In some cases it could be useful to make some averages to improve the measures IMPORTANT NOTE when using the RTA functions ONLY the complex average is available and NOT the power average In other words the average is done on the complex FFT data and when average option is enabled IT S RECOMMENDED to use ALWAYS the internal signal generator to maintain the synchronism between each block of time data sampled and perform thus correctly the average 9 Cross Spectrum This is computed by multiplying one complex spectrum by the complex conjugate of a second spectrum It gives informatio
88. on a single workstation used nonsimultaneously by multiple people but not both You may access the REGISTERED version of this SOFTWARE through a network provided that you have obtained individual licenses for the SOFTWARE covering all workstations that will access the SOFTWARE through the network regardless of the number of persons who really use this SOFTWARE at a specific time You may not distribute any copies of the REGISTERED VERSION of the SOFTWARE or any part of it If you wish to use this SOFTWARE on additional computers you must purchase a license for every additional copy of the SOFTWARE TRIAL VERSION This is not free software You are hereby licensed to use the TRIAL VERSION of this SOFTWARE for evaluation purposes and test its compatibility with other products and computer systems without charge for a period of 30 days Sample Champion PRO 3 8 User Manual p 118 The UNREGISTERED TRIAL VERSION of this SOFTWARE may be freely distributed provided the distribution package is not modified No person or company may charge a fee for the distribution of the UNREGISTERED TRIAL VERSION without written permission from the author UNREGISTERED use of TRIAL VERSION of this software by any person business corporation government agency or any other entity after the trial period is in violation of copyright laws and may result in severe civil and criminal penalties All rights not expressly granted here are reserved by
89. ormat example Frequency Data Exported from Sample Champion DeltaF Hz 5 85937500 FFT Length 8192 Data from f 0 to f224000 00000000 Hz FREQUENCY SPL PHASE 5 859375000 6 6413279209929422 161 172205576833990 11 71875000 6 2717003153797555 142 893539456514790 17 57812500 5 7170485135652076 125 547620204225055 23 43750000 5 0415376898741889 109 294398830669541 29 29687500 4 3013566780912727 94 1163743150220921 35 15625000 3 5376477339700959 79 8990622262171842 41 01562500 2 7771475142395961 66 4949803316312349 46 87500000 2 0357062995903430 53 7595379304933006 52 3437500 1 3218866288923240 41 566081 7383207405 Sample Champion can save and load frequency data also in this format In order to have the better results the current FFT size setting in Sample Champion must be the same of the loaded FRD file Sample Champion PRO 3 8 User Manual p 13 Save pen Save Scope Imp leas SEHA E G E w v Save M oo c 077 00 2mm ER zo Art of exqualizstion 3 Audio Dorana Appi G delphi ds tester Cig Room Compensation Fr Applet Fie name Impulse Response 1 28 Fie hpe Floating Post Impulse Fesponse ae 9 The saving formats available depend on the current active window For example to save an Impulse Response click on the Impulse Response Window and then click on the save button Saving formats 9 If the
90. ple Champion PRO 3 8 User Manual p 18 9 Set custom colors 6 Time Data Graph Colors al wa Here custom colors can be assigned to plota A Black and White preset is available Data Selection for frequency analysis and Quick Spectrum 7 8 9 10 11 12 Button 7 can be used for a manual selection of data to be analyzed in Scope window ILUser input Sample Champion PRO 3 8 User Manual p 19 Inside the manual selection window other useful information can be obtained the microphone loudspeaker distance can be easily computed from the current data window just placing the beginning of data window at t 0 and the end of data window at the peak position Other distance computations can be done moving the start and end of the data window This can help to find and verify the true anechoical part of an Impulse Response and isolate the first floor or walls reflections Buttons 8 9 10 and 11 can be used for freely selecting and analyzing Scope Data by means of the mouse Click the menu Help Quick Help and select the Measuring and Analyzing Scope Data button to see a step by step guide for analyzing Scope Data Measuring and Analyzing Scope Data Upen the Scope Window m pen Selection in Time frequency analysis window Select a portion of Scope data for frequency analysis Selection Procedure 1 click this button to start the time data selection procedure 2 p
