user manual
Contents
1. Display and visualize sounds for your ease amp diagnosis Manipulate sounds easily using your computer system Save results easily in sound files or group sets of sounds in Project files See your Sounds e Visualise heart sound lung sound amp other intrabody sound Waveforms e Visualise Spectrograms frequency spectrum of heart sounds and lung sounds e Visualise Waveform and Spectrograms together to correlate timing and frequency Catch Sounds e Record from your DigiScope Digital Stethoscope sounds directly to a Computer system The actual product may not be the same as displayed in the photographs Page No 9 e Import recordings from your pen drive iPod mp3 player or import recordings from email attachments or downloaded from the Internet Play and Export Sounds e Play back sounds on a PC Speaker via headphones e Edit and Export sounds to new files for lectures emails podcasts websites or burn CDs Modify Sounds e Amplify Sounds Filter recorded sounds for specific sound characteristics you can slow down recordings so that details such as splits are more audible Use files for Electronic Medical Records Label Sound tracks to identify specific events such as S3 S4 murmurs rhonchi etc Auscultation Research for Advanced Users Investigate heart sounds and lung sounds for new diagnostic methods Award winning Audacity Open Source platform The software source code is freely available for any researchers2. Hereinafter translation is included without limitation in the term modification Each licensee is addressed as you Activities other than copying distribution and modification are not covered by this License they are outside its scope The act of running the Program is not restricted and the output from the Program is covered only if its contents constitute a work based on the Program independent of having been made by running the Program Whether that is true depends on what the Program does 1 You may copy and distribute verbatim copies of the Program s source code as you receive it in any medium provided that you conspicuously and appropriately publish on each copy an appropriate copyright notice and disclaimer of warranty keep intact all the notices that refer to this License and to the absence of any warranty and give any other recipients of the Program a copy of this License along with the Program You may charge a fee for the physical act of transferring a copy and you may at your option offer warranty protection in exchange for a fee 2 You may modify your copy or copies of the Program or any portion of it thus forming a work based on the Program and copy and distribute such modifications or work under the terms of Section 1 above provided that you also meet all of these conditions a You must cause the modified files to carry prominent notices stating that you changed the files and the date of any change The actu
3. asmbison s DigiScope Electronic Stethoscope Version 1 14 USER MANUAL 5 e Version 1 14 l Digi SCope Stethoscope with a differenrs werecdiagnoziLeam The actual product may not be the same as displayed in the photographs nambison s DigiScope Electronic Stethoscope Version 1 14 Specifications e Listening Mode slow medium high e Frequency Response 20 20 000 Hz Low medium amp high frequency filters Battery 9v e Tube Length 2 mtr e Volume Control 15 90 Db PC interface RS232 Serial Features m Portable and Convenient to Operate m Based on Latest Piezo Sensor Technology m Powerful Electronics Amplify the Sound up to a Maximum of 200 Times m Sound Model Heart Lung And other intra body sounds m Frequency Response 20hz 20 000hz m Real Time Record Edit And Display The Heart Rate m Accommodates infant pediatric and adult patients m Integrated with regular stethoscope ECG waveform display m Weight 490g m Sensitivity Automatic The actual product may not be the same as displayed in the photographs Page No 2 ELECTRICAL CHARACTERISTICS OF THE CIRCUIT Operating Supply Voltage 4to12V DC Quiescent Current 4to8mA Output Power 500mW to 700mW Vs 6V RL 8 Ohm THD 10 Voltage Gain 26dB to 46dB Bandwidth 15 Hz to 2000 Hz Total Harmonic Distortion 0 2 Vs 6V RL 8 Ohm Pout 125mW f 1 kHz Power Supply Rejection Ratio 50dB Frequenc
4. The actual product may not be the same as displayed in the photographs Page No 29 Light Dark Color Scheme There are two color schemes dark background and light waveforms Dark Color Scheme or light background and dark waveforms Light Color Schemes The Dark Color Scheme is intended for viewing on a computer screen and the Light Color Scheme is useful for copying the screen to paste into reports that might be printed By using a Light Color Scheme for printed reports you save toner ink and create prints that are easier to read You may also find the Light Color Scheme to be more effective during Powerpoint presentations or other teaching using a projector How to Copy the Display quick instructions on copying the display to the clip board so that you can paste the screen image into a document or report The actual product may not be the same as displayed in the photographs Page No 30 Other Preferences Sound File Formats Envelope Editing MP3 Exporting General Public License Preferences Audio I O Playback Device Use this control to select the device that will be used for playback audio output This is usually only applicable if your computer has more than one sound card Recording Device Select the devce that will be used for recording audio input Note that many devices have multiplesources such as Microphone and Line in to select the input source you will need to use the Mixer Toolbar For finer contr
5. Toolbars Control Toolbar tools play button etc Thinklabs Toolbar Importing and editing heart and lung sounds Mixer Toolbar volume controls input device Meter Toolbar Input and Output level meters Edit Toolbar editing shortcuts Control Toolbar H gt nj m Audio Control Buttons Skip to Start moves the cursor to time 0 If you press Play at this point your project will play from the a beginning _ Play starts playing audio at the cursor position If some audio is selected only the selection is played Loop if you hold down the Shift key the Play button changes to a Loop button which lets you keep playing the selection over and over again Record starts recording audio at the project sample rate the sample rate in the lower left corner of the _ window The new track will begin at the current cursor position so click the Skip to Start button first if you want the track to begin at time 0 Ii Pause temporarily stops playback or recording until you press pause again 1 Stop stops recording or playing You must do this before making changes edting saving or exporting D _ Skip to End moves the cursor to the end of the last track The actual product may not be the same as displayed in the photographs Page No 15 Thinklabs Toolbar wy A fle fur fp rise Import PUiileliiad Mma ices Rate Display The Thinklabs Toolbar provides quick access to special features t
6. parties who have received copies or rights from you under this License will not have their licenses terminated so long as such parties remain in full compliance 5 You are not required to accept this License since you have not signed it However nothing else grants you permission to modify or distribute the Program or its derivative works These actions are prohibited by law if you do not accept this License Therefore by modifying or distributing the Program or any work based on the Program you indicate your acceptance of this License to do so and all its terms and conditions for copying distributing or modifying the Program or works based on it 6 Each time you redistribute the Program or any work based on the Program the recipient automatically receives a license from the original licensor to copy distribute or modify the Program subject to these terms and conditions You may not impose any further restrictions on the recipients exercise of the rights granted herein You are not responsible for enforcing compliance by third parties to this License 7 If as a consequence of a court judgment or allegation of patent infringement or for any other reason not limited to patent issues conditions are imposed on you whether by court order agreement or otherwise that contradict the conditions of this License they do not excuse you from the conditions of this License If you cannot distribute so as to satisfy simultaneously your obliga
7. Headphone BACK VIEW REPLACE BATTERY In case the battery is not recharging Computer out Computer out Open the back panel with screw driver ov err Install a 9 0 Volt rechargeable battery gt Energizer ACCU a recHerce RECHARGEABLE 100 s OF TIMES 9v Rechargeable battery The actual product may not be the same as displayed in the photographs Page No 7 SPECIFICATIONS HOST PC HARDWARE REQUIREMENTS Operating System MS Windows 98 or higher e Processor Pentium II 300 MHz or higher e RAM 64 MB minimum e HDD 300 MB for program and disk cache e Sound Card with input jack Performance Specifications e Frequency Response 20 1000 Hz e File Type wav mp3 ogg ogg vorbis aup Audacity project file format Third Party Requirements for IP transmission Internet IR or bluetooth enabled computer e Sound Quality High fidelity sound e Noise Background noise immunity e Data Transmission Real time amp Store Forward IP all telecom and video conferencing at greater than 9 6Kbps e User Interface Remote amp host units controlled by PC GUI applet e Data Storage Archiving to a PC in multiple formats e Record Length limit depends upon your computer system e Playback at different or normal speed OTHER REQUIREMENT SPEAKER HEADPHONE 1000 Watt Speaker System with WOOFER recommended Recommended Headphones e Speaker WITH Sub Woofer System e Close
