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Noise Reduction User Manual

1. Unda All Disable UndorA eda Ctrl L 3 With the Pencil tool J draw in a new waveform right over the click APPENDIX A TIPS AND FREQUENTLY ASKED QUESTIONS 538 gt Restoring clipping regions in Sound Forge To restore aclip manually in Sound Forge do the following L Select approximately 15 milliseconds of the audio s click noise M ake sure the click is centered in the selection 2 From the DirectX menu choose Sounic Foundry Clipped Peak Restoration The Clipped Peak Resortion dialog will appear Sonic Foundry Clipped Peak Restoration ACnoise way Untitled 3 dB with limiter E dE no limiter No Attenuation lirit clips Default all parameters 3 Select the No Attenuation limit clips preset from the drop down 4 Select the Crossfade edges check box so that it is enabled 5 Click the OK and the clip should have been restored If not try making a larger selection in the file around the clip Using non DirectX Noise Reduction in Sound Forge If you have the non DirectX version of N oise Reduction you may continue to use it The non DirectX N oise Reduction plug in included tools for manually finding and removing clicks in Sound Forge These non DirectX plug ins can still be used in conjunction with the new version of N oise Reduction H owever they are not included on the CD ROM with the newest version of N oise Reduction Why are my Noise Reduction presets unavaila
2. Seren ERa L ee zA 1225 2 450 3 675 4 900 6 125 7 350 2 575 3 500 11 025 Hz E z Keep residual output Fit size 2 to 1 024 points 5 12 Fi Reset T Capture noiseprint Automatic capture timeout 005 to 15 seconds 1 000 General Noiseprint CPU 24 bit processing M Create undo Selection 00 00 00 000 to 00 00 04 999 00 00 05 000 elean Channels Wono NOISE REDUCTION CHP 2 19 Changing the fit size T he Fit size determines how many envelope points are created after capturing the noiseprint In general using a large number of envelope points is recommended as you use more envelope points the N oise Reduction algorithm can work more precisely to reduce noise You may want to use a smaller Fit size if you plan to manually modify the envelope points ne ane ane pe iii ccc a Mis 1225 2 450 3 675 4 900 6 125 7 350 2 575 3 500 11 025 Hz Keep residual output Fit size 2 to 1 024 points 512 box or type a value in the box If you change the Fit size value click the generate new envelope points Manually adjusting envelope points The envelope points above the noiseprint indicate the amplitude threshold below which the N oise Reduction algorithm operates T his means that for most applications the envelope should be slightly above the noiseprint The envelope points can all be raised or lowered by using the Envelope amplitude control If you raise the UE hi
3. T Do not allow in place buffer size increases Help 4 M Crossfade edges 1 to 1 000 mel 3 I Use plua in s requested mininimum buffer size I Crossfade edges 1 to 1 000 ms E El me Irpugmestendsiength I Keep residual output M Bypass C Inserttail Mix tail Ignore tail V Realt FOUHDRY Click Removal CPU 24 bit processing V Create undo Selection 00 00 02 298 to 00 00 02 426 00 00 00 127 5 Channels Mono _Seteston _ 6 From the pop up menu choose Configuration T he Real Time Preview C onfiguration dialog will appear 7 Set the Crossfade edges to 3 milliseconds T his setting will be applied each time you use Click and Crackle Removal in future restorations 8 Click OK to remove the click noise within your selection If the click noise is not totally removed repeat steps 2 8 and adjust the Sensitivity and Max click size controls EE SSS 4 Note If you are having trouble removing the click noise try the same steps using the V iny Restoration plug in a Using the pencil tool 2 in Sound Forge to remove clicks L Magnify the click on the audio s waveform 2 Select the Pencil tool from the tool bar Or from the Edit menu choose Tool and then Pencil Undo Audio Plug In Chainer Ctri 2 Redo Pencil Chrl Shifte Repeat Audio Plug In Chainer Ctr Pre roll to Cursor Chrl S hift k v Ed Magnify Go To Ctri G Selection
4. 32 gt oo oo Noiseprint keyboard shortcuts Navigation Left arrow Scroll left Right arrow Scroll right Page Up Scroll right one screen Page down Scroll left one screen Home Scroll to beginning of graph End Scroll to end of graph Selection Shift Left arrow Select previous envelope points Ctrl Shift Left arrow Select multiple previous envelope points Shift Right arrow Select next envelope points Ctrl Shift Right arrow Select multiple next envelope points Shift Page Up Select to beginning of screen and scroll down horizontally one screen Shift Page Down Select to end of screen and scroll down horizontally one screen Shift Home Select to beginning of screen Ctrl Shift Home Select to beginning of graph Shift HE nd Select to the end of screen Ctrl Shift End Select to end of graph Ctrl Tab Shift selection position to the right Ctrl Shift Tab Shift selection position to the left Ctrlt A Select all envelope points in graph Ctrl Shift A Remove selection Ctrl Up arrow Move selection up by 1 dB Ctrl Down arrow Move selection down by 1 dB NOISE REDUCTION CHP 2 33 Magnification CHP 2 Up arrow Shift Up arrow Down arrow Shift Down arrow Ctrl Numpad Shift HVumpad Ctrl 4 Numpad Esc Ctrl Right click Double click Magnify selection horizontally by two Magnify selection vertically by two Demagnify selection horizontally by two Demagnify selection horizontally by two Zoom selection in full horizonta
5. CHP 2 NOISE REDUCTION 10 Removing noise from a recording The Noise Reduction function is a two step process capturing a noiseprint and removing the noise U sing the N oise Reduction plug in to remove noise requires different methods of noiseprint gathering depending on the host application you are using T his manual covers the following sound editing programs e Sound Forge e Vegas e Cakewalk Pro A udio Steinberg WaveLab e IQS SawPro Using Noise Reduction with Sound Forge L Open ACnoise WAV from the folder where you installed N oise Reduction and select a region that contains only the air conditioner noise We have created a region in the file for this purpose 2 Double click between the region markers to select the data in that region ig ACnoise way 00 00 00 00 00 01 00 00 02 00 00 03 00 00 04 Select the AC noise ajad ooo S aafe w m m ejeje 00 00 04 545 00 00 04 986 00 00 00 441 3 Select Sonic Foundry Noise Reduction from the DirectX menu The default preset contains the parameters that will give you good results The most important parameter is the Reduce Noise by slider at the top of the dialog that determines the amount of noise attenuation Reduce noise by Off to 100 dE _ fH 62 8 4 Click on the Capture noiseprint check box NOISE REDUCTION CHP 2 11 5 Press the Preview button on the N oiseprint page N oise Reduction will make one pre
6. To register on line with Sonic Foundry please follow the steps outlined in the registration wizards upon installation of this product T he registration wizard will appear the first time you use N oise R eduction Registering your product will provide you with technical support notification of product updates and special promotions exclusive only to N oise Reduction registered users Registration is required within 7 days of installation or your product will expire Sonic Foundry product registration helps protect against software copyright infringement and allows us to provide support exclusively to registered users If you do not have access to the Internet registration assistance in English is available Please contact our Customer Service Department at Telephone 1 800 577 6642 toll free in the US Canada and Virgin Islands 800 000 76642 toll free in A ustralia Denmark France Germany Italy Sweden UK Netherlands and Japan 608 256 3133 extension 2300 In all other countries E mail customerservice sonicfoundry com Fax 1 608 250 1745 Registration assistance is available by telephone 24 hours per day seven days per week Sonic Foundry Inc Sonic Foundry Europe 754 Williamson Street PO Box 2903 M adison WI 53703 2601 CX Delft Sales C ustomer Service Only in N etherlan ds N orth A merica 1 800 577 6642 Technical Support 608 256 5555 Fax 608 250 1745 The information contained in this manu
7. From the pop up Menu choose Zoom Selection Only those points should be visible igus NUE WRE Zoom Selection Zoom Wur ull arabian Normalize dB Add Paint Reset Selection Select All Ctrl 4 5 514 8270 Logarithmic 7 Line Graph Bar Graph Filled Graph Change the selection type in the noiseprint graph The normal type Is to select points but by right clicking while holding down the left mouse button you can toggle the selection types and three different zoom types e The first type isa vertical zoom window T histype allows you to zoom into a specific level range of the noiseprint ri Pi ae Prt i a i aa eTa 2 758 5 514 B 2r0 11 026 13 782 16 538 19 294 22 050 Hz The second type is horizontal zoom window T his type allows you to zoom into a specific frequency range of the noiseprint ian i 1 EE Eee AEU 120 i 5 514 B 2r0 11 026 13 782 16 538 19 294 22 050 Hz NOISE REDUCTION CHP 2 23 e Thethird type isa combination of vertical and horizontal zoom It functionsin much the same way as the selection mode T his type allows you to zoom into a very specific frequency and amplitude range of the noiseprint 2 758 5 514 2 270 11 026 13 782 16 538 19 294 22 050 Hz To return to the selection mode toggle the cursor until it becomes a cross hairs You can use Grab Pan mode to scroll the noiseprint graph at the current magnification This is useful for nav
8. 49 What is the best order to run the effects when restoring old records 49 Why do I hear stuttering during real time previewing 0 cece ees 49 Noise Reducton ccc teen eens 51 There are too many controls in Noise Reduction where do I Start 51 Which Noise Reduction mode should use 000 ces 52 Applying Noise Reduction without a noiseprint a n 0 0 0 0 ees 52 Capturing anoiseprinton the fly 0 ccc ete eee aes 52 Creating noiseprint envelopes manually nananana nannan ee ees 53 Modifying the amount of high frequency reduction with envelope points 54 Why am I having trouble removing hiss from 8 bit files 000 54 Why do I hear flange type artifacts during processing 000 eee eees 54 SS OUMG FOJE sich cich a wichsnet dtatand aca aa an a a a a a a a ated 55 Using the plug ins with the Sound Forge Audio Plug in Chainer 55 Removing clicks and pops manually in Sound Forge 000 eee eee ees 56 Restoring clipping regions in Sound Forge 00 cece eee eee 58 Using non DirectX Noise Reduction in Sound Forge 00000e eee 58 Why are my Noise Reduction presets unavailable in the Sound Forge Audio Plug in Chainer 00 cece eee 58 TABLE OF CONTENTS ap VEGO sine ese ede adebes faeces sseerasetae beeen se esueeseunseeeetes 59 Using Noise Reduction as a Bus FX with VegaS 0 ccc eee 59
9. Gapper Snipper WS Sonic Foundry Pitch Shift Sonic Foundry Graphic Dynamics WS onic Foundry Reverb 2 A dd the N oise Reduction plug in as an A ssignable FX by double clicking and clicking the FX Plug In Chooser s OK button The N oise Reduction dialog will appear 3 On the N oise Reduction dialog click the Capture Noiseprint check box 4 M ake atime selection in Vegas M ake sure the tracks you want to apply N oise Reduction to are assigned to the Assignable FX with the N oise Reduction plug in 5 On the Vegas transport bar click the play gt button If loop play is enabled click the stop button Otherwise Vegas will continue playing the time selection A fter the noiseprint has been captured use the N oise Reduction controls to edit TIPS AND FREQUENTLY ASKED QUESTIONS APPENDIX A 61 Using the pre fader function with Assignable FX W e recommend using A ssignable FX as pre fader sends in V egas To set a track s FX as pre fader sends do the following L Click the Track send fader s label to display a drop down list of busses and A ssignable FX piir Par Center Aus Inf Aux B Inf 2 Click the A ssignable FX that has the N oise Reduction plug in 3 On the Send fader right click and choose Pre Volume from the sub menu i o te AO M8 Jt Fiir noo Fost coe 4 M ake sure the Send fader is set to Inf Otherwise you will hear a mix of unprocessed an
