FREQUENTLY ASKED QUESTIONS


Technical Questions

1. What is the best PDA to use with STG for Pocket PC software?
2. Can I use Compaq iPAQ with the STG for Pocket PC software?
3. Can I use the same STG program on the PDA and PC?
4. Do I have to buy a different program to teach students to learn heart, lung and abdominal sounds?
5. How do I set up an electronic stethoscope for use with STG?
6. How do I adjust PDA recording level?
7. The PDA sound is very weak or absent. Can this be improved?
8. Sometimes when I start recording the STG for Pocket PC cannot wake up from sleep. What do I do?
9. What is the best way to listen to sounds when playing back?
10. How often do I need to charge PDA?
11. Can I use the STG for Pocket PC software on any PDA?
12. Which operating systems is ActiveSync compatible with?

File Management

1. What is the duration of the recording?
2. What is the sampling frequency of the recording?
3. What is the format of the sound files?
4. Where are the sound files (recordings) saved on a PDA?
5. How do I manage files on a PDA?
6. How do I manage files on a PC?
7. How do I rename the File on a PDA?
8. How do I move files from a PDA to a PC?
9. How do I move files from a PC to a PDA?
10. How many recordings can be stored on my Pocket PC?
11. How do I delete recordings which are not needed? Must I delete these files individually?
12. Can I synchronize Pocket PC with Mac?
13. Can STG for PC open a file stored on PDA?

Software Registration

1. How do I register software?
2. How many recordings/file openings is allowed in the unregistered version of the software?
3. Do I need to re-register software when I upgrade to a later version?
4. Do I need to register the software separately on every computer the software is installed?

Data Analysis

1. I 'd like to find out how the abnormal heart and lungs sound on the STG.
2. Can I manipulate the recorded sound in the STG software?
3. If I make a mistake editing, how can I fix it?
4. How do I remove an artifact from a recording?
5. How do I normalize the recording?
6. How do I analyze prerecorded sound for the presence of crackles and wheezes?
7. How do I analyze sound in real-time?
8. What is the meaning of colors on the analysis display?
9. How do I digitally filter sound?
10. How do I view Spectrum?
11. How can I understand sound analysis better?
12. Who can I ask if I have other questions?

Technical Questions

Q. What is the best PDA to use with STG for Pocket PC software?
A. You can use the STG for Pocket PC with any PDA running Pocket PC 2002 operating system. The STG for Pocket PC records signal from the PDA microphone. Therefore modified acoustic or electronics stethoscope has to be connected to an external microphone port. External microphone port exist on some PDAs, for example AudioVox Thera distributed by Verizon, T-Mobile Pocket PC Phone, iPAQ h5450, etc.

Q. Can I use Compaq iPAQ with the STG for Pocket PC software?
A. The Compaq/HP model that can be used with an electronic stethoscope is iPAQ h5450 Pocket PC.

Q. Can I use the same STG program on the PDA (pocket computer running Pocket PC 2002) and PC (desktop or notebook running Windows 95/98/Me/NT/2000/XP)?
A. No. The software running on a PDA is called STG for Pocket PC, the software running on a PC is called STG for PC. These are different programs. You can download both of these programs and other software from Downloads.

Q. Do I have to buy a different program to teach students to learn heart, lung and abdominal sounds?
A. No. You can use both STG for Pocket PC and STG for PC to record, visualize, and playback heart, lung, and abdominal sounds.

Q. How do I set up an electronic stethoscope for use with STG?
A. Connect the audio output of the stethoscope to the audio input of the PDA. Adjust the Stethoscope controls for the best sound. Start the STG for Pocket PC software. Adjust the PDA recording volume explained in "How do I adjust PDA recording level?"

Q. How do I adjust PDA recording level?
A. Tap Start > Settings > System Tab > Compaq Audio or Microphone AGC.

On the iPAQ 3700 series disable Automatic Gain Control (AGC) to increase recording level, enable automatic gain control to decrease recording level. On the iPAQ 3800 series enable automatic gain control and choose the gain settings from the drop-out menu - bigger numbers indicate higher gain. Use zoom button to expand the waveform vertically if the signal is still too small.