8. be the same as displayed in the photographs Page No 23 Label Tracks are generated automatically when you Import a sound file You can then delete the Label Track by clicking X in the left corner of the Label Track To create a new Label Track select New Label Track from the Project Menu Alternatively simply click or select where you would like to place a label and choose Add Label at Selection from the Project Menu and a Label Track will be created automatically if one doesn t already exist To add a new label click or select where you want the new label to appear then select Add Label at Selection from the Project Menu then type the name of the label and finally press Enter or click outside of the label In addition you can use the Add Label at Playback Position command from the Project Menu if you want to add a label at a certain place while you are listening By default this command has a shortcut of Control M To edit the name of a label click anywhere in it Zoom in first if there are too many labels crowded together and you are unable to click on the one you want When a label is selected for editing it looks like the S2 label below pema a a O When editing the name of a label you are limited to using just the backspace key for editing There is currently no way to move the insertion point to append a letter to the beginning of a label Once a label is selected you can move to the next label by pressing Tab a
9. connected to main power or to any other equipment Use only battery powered floating devices For playback with no patient contact any equipment may be used Quick Instructions Recording and playback can be done very easily with our stethoscope Simply connect the stethoscope to the Line Input of the recording device listen to the patient and record To listen to the recording turn off the stethoscope plug the stethoscope into the Headphone Output of the playback device and listen Compatible Devices and Listening to recordings The following devices may be used for Recording Apple iPod Video with recording attachments Other iPods do not provide recording capability Mp3 players with built in recording feature Portable digital recorders Notebook computer operating on battery power Listening to recordings is best done using the stethoscope in headphone playback mode The reason is that body sounds especially heart sounds contain significant low frequency content DigiScope stethoscope are designed to reproduce these low frequencies accurately Most heapdhones cannot reproduce body sounds adequately To listen to recordings perform the following steps 1 Turn off your stethoscope or set the stethoscope volume to 0 2 Conect the stethoscope to the Headphone Output of the recording or playback device 3 Play back the recordings The actual product may not be the same as displayed in the photographs Page No 14
10. for noncommercial distribution and only if you received the program in object code or executable form with such an offer in accord with Subsection b above The source code for a work means the preferred form of the work for making modifications to it For an executable work complete source code means all the source code for all modules it contains plus any associated interface definition files plus the scripts used to control compilation and installation of the executable However as a special exception the source code distributed need not include anything that is normally distributed in either source or binary form with the major components compiler kernel and so on of the operating system on which the executable runs unless that component itself accompanies the executable If distribution of executable or object code is made by offering access to copy from a designated place then offering equivalent access to copy the source code from the same place counts as distribution of the source code even though third parties are not compelled to copy the source along with the object code 4 You may not copy modify sublicense or distribute the Program except as expressly provided under this License Any attempt otherwise to copy modify sublicense or distribute the Program is void and will The actual product may not be the same as displayed in the photographs Page No 37 automatically terminate your rights under this License However
11. or out to look closely at one section or larger portions of a waveform Note that the color scheme can be changed on the Thinklabs Menu to show a bright blue waveform on a dark background Dark Color Scheme or a dark waveform on a white background Light Color Scheme Label Track The Label Track provides a place to annotate events along the time axis such as S1 S2 S3 murmurs etc Label Tracks can be added or deleted as required using Project gt Add Label Track to add a Label Track and X to delete the Label Track Note that if a span of time is selected first the whole span can be labelled This allows you to select an entire duration of a murmur for example and then label it If you then click on the Label it will immediately highlight the entire span Track Name Every Track can be uniquely named When Importing a Sound File it will take the name of the file If you Record a new recording you must give it a name via the Track Pop down Menu The actual product may not be the same as displayed in the photographs Page No 19 Track Control Area The Track Control Area provides information about the Track s and allows for control of editing and playback At the top of the Area are the details of the file you are working with It is either Stereo or Mono The Sampling Rate is also shown High Quality audio requires 44100Hz Sampling Rate You can use a lower sampling rate but if you wish to record CD s use 44100Hz Below the Stereo Mon
12. product may not be the same as displayed in the photographs Page No 17 Normally the meters are only active when you are playing or recording audio However you can also monitor input when you re not recording to do this either select Monitor Input from the input meter s pop up menu or else just click on the input meter If you have a microphone or other input source attached you will be able to watch the level of the audio before you start recording Each meter shows several characteristics of the audio level at once The right hand end of the meter corresponds to the point at which the audio will be clipped and the left hand end is silence For stereo the top bar shows the left channel and the bottom bar shows the right channel The brightest part of the bar shows the average audio level related to the loudness and the darker part of the bar shows the peak audio level The peak hold line to the right of this shows the maximum audio level achieved in the last 3 seconds Finally the clipping indicators on the far right of each meter will light up if clipping is detected meaning that the audio was too loud and will sound distorted If clipping is detected when you are recording you should stop lower the volume of your input source and start recording again from the start If the output meter clips then you need to make some or all of your tracks quieter using the track gain control If the level of the input recording sou
13. your computer and then show Audacity where it is located If you use Windows Download LAME and look for the file called lame_enc dll Download LAME and compile it as a shared object then look for the file called libmp3lame so Macintosh Download LAMELib see our website for more info You need to Linux Unix For links to these MP3 encoders go to the Audacity web page http audacity sourceforge net and go to the page for your operating system The first time you try to export an MP3 file Audacity will ask you to locate your MP3 encoder Locate the file indicated above From then on Audacity will not need to ask you again and you will be able to export MP3 files easily General Public License Note Audacity is distributed under the terms of the GNU General Public License GPL the full text of the license is below All of the source code to Audacity is available from http audacity sourceforge net However some of the libraries that Audacity is based on are distributed under the terms of different but GPL compatible licenses Version 2 June 1991 59 Temple Place Suite 330 Boston MA 02111 1307 USA Everyone is permitted to copy and distribute verbatim copies of this license document but changing it is not allowed Preamble The licenses for most software are designed to take away your freedom to share and change it By contrast the GNU General Public License is intended to guarantee your freedom to shar