10. Keep residual output check box inverts the N oise Reduction process instead of hearing the source material you are keeping you will hear the noise you are removing T his can bea valuable tool when adjusting parameters because you can hear whether you are removing any of the source material you want to keep I Keep residual output For example if you are reducing some noise from the background of a speech and you hear some of the speech in the residual output you know you are adversely affecting the quality of the source material You can then change the settings so that none or as little of the residual output contains the material you want to keep Noiseprint modificaton and navigation The Noiseprint page is used to manually modify the noiseprint envelope points By making modifications on this page you may tailor the effects of the process to work better for specific source material Learning how to modify the envelope points takes practice but can lead to achieving better results A fter you have captured the noiseprint the frequency spectrum of the noise is displayed along with envelope points outlining the noise model the algorithm with use Sonic Foundry Noize Reduction opinion way ei Es Name Untitled a Cancel Reduce noise by Off to 100 dE _ __ fH 62 8 __ Cancel Reduction Mode 0 Moise bias dB Caa 0 0 Help Nolseprint i Average Peak Save As Delete n Preview eo ee eB T _
11. Off to 100 dB ao es Reduction Mode 0 v Noise bias d8 c k gy foo Help C Peak Noiseprint Average 0 120 0 1 225 2 450 3 675 4 300 6125 7 350 8 575 9 800 11 025 Hz IV Keep residual output Fit size 2 to 1 024 points 512 g Eit Reset I Capture noiseprint T Automatic capture timeout 005 to 15 seconds 1 000 E General l Noiseprin CPU 24 bit processing M Create undo annels Mono Sometimes especially for voice lowering the Noiseprint envelope in the low frequencies can prevent the bulk of the artifacts T he effectiveness of this adjustment however is very much determined by the nature of the noise For example if the most objectionable portion of the noise is high frequency material asin tape hiss the Noiseprint envelope can be effectively lowered in the lower frequencies Sound Forge The following section relates to tips and questions as they apply when using N oise Reduction with Sound Forge 4 5 Using the plug ins with the Sound Forge Audio Plug in Chainer In Sound Forge the A udio Plug in Chainer allows you to run multiple DirectX effects at a time For example you could run two instances for N oise Reduction each with different settings and noiseprint parameters Or create a chain that performs Click and Crackle Removal followed by Vinyl Restoration and then finish up with N oise Reduction all in one pass based on your setting
12. U se the Affect frequencies above slider to determine the frequency level that the Reduce noise by value affects For example you may apply noise reduction to high frequencies by setting the Affect frequencies above value to 8 000 Hz This setting is useful when source material is being adversely affected by the amount of reduction you are trying to achieve TF Note If a lot of broadband noise remains after running the Vinyl Restoration try using Vinyl Restoration without any noise reduction 0 dB Then use N oise Reduction to improve the signal to noise ratio lt lt lt V V x VINYL RESTORATION CHP 4 oJ Removing clicks Removing clicks is as easy as Moving the Click removal amount slider Click removal amount 1 to 20 I HIH q2 This control determines the sensitivity of the click and crackle removal algorithm The default setting of 10 usually works well for most applications A larger number will remove more clicks but may also reduce some transient material that you would like to keep such as drum hits If you begin to notice wanted transients being reduced decrease the Click removal amount For extra glitch free recording use the Sonic Foundry Click and Crackle Removal plug in before and after running the Vinyl Restoration function For more information see C lick and Crackle Removal on page 35 For some applications it may be
13. Using Noise Reduction as an Assignable FX with VegaS 0220eee ees 60 Click and Crackle Removal 0 ee eee eee eas 62 Choosing between Vinyl Restoration and Click and Crackle Removal 62 Can set Click and Crackle Removal so it keeps high hats and cymbal hits 62 Using the Keep residual output check box to fine tune parameters 62 Glossary sae5 ows bane se Soe bay ade Gana geweans eee 63 INdOX Lo ccc ee eee eee ees TABLE OF CONTENTS 5 CHAPTER E res Introduction A Reading the manud In developing the Sonic Foundry N oise Reduction DirectX plug in one of our primary goals was to make the interface as easy to use as possible H owever some features may not be immediately apparent so we hope you take some time to at least page quickly through the manual T hat way you won t miss any of the N oise Reduction plug in s potential The Sonic Foundry N oise Reduction DirectX plug in actually contains four discrete plug ins N oise Reduction Click and Crackle Removal Vinyl Restoration and Clipped Peak Restoration T here are sections in the manual devoted to the use of each plug in System requirements In order to use the Sonic Foundry N oise Reduction plug in you will need the following 200 MHz processor 400 M H z recommended e 16MBRAM 64MB RAM Windows 9x or Windows NT 4 0 or later e DirectX M edia 6 0 or later included on CD ROM DirectX host app
14. activation code T he first time you start N oise R eduction the registration window appears You need to enter either the serial number or the activation code Either number will start N oise R eduction The serial number allows you to run N oise Reduction for 7 days A fter the 7 days expire N oise Reduction will time out If you purchased N oise Reduction you can receive your activation code by registering either online or by telephone An activation code is based on the Computer ID number where N oise Reduction is loaded Each computer has a unique number similar to a license plate A n activation code is created based on that unique number W hen you register N oise Reduction Sonic Foundry will generate an activation code for you Once the activation code is entered N oise R eduction will not time out it is yours Because the activation code is based on the Computer ID it is important that you have N oise Reduction loaded on the computer where you will be using it The Computer ID is automatically detected and provided to you when you install N oise Reduction Product registration The Registration dialog that appears when you start N oise Reduction allows you to quickly and easily register to get your activation code You may register via the Sonic Foundry web site or via the telephone To register follow the instructions shown in the Registration dialogs Technical support If you experience problems or have questions while us
15. analysis which results in extremely slow processing Raising the overlap factor above 75 is often sonically unnoticeable so we recommended that the default of 75 be used Capture noisepnnt Selecting this check box puts N oise Reduction into Capture mode In this mode the plug in analyzes the data for frequency content rather than applying noise reduction Use this mode to gather the initial noiseprint T Automatic capture timeout 005 to 15 seconds j1 000 You may capture a noiseprint during playback at any time but since the audio that you are hearing might not be completely synchronized with what is being analyzed you should not use this method when the segment of noise only material is small It is much safer to either make a small audio selection beforehand and to use the start of the file and the noise source W hen not making a small selection beforehand using the Automatic capture timeout control helps to set the analysis endpoint otherwise you must uncheck the Capture noiseprint check box yourself to begin processing T he Capture noiseprint check box is automatically unchecked after processing the whole audio selection aail Note T he Capture noiseprint is duplicated on the G eneral and N oiseprint pages for convenience SSS CHP 2 NOISE REDUCTION 28 OO Oonmvmvm2 Automatic capture timeout 005 to 15 sec Checking this box enables the Automatic capture timeout feature when in Capture noisepri
16. cause the algorithm to trim the ends of long decaying sounds W hen using a very large FFT size the Release speed should be higher High shelf start frequency Thiscontrol determines the frequency above which again or cut is applied to compensate or enhance the signal after the noise reduction process High shelf gain This control determines the amount of high frequency boost or cut applied to the signal after noise reduction A slight high frequency boost 3 dB often compensates for high frequency components that might get lost during the noise reduction process High shelf gain 20 to 20 cB a 3 Windowing area T his area has two controls that allow you to measure frequency analysis FFT size and Overlap T he FFT size control determines the size in samples of the analysis window and the number of discrete frequencies used during noise reduction FFT size 128 to 16 304 2048 B T he default value of 2 048 is recommended for most cases H igher numbers yield more frequency resolution at the expense of longer processing time A fter selecting anew parameter you should capture a new noiseprint NOISE REDUCTION CHP 2 27 T he Overlap control determines the amount of overlap between FFT analysis windows 6 to 90 Overlap B7 to 90 2 a J A lower setting decreases the number of distinct analysis functions performed which decreases processing time High settings allow for more
17. default setting of 0 dB does not modify the noiseprint level as in older versions of N oise Reduction ps Since the Noise bias and Reduce noise by controls are interdependent it is recommended that you adjust these controls until you find the right balance W hen using Reduction type M ode 0 setting the Noise bias too low will cause electronic sounding noise to appear on the output W hen the Noise bias is set too high the audio will sound dull since too much will be removed a Note T he Noise bias control is duplicated on the G eneral and N oiseprint pages for convenience a Attack speed This control determines how quickly the noise reduction algorithm reacts to a noiseless signal To change this setting click and drag the slider left or right or type a value into the edit box Attack speed 1 to 100 Slow rast 20 T he default value of 90 isrecommended Very low values often remove fast transients from a sound while very high values can create audible artifacts during fast attacks W hen using a very large FFT size the Attack speed should be higher CHP 2 NOISE REDUCTION 26 c Release speed This control determines how quickly the noise reduction algorithm reacts to a noisy signal To change this setting you may click and drag the slider left or right or type a value into the edit box Release speed 1 to 100 Slow C a Fast 50 The default value of 50 is recommended H igher values can
18. designed to analyze and remove background noise such as tape hiss electrical hum and machinery rumble from sound recordings Unlike a normal filter N oise Reduction can do so without removing part of the source material This function is accomplished by separating the audio into its frequency components and using a noiseprint to distinguish between unwanted noise and the desired signal Noiseprint A nolseprint is created by analyzing a portion of the recording where there is no source material such as during a silent lead in N oise R eduction stores frequency and amplitude information about the noise in the recording Once a noiseprint has been generated it can be modified by the user to determine what parts of the frequency spectrum to remove H owever this type of manual modification is not usually necessary Limitations The Noise Reduction algorithm works well to remove constant background noise Rapidly changing or erratic noise such as traffic sounds or vinyl pops are not well suited for this algorithm The Click and Crackle Removal plug in is better suited for this type of noise F or more information see C lick and C rackle Removal on page 35 H owever different types of noise can be removed by generating a noiseprint for each type A Iso in cases where the noise is of equal or greater volume level than the source material it can be difficult if not impossible to clean up without some resulting audible side effects
