[App_rpt-users] USB fob choppy/stuttering audio

[Bob Pyke]

PS. Also make sure the USB interface matches. I’ve had USB issues cause this choppiness, fixed by changing ports. (use lsusb)

Thanks,
Bob
K6ECM
73


> On Mar 31, 2019, at 8:58 AM, Bob Pyke <k6ecm1 at gmail.com> wrote:
> 
> 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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