91. ple concerning the use of this function with 2 of the spectrum files in the setup package Open SC and select in the processing menu Spectra merge Load as File 1 Lower QC spe Load as File 2 Upper QC spe Select Combine file 1 and 2 and press Refresh set Top Plot value around 42 dB for plotting the spectrum Now you can attach the first spectrum to the second at the split point or vice versa and save the result of the operation 9 Apply Mic Weighting and Inverse to I R This function applies or removes if inverse the current microphone compensation to the current I R Note that when Microphone Compensation Settings Compensation is enabled only the FFT data are compensated This time data filtering operation requires remarkable computational resources and cannot be performed in real time It can be useful when an Impulse Response must be processed by a Time Domain plug in Waterfall Plot Room Acoustics Enhanced View Sample Champion PRO 3 8 User Manual p 83 9 Apply Frequency Weighting and Inverse to I R This function has the same behavior of the above Mic Weighting function but compensates the I R according to the currently selected frequency weighting Settings Compensation 9 Apply Pink Filtering and Inverse to I R This function applies to the Impulse Response a Pink or inverse Pink filtering This operation can be useful when analyzing in octave bands measurements per
92. plied by the spectrum of channel 2 It gives information about the mutual linearity of the channels The example below shows the coherence of a signal before ch 1 and after ch 2 a digital reverb effect 9 Cross Correlation and Auto Correlation These Time domain functions give information about the mutual correlation of 2 signals or the same signal in case of Auto Correlation It is very useful for finding for example echo or delays in time data In the example below a signal has been passed through a digital echo effect the peaks correspond to the delays with feedback set on the effect machine El Stenal Anal eos Funcznnz rr FATA Ate temo e pr a E 1 pim BE E Wiew iiia iy exenputalion debis i j me Sample Champion PRO 3 8 User Manual 9 Correlation Meter This function offers a quick and easy way to check the correlation between the 2 input channels This measurement can be performed by pressing only REC red button no signal generator for measuring for example a stereo musical signal In other cases it is possible to use the signal generator The result gives a correlation index between the 2 channels Specifically 1 means that LEFT and RIGHT signals are identical 0 means that LEFT and RIGHT signals are not correlated 1 means that LEFT and RIGHT signals are identical and exactly out of phase 180 9 Stereo Check This functio
93. raw daba 7911 91015625 The manual calibration is very simple after pressing the Scope data info button the user can write the desired dB value for LEFT and RIGHT channels only LEFT for mono and press SET This procedure assumes that a pure tone signal is in Scope data buffer LLANDISD ES E ANAE SOLS pee In gt Manual Amplitude cot MI BF Peak Peak SPL dB RIGHT Peak SPL dE scope dala info E e noo r2 e 100 SET lees p Inna peel nv In the above example a 100 dB value has been set The LEFT and RIGHT values 7976 and 7912 are the raw uncalibrated max values found in the Scope window written automatically after pressing the Scope data info button El la xl REET Soe epe noire eee BE ERE ag 26 60 73534403 eb BP 46530617 eb 56551 77340 26 61 235367158 26 208401 724 26 61 32393260 26 61 55771 528 2b DB Sa ZSEBS2 eb E2745 TETRA 1000112516650 2b E3E324 3753 26 5249507751 Z5 5338712844 26 52264 3444 b beo451 2454 26 Ba52ELD SU Sample Champion PRO 3 8 User Manual p 63 Settings Hardware DEDEM L1 Lr Lr K Settings Hardware General Advanced ZEE Compensation Calibration Hardware e Fie ERSTER RREERREREHEEEERERESERREERERE Sampling Device Information 16 bit Full Duplex 24 bit 1 Full Duplex PA bi 2 Ful Duples 3 s000 Hz 9 5000 Hz E