19. manually do the following L On the Noiseprint page set the Fit size to 6 points T he envelope will have 6 points 2 Click the Fe button to create the envelope The points will appear above the noiseprint on i the graph 3 M ove the envelope points so that they mirror the noise spectrum W e recommend that you move the envelope points below the peaks from non noisy audio and above the sloping noise spectrum 4 A djus the Noise bias control to achieve the noise reduction you want APPENDIX A TIPS AND FREQUENTLY ASKED QUESTIONS BA pS Modifying the amount of high frequency reduction with envelope points This technique is often used after you have created your own noiseprint envelopes You may raise or lower envelope points and change the amount of high frequency dulling For example to ensure that high frequencies are removed raise all the envelope points in the higher frequencies T his action creates a low pass filter effect By raising the envelope points all the way to the top you ensure that those frequencies will be attenuated by the Reduce Noise by amount Conversely to ensure that low frequencies of the spectrum are not affected lower all the envelope points the ones on the left side of the noiseprint graph In many cases however removing only high frequency noise is all that is necessary to improve the material Why am I having trouble removing hiss from amp bit files Files stored with only 8 bits pe
20. s OK button The N oise Reduction dialog will appear 3 On the Noise Reduction dialog click the Capture Noiseprint check box 4 Make atime selection in Vegas M ake sure the tracks you want to apply N oise Reduction to are assigned to the Bus with the FX 5 On the Vegas transport bar click the play button If looped play is enabled click the stop button Otherwise Vegas will continue playing the time selection A fter the noiseprint has been captured use the N oise Reduction controls to edit APPENDIX A TIPS AND FREQUENTLY ASKED QUESTIONS 60 gt MMMM Using Noise Reduction as an Assignable FX with Vegas Vegas allows you to create an FX chain so you may use chain together different effects and edit it real time The procedure below describes adding only N oise R eduction To perform N oise Reduction as an A ssignable FX in Vegas do the following L From the Insert menu choose Assignable FX The FX Plug In Chooser will appear Sonic Foundry Acoustic Mirror Sonic Foundry Graphic EG Sonic Foundry Amplitude Modulation WS Sonic Foundry Mult Band Dynamic Sonic Foundry Chorus i Sonic Foundry Mult Tap Delay Add H E Track Sonic Foundry Click Removal T Sonic Foundry Noise Gate Sonic Foundry Clipped Peak Restoration We Sonic Foundry Mose Reduction Delete sonic Foundry Distortion Te Sonic Foundry Paragraphic EQ Se Sonic Foundry Flange ak wah Fi Sonic Foundry Parametric EG Laaer Sonic Foundry
21. the beginning and end of your selection during clipped peak restoration W Crossfade edges Cross fading prevents audible clicks from being produced during restoration W ith this check box enabled you can make small selections and process the clipped sections CHP 5 CLIPPED PEAK RESTORATION gy CLIPPED PEAK RESTORATION CHP 5 49 APPENDIX a Tips and 2 A E Frequently Asked Questions ae N aie nd ia ae action answers commonly asked questions encountered when using the N oise Reduction DirectX Plug In What is the best order to run the effects when restoring old records In general you should remove the impulsive clicks and pops before running N oise Reduction on a file L Run Click and Crackle Removal and then manually remove any clicks the algorithm missed 2 Run N oise Reduction to capture a noiseprint Running multiple passes of N oise Reduction can also help Why do I hear stuttering during real time previewing If you are experiencing problems when previewing the N oise Reduction plug in in real time there are a couple of things that you can try Increase the DirectX buffering size in Sound Forge In any of the N oise Reduction plug in dialogs that have preview capabilities you can access the Preview Configuration dialog to adjust the DirectX buffering size L Right click the N oise Reduction plug in s title bar A pop up menu will appear 2 From the pop up menu choose Preview Co
22. to process the entire file ee lt lt lt Note D uring our tests with WaveLab we encountered a message box warning about a serious error If you experience the same contact Steinberg to report the issue ee E Using the Noise Reduction plug in with IQS SawPro The following procedure is explained in two parts O pening the file and Capturing the noiseprint Opening the file L From the File menu choose Open SoundFile and Add to MT 2 Choose A Cnoise WAV from the folder where you installed N oise Reduction 3 Select a region that contains only the air conditioner noise with no voice 4 Click the FX button on the track and choose DirectX Linker from the Effects Choices list 5 Double click on the DirectX Linker under the Current Patch List and select N oise Reduction from the DirectX Choices list 6 Double click on N oise Reduction from the Current Patch list The N oise Reduction dialog will display NOISE REDUCTION CHP 2 nn a 15 Captunng the noiseprint L Click the Capture noiseprint check box 2 Click Play Mark from the Remote Transport window to play the current selection A fter the first pass through the selection the plug in has captured a noiseprint and switched to process mode N oise Reduction is reducing noise in real time but only reducing the selected noise 3 Select the entire audio portion you want to process and click the Play button T he entire file will play allow
23. useful to manually remove some of the largest pops before processing Vinyl Restoration reference This section details the function of each control in the Vinyl Restoration dialog Click removal amount 1 to 20 This slider controls the amount of clicks and pops that will be removed from the selection Click removal amount 1 to 20 ee HIH q2 A setting of 1 means that only very large clicks will be removed A setting of 20 means that both very small and very large transient noise will be detected and removed W e recommend setting this control between 3 and 18 W hen the settings is below 3 clicks are harder to detect and settings above 18 may cause false click detection Reduce noise by This slider determines the amount of noise reduction that will be applied to the sample 0 dB represents no noise reduction and 100 dB represents the maximum possible noise reduction Reduce noise by Off to 100 dE Je A 10 04 W e recommend values between 6 and 20 dB to prevent removing too much sound or creating artifacts CHP 4 VINYL RESTORATION LY Affect frequencies above 100 to 10 000 Hz Thisslider sets the bottom frequency at which noise reduction is used Only frequencies at and above this setting are affected by noise reduction Affect frequencies above 100 to 10 000 Hz HH 2 500 If noise reduction is removing too much high frequency content you can raise the start frequency or lower the Reduce noise by set
24. using 59 new file with processed output 61 processed sound new file 12 tipsand FAQ 59 61 using N oise Reduction with 11 Vinyl restoration 41 44 limitations 41 removing clicks 43 removing surface noise 42 using 41 Vinyl Restoration reference 43 A ffecting frequencies above 44 Attack speed slider 44 Click removal amount 43 N oise floor slider 44 Reduce noise by slider 43 Release speed slider 44 Vinyl restoration vs Click and crackle 62 INDEX
25. waveform The Click and Crackle Removal plug in can remove these types of noise High shelf The Noise Reduction plug in comes with an EQ section that can compensate for high frequency loss during the noise reduction process T he H igh shelf will boost all frequencies above the set cutoff frequency Hertz Hz The metric unit for frequency or cycles per second Interpolate To interpolate is to make a logical guess as to what happened between two points in time The Click and Crackle Removal plug in can use interpolation as one of its means to remove clicks and glitches GLOSSARY APPENDIX B I ES Noiseprint The noiseprint isan FFT analysis of the noise in your recording The N oise Reduction plug in uses the nolseprint to determine the envelope it then uses to remove the noise Overlap During the FFT analysis of the noise the Overlap control determines controls the amount of overlap between frequency analysis windows Overlapping allows for more accuracy of the analysis Some overlap is necessary for accurate frequency analysis however it isnot recommended that you increase the overlap past 75 The processing time will greatly increase but the quality will not increase proportionally Residual Output The residual output of the N oise Reduction plug in isthe sound data that is being stripped out of the sound file Listening to this output can be beneficial to determine how much of the source material is being thrown ou
26. 29 Noiseprint graph This graph displays amplitude versus frequency of the analyzed noise It contains the noiseprint envelope which can be manually adjusted for specific applications Amplitude 1225 2450 3 675 4 300 6 125 7 250 8 575 3800 11 025 Hz Frequency Keep residual output Fit size 2 to 1 024 points 512 Noiseprint envelope Envelope points are used to model the noiseprint and are editable The envelope not the noiseprint graph is used in the algorithm when separating the noise signal from the source any signals below the envelope are treated as noise Therefore the envelope contour should be above the noiseprint graph if the desired frequency noise isto be removed To move all the envelope points up or down use the Envelope Amplitude control F or more information see M anually adjusting envelope points on page 19 CHP 2 NOISE REDUCTION 30 Envelope amplitude U se the up and down arrowsin the lower left hand corner of the N oiseprint page to move the envelope points up and down the amplitude axis 7 a nir i jiv fi z Wee a iii a 1225 2 450 3 675 4 900 6 125 7 350 2 575 3 800 11 025 Hz T Keep residual output Fit size 2 to 1 024 points 512 Clicking the buttons increases or decreases the envelope points by 1 dB Since any signal that falls under the envelope is treated as noise by the noise reduction algorithm moving the envelope controls up and down has a strong effect on
27. Affecting frequencies with envelope points You may use envelope points to eliminate high frequency noise and preserve the low frequency portion of the audio by doing the following L Select all of the envelope points below 1000 Hz Unaffected frequencies 2 Drag the points down so that N oise Reduction will not affect those frequencies Or to ensure that high frequencies will be attenuated raise the envelope points above the cutoff frequency Cutoff frequency 145 1697 1 979 2261 2 543 Hz Frequencies being attenuated Note If the envelope point is below the noiseprint level the audio at that frequency will not be affected C onversely if the envelope point is above the noiseprint level the audio at that frequency will always be reduced by the Reduce noise by slider setting EN Resetting and fitting envelope points At any time you may reset the envelope to its default position by clicking the button Clicking the ft button again will reapply the envelope to the current noiseprint CHP 2 NOISE REDUCTION 22 Zooming into the noiseprint W hen making manual adjustments to the envelope it is usually necessary to zoom into the graph to better see what frequencies you will be affecting Zooming can be accomplished in several ways e Click on the noiseprint graph and draw a box around the area you wish to zoom W ith that area selected right click on the noiseprint graph to display a pop up menu
28. Reduction type Mode O Mode 1 Mode 2 or Mode 3 T he Reduction drop down list appears on both the General and N oiseprint pages It allows you to select among four different internal modes or algorithms to reduce the noise In general M ode 2 the default setting will work well in most cases H owever it is always worthwhile to test all modes and select the mode that gives you the best results Reduction Mode 3 The four Reduction modes each remove broadband noise in a slightly different manner A modes use the noiseprint to determine what to remove from the audio but interpret the noiseprint and remove noise using different algorithms We recommend listening to the various effects each Reduction type has on the output sound T he Reduce noise by and Noise bias controls behave differently for each mode so varying the three parameters while previewing will give you a good idea of how each mode affects sound N oise reduction is dependent on your source material so do not be alarmed if two modes sound identical in some cases e Mode0 usesthe same algorithm as the original version of N oise Reduction It is excellent for very low level noise and can often reduce the highest amount of noise from a source H owever it is most prone to flange like side effects and squeaky artifacts when reducing too much noise or when the Noise bias is set too low e Model issimilar to Mode 0 but is less likely to produce artifacts this mode rem