14. P Audacity projects are stored in an AUP file which is a format that has been highly optimized for Audacity so that it can open and save projects quickly In order to achieve this speed Audacity breaks larger audio files into several smaller pieces and stores these pieces in a directory with a similar name as the project For example if you name a project chanson then Audacity will create a project file called chanson aup to store the general information about your project and it will store your audio in several files inside a directory called chanson_data While the Audacity Project format is based on XML and is meant to be open it is not currently compatible with any other audio programs so when you are finished working on a project and you want to be able to edit the audio in another program select Export from the File Menu WAV Windows Wave format This is the default uncompressed audio format on Windows and is supported on almost all computer systems Audacity can read and write this format People working with multichannel audio at very high quality settings or with very long recordings should note that the maximum size of a wav file is 2GB AIFF Audio Interchange File Format This is the default uncompressed audio format on the Macintosh and it is supported by most computer systems but it is not quite as common as the WAV format Audacity can read and write this format Sun Au NeXT This is the default audio format on S
15. al product may not be the same as displayed in the photographs Page No 36 b You must cause any work that you distribute or publish that in whole or in part contains or is derived from the Program or any part thereof to be licensed as a whole at no charge to all third parties under the terms of this License c If the modified program normally reads commands interactively when run you must cause it when started running for such interactive use in the most ordinary way to print or display an announcement including an appropriate copyright notice and a notice that there is no warranty or else saying that you provide a warranty and that users may redistribute the program under these conditions and telling the user how to view a copy of this License Exception if the Program itself is interactive but does not normally print such an announcement your work based on the Program is not required to print an announcement These requirements apply to the modified work as a whole If identifiable sections of that work are not derived from the Program and can be reasonably considered independent and separate works in themselves then this License and its terms do not apply to those sections when you distribute them as separate works But when you distribute the same sections as part of a whole which is a work based on the Program the distribution of the whole must be on the terms of this License whose permissions for other licensees extend to th
16. anytime which allows you to press Record and not have the recording start until you unpause it Sometimes starting a paused recording can be faster than starting to record in the first place Update spectrogram while playing Because spectrograms are slower to draw normally they are not drawn during playback but this option lets you draw the spectrograms anyway Enable Edit Toolbar Sets whether or not you want to display the Edit Toolbar which has some common shortcuts for editing commands Enable Mixer Toolbar Sets whether or not you want to display the Mixer Toolbar which lets you set the volume levels and input source Enable Meter Toolbar Sets whether or not you want to display the Meter Toolbar for setting audio recording and playback levels Quit Audacity upon closing last window By default on Windows and X Windows but not Mac OS Audacity quits when you close the last project window If you uncheck this box Audacity will open a new blank document instead of quitting To quit Audacity in this case you must specifically select Exit or Quit from the File menu Enable dragging of left and right selection edges Normally when you move the mouse over the left and right edge of a selection the cursor changes to a left or right pointer and you can adjust that edge of the selection independently If you don t like this feature uncheck this box and then clicking will always create a new selection unless you hold down Shift to ex
17. d Type Headphones with Long Stroke e 1000 Watts PMPO Diaphragm e Magnetically Shielded e Large 40mm Driver Unit with 360kJ m High e Control Volume Bass amp Treble Power Neodymium Magnet for Outstanding Sound e S N Ratio gt 80db Quality Accessories 1 Woofer 2 Speakers The actual product may not be the same as displayed in the photographs Page No 8 To bring down the cost of out Digital Stethoscope amp to provide various options to the user we do not provide audio equipments However we recommend the following equipment based on our year long research on sound quality enhancement http www gooshing co uk headphones philips_sbchs900 prices http www onino co uk headphones roland_rh_50 html htto www wikio co uk quide headphones earphones philips review 5968 5136 page1 sort0 html Ee Cemnson Highly Highly Recommended Recommended General MDR XD200 MDR XD400 MDR XD300 Sensitivity 102dB mW 106dB mW 104dB mW Power Handling Capacity 1 5W 3 0W 1 5W Impedance 70ohms 24ohms 70ohms Frequency Response 10 22 000Hz 5 30 000Hz 8 25 000Hz Software requirement Recommended Powered by DigiScope God iuiiaity py For Windows Lapy http audacity sourceforge net download windows g For Mac http www apple com downloads macosx audio audacity html AUDACITY powered features Start using Record and Playback sounds
18. ded by the two goals of preserving the free status of all derivatives of our free software and of promoting the sharing and reuse of software generally NO WARRANTY 11 BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE THERE IS NO WARRANTY FOR THE PROGRAM TO THE EXTENT PERMITTED BY APPLICABLE LAW EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND OR OTHER PARTIES PROVIDE THE PROGRAM AS IS WITHOUT WARRANTY OF ANY KIND EITHER EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU SHOULD THE PROGRAM PROVE DEFECTIVE YOU ASSUME THE COST OF ALL NECESSARY SERVICING REPAIR OR CORRECTION 12 INNO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER OR ANY OTHER PARTY WHO MAY MODIFY AND OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE BE LIABLE TO YOU FOR DAMAGES INCLUDING ANY GENERAL SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES The actual product may not be the same as displayed in the photographs Page No 39
19. e and change free software to make sure the software is free for all its users This General Public License applies to most of the Free Software Foundation s software and to any other program whose authors commit to using it Some other Free Software Foundation software is covered by the GNU Library General Public License instead You can apply it to your programs too When we speak of free software we are referring to freedom not price Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software and charge for this service if you wish that you receive source code or can get it if you want it that you can change the software or use pieces of it in new free programs and that you know you can do these things The actual product may not be the same as displayed in the photographs Page No 35 To protect your rights we need to make restrictions that forbid anyone to deny you these rights or to ask you to surrender the rights These restrictions translate to certain responsibilities for you if you distribute copies of the software or if you modify it For example if you distribute copies of such a program whether gratis or for a fee you must give the recipients all the rights that you have You must make sure that they too receive or can get the source code And you must show them these terms so they know their rights We protect your rights with two steps 1 copyright the s
20. e entire whole and thus to each and every part regardless of who wrote it Thus it is not the intent of this section to claim rights or contest your rights to work written entirely by you rather the intent is to exercise the right to control the distribution of derivative or collective works based on the Program In addition mere aggregation of another work not based on the Program with the Program or with a work based on the Program on a volume of a storage or distribution medium does not bring the other work under the scope of this License 3 You may copy and distribute the Program or a work based on it under Section 2 in object code or executable form under the terms of Sections 1 and 2 above provided that you also do one of the following a Accompany it with the complete corresponding machine readable source code which must be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange or b Accompany it with a written offer valid for at least three years to give any third party for a charge no more than your cost of physically performing source distribution a complete machine readable copy of the corresponding source code to be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange or c Accompany it with the information you received as to the offer to distribute corresponding source code This alternative is allowed only
21. e label by typing with the keyboard and then hitting Enter or Return when you re done Only available whilst audacity is playing Help Menu Thinklabs Phonocardiography Help Takes you to www thinklabsmedical com Help information on using Thinklabs Phonocardiography Software Audacity Help The original Audacity Help information This can be useful to see some of the tools that exist in standard Audacity In some cases the standard Audacity provides features that have been removed from Thinklabs Phonocardiography The actual product may not be the same as displayed in the photographs Page No 28 About Thinklabs takes you to www thinklabsmedical com About Audacity displays the version number and credits If you compiled Audacity yourself check here to verify which optional modules were successfully compiled in Thinklabs Menu The items in this menu only work when you have audio selected Audacity does not have any real time effects you must select the audio apply the effect and then listen to the results Most effects have a Preview button Clicking on this button plays up to three seconds of audio allowing you to hear what it will sound like after the effect is applied This is useful for fine tuning the effect parameters Amplify changes the volume of the selected audio If you click the Allow clipping checkbox it will let you amplify so much that the audio ends up beyond the range of the waveform and is cli