94. rd with the loop back cable as described in the configuration tips web page and perform a repeated sequence of measurements opening scope and impulse response windows Now different behaviors can be observed the impulse response could be still in time and clean in this case the adjustment for this buffer length channel setting and bit depth does not require any adjustment leave 0 Check the cleanness by zooming the impulse amplitude to max by means of the Y zoom slider Sample Champion PRO 3 8 User Manual p 42 the impulse is moving and probably is also not clean while in the loop back measure it should if input and output levels are correctly set increase the length of this buffer the current setting is marked in blue in the adjustment window if the impulse moves to the right at every measurement cycle and decrease its length if the impulse moves to the left The same adjustment should be done also when the impulse is still but not clean Check also ALL scope data to verify whether if something is wrong NOTE This function should be used only as last resource to compensate buggy soundcard drivers Sample Champion PRO 3 8 User Manual p 43 Settings Advanced l Bett Geom hier bud i H mag ee e Settings Advanced Measuremen Remove Offset from Sampled Data Normalize Computed Impulse Response Peak ta 100 gp F 5 1 100 Invert MLS Po
95. rement option is active the computed FFT data are normalized by the Signal Amplitude voltage value Use this option when analyzing Impulse Response data 9 The Signal Amplitude voltage value is the RMS level of the output signal It must be manually set Note that this value is expressed in milliVolts 9 The Cursor Selection channel assignments option assigns one of the two data channels to the FFT in case of 2 channel measurements This function is available also in the Sample Champion PRO 3 8 User Manual p 48 Settings Compensation DEDEM 5 9 4 E Settings Compensation General Advanced FFT Compensation Calibration Hardware File Options Measure Chain Equalization INPUT Correction Operation C Multiply Divide Enable operation S elect File E none Set Microphone Compensation case d5 Data tc Comp Example 1M Set Frequency Weighting Weighting MLS Equalization OUTPUT Correction Operation Enable operation W Normalize MLS signal ta Full Scale Multiply Select File lt none gt f Divide Pink Filter Free Field Reference Impulse Response Select File E nane Default Dur SE dBsData Load Save Default 9 Here the user can select some pre and post filtering operations on the sampled data or on the generated signals Sample Champion PRO 3 8 User Manual p 49 9
96. ress left mouse button inside time data window and move the mouse 3 release left mouse button when data are selected 4 click this button again for changing the current selection 5 Em click this button ta move the selection b click this button to select ALL time data 7 e click this button to cancel the selection Press F5 to refresh Disable Y Autascale option Ell in the Frequency Window Now a measurement cycle can be performed Repeat or Average After the data windowing selection the shortcut 12 Quick Spectrum E9 can be pressed to compute and plot the FFT of the selected data Sample Champion PRO 3 8 User Manual p 20 9 Overlay generated Signal 14 Iof x Cl 4 EB cm 3s liil Sel rx Ey FE 4 cel ep oe ESI 9 eet ESSERI fey EX Y Jeon a Time ms jf 3 HRL R E E Tot Power mot amailable Using this option the WAVE generated by the internal signal generator can be overlaid with the sampled data in Scope Mode This can be extremely useful for comparing the result of a measurement with the Ideal wave in the Time Domain The example above shows a 200 Hz Square wave the sampled wave is green and the generated wave is fuchsia PLOT Left and or Right channel data for stereo measures 15 This function can be used for plotting only one channel when the measurement is stereo 9 Plot Zoom 13 16 17 Sliders 13 16 17 can be used for zooming X e Y axi
97. rmalize FFT Spectrum s Magnitude 19 ooo SO CCU Dads E up dna osi atten ec nceoautemommancasals 80 File Operations Position Weighting associations TXT file sssssssss 81 erede EET 83 Apply Mic Weighting and Inverse to I R cc cccccccceceseeeceeeeeeeeseeeseeeeeeeeseeeeeneesaeesaes 83 Apply Frequency Weighting and Inverse to I R ec ceccceeceeeeeeeeeeeeeeseeeseeeeseeeseees 83 Apply Pink Filtering and Inverse to I R cc ecccccceeeceeeeeeeeeeeeeseeeseeeeseeeseeeseeeeseeeseees 83 Cleat alll Data BUME S wacisasvsssacsaanenapsadaieacamandeunanenaasawanandaneasdaeuaunlancd inane Un FREU E DE 85 RTA Real Time Analyzer sese 86 MEAN SUSE TOPIC OD nd text dominii S teda emu doti pt pat uultis D uda d dama EDRPE eT UM e FRI bd 90 OSS SOS CU LEID aerate seca Sa ce i tatto Pep av Ratio dO Do EUR DOREM DEM ret ane SE PR said 90 Sede T S T UU m 92 CroSS COITelallol as sod anie tid stem eati a test cuv vena Gea Moe deed etu E alt 92 AUtOSCOImelallolss caia retenus mtanotdm motu ei satan uM dA D bob oot COR La 92 eos aMisiic E S UD EUEE 93 EOOD 161 d 93 AUCIO QUaIITY TMIN GIONS amp 2 20 25 Aehoiaetstacc eta ctialadadastsiacavaucsaeas a E a Saa ae 95 E E saree gece PEET PETTEE EEEE EN t MM IM EE LU M EE 95 TRAD AC Ea EIN MT EU 98 WE ce T P ER 100 Load and