29. al is subject to change without notice and does not represent a commitment on the part of Sonic Foundry T he software described in this manual is provided under the terms of a license agreement or non disclosure agreement The software license agreement specifies the terms and conditions for its lawful use No part of this manual may be reproduced or transmitted in any form or by any means for any purpose other than the purchaser s personal use without written permission from Sonic Foundry Inc Sonic Foundry and N oise Reduction are trademarks of Sonic Foundry Inc The brands and products named here are the trademarks or registered trademarks of Sonic Foundry its affiliates or their respective holders 1999 2000 Sonic Foundry Inc Table of Contents IAI OGUCHON cca tas enro Oed eee eee 5 Reading the Manual anaana annen eee eee eee et ee eens 5 System requirements 2 si0 sodas See eee ote ee dee EW ERS we De ee eee 5 INStANQUOM 2suriw he ahd bod aedawdowd we dak dare aun eet aaa eet eae ues Oke 6 Serial number and activation COdeE 1 ees 7 Product registraton suans sannana obese eae Cae we 7 Teen Cal SUDDOE eed titans ata ee eee ed ee See 7 WED Ste SUD DONE dase wis aseara i chawteans du atwiehu de ae wie eee ee aes 7 Pox SUPPONE Ga ciewcewoe wit ete ewes eet wee eae el ed doe ak aeons wie ate le the 8 Telephone support 2 4 552 05a oe cae Se See Reeder eeieed ceeded weeded 8 Noise Reducton 0 c
30. all unwanted tracks 2 From the File menu choose Save As The Save A s dialog will appear 3 From the Save as file type choose the file format that you want to use 4 Type a file name and click the OK button to save the mix to a new file Note You may also create a new processed track by muting all unwanted tracks and See choosing Mix to new track from the Tools Mix to Preview Cir Shift M menu ren hh sound Forge Ette 7 _ lt lt FT NOISE REDUCTION CHP 2 a Using Noise Reduction with Cakewalk Pro Audio L 2 3 4 O pen the audio track you would like to processinto an A udio View from the M ulti track view select A udio from the right click pop up menu Press the key and click and drag to select a region of time in one of the tracks which contains the background noise C onsult the C akewalk Pro A udio documentation Right click to open a pop up menu then choose Sonic Foundry Noise Reduction from the Audio Effects menu Click the Capture noiseprint check box click A udition and then click Stop as soon asthe audition starts to play Click the Cancel button to exit from the N oise Reduction dialog 6 Select the audio that you would actually like to remove the noise from inside A udio View usually the entire clip C hoose Sonic Foundry Noise Reduction from the Audio Effects menu 8 Click the Capture noiseprint check box again to disable it 9 A djust settings as desi
31. ble in the Sound Forge Audio Plug in Chainer This issue is a Know bug in the Sound Forge A udio Plug in Chainer The N oise Reduction presets created outside the chainer will not be listed H owever any presets that you create from within the A udio Plug in Chainer will be saved T his issue will be addressed in future versions of Sound Forge TIPS AND FREQUENTLY ASKED QUESTIONS APPENDIX A 59 Vegas The following section relates to tips and questions as they apply when using N oise Reduction with Vegas Using Noise Reduction as a Bus FX with Vegas To perform N oise Reduction asa BusFX in Vegas do the following L Click on the Bus FX control T he Plug In Chooser dialog will appear Bus Plug In Chooser EES OF Sonic Foundry Acoustic Mirror Sonic Foundry Graphic EG Cancel Sonic Foundry Amplitude Modulation WS onic Foundry Mult Band Dynamic C FX Chains Sonic Foundry Chorus We Sonic Foundry Mult Tap Delay Add HE Track Sonic Foundry Click Removal FE Sonic Foundry Noise Gate Sonic Foundry Clipped Peak Restoration lhgsfalg eg aeea Tels ata halal Delete Sonic Foundry Distortion SS onic Foundry Paragraphic EQ Save As Sonic Foundry Flange ah wah WS Sonic Foundry Parametric EL Sonic Foundry Gapper Snipper WS Sonic Foundry Pitch Shift Sonic Foundry Graphic Dynamics WS onic Foundry Reverb of Noise Reduction 2 2 Add the N oise Reduction plug in asa BusFX by double clicking and clicking the Bus FX Plug In Chooser
32. castanets brushes on high hat cymbal blocks maracas or claviers and numerous others you will see that their sound waves actually look very similar to clicks but last for a slightly longer time If your material has these kinds of percussion sounds the size setting might need to be about 0 8 ms to protect them H owever when this setting is set to alow value you will often have to manually remove larger pops that are missed by the algorithm You will have choose a setting based on how much lossis acceptable and how much time you can spend manually de clicking these missed clicks Noise level Low Medium High The Low and Medium noise level settings split the audio input into noise and non noise portions and clicks are removed from only the noisy part of the audio This often results in fewer artifacts H owever Low and Medium settings will increase usage of the computer s processor that may result in not being able to preview in real time Noise level C Low Medium High W hen set to High the algorithm will not try to split the audio into noisy and non noisy parts before removing clicks In addition the High setting uses less of the computer s processor So we recommend the High setting for slower computers H owever some source material especially low voice and horns can sometimes cause the detection algorithm to misinterpret data and results in audible artifacts At Low and M edium settings the audio input is split into n
33. d processed sound Creating a new file with processed output You can isolate the processed mix in Vegas for future projects by doing the following L Mute all unwanted tracks 2 From the File menu choose Save As The Save A sdialog will appear 3 From the Save as file type choose the file format that you want to use 4 Type a filename and click the OK button to save the mix to anew file ee Note You may also create a new processed track by muting all unwanted tracks and Tae EET choosing Mix to New Track from the Tools Mix to Preview ChlsShifteM S menu Open iSound korge etre 7 _ ee F APPENDIX A TIPS AND FREQUENTLY ASKED QUESTIONS 62 y Click and Crackle Removal The following section relates to tips and questions as they apply when using Click and Crackle Removal Choosing between Vinyl Restoration and Click and Crackle Removal The Vinyl Restoration and the Click and Crackle Removal functions are useful to solve similar problems Generally Click and Crackle Removal will perform better at removing the impulsive noise from both vinyl and old 78 s The reason is that Click and C rackle Removal can be tuned for fewer artifacts If surface noise remains use the N oise Reduction plug in to remove it The Vinyl Restoration function is simpler to use for removing surface noise and clicks H owever Vinyl Restoration has difficultly removing smaller clicks and crackling and may remove percussi
34. e 10 to 20 dB range by processing the file getting a new noiseprint and then processing the file again Two passes of 20 dB will usually give you better results than a single pass at 40 dB Using the Attack speed and Release speed sliders T he Attack speed and Release speed sliders determine how quickly the plug in reacts to changes in noise level Attack speed 1 to 1001 Slow a rast 50 Release speed 1 to 100 Slow C aN Fait 50 T he Attack speed determines how fast the noise reduction algorithm reacts to a noiseless signal T he default value is recommended Very low values often remove fast transients from a sound while very fast values can create audible artifacts during fast attacks W hen using a very large FFT size the Attack speed should be higher T he Release speed determines how fast the noise reduction algorithm reacts to a noisy signal T he default value is recommended H igher values can cause the algorithm to trim the ends off of long decaying sounds W hen using a very large FFT size the Release speed should be higher To change either of these settings you may adjust the slider left or right or type a value into the edit box NOISE REDUCTION CHP 2 r oF Dy Compensating for lost high frequencies A high shelf filter is included to brighten the sound after removing noise Frequently noise reduction decreases the high frequencies in the source material Enabling the high shelf filter and boosting the high fre
35. ece ee eens 9 NOISCOMINGS 4 aioe a bitte atacand a Saa wears Gnd 9 MANU OMS ects a tng ine Sire bie ie S E E S TE A hae ee eek este ee eae 9 Removing noise from a recording cece eee ee ees 10 Using Noise Reduction with Sound Forge 0 cece eee eee eee 10 Using the Noise Reduction plug in with VegaS ccc eee eee eee 11 Using Noise Reduction with Cakewalk Pro Audio 0002 c eee eee 13 Using Noise Reduction with Steinberg WaveLab 000 cee eee eee 13 Using the Noise Reduction plug in with IQS SAWPro 00 eee eee 14 TABLE OF CONTENTS 2 DWwWN iR Operation basics General page 00 ccc eee eee eee eee 15 Using the Reduce noise by slider 1 0 eee eee 16 Using the Attack speed and Release speed sliders 2 00 c ee eee ees 16 Compensating for lost high frequencies 0c c cee eee es 17 Adjusting the precision of frequency analySiIS 00 cece eee eee 17 Seeing the removed NOISE 1 eee eee eee eens 18 Noiseprint modification and navigation 0 0 eee ee ees 18 Changing the fit size 26054 cbawtnweewsionseseadsavesobes Gans bwebes ek debi es 19 Manually adjusting envelope points 2 000 ccc eee ees 19 Zooming into the NOISEPNNt 6 eens 22 Noise Reduction reference 0 eee eens 23 Ee Sie e tects tbe dec deed eaten ewe ded tees ese eee ree Seu ree reed 23 Noiseprint PAGE s a ee eee eee eee eens 28 Noiseprint Sh
36. gh it is likely that you will remove part of the source material and generate flange like artifacts If the points are too close to the noiseprint some of the noise may not be removed It isimportant to remember that for the noise to be removed the envelope contour must be above the noiseprint CHP 2 NOISE REDUCTION 20 r The Noise bias control achieves similar results as manually modifying envelope points Noise bias dB C gy foo For some applications it may be necessary to move individual or groups of envelope points For example if your source material has a lot of frequency content in common with the noise reduce the noise only in the places with little overlap common with speech and tape hiss noise Moving one envelope point To move an individual point click and drag one of the square envelope handles Move one envelope point aa ee ri eA a since ta EER 20 442 5 103 5 470 5 531 6132 6 553 6 914 Tero T636 7 997 Hz Moving a group of envelope points To move a group of points click and drag a box around the envelope points you want to select If you see the magnifying glass icon right click until you see the cross hairs icon Selected envelope points will appear in red A fter you have selected a group of points you may click and drag the entire group Move a group of envelope points 442 5 103 5 470 5 531 6132 6 553 6 914 fers T636 7 997 Hz NOISE REDUCTION CHP 2 21
37. his method TIPS AND FREQUENTLY ASKED QUESTIONS APPENDIX A 55 Creating noiseprint envelopes manually You may manually create noiseprint envelopes T hisfeature used properly can be a powerful technique U se this technique when there are no sections with noise only material T he following procedure is for practice and uses minimal settings to help you understand how this feature works A s you get accustomed to creating your own envelopes you may create and work with custom envelopes with 6 points that will approximate the noise spectrum A fter getting a nolseprint if the source has non noisy material like voice in it you will be able to see the peaks in the graph corresponding to harmonic audio In many cases the noise follows a constant decreasing linear slope and does not contain peaks ve a Aa vsti PN uman 1225 2 450 3 675 4 900 6 125 7 350 2 575 3 800 11 025 Hz The very small dips and peaks can be usually ignored when creating a noiseprint shape but the very large peaks are usually part of the material that you want to keep Your main goal is to have the envelope points be below what seems like the peaks from the non noisy audio and above what looks like the sloping noise spectrum In many cases you can get away with a noiseprint of just 2 points with the right hand side point lower than the left hand side one depending on the amount of high frequencies content in the noise To create a noiseprint envelope