 

 


 

Q. The PDA sound is very weak or absent.
A. Heart and lung sounds are low frequency sounds. The internal PDA speaker is usually not suited for low pitch sounds reproduction. The adequate sound can be achieved by using any moderately priced ($10-20) headphones or amplified speakers (>$30). To further amplify sound tap on the speaker icon ( in the top left corner) and drag the volume slider up. To amplify sound in the STG software tap Tools > Normalize. If the recording contained any high amplitude artifacts, delete them by highlighting artifacts and taping Tools > Edit > Substitute by Silence, then tap Tools > Normalize. If the recording contained any high amplitude low frequency noise, filter out low frequency vibrations by taping Tools > Filter Sound... > OK, then tap Tools > Normalize.

Q. Sometimes when I start recording the STG for Pocket PC cannot wake up from sleep.
A. PDA is a computer just like a desktop PC. Sometimes PDA needs to redistribute memory or to do something else. In this case you will need to wait until the recording starts. We have found that patience, sometimes in the extent of several minutes has always solved this problem. If the PDA locks up Compaq suggests soft reset as a solution.

Q. What is the best way to listen to sounds when playing back? Should I use the internal speaker, ear buds, headphones or external speakers?
A. Heart and lung sounds are low frequency sounds. The internal PDA speaker is usually not suited for low pitch sounds reproduction. The adequate sound can be achieved by using any moderately priced ($10-20) headphones or amplified speakers (>$30).

Q. How often do I need to charge PDA?
A. We recommend to charge PDA overnight. When the PDA battery completely discharges PDA will irreversibly loose all files except its operating system.

Q. Can I use the STG for Pocket PC software on any PDA?
A. You can use any PDA running Pocket PC 2002 operating system.

Q. Which operating systems is ActiveSync compatible with?
A. ActiveSync is not compatible with Win95 or earlier versions of Windows.

File Management

Q. What is the duration of the recording?
A. 20 seconds. You can record for as long as you like, but you can only view and save last 20 seconds of the recording.

Q. What is the sampling frequency of the recording?
A. 8000 samples per second.

Q. What is the format of the sound files?
A. Standard .wav files.

Q. Where are the sound files (recordings) saved on a PDA?
A. All recorded sounds are saved into the folder named FirstName_LastName (you specify the patients' first name and last name when you tap the Record button), and which is located in My Documents. The name of the file itself consists of the following: FirstName_LastName_Date_Time_StethoscopePosition. (For example, if you are recording Michael Smith on July 22, 2002 at 3:31pm ,and you position the stethoscope on the right side of his back, this recording will be saved in My Documents > Michael_Smith > Michael_Smith_22Jul2002_153135_RB.wav). You can open this file by tapping on the folder icon on the bottom of STG screen. You can also access it by tapping Start > Programs > File Explorer, but tapping on the file there will only play the sound with a Media Player. To view the waveform and analyze the recording you need to open the file from the STG for Pocket PC.

Q. How do I manage files on a PDA?
A. Although you can manage files on a PDA, we advise you to move files to PC for backup and management. PC has a bigger screen and can normally hold more files than a PDA. In addition, when the PDA battery completely discharges PDA will irreversibly loose all files except its operating system.

Q. How do I manage files on a PC?
A. First you need to move files from a PDA to a PC. The procedure is described in "How do I move files from a PDA to a PC?". We suggest that you setup a folder for every patient on the PC and store all data including body sounds, X-rays, and tests results in that folder. You can view the sounds recorded with the STG for Pocket PC or with the STG for PC software on the PC. The latest version of this software can be found in Downloads.

Q. How do I rename the File on a PDA?
A. Tap the Start > Programs > File Explorer. Tap and hold the file you want to change. On the pop-up menu tap Rename. Type in new name.

Q. How do I move files from a PDA to a PC?
A. We recommend to synchronize all files between PDA and PC automatically. To activate automatic file synchronization follow these steps: with PDA connected, open Microsoft ActiveSync software on your PC, click the Options button, on the SyncOptions tab click on the box next to Files, click OK.
To manually move files between PDA and PC follow these steps:
1. With a PDA connected, open Microsoft ActiveSync software on your PC, click the Explore button. The Explorer window will popup. This window shows all files and folders on your PDA.
2. Right-click with your mouse on the file or folder you want to copy to the PC. Click Copy.
3. Right-click anywhere on your PC desktop. Click Paste. Similarly you can paste the file into any folder on your PC.