98. rt frequency data as a TXT file and use the following exporting options Settings M Expat Frequency Data as TT ASCIIH file Magnitude Lin Phase v Add a comma after Magnitude Sou Real Pan the Frequency value 4 Magnitude Sau dB Imagna Part Use the following Manufacturer Microphone Data File Format options Comment and other information lines Column 1 Calumn 2 d Column 3 Freq mi Freq Re Response mM Index 9 Resp gt Phase gnored s bLalumn 4 Response Phase ager 9 When the Frequency Weighting option is enabled the content of all frequency domain banks FFT of a selection of scope or impulse response data are processed by performing the selected frequency weighting A C U or AU 9 When the MLS Equalization OUTPUT Correction is enabled the output signal is filtered before being sent to the loudspeaker The selected operation Multiply or Divide is performed in the frequency domain using the selected file SPE and complex numbers This operation is denoted In the flow chart as OP2 The number of samples of the selected frequency SPE file and the internal current FFT size must be the same Also the Sampling Frequency of the selected file and the current internal Sampling Frequency must be the same do Since the result of the filtering operation will feed the sound card it must be smaller than 32767 the
99. s of the plot Y Zoom 17 is very useful to check negligible signals Sample Champion PRO 3 8 User Manual p 21 Impulse Response Window pen Save Scope Imp leas SEHE a oo oo p G I Impulse Response 132 ae ur Eli 1 2345 6 Jeon mPascals Peak 59 mA Time ms a Oc g y 415 16 T 1819 5 SEE L Re A AutoScale ON OFF Set View Time Interval Lock Unlock View data values Export time data as XLS Excel file Save snapshot of the data window as bitmap image Print the data window Set custom colors oOah WN l Two impulse response selections for frequency analysis are available and Data Selection B Two series of buttons one for Selection A and one for Selection B are available with same functions 7 Manual Data windowing and additional information 8 START selection if no data are selected or CHANGE selection size if some data are selected moving the selection cursor nearest to the mouse pointer 9 MOVE selection 10 EXTEND selection to the current maximum input length or maximum FFT size 11 DISABLE selection 12 Quick Spectrum 13 CREATE selection B with the same size as selection A starting at the end of selection A Sample Champion PRO 3 8 User Manual p 22 14 MOVE the view point to localize the maximum peak of the impulse response the button is enabled only if the impulse peak is outside t
100. s000 Hz 9 en Hz 9 8000 Hz 9 000 Hz 24 1 192 E 11025 Hz E 11025 Hz E 11025 Hz ae gis ug 15000 Hz E 16000 Hz 9 15000 Hz T Py E 22050 Hz E 22050 He E 22050 He PLINER Dua M 24000 Hz 9 24000 Hz 9 24000 Hz Tip Custom Frequencies 9 32000 Hz 9 32000 Hz 9 32000 Hz tan be tested just typing 44100 He 44100 He d 44100 Hz ihe desired walue in the i 43000 Hz E 48000 Hz E 48000 Hz pen dier jene the E 8200 Hz 9 8200 Hz 9 8200 Hz site EE 9 26000 Hz 9 26000 Hz 9 26000 Hz Iv peser alowed E 132300 Hz E 132300 Hz E 132300 Hz BE Frequency nat allowed E 144000 Hz E 144000 Hz E 144000 Hz T Frequency not tested 9 176400 Hz 9 176400 Hz 9 176400 Hz pon EIE E UNUM 9 192000 Hz 9 192000 Hz 9 192000 Hz ANE Audio Device Playing 0 LI TIE e Check Freq 36 kHz OUT Wav Out 3 4 Delta 44 Driver t 4 0 Wave Audio Device for Recording IM r IM PCM In 2 4 Delta 44 Driver t 4 D Default Lancel n 9 Here some information about the installed sound card s are shown Note that in Windows Millenium Windows 2000 and Windows XP some frequencies not actually supported could be shown as available the operating system emulates those frequencies Sample Champion PRO 3 8 User Manual p 64 Settings File Options mage e e 0 HS v Settings File Options Load wv AV file as