38. how much noise and possibly source signal is removed If too many sound artifacts are generated during the process lowering the envelope points will keep the desired signal from being altered M oving all of the envelope points up is the same as increasing the Noise bias Fit size This control determines the number of points used to generate an envelope that matches the current noiseprint W hen trying to remove a very narrow band signal a large Fit size will allow the Fit function to more closely match the contour of the analyzed noise T he Fit size is limited to a maximum of 2048 points W hen using a FFT lessthen 2048 the FFT size will be the maximum Fit size setting Fit button Click the 7 button to generate an envelope of the noiseprint that is used for noise reduction Envelope points are generated 6 dB above the noiseprint when using Average for the noiseprint calculation mode and 1 dB above when using Peak You can move the points further above or closer to the noiseprint by using the up and down arrows at the bottom left hand corner of the dialog The number of envelope points generated is specified by the Fit size control NOISE REDUCTION CHP 2 31 Reset button Click the button to reset the envelope points Noiseprint shortcut menu Right clicking or pressing Shift F10 displays a pop up menu on the noiseprint graph The following options are available Zoom Selection Zoom Ou
39. igating through the nolseprint while zoomed in at a high zoom factor To switch into Grab Pan mode right click the noiseprint and choose Grab Pan from the pop up menu You will not be able to make selections or adjustments to envelope points while in this mode To switch out of Grab Pan mode right click on the nolseprint and choose Grab Pan again from the pop up menu Noise Reduction reference This section details the function of each control in the N oise Reduction dialog box General page T his page contains the most frequently used controls of the N oise Reduction plug in Reduce noise by T he Reduce noise by slider is at the top of the dialog on both the G eneral and N oiseprint page This control is used most often Reduce noise by Off to 100 dE M fH 62 8 T his slider controls the total gain reduction applied to the noise For example a value of 6 dB means that a gain of 6 dB 50 is applied to the background noise A 0dB value means no noise is reduced while a 100dB value means maximum noise reduction is applied Settings of 10 to 20 dB usually provide good results on a single pass but you may use higher settings with some types of source material A higher number may improve noise reduction but may add unwanted artifacts to the material you wish to keep Start with a setting of 12 dB and adjust the Reduce noise by and Noise bias controls until you are satisfied CHP 2 NOISE REDUCTION 24 gt vO OO
40. ing N oise Reduction there are a few ways to get the information that you need from Sonic Foundry web site support email support fax support and telephone support Web site support Visit our W eb site at www sonicfoundry com support You will find technical information reference information program updates tips and tricks and a Frequently A sked Questions FA Q archive Email Support Send your questions or comments by using the Technical Support R equest form found on our web site www sonicfoundry com support SupportM ail asp O ur Technical Support Department will respond to you within 36 business hours CHP 1 INTRODUCTION 3 gt oo Fax support Send your questions or comments via fax 24 hours a day at 608 250 1745 You will receive a response within 36 business hours Telephone support O ur technical support representatives are available M onday Friday from 7am to 10pm CST at 608 256 5555 Before You Call Support Before you contact our technical support department we ask that you do the following e Check to see if your question may be answered in the manual or online help For more information see Tips and Frequently A sked Q uestions on page 49 e Useatelephone that is near the computer where N oise R eduction is installed e Make sure you have registered the product INTRODUCTION CHP 1 9 eee Noise Reduction 5 on a 5 o wW pene The _ Foundry N oise Reduction plug in is
41. ing you to change parameters and simultaneously listen to the results 4 From the File menu choose Save EditList File As to save the processed file Operation basics General page Once you have obtained a noiseprint the hard part is done and for most applications you will not have to capture another noiseprint until you are ready to process a different file The three most important processing controls are the Reduce Noise by slider the Reduction type drop down list and the Noise bias slider Reduce noise by Off to 100 dB n i e282 Reduction Mode 3 Moise bias dB ay 0 0 In most cases using the default presets and slightly adjusting these three controls will give you excellent results H owever we encourage you to try the many adjustment sliders available like the FFT Size or Release Speed CHP 2 NOISE REDUCTION 16 gt Using the Reduce noise by slider T he Reduce noise by slider is the control that you will use the most Reduce noise by Off to 100 dE SSS J fH 62 8 Thisslider controls how much the plug in will reduce the noise by A higher number will do a better job of reducing the noise but will most likely add unwanted artifacts to the material you wish to keep Settings of 10 to 20 dB will usually provide the best results on a single pass but depending on the source material you may be able to use higher settings A good strategy on stubborn noise isto do multiple passes of N oise Reduction at th
42. ion relates to tips and questions as they apply to N oise R eduction There are too many controls in Noise Reduction where do start A Ithough there are many controls in N oise Reduction you can get great results if you learn how to use 4 of them the Reduce noise by Reduction Noise bias and Capture noiseprint controls T hese controls appear on both the General and N olseprint pages To start use the default preset Default for fast computers Reduce noise by Off to 100 dE f m 62 8 Reduce noise by slider Noise bias dB C k gy foo Noise bias slider Reduction Mode 3 E Reduction 4 Capture noiseprint o General 5 Motseprint Below is the basic N oise reduction process L Select the noise only section using your audio editor 2 Enable the Capture noiseprint check box 3 Start the processing by pressing Preview in Sound Forge or Play in other applications 4 Select the entire audio file make sure the Capture noiseprint check box is unchecked and start previewing again 5 Use the Reduce noise by and Noise bias work controls until you get the results you want SY Note M odifying the Reduction type can further improve the output quality but is not always necessary eeEeEeEeEeES vVv_ APPENDIX A TIPS AND FREQUENTLY ASKED QUESTIONS BQ eS Which Noise Reduction mode should I use In general M ode 0 will sound the cleanest but can sound unnatural and electronic whe
43. ise Reduction with 14 K K eep residual output defined 18 62 K eyboard shortcuts magnification 33 navigation 32 Selection 32 L Low frequency rumble removing Click and Crackle 39 M M ax click size slider 38 N N oise bias defined 25 N oise floor slider 44 N oise level Click and Crackle 38 N oise R eduction Assignable FX Vegas 60 Assignable FX pre fader function Vegas 61 basics 15 BusFX in Vegas 59 control basics 51 general page 15 installation 6 modes defined 52 registration 7 tipsand FAQ 51 54 using IQS SawPro with 14 with Cakewalk Pro Audio 13 with Sound Forge 10 with Steinberg WaveLab 13 with Vegas 11 i N oise Reduction presets unavailable 58 N oise Reduction reference general page 23 Attack speed slider 25 Capture noiseprint 27 Capture time out 28 FFT size 26 H igh shelf gain slider 26 H igh shelf start frequency slider 26 Keep residual output 28 N oise bias slider 25 Overlap slider 27 R educe noise by slider 23 Reduction type 24 Release speed slider 26 N oise Reduction reference noiseprint page 28 Envelope amplitude 30 Envelopes 29 Fit button 30 Fit size 30 N oiseprint calculation mode 28 N oiseprint graph 29 Reset button 31 Shortcut menu 31 N oiseprint calculation mode 28 capturing on the fly 52 creating envelopes manually 53 graph 29 keyboard shortcuts 32 shortcut menu defined 31 without N oise Reduction 52 zoo
44. lication Sound Forge 4 5 for example e Windows compatible sound card e VGA display e CD ROM drive for CD based program installation 5 MB hard disk space for program installation CHP 1 INTRODUCTION 6 gt ee i Installation The install utility SETU P EXE located on the setup CD ROM creates any necessary directories and copies all files required by the N oise R eduction plug in The Noise Reduction plug in requires Microsoft DirectX M edia Runtime 6 0 installed on your computer The installation program will notify you if DirectX M edia Runtime is not detected You will be prompted to install it from the N oise Reduction plug in CD ROM Windows 9x and NT 4 0 L Insert the N oise Reduction CD ROM TheN oise Reduction Installation screen appears if CD ROM A utoPlay is enabled Ifthe CD ROM AutoPlay is disabled click on the button and choose Run In the Run window that appears type the CD ROM drive s letter and add setup exe Click the OK button to start the installation 2 Click Install Software The installation process begins 3 Follow the screen prompts and enter the necessary information when required e Usethe button to continue the installation e Usethe button to suspend the installation and review previous screen prompts e Usethe button to terminate the installation process 4 At the last screen prompt click the button to conclude the installation INTRODUCTION CHP 1 See Serial number and
45. licks and pops manually in Sound Forge You may use either the Click and Crackle Removal plug in or the Pencil tool in Sound Forge to manually remove clicks and pop noise in an audio file Using Click and Crackle Removal plug in To remove a click manually in Sound Forge do the following L Select approximately 15 milliseconds of the audio s click noise M ake sure the click is centered in the selection 2 From the DirectX menu choose Click and Crackle Removal The Click and Crackle Removal dialog will appear Audio Plug In Chainer Microsol ft Audio Decoder Sonic Foundry Acoustic Mirror oundry Amplitude Modulation Sonic Fi Sonic Fi Sonic F i Sonic Foundry Cli Sonic Fi Sonic Fi oundry Vinyl Restoration 3 A djust the Sensitivity control to a high setting and the Max click size control to 3 0 ms 4 Click the Remove low frequency rumble check box to disable it TIPS AND FREQUENTLY ASKED QUESTIONS APPENDIX A 57 5 Right click below the Name field to display a pop up menu Sonic Foundry Click Removal ACnoise way 12 xi Name Untitled x Pre roll Post roll Cancel a o 15 nt Select Curre Hel Ci Select All Data Se 4 ee jm 3 0 Save As C Low C Medium High IV Remove low frequency rumble So ul ic Preview x Buffers to process per second 1 to 32 f 2 g Lo Total playback buffers 2 to 16 fj Cancel
46. line on top of a waveform T he resulting sound depending on the source and the severity of the overload will often add a harsh distorted quality to the audio usually making it unusable Clipped Peak Restoration recovers the signal lost due to clipping and reduces the harsh distortion Clipped Peak Restoration rounds the tops of clipped peaks and applies peak limiting to the area immediately surrounding the audio clip Non clipped audio is not affected A Ithough this plug in is designed to be used on the entire file without affecting the source audio it can also be used on smaller selections of the audio file rm __ s pbspsospootctttttt__cH Note C lipped Peak Restoration should only be used for material in which clipping is minimal H eavily distorted material where most peaks are clipped is often not salvageable pen CHP 5 CLIPPED PEAK RESTORATION i Using Clipped Peak Restoration Sonic Foundry Clipped Peak Restoration ACnoise way Sonic Foundry Clipped Peak Restoration ACnoise way Untitled Untitled 3 dB with limiter E dE no limiter No Attenuation limit clips Default all parameters Hame Attenuation Limiting f Enable Post Limiter to 24 dB Crossfade edges Cd Geeta Clipped Peak Restoration CPU 24 bit processing M Create undo Selection 00 00 00 000 to 00 00 04 986 00 00 04 986 ae Channels Mono 2 or In most cases you should use the default settings f