22. erent than the one you use during Export or mixing High quality sample rate converter Audacity has more than one sample rate converter that s used when you have a track that s not the same sample rate as the project This option lets you set the converter used during Export and mixing which can be different than the one you use for real time playback Real time dither Dithering is used when converting high quality samples with a lot of dynamic range to CD quality samples with less dynamic range A small amount of dithering can make the audio sound a little bit better but it can also slow down processing a little bit This option lets you set the dithering used for real time playback High quality dither Dithering is used when converting high quality samples with a lot of dynamic range to CD quality samples with less dynamic range A small amount of dithering can make the audio sound a little bit better but it can also slow down processing a little bit This option lets you set the dithering used during Export and mixing File Formats When importing uncompressed audio files into Audacity Make a copy of the file before editing safer Selecting this means that Audacity will take longer to import files but it will always have its own copy of any audio you are using in a project You can move change or throw away your files immediately after you open or import them into Audacity Read directly from the original file faster Select
23. esources However it is only possibly if inout and output are on the same sound device PC users can do the same thing in their volume control settings turning up the relevant audio input Software Playthrough Does the same thing as hardware playthrough but in software This means that the audio you hear may be slightly delayed relative to the input and activating this option will use some more system resources However it works on all systems even if you are recording from one device and playing back through another Quality Default Sample Rate This controls the sample rate of new projects To change the sample rate of an existing project use the control in the lower left corner of the main project window Default Sample Format This controls the default format used to store audio samples 16 bit takes up the least space and is equivalent to audio CD quality 32 bit float takes up twice as much space but is much more flexible If you have a fast computer and enough disk space you should always use 32 bit float samples while editing and then export your final mix as a 16 bit WAV file the default The actual product may not be the same as displayed in the photographs Page No 31 Real time sample rate converter Audacity has more than one sample rate converter that s used when you have a track that s not the same sample rate as the project This option lets you set the converter used during real time playback which can be diff
24. eters Low Pass Filter allows you to filter out higher frequencies and keep the lower frequencies This is useful for filtering out hiss or white noise ambient noise or breath sounds and enhance heart sounds This is a quick filter to use however we recommend using Filter Button on the Audacity Toolbar for better control of the filtering parameters Plot Spectrum To use this feature first select a region of audio from a single track then select Plot Spectrum It opens up a window that displays the Power Spectrum of the audio over that region calculated using the Fast Fourier Transform The graph represents how much energy is in each frequency As you move the mouse over the display it shows you the nearest peak frequency This window can also display other common functions that are calculated using the Fast Fourier Transform including three versions of the Autocorrelation function The Enhanced Autocorrelation function is very good at identifying the pitch of a note Import Audio allows you to add a sound file to the Project Patient If you have recorded one or more heart or lung sounds and you wish to work on them or add them to other sound tracks you already have open use Import to import the sound file into a new audio track When you use Import a Label Track will also be added to facilitate annotation of the imported sound New Label Track allows you to add a new Label Track to a project This is to provide annotation
25. fect occurs within the warranty period repairs will be performed free of charge upon returning the device to Nambison s softroniX wherein the cost of postage to amp fro of the device have to be borne by the purchaser of the device The warranty will be voided in cases of abuse excessive or inappropriate use conditions or accidental damage to the product Nambison s softroniX may at it s sole discretion replace the product with a suitable equivalent model The warranty is transferable at Nambison s softroniX discretion only All disputes to be settled in the courts of Bhopal jurisdiction only For maintenance repair service and contact information visit the DigiScope website at http digiscope diagnozit com amp www diagnozit com and check the Support page Before shipping the product for repair please contact support diagnozit com first The actual product may not be the same as displayed in the photographs Page No 13 Recording Heart Sounds and Lung Sounds Our Stethoscope provide for the recording and playback of sounds using the Audio I O jack Using your stethoscope and an external recorder or playback device you can Record while listening to a patient Record voice annotations dictations by simply speaking into the stethoscope Playback recordings using the stethoscope headphones for high quality audio See safety precautions for Recording Never record from patients using a recording device that is
26. hat are useful for visualizing manipulating and analyzing heart and lung sounds Some of these functions are also accessible via the Thinklabs Menu Thinklabs Special Function Buttons Import Audio allows you to import sounds recordings into the current Project Patient If you have recorded one or more sound s from a patient use Import to open the sound file Continue to add additional files that belong to a given patient so that the Project contains all the relevant recordings made during one exam Each file is imported into its own separate Track Note that Stereo recordings will import with both Left and Right Use the Track Menu to Split Tracks then Delete the unwanted track and then select Mono in the Track Menu This will convert stereo to Mono and remove a duplicate track Amplify a Track or part of a Track must be selected to activate this function allows you to scale a track to be louder and softer It is recommended that you simply Amplify to the maximum level This can be done automatically by clicking Amplify and then OK and the Amplify function will adjust to maximize Amplify without clipping any peaks If you wish to control the amplification level enter a value into the dB window Note that a signal doubles in amplitude for every 6dB and halves for every 6dB amplitude change Note that you can select a small segment of a waveform such as the sounds between peaks and amplify them significantly to enhance murm
27. ing this means that Audacity depends on your original audio files being there and only stores changes you make to these files If you move change or throw away one of the files you imported into Audacity your project may become unusable However because Audacity doesn t need to make copies of everything first it can import files in much less time Uncompressed Export Format This lets you select the format that Audacity will use when you export uncompressed files 11 common options are displayed in the list but you can also select Other and choose a nonstandard file format for Audacity to export Ogg Export Setup Use this control to set the quality of Ogg Vorbis exporting Ogg Vorbis is a compressed audio format similar to MP3 but free of patents and licensing fees A normal quality Ogg Vorbis file is encoded with a quality setting of 5 Note that unlike MP3 encoding Ogg Vorbis does not let you set a bitrate because some audio clips are easier to compress than others Increasing the quality will always increase the file size however Export Setup Use these controls to locate your MP3 encoder and set the quality of MP3 encoding Higher quality files take up more space so you will need to find the level of quality you feel is the best compromise For more information see Exporting MP3 Files Spectrograms You can view any audio track as a Spectrogram instead of a Waveform by selecting one of the Spectral views from the Track Pop Down Me