101. sent check also the mute button Obviously every 3D sound Reverb Chorus Spatialization or other similar controls must be disabled for these kinds of measures 9 Not still Impulse Response When the measured Impulse Response has a correct shape for a loop back measure but does not remain still during the cycle measures the reasons could be different 9 1 The sound card works internally at 48 kHz and emulates other sampling frequencies this is the case for example of the SB Live In this case for MLS measurements only 48 24 and 12 kHz sampling frequencies must be used Other frequencies will produce an unclean and not still Impulse Response 9 2 The sound card shares an IRQ with other devices of your system NOTE this affects every audio software working in your system so it could be worth to avoid it even if you will not use Sample Champion The worst situation concerns IRQ sharing between audio and video devices because during sampling graphic information is often shown and this can cause problems Sample Champion PRO 3 8 User Manual p 110 This is an example of IRQ sharing to be avoided a Gestione periferiche Anma Visualizza EE aa direlko ala memoria HAA 5 MM Inputfoutour DO E i Lelo di interrupt 80 93 sa 0 d say L ss 3 EREJE i 54 6 88 se 8 musa 9 v 55 Lz ml Isa LS G 583 14 1500 15 POO Lb S IPCD LL PCH LL CDL PCE EL PCL RH Memoc
102. ser Manual p 111 Propriet Matrox Marvel G200 AGP Italiano I 3 x Generale Driver Fisorse m Matrox Marvel G200 AGF Italiana Impostazione risorse H Intervallo di memoria DSO00000 D37FFFFF H Livello di interrupt 11 Ef BB Intervallo di input output 0360 0366 mmm OO omm rm Impostazione basata su Configurazione corrente Elenca periferiche in canflitta Nessun cantlitta Video Card IRQ setting In this case Windows doesn t allow the manual configuration of the audio device IRQ and the reinstallation could be necessary For this purpose follow the audio device and Windows installation guides Sample Champion PRO 3 8 User Manual p 112 Other features available in the plugins Audio Quality Plugin E Audio Quality Pim EJ Signal Generator SHA THD THD N Mp Em Harmonics Tone 121 OF Ho 81 0 dB ms E Freg Hz alue dA mel Harmonie 276 65 p rity ati etl gm eu g 113 30 10061 13 3 Cur Background Haise 12 6 dB THO O 0018 THLDIeH UDI Top 100 j dB Range 140 dB This module performs the following measurements 9 SNR Signal to Noise Ratio 9 THD and THD N Total Harmonic distortion 9 IMD Intermodulation Distortion More information and instructions about using the plugin can be found in the Application Note 8 Filter Banks Plugin freeware ER Filtea Banks Fiker Banks
103. ses an internal data block align of 3 bytes actually 24 bit This mode is suggested for sound cards with A D and D A converters with bit resolutions of 18 or 20 bit for example Pinnacle sound card 24 bit 2 uses an internal data block align of 4 bytes actually 32 bit This mode should work with all 24 bit sound cards Sample Champion PRO 3 8 User Manual p 37 9 The Sampling Rate is the same for IN and OUT When the settings window is open or the sampling rate is changed the program performs a silent full duplex synchronous PLAY REC test If the selected sampling frequency is not supported by the sound card a red alert message is shown Note that the alert is shown also when the audio card is busy for example is currently used by another program Every sampling rate is supported in post processing mode for example loading a TIM file sampled with MLSSA system at any sampling rate do A CUSTOM SAMPLE RATE CAN BE SET JUST BY TYPING IT IN THE FREQUENCY BOX Using the arrows near the frequency box the standard sample rates can be selected 9 The Buffer Length input buffer is actually equal to the value selected 1 for example 8K means 8 1024 1 8191 samples in order to have the same length of the corresponding MLS sequence 9 The Block value indicates how many measurement cycles must be performed before stopping the sampling This value can be changed also in the Quick Settings Window 9 The Mode op
104. t 5018 72 mPascals Peak lt gt 34 00 SPL Peak dB RIGHT 24 06 gt E gt 5018 72 mPaseals Peak lt gt g4 nf SPL Peak dB Level Freg Graph Labels f Peak a Pascals Peak May BRS In JF axcals rea r Peak SPL dB Log EPL Peak dB EPL Peak dB C RMS Calibrate INTERNAL source level Hal Calibrate EXTERNAL source level ail Open Mixer Manual Amplitude cane SPL Peak Peak SPL dB RIGHT Peak SPL dB Scope data info EX v o 32767 gt 0 SET Load Save Defaut Cancel When this option is enabled the soundcard Channel 2 INPUT must be connected directly to Channel 2 OUTPUT loopback Example of connection OUTPUT Channel 1 INPUT Channel 2 Sample Champion PRO 3 8 User Manual p 59 Adjust input and output levels of Channel 2 in order to obtain a low input peak level Usually a value of 1 or 2 of the peak level is enough to activate the sync function Peak Input Level Fd l 1 The microphone or any other input device can be connected to Channel 1 INPUT The power amplifier and loudspeaker can be connected to Channel 1 OUTPUT When this option is active the saving window consents to optionally save only the impulse response channel 1 data channel 2 contains only sync information D Tip In most of soundcards the crosstalk between channels and between in out is sufficient for the sync information very sensible In this case