47. ll almost always need to be adjusted for the specific material you are processing T he Reduce noise by Affect frequencies above and Noise floor sliders are the three main controls used in achieving the noise reduction you prefer H owever you will need to compromise between how much noise is reduced and how much high frequency is lost To remove surface noise do the following L With the Reduce noise by value set to 8 dB and Affect frequencies above set to 2000 Hz start raising the Noise floor slider until the high frequency noise is noticeably reduced Sonic Foundry Yinyl Restoration ACnowe war Name Untitled AE Click removal amount 1 to 20 Reduce noize by Off to 100 dB Affect frequencies above 100 to 10 000 Hz Attack speed 1 to 20 Release speed 1 to 20 Noize floor Inf to 40 dB Vinwl Restoration Cancel o e 12 Help d a Fs 10 08 i maf 250 Save Ag Be 7 7 c 7 Preview c a 0 008 Bypass W Real time CPU 24 bit processing M Create undo Selection 00 00 00 000 to 00 00 04 986 00 00 04 986 eee Channels Mona 2 Increase or decrease the amount of noise reduction with the Reduce noise by slider Reduce noize by Off to 100 dB od EA 10 08 N o reduction will occur if you set the control to 0 dB Setting this value much higher than 15 dB can cause undesirable artifacts and too much high frequency loss 3
48. lly Zoom selection in full vertically Zoom out fully Cancel any move or magnification operation When the selection rectangle is visible it toggles between A Point selection selects point in bounding rectangle B Horizontal magnification C Vertical magnification D Horizontal and vertical magnification If selection rectangle is visible it toggles between selection and magnification operations or it displays shortcut menu Zoom out fully when not on envelope point NOISE REDUCTION 34 y NOISE REDUCTION CHP 2 35 CHAPTER E r j r 4 a Ea Click and Crackle Removal Clicks and pops are often found in older recordings or are the result of bad splice editing T hey can be detected visually as sharp glitches in the normal curve of a waveform Click crackle The Click and Crackle Removal function finds these glitches and automatically replaces them to minimize their audibility Limitations Theclick and crackle removal algorithm is designed to find and remove pops and clicks not broadband or long scratch noises A fter removing any clicks and crackles it is suggested that you use the N oise Reduction function to remove other background noise For more information see N oise Reduction on page 9 CHP 3 CLICK AND CRACKLE REM OVAL 36 Using Click and Crackle Removal The primary way to use the Click and Crackle Removal function is to select a region in a sound file and have the functio
49. lug in uses the DirectX M edia Runtime 6 0 A PI Because DirectX M edia Runtime 6 0 is a standard A PI a DirectX plug in can be used in any application that supports it APPENDIX B GLOSSARY 64 gt _ Dynamic noise N oise which variesin amplitude and frequency content over time T hese noises such as cars driving by cannot be effectively eliminated by the N oise Reduction plug in Fast Founer Transform FFT By breaking up a waveform into small windows and analyzing them it is possible to display the waveform as single frequency components with discrete amplitudes W hen you get a noiseprint in the N oise Reduction plug in you are performing an FFT analysis on the noise Fit Size The number of discrete points that the N oise Reduction plug in will operate on Generally the greater this number the more precise the algorithm can function FFT Size W hen capturing the noiseprint this isthe number of samples contained in each analysis window T he higher this number the more precise the analysis H owever after 2048 samples the amount of quality gained versus the added amount of processing time is low Frequency The number of times something happens in a particular time interval In the measurement of sound frequency is defined as cycles per second or H ertz H umans perceive frequency as pitch T he higher the frequency the higher the pitch and vice versa Glitch A ny unpleasant garbled grungy sound in your
50. ming view 22 23 N oiseprint page 18 28 changing Fit Size 19 envelope points 19 navigating 18 Non DirectX plug ins using 58 N umbers serial 7 O Overlap defined 17 Play back stuttering 49 Plug in sequence for restoration 49 Post limiter defined 47 Pre fader function Vegas 61 Processors 50 Real time preview stuttering 49 Recording removing sound from a 10 R educe noise by slider 16 43 defined 23 Reduction types defined 24 Registration 7 R elease speed slider 16 44 R elease speed defined 16 Removed noise seeing 18 Removing noise 10 Reset button 31 Restoration plug in sequence 49 Sensitivity slider 37 Serial N umber Title page Sound Forge A udio Plug in Chainer 55 clip restoration 58 noise removing manually 56 noise removing with pencil tool 57 non DirectX plug ins using 58 tipsand FAQ 55 58 using N oise Reduction with 10 Steinberg W aveLab capturing noiseprint 14 using N oise Reduction with 13 Surface noise removing 42 INDEX iv System Requirements 5 W T Web site technical support 7 Technical support 7 W indowing area email 8 ex FFT size 17 26 telephone number 8 Overlap 17 27 web site 7 Technical support Title page Tipsand FAQs 49 62 Troubleshooting flange type artifacts eliminating 54 stuttering during play back 49 U US contact information Title page V Vegas Assignable FX using 60 BusFX
51. n detect and try to automatically remove all clicks found Sonic Foundry Click Removal ACnoise way Hame Untitled Hame Untitled Basic setting for slower computers Default for 8 APM recordings Default for vinyl recordings For manually fixing small selections Good for high frequency crackling Removes lots of crackle Safer for percussive sounds Ver conservative Noise level C Low Medium High Delete Presets EO P Eco As you will discover the presets will provide great Keep residual output Bypass results without control adjustments The controls M Realtime are included for making minor adjustments and for individuals who like to experiment Cancel Sensitivity 1 to 20 Click shape 1 to 5 Help Mas click size 0 1 to 3 0 i A Click Removal i CPL 24 bit processing M Create undo Selection 00 00 00 000 to 00 00 04 986 00 00 04 986 Seleen Channels Mona Several presets are supplied to get you started In general either the Default for 73 RPM recordings Or the Default for vinyl recordings preset is the best starting point if you have a fast machine 200 M H zor higher T he Basic setting for slower computers preset should be used as a starting point for real time preview if you experience stuttering during playback In some host applications you may be able to disable real time preview if you continue to experience performance problems The Click and Crackle Rem
52. n the noise level is high M ode 3 will not completely remove the noise but will sound the most natural M odes 1 and 2 area compromise between M ode 0 and M ode 3 You may switch between the modes while previewing in real time and decide which one works the best for your needs W hen trying the different modes the Noise bias control should remain near 0 dB when using M ode 0 but it should be raised or lowered for the other modes to find the right balance Applying Noise Reduction without a noisepnnt In some cases you may use Reduction M ode 2 and 3 without having a noiseprint by doing the following L Choose the Default All for fast computers preset from the Name drop down list 2 Preview without selecting the Capture noiseprint check box 3 U se the Noise bias control with large values that are either positive or negative and vary the Reduce noise by control to find an optimal setting W e recommend setting the Reduce noise by control to 10 dB or less since you will probably be removing a bit of high end frequencies It is common to get good results with minimal control adjustments Capturing a noiseprint on the fly You may capture a noiseprint during playback by enabling and disabling the Capture noiseprint check box H owever the audio that you are hearing might not be completely synchronized with what is being sent to the plug in internally W hen the segment of noise only material is small we recommend not using t
53. nfiguration T he Real Time Preview Configuration dialog will appear Or right click near the Name field and choose Configuration from the pop up menu to display the Real Time Preview Configuration dialog APPENDIX A TIPS AND FREQUENTLY ASKED QUESTIONS Move Close Alt F4 Reset All Save Current Real Time Preview Configuration Buffers to process per second 1 to 32 fi 2 Total playback buffers 2 to 16 fe Cancel Do not allow in place buffer size increases Help Preview Configuration k Sonic Foundry Clipped Peak Properties Pre rall Fost roll V Use plug in s requested mininimum buffer size a l Crossfade edges 1 to 1 000 mst fic _ Beset IF plug in extends length f ngert tail fe Mis tail f gnore tail 3 Lower the Buffers to process per second Increase the Total playback buffers or a combination of the two settings to reduce gapping Select All Data Reset All Save Current Configuration Buffers to process per second 1 to 32 i 2 Total playback buffers 2 to 16 fe Use a faster processor with fast floating point arithmetic A sof this printing some high speed processors lack speed when it comes to floating point arithmetic It is recommended that you use a processor that is optimized for floating point arithmetic TIPS AND FREQUENTLY ASKED QUESTIONS APPENDIX A 51 Noise Reduction The following sect
54. nt mode W hen enabled the plug in will switch out of Capture mode after the specified amount of time T hisis useful when you only want to analyze a certain amount of time after starting a preview Automatic capture timeout 005 to 15 seconds 1 000 To use this control make sure that there is a segment at the start of the audio selection containing only noise For example if you have only 0 75 seconds of noise at the start of the file set the Timeout to 0 75 seconds T his will prevent the algorithm from using non noisy material as the noiseprint r aaa Note T his control is duplicated on the G eneral and N oiseprint pages for convenience EN ae Keep residual output W hen this check box is checked the detected noise is the output instead of the de noised signal Keep residual output This check box allows you to listen to the audio material that is removed during normal processing T his feature can be very helpful in determining how much of the good signal is being affected by your settings Turn this off when you want to remove the noise from the signal Noiseprint page The Noiseprint page contains controls for manipulating and navigating the noiseprint In most cases these controls will not need to be adjusted Noiseprint calculaton mode This control determines if the noiseprint graph displays the peak value or the average value of the selected noise Nolseprint Average Peak NOISE REDUCTION CHP 2
55. oise and non noise portions and clicks are removed from only the noisy part of the audio T his often results in fewer artifacts H owever CPU usage will increase and some users will not be able to preview in real time CLICK AND CRACKLE REM OVAL CHP 3 39 Remove low frequency rumble W hen enabled the very low frequencies below 30 H z will be removed T his often helps the detection algorithm work more efficiently IY Remove low frequency rumble W hen enabled the output waveform can look different from the original T his difference is due to the large amounts of low frequency noise present in older recordings generated from slightly warped discs Removing this noise is usually completely inaudible and prevents your speakers from reproducing sounds you can not hear W hen removing clicks from a small selection one second of audio make sure to disable this function to more easily preserve waveform continuity at the endpoints Keep residual output W hen enabled only the sound being removed is audible T his is useful for determining how accurately the detection algorithm is performing or whether the algorithm is removing any of the sound that you want to keep M Keep residual output CHP 3 CLICK AND CRACKLE REMOVAL oe CLICK AND CRACKLE REMOVAL CHP 3 41 CHAPTER Vinyl Restoration 5 Sonic Foundry Vinyl Restoration is designed to remove both impulsive pops and clicks and broadband surface noi
