There are some hints on sound quality issues.
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Telephone subscribers can hear themselves through interlocutor / Echo effect on subscriber's radio
1. Stereo Mix
Switch off Stereo Mix in the sound card settings.
2. Sound cards (for control station configuration only)
Dispatcher and radioserver installed on one PC should be using different sound cards. (You should have one additional sound card for each control station)
3. Microphone location
RX station / speakers are too close to the dispatcher's microphone.
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Unacceptable sound quality
1. USB+Audio Cables (for control station configuration only)
Test the cable which connects the control stations and the computer for correct pinouts (link).
2. Microphone sound level
Reduce microphone sound level.
3. MIC Boost
Clear MIC Boost.
4. Basic Hardware Sound Acceleration Level
Configure Hardware Sound Acceleration Level and set it to Basic level. Basic hardware acceleration is configured in the DirectX Diagnostic Tool window (go to Start menu, click on Run, type dxdiag). Go to Sound tab and specify Hardware Sound Acceleration Level.
5. Microphone
Check if the microphone is working. Record an audio file by the Sound Recorder application (Start Menu –> All Programs –> Entertainment –> Sound Recorder) and play it back. Make sure the sound is recorded and you can play it back. If quality of record is not plausible, try another microphone.
6. Sound card Drivers
Install newest sound card drivers from it's manufacturer's site.
7. SmartPTT Software
Update SmartPTT software. It may contain some fixes in sound processing unit.
8. Windows Firewall
Disable Windows Firewall.
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No sound
1. USB+Audio Cable (for control station configuration only)
Test the cable connecting the control stations and the computer for correct pinouts (USB+Audio).
2. Microphone
Check if the microphone is working. Record an audio file by the Sound Recorder application (Start Menu –> All Programs –> Entertainment –> Sound Recorder) and play it back. Make sure the sound is recorded and you can play it back. If quality of record is not plausible, try another microphone.
3. Audio Input and Audio Output
Make sure that the Audio Input and Output are selected correctly in the sound settings of SmartPTT system.
4. Amount of Sound cards required (for control station configuration only)
Make sure you have a sound card on your computer. If SmartPTT Dispatcher and Radio Server are installed on one computer, there must be two sound cards (this is true if there is only one control station connected to the Radio Server). Each additional control station connected to the Radio Server requires additional sound card (if the control stations is used for transmitting both data and voice).
5. Microphone Audio Setting
Check if Microphone Audio Setting is available in SmartPTT Dispatcher.
If Microphone Audio Setting is not available, open the Sound settings window in SmartPTT Dispatcher (Settings -> Sound). In the Audio Input section, next to the Input Line select Microphone and then Finish.
If Microphone Audio Setting is still unavailable or Microphone was already selected for Input Line, select Recording Level and click Finish.
9. Windows Firewall
Disable Windows Firewall.
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Sound quality becomes worse and worse
1. Acoustic Echo Cancellation
Go to Start menu of the PC and select Control Panel. Then click on your Sound card icon and check the settings. Make sure that Acoustic Echo Cancellation is unselected
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