105. the Automatic latency feature can work also without connecting a loopback cable on channel 2 Amplitude Calibration it is possible to perform an amplitude calibration in real time using the internal signal generator or an external calibrator standard 1 kHz calibrator or manually The Input F S field shows the measured input peaks Left and Right channel as full scale percentage The Input Level field must be used to insert the requested value be sure to use or according with the international settings of your operating system The Scope Value and Spectrum Value fields are filled by the program at the end of the calibration procedure All other check buttons can be selected by the user to change the input calibration level mode Peak or RMS the level units Volts mVolts or SPL dB and the view mode Peak or RMS Sample Champion PRO 3 8 User Manual p 60 AMPLITUDE CALIBRATION PROCEDURE 9 CALIBRATION USING AN INTERNAL SOURCE Open the Settings Calibration window Connect the INPUT of the audio card directly to its OUTPUT loop back Press the calibration using an INTERNAL source button to start the procedure A pure tone 1 KHz will be generated by the sound card Open the mixer by pressing the Open Mixer button check by means of the input peak level meter if available the absence of any saturation and that the indicated values are reasonable for example 6 dB for both channels Chec
106. tion about the measure At every measurement cycle the number of blocks that have been processed and the peak position are reported here This log should be used especially for Impulse Response measurements the value of the peak position must be the same for every measurement in the same cycle If this does not happen some measure error has occurred and further investigation is required 9 Other features in the Information window Estimated remaining measurement time Impulse Response Peak Noise ratio Automatic control of repeated measurement correctness checking peak position of every measure Sample Champion PRO 3 8 User Manual p 71 9 The Information window can be optionally opened when a measurement starts from the program menu and the floating menu it is possible to enable the automatic management of this feature 9 During measurements in Blinded Mode this is the only visible window and the remaining parts of the screen are black During normal measurements this window can be open or closed It is possible to select all or part of the history log using the mouse and copy it to the clipboard using Control C Show Hide Control Bar l Set Geom hier fd int H CEDER E1 Show Hide Control Bar About Sampling Settings Fs Hz 48000 Hz Bit Sample 16 Channels 2 Input Buffer Status Us Sampled OF Tot 4K 85 3 ms Status FREE sampling a pip 5
107. tion indicates whether measured data if Block gt 1 are averaged or the data measured at every cycle overwrite the data of the previous measurement This setting can be changed also in the When the Power Frequency Average Mode is selected the magnitude is averaged and the phase information is ignored set to 0 The power average mode can be useful when sampling pure tones generated by an external source asynchronously Note that when a spectrum averaged in power mode is saved the SPE file is compatible with all other SPE files a vector of complex data positive and negative frequencies but the Real part of the data is the magnitude of the spectrum while the Imaginary part of the data is 0 AN WARNING When the Complex Frequency Average Mode is selected the average in the frequency domain is actually computed on complex data This kind of average should be performed ONLY by using the internal signal generator to assure synchronism and coherence between all measurements This setting can be changed also in the Quick Settings Window When the audio input format parameters are changed the output format will be changed accordingly Also a Buffer Length change will cause the automatic selection of a right length MLS signal Output parameters and MLS signal settings can still be changed manually Sample Champion PRO 3 8 User Manual p 38 NOTE Automatic Latency Calibration option can be used only when 2