56. or the Clipped Peak Restoration presets No attenuation limit clips Only the clipped peaks are attenuated or limited after fixing 3 dB with limiter Reduces the overall volume of your audio file by 3 dB to allow headroom for restored peaks and applies a compression to clipped peaks to prevent further clipping 6 dB no limiter Reduces the overall volume of your audio file by 6 dB to allow headroom for restored peaks A djust the Attenuation slider if you experience clipping Default all parameters Resets all controls on the dialog Clipped Peak Restoration reference This section details the function of each control in the Clipped Peak Restoration dialog Attenuation 0 to 24 dB T he Attenuation slider reduces the volume of your audio file to create headroom for the reconstructed clipped peaks M Enable Post Limiter If you select the Enable Post Limiter check box Attenuation 0 to 24 dB no Attenuation adjustment is required CLIPPED PEAK RESTORATION CHP 5 AT Enable PostLimiter Select the Enable Post Limiter check box to apply compression to clipped peaks before restoration Compression ensures that no further clipping will occur W Enable Post Limiter a Note If you disable the Enable Post Limiter check box you must use the Attenuation slider to allow for the reconstructed clipped peaks A Cross fade edges On Off Select the Crossfade edges check box to cross fade
57. ortcut Menu 6 eee eee eens 31 Noiseprint keyboard shortcuts 0 cc eee eee 32 NAVICGGIOW s24uccnoneoeestoouueeesen seme eansees obese eeceeeusteeeuy eee 32 IEC ON paroa Se ea debe dere oar Gen whe ares ee ee eee A 32 MaQnification 0 0 ee eee eee tee eee e eens 33 Click and Crackle Removal 0000ec cece eens 35 LIMA ONS eveneah AREE EEA ELEELEA ERS 35 Using Click and Crackle Removal 02 cece cece eee ees 36 Click and crackle removal reference 0 cc eens 37 Vinyl Restoration 0 eee 41 LIMITAUIONS 20 eet teen eee eens 41 Using Vinyl Restoration 0 eens 41 Removing Surface NOISE 1 eee eee eens 42 Removing CHECKS 2c2 450 dee cGadsa seu annann nnana nananana nnana 43 TABLE OF CONTENTS 3 Vinyl Restoration reference 2 0 0 eens 43 Click removal amount 1 tO 20 nannan nannaa nannaa annann 43 REGUCE NOISE DY siuadusrreors ot sat eon eerind aed edad cree dad au ewerne 43 Affect frequencies above 100 to 10 000 HZ ccc ees 44 TAN B Fe 8 ic ME aaa aa ra rA AA rT CY ee in 44 ReElGaSe Spee filet ae Vas et nar ar eek ak nie She Be ea ae ha had 44 Noise floor Inf to 40 GB i615 0c2ceeess cnet e iss ee kre eae bn ee eee eas Se 44 Clipped Peak Restoration 0 0 cee ee 45 Using Clipped Peak Restoration ccc ees 46 Clipped Peak Restoration reference n unnsa nanana eee ete 46 Tips and Frequently Asked Questions
58. oval presets may be adjusted using the controls Since each control affects the output significantly we recommend spending some time trying different variations As you experiment you will learn how each control changes the output In some cases adjusting a control will not produce significant audible changes N ot detecting the changes is not due to your understanding of how to adjust the controls but rather due to the underlying algorithm This algorithm is performing many tasks behind the scenes Explaining the algorithm s tasks may cause confusion since they are not intuitive to real world applications CLICK AND CRACKLE REM OVAL CHP 3 LY Click and crackle removal reference This section explains the function of each control in the Click and Crackle Removal dialog box Sensitivity 1 to 20 T he Sensitivity setting determines how sensitive the detection algorithm is to impulsive sounds Sensitivity 1 to 20 co ea With settings below 10 only very significant clicks will be removed Between 10 and 17 smaller clicks will also be removed A bove 17 tiny clicks that cause crackling will also be removed Vinyl LP recordings can usually be cleaned satisfactorily with settings of 12 to 16 H owever some vinyl which has been abused will need higher settings and in extreme cases the maximum setting may do the best job The best settings for 78 RPM recordings tend to run from 16 to 19 but really noisy 78s may requi
59. oves less noise than M ode 0 e Mode 2 isthe default Reduction type T his mode removes less noise than M odes 0 or 1 and it isless likely to produce artifacts e Mode 3 Isleast prone to causing artifacts and often sounds much more natural and non intrusive than the other modes H owever not as much noise is removed in some cases W hen using M odes 1 2 or 3 the Noise bias control can make a large difference in the quality of the output A Iso the Reduce noise by control can be set higher than in M ode 0 without introducing artifacts Os Note T he Reduction control is duplicated on the G eneral and N oiseprint pages for convenience nS NOISE REDUCTION CHP 2 a 25 Noise bias 20 to 20 dB T he Noise bias slider allows you to fine tune the overall level of the noiseprint much like moving all the noiseprint envelope points up and down would Click and drag the slider handle to adjust the Noise bias setting Noise bias dB C E gy foo A Ithough in general a setting of 0 dB will be very effective trying values between 6 dB and 6 dB is recommended for maximizing noise reduction quality M oving the Noise bias control above 0 dB has the effect of making the noise reduction algorithm remove more noise but is more likely to cause low level non noisy audio to be reduced Noise bias levels below 0 dB will reduce the amount of signal attenuated but if set too low noise will remain in the audio aaae Note T he
60. quencies can compensate for this loss To enable the filter select the High shelf start freq check box To vary the frequency above which the filter will be applied to the source material click and drag the slider left or right or type a value in the edit box P Highshel sar fea Gite 1000 o a fr on0 High shelf gain 20 to 20 dy a 2 Below the High shelf start freq slider is the High shelf gain slider To adjust the level by which the filter boosts or cuts high frequencies click and drag the slider to the left or right or type a value in decibels in the edit box Adjusting the precision of frequency analysis T he Windowing section provides settings to determine the precision of the frequency analysis of the noiseprint Windowing FFT size 128 to 16 384 1 024 E Overlap B7 to 90 2 sg fes FFT size indicates the size of the samples that the algorithm uses to analyze the frequency spectrum of the sound To adjust the FFT size setting choose a new setting from the drop down list Overlap controls the amount of overlap between frequency analysis windows O verlapping sometimes allows for more accuracy of the analysis To adjust the Overlap click and drag the slider to the left or right or type a value in the edit box T he default setting of 75 Is recommended For faster processing set the value to a lower value CHP 2 NOISE REDUCTION 13 gt a Seeing the removed noise T he
61. r sample as opposed to 16 bit or 24 bit have an inherent noise floor that is very high Removing the noise is possible during 16 bit playback but when the files get saved back to 8 bit the re quantization puts the noise right back into the file The only way to remove the noise isto run anoisegate that mutes the silent regions to zero H owever the noise will still be present during non silent regions We recommend that instead of using 8 bit PCM files a compressed format such as A DPCM or MPEG be used that requires the same amount of storage or less than 8 bit PCM but has a much lower noise floor Why do hear flange type artifacts during processing W hen using N oise Reduction trying to remove too much noise at once can sometimes create high pitched flanging type artifacts in the processed signal T here are a couple of things you may try to avoid flanging e On the General page lower the Reduce noise by slider Reduce noise by Off to 100 dE J fH 62 8 Some files may require you to make multiple passes of N oise Reduction rather than trying to make one large pass Reduction of 6 to 10 dB is usually a very safe amount to try for almost any sound file Use Modes 2 or 3 to minimize the flangy chirps Adjust the Noise bias setting with its slider e OntheN oiseprint page manually adjust the controls as they apply to the noiseprint TIPS AND FREQUENTLY ASKED QUESTIONS APPENDIX A Reduce noise by
62. re the maximum setting for best results W hen very aggressive Sensitivity settings are necessary to clean up the material at hand the Click shape control can be used to prevent damage to percussive attacks by setting it to 1 0 millisecond or less Click shape 1 to 8 T he Click shape setting determines the type of clicks the algorithm detects In most cases it should be left between 4 and 6 Click shape 1 to 8 4 W ith settings above 6 very small high frequency clicks will be more easily detected W ith settings below 4 larger pops will be detected more easily Since the clicks from old 78s are generally made up of a lower frequency distribution than LPs settings of 3 and 4 tend to detect them better Theclicksfrom LPswith a greater amount of high frequency content are detected better with larger settings such as 6 or 7 CHP 3 CLICK AND CRACKLE REMOVAL 38 z _ Max click size 1 to 3 0 milliseconds T he Max click size setting establishes the longest click that will be detected by the algorithm In most cases the default setting of 3 milliseconds works well Max click size 0 1to30 COo fy 30 Lower settings can be useful if you want to remove only small clicks or crackling H owever if your file has large amounts of cymbals snare drums castanets etc they could get confused with clicks So lower settings such as 1 0 ms will prevent these fast attacks from being removed If you look at the wave form of
63. red and then press OK to process _ __rrlrlrlrlLcccccccccccctci_x Note Some DirectX plug ins including N oise Reduction are not supported as track effects in the multi track window C akewalk Pro A udio requires that these effects be used in the A udio View to process the audio T his requirement is a C akewalk Pro A udio issue and not a N oise Reduction Issue Ooo Using Noise Reduction with Steinberg WaveLab T he following procedure is explained in two parts opening the file and capturing the noiseprint Opening the file L 2 3 4 CHP 2 Open A Cnoise WAV from the folder where you installed N oise Reduction Select a region that contains only the air conditioner noise with no voice From the View menu choose Window and then Master Section From the DirectX menu choose Sonic Foundry Noise Reduction NOISE REDUCTION 1 Captunng the noiseprint L Click the Capture noiseprint check box at the bottom of the dialog 2 Press F6 to play the current selection A fter the first pass through the selection the plug in has captured a noiseprint and switched to process mode N oise Reduction is now reducing noise in real time but only reducing the selected noise 3 Select the entire file in WaveLab and press F T he entire file will now play allowing you to change parameters and simultaneously listen to the results 4 Click the A pply button in the M aster Section
64. s The advantage of the A udio Plug in Chainer isthat you can create a chain of effects that an audio file will pass through one time This can speed up the restoration process significantly H owever you will need a fast computer to preview these processing chains in real time To run multiple effects do the following L From the DirectX menu choose Audio Plug in Chainer T he A udio Plug in Chainer dialog will appear APPENDIX A TIPS AND FREQUENTLY ASKED QUESTIONS oundry Acoustic Mirror ic Foundry Amplitude Modulation c ic Foundry Click Removal onic Foundry Graphic EQ ic Foundry Multi B and Dynamics ic Foundry Multi T ap Delay ji SONIC FOUNDRY Pl CPU 24 bit processing MV Create undo s Plugins _ Selection 00 00 00 000 to 00 00 04 986 00 00 04 986 Channels Mono Selection Sound Forge Audio Plug in Chainer dialog 2 Click the A dd 3 In the A dd Plug Ins dialog select the plug ins you want and click the A dd button Select multiple plug ins by holding down the key The plug ins will appear in the order that you added them in the A udio Plug In Chainer dialog a Note You can then modify the parameters for each plug in by double clicking on the list entries EE HKREe 4 Click the OK button on the A udio Plug in Chainer dialog to process the audio file Add plug in dialog button The A dd Plug Ins dialog will appear Removing c
