[App_rpt-users] USB fob choppy/stuttering audio

[Bob Pyke]

I don’t know if this fits your situation, but the only time I’ve had choppy audio is when something in asterisk or Linux is unhappy; most likely asterisk. I’d check your USB related settings (usbradio or simpleusb).

Thanks,
Bob
K6ECM
73


> On Mar 31, 2019, at 7:26 AM, Rob Noll <rob at nollmail.com> wrote:
> 
> Good morning all,
>  
> I’m trying to set up an AllStar node using a USB fob based on the CM119 chip.  I’m having issues with choppy/stuttering audio, particularly on telemetry.  It’s bad enough that it renders the CW ID meaningless.
> My original thought was lack of CPU power, but I have tried it on a Raspberry Pi 2, Pi 3, and several virtual machines on a quad-core PC with identical results.  Also, the choppiness is NOT as bad when using the full USB driver instead of SimpleUSB, which I believe conclusively rules out CPU power.
> I’ve also tried a powered USB hub, thinking that the USB device was not receiving enough power, with no improvement.
> I’ve used the Android mobile app to connect to the node, and the telemetry does not seem to be choppy when listening to it over the app.  While I need to do some more testing to say this conclusively, I do believe at this point that my issue is narrowed down to the USB fob itself and/or the specific audio stream being sent to the device.
> I’m currently searching for a way to alter the sample rate that ASL is sending the audio to the device in.
> Has anyone experienced this, and does anyone have any suggestions?
>  
> Thanks and 73,
>  
> Rob, WX1N
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