28. iquid If the DigiScope is inadvertently immersed in liquid do NOT Power ON the unit Completely dry out the inner spaces before trying to use the DigiScope again Contact diagnozit gmail com for assistance e Do not sterilize the DigiScope using any sterilization process Wipe the DigiScope with alcohol swabs or a soft cloth moistened with alcohol or water Do not use abrasive cleaning agents and do not allow fluids to enter the device e Avoid extreme heat cold or humidity for either storage or use of this device e Remove battery if device is not to be used for a period of months e See Tips and Troubleshooting for more information The actual product may not be the same as displayed in the photographs Page No 11 As electronic equipment DigiScope also needs care Therefore handle it with care If you have heavy usage of stethoscope then wear and tear may cause the wire to break from the stethoscope We advise you to secure your chest piece the way it is shown in the below picture Also make sure to read the user manual carefully before use The actual product may not be the same as displayed in the photographs Page No 12 Service and Warranty This product is warranted against manufacturing or materials defects for a period of one year from the invoice date the warranty applies only on the main unit amp not on the accessories i e chest piece earphone wiring charger and battery If a material or manufacturing de
29. label starting with the time offset in seconds then a tab and then the name of the label for example 1 217995 Bass intro 3 921073 Guitar enters 7 584454 Drums enter 11 070002 Chorus To import a Label Track choose Import Labels from the File Menu The actual product may not be the same as displayed in the photographs Page No 24 Menu Bar Track Pop Down Menu File Menu Edit Menu View Menu Project Menu Help Menu Thinklabs Menu File Menu New creates a new empty window Open opens an audio file or an Audacity project in a new window unless the current window is empty To add audio files to an existing project window use one of the Import commands in the Project menu Close closes the current window asking you if you want to save changes On Windows and Unix closing the last window will quit Audacity unless you modify this behavior in the Interface Preferences Save Project saves everything in the window into an Audacity specific format so that you can save and quickly continue your work later An Audacity project consists of a project file ending in aup and a project data folder ending in _data For example if you name your project Composition then Audacity will create a file called Composition aup and a folder called Composition_data Audacity project files are not meant to be shared with other programs use one of the Export commands below when you are finished editing a file Sa
30. ls has no effect on the audio data in your project in other words it doesn t matter what the output volume level is when you Export or Save a project the end result is the same Edit Toolbar Jejeje ole eleele All of the buttons on this toolbar perform actions and with a couple of exceptions they re all just shortcuts of existing menu items to save you time Holding the mouse over a tool will show a tooltip in case you forget which one is which amp Paste it Trim away the audio outside the selection wal Silence the selected audio 5 Undo a Redo repeat last command Zoom In Zoom Out R Fit selection in window zooms until the selection just fits inside the window P Fit project in window zooms until all of the audio just fits inside the window Meter Toolbar a d 5 3 30 24 18 12 6 0 Py 5 3 30 24 18 12 6 0 The Meter Toolbar is used for monitoring the input and output audio levels Typically it is used to make sure that the loudest volume is as loud as possible for maximum fidelity without clipping or distorting it The output playback meter is the green one on the left in the picture above and the input recording meter is in red on the right The meters provide a visual indication of the current audio levels going in and out of audacity If you float the Meter Toolbar by dragging it out of the toolbar you can resize it and even orient it vertically The actual
31. nd move to the previous label by pressing Shift Tab To delete a label or multiple labels select the area containing the label flags you wish to delete and choose Silence from the Edit Menu Alternatively you can delete an individual label by clicking on it and pressing Backspace until you have deleted all of the characters in the label then pressing Enter To move labels use the normal editing commands like Cut Copy Paste Delete and Silence You can save a selection in a label When you create a new label the left selection edge determines the position of the label s flag However the right selection edge is also stored in the label and when you click on it the full original selection will be restored If you wish to apply this selection to only a subset of the tracks shift click in the label area to the left of each track s waveform to change whether each track is part of the selection or not Exporting and Importing label tracks Label Tracks are saved when you save an Audacity Project so if you just want to continue using the labels along with the same file just save a project But you can also export the labels to a simple text file and import them This allows you to save information about the locations of events in an audio file for use in another program and also provides a way to mass edit the labels if necessary To export a Label Track choose Export Labels from the File Menu The exported file will contain one line per
32. ndicate the breaks between exported files Page Setup configure how Audacity will print out the track waveforms using the Print option and what printer to use Print Print out the main window view from audacity showing the tracks and waveforms Exit Quit closes all windows and exits Audacity prompting you to save any unsaved changes first The actual product may not be the same as displayed in the photographs Page No 25 Edit Menu The Edit Menu provides functions for editing waveforms In order to activate most functions you need to select part or all of a waveform The dark grey region is selected and any edit command will operate only on that waveform segment To select a region place your mouse at the strarting point and drag to the end point To select an entire waveform Click Cirl A Undo This will undo the last editing operation you performed to your project Audacity supports full unlimited undo meaning you can undo every editing operation back to when you opened the window Redo This will redo any editing operations that were just undone After you perform a new editing operation you can no longer redo the operations that were undone Cut Removes the selected audio data and places it on the clipboard Only one thing can be on the clipboard at a time but it may contain multiple tracks Copy Copies the selected audio data to the clipboard without removing it from the project Paste Inserts whate
33. nu This dialog lets you adjust some of the settings for these spectrograms FFT Size The size of the Fast Fourier Transform FFT affects how much vertical frequency detail you see Larger FFT sizes give you more bass resolution and less temporal timing resolution and they are slower Grayscale Select this for gray spectrograms instead of colored ones Maximum Frequency Set this value anywhere from a couple of hundred hertz to half the sample rate i e 22050 Hz if the sample rate is 44100 Hz For some applications such as speech recognition or pitch extraction very high frequencies are not important visually so this allows you to hide The actual product may not be the same as displayed in the photographs Page No 32 these and only focus on the ones you care about Directories Use this panel to set the location of Audacity s temporary directory folder Audacity uses this directory whenever you work on a project that you haven t saved as an Audacity Project AUP file yet You have to restart Audacity close and open it again for changes to the temporary directory to take effect Interface Autoscroll while playing Scrolls the window for you while playing so that the playback cursor is always in the window This can hurt playback performance on slower computers Always allow pausing Normally the Pause button is only enabled while you are playing or recording Checking this box allows you to set the pause button
34. o is the data format About Stereo or Mono Tracks Usually you do not need Stereo for heart sounds or lung sounds recorded from the stethosope If you used an iPod for recording one channel will probably be blank and you only need the Left Channel If you have Imported a Stereo Track use the Track Pop Down Menu to first Split Stereo to Mono and then delete the blank track using the X in the top left corner Controlling and Editing Tracks Tracks or parts of tracks can be selected for Playback or Editing as illustrated here Playback You must select which track you would like to hear when the PLAY button is clicked You do this by clicing Playback Select turning it bright Cyan turquoise in the Track Control area as shown below Mono 44100Hz 32 bit float Volume The Slider just below Playback Select controls the Volume of the track playback There are also other places to control volume a Mixer Toolbar and b In Windows on the Audio Controls If sounds are too quiet consider using the Amplify function on the Thinklabs Toolbar to Amplify a track Editng a Whole Track An entire track or part of a track can be edited Amplify Filter Tempo Change deleted copied etc To select the entire track for editing Click anywhere in the Track Control area as shown below Notice that the COLOR of the Track Control area is GREY for a track that is selected for editing and the portion of the track itself that will be edited als