108. u drea det ua neun me cue zv sat e vul dg Ursus iun dE 69 jb 70 Measurement Information WiINGOW ccccsccseeceeeceeeceeeceeeseeeeeeeeneceueeeeetseeseeneeeeneeanes 11 COnTONB A acta cecuerconsnazsdenatansencenacnaeredenctaactancesaedtesansapreceesadaraacoanscetdarsaarersnsespnsanasearediaanns 72 gmie cuasmu it e 73 FOES ON aI ON WMT 13 Dic 14 Sample Champion PRO 3 8 User Manual p 2 Sampling engine commands ISec Play Sync Rec and PIA astu dace rave dade tale ect dau drea uU ceo aad 76 Windows managing commands Maximize MINIMIZE sas saree asda nene tess adabdeencancacseaacnadigteasandhat shee EEEa Ea a TE 16 RTO CS secre ci cs there apc teens 77 Post processing functions leid od mU 78 RSV SS SU nas irs Men usp I oes pan oq teat retra tata teque C T 78 Normalize Ts Peak fo sseoisericatts tiara Das eben puit qur E UL URS Re tu Neon id eta a a E ati Eb 78 FING aN G SUDUACTA IN ONSE boanion Tea a 19 MV Ira ER de tae aerstan vated sae nea aanncbaise Sastgaremravmanmadiabetea nb aeacaancaunmnca ed aunesee Hr 19 Move Impulse Response Peak a cccccccccsecceecseeceeceeeceeseeecueceeceseceseeeeeeseeeseeeeeeeees 19 Move Impulse Response Peak at X 100 at Measurement Cycle End 19 Increase Decrease No
109. u may not reverse engineer decompile or disassemble the SOFTWARE Copyright 2005 Paolo Guidorzi amp PureBits com All Rights Reserved http www purebits com info purebits com Sample Champion PRO 3 8 User Manual p 119
110. unately Sample Champion gives you a simple way to analyze the acoustical performance of your audio card in terms of distorsion in order to perform a fine tuning of your level settings See the application notes concerning this kind of measurements 3 In Sample Champion the wave and the spectrum data seem to jump high and low What happens Sample Champion has the Y Auto Scale option turned on default oimply perform a test measure to let the program measure the maximum peak amplitude and then turn off the autoscale or in a repeated or averaged measure cycle turn off the option once that the result of the first measure is plotted When the austoscale is off it is always possible to perform a manual autoscale by pressing the button on the left of the autoscale button Troubleshooting Known issues We had a problem sampling with TurlteBeach Pinnacle and length of the input buffer equal to 16K samples with pure tones or custom waves NOT MLS signal The problem is certainly due to a bug in the Pinnacle drivers since it is not present with other audio cards Solution if you experience this problem avoid that input length use instead 8K or 32K his problem does not affect MLS measurements impulse response because when a 16K MLS signal is selected the actual input length is 16K 1 samples Windows 2000 seems to be very stable and suitable for audio measurement software But some precautions must be taken We
111. z ea aras c e aac SONBHONI TT HAT mccum ceorexim Tube mods ond armas geras ENT dz WS CONFI Tera messe dniim rmi This function can be enabled only in Windows 95 98 and Me Other fine tuning options are available File menu 9 User Graphical Interface adapting to XP This can be enabled when SC runs in XP family operating systems to adapt the windows sizes and other graphic parameters 9 Adapt to Large Fonts Sample Champion can work correctly also when Large Fonts are in use in Windows Since the Windows appearance with Large Fonts in use is different in different Windows versions the user can select the better Mode for an optimal setting Sample Champion Tweak v Enable Syshan Resources Manor Set Shep 4 with RTA window and small buffer Adapt Lier Interface to Windows XP Adept Liser Interface ta Large Fonts Adapt Options Mode 1 C Program Sampe Champlom abate xamplel wre _ Mode 4 ino action C2 Programmi Sempe Champion Data Room Response re G Programmni Sample ChampionDatalstereo DR ire The toolbar will be shown correctly when the optimal Mode is selected The Adapt to Large Fonts function is enabled or disabled automatically when the user changes the Font setting in windows but can be also enabled or disabled manually The Large Small Fonts setting in Windows can be found in Screen Properties Settings Advanced Large Fonts 120 dpi or Small Fonts 96 dpi The Small Fonts setting is

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