Q. How do I move files from a PC to a PDA?
A. We recommend to synchronize all files between PDA and PC automatically. To activate automatic file synchronization follow these steps: with PDA connected, open Microsoft ActiveSync software on your PC, click the Options button, on the SyncOptions tab click on the box next to Files, click OK. With automatic synchronization activated you can copy files into Pocket_PC My Documents folder on the desktop - the file will be automatically copied to a PDA.
To manually move files between PC and PDA follow these steps:
1. With PDA connected, open Microsoft ActiveSync software on your PC, click the Explore button. The explorer window will popup. This window specifies the files on your PDA.
2. Right-click with your mouse on the file or folder you want to copy. Click Copy.
3. Right-click in the PDA Explorer window. Click Paste.

Q. How many recordings can be stored on my Pocket PC?
A. Each recording takes 312kB. A PDA with 32MB of free memory should comfortably hold over 100 recordings.

Q. How do I delete recordings which are not needed? Must I delete these files individually?
A. On the PDA connected to a PC that automatically synchronizes files you can delete files from the synchronization folder - files will be automatically deleted from the PDA.
On the PDA connected to a PC that does not automatically synchronize files, open Microsoft ActiveSync software on your PC, click the Explore button, delete the files on the explorer window.
On the PDA not connected to a PC tap the Start > Programs > File Explorer. Tap and hold the file you want to delete. On the pop-up menu tap Delete.

Q. Can I synchronize Pocket PC with Mac?
A. Yes. All required software and detailed instructions can be found at PocketMac.net or at CEWindows.net.

Q. Can STG for PC open a file stored on PDA?
A. No. The STG for PC cannot directly open a file stored on a PDA. To open a sound file on a PC, copy the file from the PDA to the PC first.

Software Registration

Q. How do I register software?
A. When you first try to record or open a file (Tap record icon or folder icon on the bottom of STG screen), a registration screen will pop up. The registration screen shows your DeviceID. Go to www.stethographics.com/registration and fill out a registration form. You will also need a Proof of Purchase number that you should have received with your software. Upon completion of the registration form, you will receive the Unlock Code that will activate your software.

Q. How many recordings/file openings is allowed in the unregistered version of the software?
A. Currently, an unregistered version of the software cannot be used.

Q. Do I need to re-register software when I upgrade to a later version?
A. No. You only need to register the software once for the PDA and once for the PC.

Q. Do I need to register the software separately on every computer the software is installed?
A. Yes.

Data Analysis

Q. I'd like to find out how the abnormal heart and lungs sound on the STG.
A. You can download examples of normal and abnormal heart and lungs sounds from Downloads.
To listen to these sound with the STG for Pocket PC, copy files to the PDA. Learn here "How to move files from a PC to a PDA?".

Q. Can I manipulate the recorded sound in the STG software?
A. Yes. The STG software allows you to edit sound. Tap Tools > Edit.

Q. If I make a mistake editing, how can I fix it?
A. Tap Tools > Edit > Undo.

Q. How do I remove an artifact from a recording?
A. Highlight the artifact by dragging the stylus over the artifact. Tap Tools > Edit > Substitute by Silence.

Q. How do I normalize the recording?
A. Normalization rescales signal to 100% of .wav file dynamic range. Clean sound up from high amplitude artifacts. Tap Tools > Normalize.

Q. How do I analyze prerecorded sound for the presence of crackles and wheezes?
A. Clean the recording from artifacts. Tap Tools > Count Crackle and Wheezes. This procedure identifies crackles and wheezes in all of the 20 seconds of a recording. Drag stylus over the interval of interest, for example one breath, to calculate crackle and wheeze rates on that interval.

Q. How do I analyze sound in real-time?
A. To activate real-time crackle and wheeze count tap Tools > Recording Options…. On the Recording Options Dialog check Analyze Crackles, Wheezes in real time, tap OK.

Q. What is the meaning of colors on the analysis display?
A. Fine crackles are marked in green, coarse crackles are marked in blue, wheezes are marked in red, and rhonchi are marked in yellow.

Q. How do I digitally filter sound?
A. Tap Tools > Filter Sound…, specify filter properties, tap OK.

Q. How do I view Spectrum?
A. Tap the Hz (Frequency Display) button, the spectrum of 20 seconds is displayed. To view spectrum of an interval less than 20 second, highlight the interval by dragging stylus over the interval, tap the Hz button.

Q. How can I understand sound analysis better?
A. You can follow the Sound Analysis Tutorial described at STG for PC

Q. Who can I ask if I have other questions?
A. Email us at support@stethographics.com