35. o turns grey The actual product may not be the same as displayed in the photographs Page No 20 Editing Part of a Track To select a portion of a Track to edit DRAG your mouse ACROSS the portion you wish to edit It will turn Grey as shown below If you wish to select a new portion simply redo the drag operation x IEMR Iinfecti Y 1 0 Mono 44100Hz 0 5 1 0 ema O E The actual product may not be the same as displayed in the photographs Page No 21 Waveform and Spectrum View Mono 44100Hz 32 bit float m e i The Dispay view can show waveform spectrum or both The above image shows both waveform and spectrum It is generally faster to locate sections of interest using waveform only view and then switching to waveform spectrogram when a region of interest is in view Turning Spectrogram on of off can be done using the Thinklabs Toolbar Display button or the Toolbar Pulldown Menu lt is also possiblt to show Spectrogram only Spectrum asil Mono 441 00Hz 32 bit float Spectrum Only view is selected on the Track Pop Down Menu see below and shows the Spectrogram only Note that resolution of the Spectrogram can be adjusted via Edit gt Preferences gt Spectrogram Using a higher resolution requires a faster computer The actual product may not be the same as displayed in the photographs Page No 22 Track Pop Down Menu M Name 13 BI Move Track Down Spect
36. oftware and 2 offer you this license which gives you legal permission to copy distribute and or modify the software Also for each author s protection and ours we want to make certain that everyone understands that there is no warranty for this free software If the software is modified by someone else and passed on we want its recipients to know that what they have is not the original so that any problems introduced by others will not reflect on the original authors reputations Finally any free program is threatened constantly by software patents We wish to avoid the danger that redistributors of a free program will individually obtain patent licenses in effect making the program proprietary To prevent this we have made it clear that any patent must be licensed for everyone s free use or not licensed at all The precise terms and conditions for copying distribution and modification follow TERMS AND CONDITIONS FOR COPYING DISTRIBUTION AND MODIFICATION 0 This License applies to any program or other work which contains a notice placed by the copyright holder saying it may be distributed under the terms of this General Public License The Program below refers to any such program or work and a work based on the Program means either the Program or any derivative work under copyright law that is to say a work containing the Program or a portion of it either verbatim or with modifications and or translated into another language
37. ol over audio I O open your system s Sound control panel or the control panel software that came with your sound card Recording Channels Use this to select the number of channels to record simultaneously Select 1 for mono and 2 for stereo Audacity will support recording more simultaneous channels but note that most sound cards only support stereo and even if your sound card supports more than 2 inputs you need a fast computer and a large fast hard disk to record many channels for a long time Mono recording is not the same on all computers or sound cards Sometimes recording mono only records the left channel and sometimes it mixes the left and right channels Play other tracks while recording new one When this box is checked Audacity will play existing tracks when you press record otherwise it simply records the new track without letting you hear what you ve already recorded You can use this option to record harmonies with yourself or add a voiceover You may notice that when you play the two tracks you recorded together they aren t synchronized This is unavoidable to a certain extent although Audacity tries to minimize it To fix it you will need to grab the Time Shift tool and slide one of the tracks around until it sounds right Hardware Playthrough Mac Only plays the audio you are recording straight back out to your headphones or speakers so you can hear it This option is done in harware so it is fast and doesn t consume r
38. or software developers who wish to expand the power of auscultation with new analysis software After installing Audacity your system will show Heart sound waveform as below Audacity x File Edit view Project Generate Effect Analyze Help Ss IR i il R ool US D P ve COSS 48 42 36 30 24 18 12 6 0 P 48 42 36 30 24 18 12 6 0 Je lejeje J lt E 14 0 15 Mono 44100Hz 16 bit x Audio Track v Mono 441 00Hz 16 bit Mute Solo i R Q A raie nl Record Project rate 44100 Cursor 0 06 327438 min sec Snap To Off start Google Talk ER amp Audacity The actual product may not be the same as displayed in the photographs Page No 10 Software setting for simultaneous listening of Speaker amp Headphone Go to your Audio settings gt Mixer gt Enable multi streaming playback as shown in the below image Different drivers software provides different interface Please contact your vendor for exact path dees WLI Audio O Microphone Realtek HD Audio rear output Playback s ya T f Wave SW Synth CD Player Front s lt K Multi streaming Setting X A Enable multi streaming playback RA Output Mic In Line Into front amp v utput Mic In Line In to front panel amp Output Mic In Line In to rear panel Record cee Cancel aambison s General Maintenance and Cleaning e Do not immerse the DigiScope in any l
39. pped distorted The default value when you open the effect is to amplifiy so that the loudest part of the selection is as loud as possible without distortion Change Tempo changes the tempo speed of the audio without changing the pitch This will change the length of the selection This is useful for expanding sounds so that heart sound splits and other rapid events can be slowed down Note that you must select part or whole track to activate this function Equalization Boost or reduce arbitrary frequencies You can select one of a number of different curves designed to equalize the sound of some popular record manufacturers or draw your own curve FFT Filter similar to Equalization lets you enhance or reduce arbitrary frequencies The curve here uses a linear scale for frequency Normalize allows you to correct for DC offset a vertical displacement of the track and or amplify such that the maximum amplitude is a fixed amount 3 dB It s useful to normalize all of your tracks before mixing If you have a lot of tracks you may then need to use the track gain sliders to turn some down High Pass Filter allows you to filter out lower frequencies and keep the higher frequencies This is useful for filtering out heart sounds when you are only interested in lung sounds enhancing valve clicks etc This is a quick filter to use however we recommend using the Filter Button on the Thinklabs Toolbar for better control of the filtering param
40. pyrighted interfaces the original copyright holder who places the Program under this License may add an explicit geographical distribution limitation excluding those countries so that distribution is permitted only in or among countries not thus excluded In such case this License incorporates the limitation as if written in the body of this License 9 The Free Software Foundation may publish revised and or new versions of the General Public License from time to time Such new versions will be similar in spirit to the present version but may differ in detail to address new problems or concerns Each version is given a distinguishing version number If the Program specifies a version number of this License which applies to it and any later version you have the option of following the terms and conditions either of that version or of any later version published by the Free Software Foundation If the Program does not specify a version number of this License you may choose any version ever published by the Free Software Foundation The actual product may not be the same as displayed in the photographs Page No 38 10 If you wish to incorporate parts of the Program into other free programs whose distribution conditions are different write to the author to ask for permission For software which is copyrighted by the Free Software Foundation write to the Free Software Foundation we sometimes make exceptions for this Our decision will be gui
41. rce is too high you can try to lower the input level using the Mixer Toolbar but if this doesn t work you should try to lower the volume of the external input source e g your microphone cassette player or record player It is possible especially if you have an older slower computer that the Meter Toolbar may interfere with Audacity s ability to record or play audio with the highest quality because your computer is so busy redrawing the meters that it doesn t have time to process enough audio In this is the case for you you can disable the Meter Toolbar in the Interface tab of the Preferences dialog The actual product may not be the same as displayed in the photographs Page No 18 Tracks Audio Track Label Track Track Layout Track Menu Waveform Track Mono 44100Hz 32 bit float Label Track Track Control Area Labels Tracks show the actual sound waveforms or spectrograms Getting to know how to work with tracks in central to using Thinklabs Phonocardiography for working with heart sounds or lung sounds The basic anatomy of a Track is shown above Track Menu Provides options for manipulating each Track See Track Pop Down Menu Click the Playback Select button to select which Track to Play Playback Select will be bright cyan for the selected playback Track Waveform Track Shows the actual heart sound or lung sound time domain waveform It is possible to scroll to any position along the time axis or zoom in