65. se from old recordings simultaneously An advanced filtering technique detects and automatically removes the very fast transients generated by dirt and scratches in the surface of a record Then a method similar to the N oise R eduction function is used to minimize the audibility of broadband surface noise inherent in older recordings Limitations The first thing you should realize is that a restored recording will never be perfect you should concentrate on making it as enjoyable to listen to as possible M ost listeners do not mind alittle hiss or a muffled pop H owever anything that sounds very unnatural can become very distracting M oderation is the Key Using Vinyl Restoration The Vinyl Restoration dialog is easy to use for eliminating surface noise Sonic Foundry Yinyl Restoration ACnowe war Hame Untitled Cancel Click removal amount 1 to 20 c ed BIH q2 Help Reduce noise by Oif to 100 dE eS A 10 04 Save z Affect frequencies above 100 to 10 000 Hz HH 2 500 _Saveds _ Pelete Attack speed 1 to 20 c 7 B Release speed 1 to 20 c 7 Preview Noise floor Inf to 40 dB c EA 90 0 dB T Bypass M Realtime Vinyl Restoration CPU 24 bit processing M Create undo Selection 00 00 00 000 to 00 00 04 986 00 00 04 986 Sa Channels Mona S CHP 4 VINYL RESTORATION yp Removing surface noise Removing surface noise is an experimental process the settings wi
66. t Full GrabPan Normalize dB Add Paint Reset Selection Select All Ctrl 4 Logarithmic w Line Graph Bar Graph Filled Graph Menu command Zoom Selection Zoom Out Full Grab Pan On Off Normalize dB Add Point Reset Selection Select All Logarithmic Line Graph Bar Graph Filled Graph CHP 2 Function Choose Zoom Selection to view a close up of the selected envelope points Choose Zoom Out Full to view the entire frequency and amplitude range Choose Grab Pan to move through the noiseprint graph by clicking and dragging the mouse vertically or horizontally This option is only available when you are zoomed in on a selection Choose Normalize to set the maximum envelope point at the top of the graph Choose Add Point to add an envelope point Choose Reset Selection to remove the current selection Choose Select All to select all envelope points Choose Logarithmic to display the logarithmic frequencies in the noiseprint graph When Logarithmic is not selected linear frequencies are displayed Choose Line Graph to display the noiseprint as a single unfilled line Choose Bar Graph to display the noiseprint as a series of bars corresponding to the real frequency bins Choose Filled Graph to display the noiseprint as a filled graph Note that some Windows display drivers incorrectly fill the graph when using this mode If this is a problem use Line Graph or Bar Graph instead NOISE REDUCTION
67. t with the noise Sample In a 16 bit 44 1 kH zsound file a sample is one single 16 bit value that is 1 44100 seconds long A single sound file which contains millions of the above can also be called a sample Steady state noise N oise that does not vary much in average amplitude and frequency content T he N oise Reduction plug in reduces this type of noise very well Windowing The windowing controls in the N oise Reduction plug in determine the size and the overlap of the windows used during the FFT analysis of the noise For more information see W indowing area on page 26 APPENDIX B GLOSSARY 66 gt GLOSSARY APPENDIX B Index Activation code 7 Assignable FX pre fader function 61 A ttack speed slider 16 44 Attack speed defined 16 Attenuation slider 46 A udio Plug in Chainer Sound Forge 55 B Buffer size increasing 49 C Cakewalk Pro A udio using N oise Reduction with 13 Click and crackle removal 35 39 limitations 35 retaining cymbal hits 62 tipsand FAQ 62 using 36 with Sound Forge 56 Click and crackle removal reference 37 Click shape slider 37 Keep residual output 39 M ax click sizeslider 38 N oise level 38 Remove low frequency rumble 39 Sensitivity slider 37 Click and crackle vs Vinyl restoration 62 Click removal amount 43 Click shape slider 37 Clicks removing 43 Clipped peak restoration 45 47 using 46 with Sound Forge 58 Clipped peak restora
68. ting and the Noise floor setting Attack speed T he Attack speed slider determines how quickly the noise reduction algorithm reacts to a noiseless signal Attack speed 1 to 20 c 7 Lower values often remove fast transients from a sound while very fast values can create audible artifacts during fast attacks Release speed T he Release speed slider determines how quickly the noise reduction algorithm reacts to a noisy signal Release speed 1 to 20 c 7 H igher values can cause the algorithm to trim the ends of long decaying sounds Noise floor Inf to 40 dB The Noise floor slider determines the level of sound that is considered to be noise N oise reduction is applied only to signals below this setting Noise floor Inf to 40 dE c A 90 046 In most circumstances we recommend a setting between 60 and 85 dB Raise the noise floor for very noisy recordings VINYL RESTORATION CHP 4 45 CHAPTER zee Clipped Peak Restoration The C faced oa Restoration plug in can make the difference between throwing away a once in a lifetime recorded take that contains some clipping and having a virtually distortion free recording Clipping occurs when an audio signal reaches the maximum allowed level in a digital format T he waveform is effectively truncated at that maximum level Unlike in analog systems where clipping is gradual and non linear digital clipping creates a flat
69. tion reference 46 Attenuation slider 46 Cross fade edges 47 Enable post limiter 47 Code activation 7 Computer ID number 7 Computer requirements 5 Cross fade edges defined 47 Eight bit files 54 Email technical support 8 Envelope point creating manually 53 Envelope points adjusting 19 adjusting for high frequency 54 fitting 21 moving group 20 moving one 20 resetting 21 INDEX i YL T_ _ Envelopes 29 amplitude 30 European contact information Title page F Fax technical support 8 FFT size defined 17 Fit button 30 Fit size 30 changing 19 defined 19 Flange type artifacts eliminating 54 Floating point processors 50 Frequencies affecting 44 Frequency analysis adjusting 17 G General page N oise Reduction 15 23 A ttack speed slider 16 25 Capture noiseprint 27 Capture time out 28 FFT size 26 H igh shelf gain slider 26 H igh shelf start frequency slider 17 26 Keep residual output 28 N oise bias 25 Overlap 27 Reduce noise by slider 23 Reduce noise slider 16 Reduction type 24 Release speed slider 16 26 seeing removed noise 18 W indowing area 17 Glossary 63 65 H High hat and cymbal hits retaining 62 High frequency loss compensating for 17 54 H igh shelf start frequency slider 17 Hiss and 8 bit files 54 INDEX Installation 6 Windows 9x 6 WindowsNT 4 0 6 IQS SawPro capturing the noiseprint 15 using N o
70. tput TIPS AND FREQUENTLY ASKED QUESTIONS APPENDIX A 63 APPENDIX a E i T g eg Glossary gt na Loe t Applicatons Programming Interface API A standard set of instructions developed by hardware and software manufacturers to allow 3rd party development for a product For example many hardware manufacturers have A PI s that allow applications to use the processing power of chips on the hardware Broadband noise N oise which spans a wide range or band of frequencies Click A sudden rapid increase in the slope of a waveform can create a click Clicks can be caused by various means including interruptions in the digital data stream or debrisin the channels of a vinyl record Decibel dB A ratio expressed in logarithmic terms T he decibel is used frequently in sound measurement applications A decibel measurement by itself is technically meaningless if it is not referenced to anything For example a reading of 12 dB tells the reader nothing 12 dBV or 12 dBu are meaningful because the reference of the measurement V for 1 volt or u 775 volts is stated H owever we at Sonic Foundry are guilty of the above mentioned crime of nomenclature as well In this text whenever we write 12 dB we are usually referring to 12 dBfs or digital full scale DirectX A set of A PI s designed by M icrosoft for multimedia development A DirectX plug in such as the Sonic Foundry N oise Reduction DirectX p
71. ve attacks from the sound source Can set Clidk and Crackle Removal so it keeps high hats and cymbal hits W ith some source material Click and Crackle Removal has difficulties in distinguishing between strong percussive hits and click noise To set Click and Crackle Removal from removing percussive sounds lower the Max click size until the percussive hits are not being affected about 0 8 milliseconds before every cymbal hit is left untouched H owever lowering the Max click size too much might prevent the removal of larger pop noises which you will have to remove manually A Iternatively use the Sound Forge 4 5 Graphic Fade process To use the fade process do the following L M ake a small selection around a click 2 From the Process menu choose Fade and then Graphic sub menu Leave the endpoints at 100 and create two new envelope points at 0 to mute the click If the silence is too drastic adjust the envelope points to 25 attenuation Using the Keep residual output check box to fine tune parameters Both N oise Reduction and Click and Crackle Removal plug ins allow you to listen to the audio that is being removed W hen the Keep residual output check box is enabled you can adjust settings while listening to just the noise and clicks T hisfunction helps you determine how much noise is being removed and if it is affecting the original signal Also it can help you understand how each of the parameters influence the ou
72. view pass through the selection and then loop back to the beginning A fter the first pass N oise Reduction has captured a noiseprint and switched from capture mode to process mode Process mode means that N oise R eduction is ready to process the sound file The plug in is now reducing noise in real time H owever you are only reducing the noise in your current selection of the A CN oise wav eeaeee Note D uring capture mode you will not be able to change process properties EN 6 Right click on the blank space below the Real time check box and choose Select All Data from the pop up menu Preview l Bypass M Realtime Pre rall Fost roll Select Current The entire file will now play allowing you to change parameters and simultaneously listen to the results Reset Al Save Current 7 Click the OK button on either the General or N oiseprint page to process the entire file Configuration Using the Noise Reduction plug in with Vegas L Open A Cnoise WAV from the folder where you installed N oise Reduction and drag it to the Track View creating a new track in Vegas 2 Click on the Bus FX control T he Plug In Chooser dialog will appear Bus Plug In Chooser ax Gae Audio Sonic Foundry Acoustic Mirror Sonic Foundry Graphic EG c ancel dy FX Sonic Foundry Amplitude Modulation WS Sonic Foundry Mult B and Dynamic Fs Chains Sonic Foundry Chorus WS Sonic Foundry Mult Tap Dela
73. y Add H FL Track Sonic Foundry Click Removal We Sonic Foundry Noise Gate Sonic Foundry Clipped Peak Restoration Sagal tea el a OA ale Reduction Delete Sonic Foundry Distortion WS onic Foundry Paragraphic EQ Save As Sonic Foundry Flange ah wah WS Sonic Foundry Parametric EL Sonic Foundry Gapper Snipper We Sonic Foundry Pitch Shift Sonic Foundry Graphic Dynamics WS Sonic Foundry Reverb of Noise Reduction 3 A dd the Sonic Foundry Noise Reduction plug in aS a Bus FX by double clicking and then clicking the Bus FX plug in chooser s OK button The N oise Reduction dialog will appear CHP 2 NOISE REDUCTION 12 4 5 6 On the N oise Reduction dialog click the Capture noiseprint check box M ake atime selection in Vegas M ake sure the tracks you want to apply N oise Reduction to are assigned to the Bus with the FX On the Vegas transport bar click the play gt button If loop play is enabled click the stop button Otherwise Vegas will continue playing the time selection A fter the noiseprint has been captured use the N oise Reduction controls to edit es Note You may also create an A ssignable F X to apply N oise Reduction For more information see U sing N oise Reduction as an Assignable FX with Vegas on page 60 a Creating a new file with processed output You can isolate the processed mix in Vegas for future projects by doing the following L M ute

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