42. rm which may not be visible on the time domain plot of the waveform Note that if you have a slow computer or limited memory it is best to manipulate tracks zoom pan etc without the Spectrogram and the click Display to show the Spectrogram once you ve zoomed in Otherwise you may find that zooming or panning across a track is very slow Mixer Toolbar 4 7 Q z Fad 7 Q H Mic The Mixer Toolbar has three controls used to set the volume levels of your audio device and choose the input source The leftmost slider controls the playback volume the other slider controls the recording volume and the control on the right lets you choose the input source such as Microphone Line In Audio CD etc Use the Record Level Meter to set the correct level To record from your stethoscope connect the stethoscope to the Mic or Line Input and The actual product may not be the same as displayed in the photographs Page No 16 select the correct Input source for the stethoscope Then adjust the Volume Control on the stethoscope and the Input Volume level on the slider Generally it is best to set the stethoscope Volume Control to Maximum 10 However check the recording for clipping of the signal which will produce distortion and annoying sound artifacts Ideally set the level to peak at about 50 75 of maximum Once you have made your recordings use Amplify on the Thinklabs Toolbar to maximize signal levels Changing the Speaker contro
43. rum Waveform and Spectrum Name lets you change the name of the track Importing a Track will name the Track to the file name Recording will not name a Track you must name it using this Menu selection Move Track Up exchange places with the track above this one Move Track Down exchange places with the track below this one Waveform sets the display to Waveform this is the default way of visualizing audio Spectrum display the track as a spectrogram showing the amount of energy in different frequency bands Shoing the Spectrum requires a fast computer It is better to zoom in to the view you want and then show spectrum rather than panning and zooming with Spectrum on Waveform and Spectrum display both waveform and spectrogram Can achieve this on ALL tracks at once by using the Display button on the Thinklabs Toolbar See notice above on Spectrum and computer speed Split Stereo To Mono when you Import a Track if it is a Stereo recording both Channels Tracks will show left and right For phonocardiography use the second track is redundant or blank Once you Import a track Click Split Stereo to Mono and it will split Left and Right Then DELETE the redundant track X in the top left corner of the track Label Track xeme A si f2 3 T Label Tracks can be used to annotate an audio Track They can be used to label S1 S2 S3 S4 murmurs and even save selected portions of a sound The actual product may not
44. s the current selection or cursor position allowing you to restore it later Selection Restore Restores the cursor position to the last position saved by Selection Save Move Cursor gt to Track Start Moves the cursor to the start of the current track Move Cursor gt to Track End Move the cursor to the end of the currently selected track Move Cursor gt to Selection Start Moves the cursor to the start of the current selection Move Cursor gt to Selection End Moves the cursor to the end of the current selection Snap To gt Snap On Enable Snap To mode When Snap To mode is enabled the selection will be constrained to the nearest interval on the time scale by default the nearest second So if you click and drag from 4 2 seconds to 9 8 seconds it will result in a selection from 4 seconds to 10 seconds exactly You can change the units that are snapped to using the Set Selection Format option in the View Menu Snap To gt Snap Off Turns Snap To mode off letting you select arbitrary ranges of time Preferences opens the Preferences dialog View Menu Zoom In Zooms in on the horizontal axis of the audio displaying more detail about less time You can also use the zoom tool to zoom in on a particular part of the window Zoom Normal Zooms to the default view which displays about one inch per second Zoom Out Zooms out displaying less detail about more time Fit in Window Zooms o
45. t Set Go 1 Make connections 5 2 Line out connections Speaker Computer iPod PDA Headphone 7 3 Power supply The device needs 5 0 Volts 7 4 Recommended Hardware 8 5 Recommended Software 9 6 Audio Driver Software settings 11 7 General Maintenance and Cleaning 11 8 Service and Warranty 13 9 Recording Heart Lung sounds using software 14 1 Make connections First of all make sure that the DigiScope is free of physical damages if not please report your supplier Then connect the power supply as illustrated Make line out connections Switch On the instrument by pressing down the switch on the front panel amp look for Red light at the top panel which when glowing indicates the instrument is ready for use FRONT VIEW VOLUME _ ennil STETHO IN The actual product may not be the same as displayed in the photographs Page No 5 CONNECTIONS amp FILTER ae Version 1 14 Digi SCope Stethoscope with a difference WwwaLdiagnosiLcom Stetho line in Charger in The actual product may not be the same as displayed in the photographs Page No 6 Power supply When you see the red light in the front panel is dim or not glowing Insert the jack of the 9v charger into the Stheto in on the front panel amp charge it for 4 6 hours We recommend you to go through this video for more information http youtu be oG4laCHq6e4 VOLUME STETHO IN LINE OUT CONNECTIONS for Speaker Computer iPod PDA
46. tend an existing selection Language sets the language used by Audacity Language files are named audacity mo and are found in the Languages folder on Windows and Mac OS X or in usr share locale or usr local share locale on most Unix systems Audacity will detect new languages the next time you start it Keyboard This panel lets you change keyboard shortcuts All of the commands that appear in Audacity menus appear on the left along with a few other buttons that can get keyboard shortcuts To change a command first click on the command you want to change Then type the new keyboard shortcut on your keyboard Verify that the correct shortcut appears in the box below If it s what you want press the Set button Or to get rid of a keyboard shortcut press Clear To reset to Audacity s defaults press the Defaults button This will get rid of any changes you have made If you have customized your keyboard layout and want to share it with someone else you can press Save and save your complete keyboard layout as an XML file that you can share To load an existing layout press the Load button and locate the XML file The actual product may not be the same as displayed in the photographs Page No 33 Mouse This panel doesn t let you change anything but it lets you view all of the commands and actions that you can do using the mouse many by holding down extra modifier keys Sound File Formats Audacity Project format AU
47. tions under this License and any other pertinent obligations then as a consequence you may not distribute the Program at all For example if a patent license would not permit royalty free redistribution of the Program by all those who receive copies directly or indirectly through you then the only way you could satisfy both it and this License would be to refrain entirely from distribution of the Program If any portion of this section is held invalid or unenforceable under any particular circumstance the balance of the section is intended to apply and the section as a whole is intended to apply in other circumstances It is not the purpose of this section to induce you to infringe any patents or other property right claims or to contest validity of any such claims this section has the sole purpose of protecting the integrity of the free software distribution system which is implemented by public license practices Many people have made generous contributions to the wide range of software distributed through that system in reliance on consistent application of that system it is up to the author donor to decide if he or she is willing to distribute software through any other system and a licensee cannot impose that choice This section is intended to make thoroughly clear what is believed to be a consequence of the rest of this License 8 If the distribution and or use of the Program is restricted in certain countries either by patents or by co
48. un and NeXT computers and usually u law compressed so it is not a very high quality format U law compression is a very simple fast but low quality way to reduce the size of the audio by about 50 This format was one of the first audio formats supported by Web browsers and it is still often used for short sound effects where quality is not as important Audacity exports both 8 bit u law files and 16 bit uncompressed files which are the same quality as wav or aiff files MP3 MPEG I Layer 3 This is a compressed audio format that is a very popular way to store music It can compress audio by a factor of 10 1 with very little degradation in quality Audacity can both import and export this format For more information on how to export MP3 files from within Audacity see Exporting MP3 Files Ogg Vorbis This compressed audio format was designed to be a free alternative to MP3 Ogg Vorbis files are not as common but they are about the same size as MP3 with better quality to rival AAC or WMA Audacity can import and export this format The actual product may not be the same as displayed in the photographs Page No 34 MP3 Exporting Audacity cannot encode MP3 files by itself because the MP3 encoding algorithm is patented and cannot legally be used in free programs However Audacity has been programmed to recognize other existing MP3 encoders that you can download separately All you have to do is obtain the appropriate MP3 encoder for
49. urs Filter a track or part of a track must be selected to activate this function allows you to filter a track or part of a track There are various pre set filters for manipulating heart sounds and lung sounds or you can adjust the Equalizer to filter sound to your own specifications For instance you may find that a sharp Filte jam high pass filter allow high block low frequency enables you to listen to a particular valve sounds very clearly Merely place your cursor over the Equalization Curves and draw the desired response to create a custom filter Rate Change a track or part of a track must be selected to activate this function changes the tempo ed speed of the audio without changing the pitch This will change the length of the selection This is useful Rate for expanding heart sounds so that heart sound splits S3 or S4 and rapid events such as gallops can be slowed down and spread out Display Spectrograms On Off allows you to view tracks with the Spectrogram below the Waaveform or the Waveform without Spectrogram The Spectrogram shows frequence content by showing Frequency along the vertical axis and color as the Intensity of a given frequency For instance if you see a bright region towards the lower part of a spectrogram it suggests that there is a high intensity of low frequency iiss energy at that moment in time This is most useful for seeing murmurs or additional heart sounds such as Display S3 in a wavefo
50. ut until the entire project just fits in the window The actual product may not be the same as displayed in the photographs Page No 27 Fit Vertically Resizes all of the tracks vertically so they all fit inside of the window if possible Zoom to Selection Zooms in or out so that the selection fills the window History Brings up the history window It shows all the actions you have performed during the current session including importing The right hand column shows the amount of hard disk space your operations used You can jump back and forth between editing steps quite easily by simply clicking on the entries in the window the same as selecting Undo or Redo many times in a row You can also discard Undo history to save disk space The history window can be kept open while you work Project Menu Import Audio This command is used to import audio from a standard audio format into your project Use this command if you already have a couple of tracks and you want to add another track to the same project maybe to mix them together You cannot use this option to import Audacity Projects The only way to combine two Audacity Projects is to open them in separate windows then copy and paste the tracks Import Labels This command takes a text file which contains time codes and labels and turns them into a Label Track Import Raw Data This menu command allows you to open a file in virtually any uncompressed format When
51. ve Project As same as Save Project above but lets you save a project as a new name Recent Files brings up a list of files you have recently opened in audacity to be re opened quickly Export As WAV exports all of the audio in your project as a WAV file an industry standard format for uncompressed audio You can change the standard file format used for exporting from Audacity by opening the File Format Preferences Note that exporting will automatically mix and resample if you have more than one track or varying sample rates See also File Formats Export Selection As WAV same as above but only exports the current selection Export as MP3 exports all of the audio as an MP3 file MP3 files are compressed and therefore take up much less disk space but they lose some audio quality Another compressed alternative is Ogg Vorbis below You can set the quality of MP3 compression in the File Format Preferences See alsoMP3 Exporting Export Selection As MP3 same as above but only exports the current selection Export Labels if you have a Label Track in your project this lets you export the labels as a text file You can import labels in the same text format using the Import Labels command in the Project Menu Export Multiple lets you split your project into multiple files all in one step You can either split them vertically one new file per track or horizontally using labels in a Label Track to i
52. ver is on the clipboard at the position of the selection or cursor in the project replacing whatever audio data is currently selected if any Trim Removes everything to the left and right of the selection Delete Removes the audio data that is currently selected without copying it to the clipboard Silence Erases the audio data currently selected replacing it with silence instead of removing it Split Moves the selected region into its own track or tracks replacing the affected portion of the original track with silence See the figure below Duplicate Makes a copy of all or part of a track or set of tracks into new tracks See the figure below The actual product may not be the same as displayed in the photographs Page No 26 i a i i fol Pa aa anda o hadai Arad Ae i hh lit 3 A nuh ieee via date A yay Select gt All Selects all of the audio in all of the tracks in the project Select gt Start to Cursor Selects from the beginning of the selected tracks to the cursor position Select gt Cursor to End Selects from the cursor position to the end of the selected tracks Find Zero Crossings Modifies the selection slightly so that both the left and right edge of the selection appear on a positive slope zero crossing This makes it easier to cut and paste audio without resulting in an audible clicking sound Selection Save Remember
53. y Response VOLTAGE GAIN dB 20 50 100 200 500 1k 2k Sk 10k 20k FREQUENCY Hz Distortion Vs Frequency Vs BV Aitan Pour 125 mi T T Ay J d C55 2 ii t TOTAL HARMONIC DISTORTION Mi 0 20 50 100200 500 Ik k Sk 10m 20k FREQUENCY Hz The actual product may not be the same as displayed in the photographs Page No 3 Distortion Vs Output Power 5 Vs BY ro e Ru a ff ERE Ni i 1 WHE l iil ll REN AANI Anii mull e nati eT 0 001 a0 01 1 0 POWER OUT WATTS TOTAL HARMONIC DISTORTION iH Se i iw EF M w E Note 1 Absolute Maximum Ratings indicate limits beyond which damage to the device may occur Operating Ratings indicate conditions for which the device is functional but do not guarantee specific performance limits Electrical Characteristics state DC and AC electrical specifications under particular test conditions which guarantee specific performance limits This assumes that the device is within the Operating Ratings Specifications are not guaranteed for parameters where no limit is given however the typical value is a good indication of device performance Note 2 For operation in ambient temperatures above 25 C the device must be derated based on a 150 C maximum junction temperature and thermal resistance of 107 C W junction to ambient The actual product may not be the same as displayed in the photographs Page No 4 Ge
54. you select the file Audacity will analyze it and try to guess its format It will guess correctly about 90 of the time so you can try just pressing OK and listening to the result If it is not correct however you can use the options in the dialog to try some other possible encodings At the beginning of your imported track s you may notice a little bit of noise This is probably the file s header which Audacity was not able to parse Just zoom in and select the noise with the Selection Tool and then choose Delete from the Edit Menu Edit ID3 Tags Opens a dialog allowing you to edit the ID3 tags associated with a project for MP3 exporting New Label Track This creates a new Label Track which can be very useful for textual annotation Remove Tracks This command removes the selected track or tracks from the project Even if only part of a track is selected the entire track is removed You can also delete a track by clicking the X in its upper left corner To cut out only part of the audio in a track use Delete or Silence Add Label at Selection This menu item lets you create a new label at the current selection You can title the label by typing with the keyboard and then hitting Enter when you re done Add Label at Playback Position This menu item lets you create a new label at the current location where you are playing or recording Do this if you want to mark a certain passage while you re listening to it You can title th
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