[App_rpt-users] USB fob choppy/stuttering audio

[Rob Noll]

On that note Bob, do you know the correct format for the port line in the 
usb tune config file?


From: Bob Pyke k6ecm1 at gmail.com
Sent: March 31, 2019 12:02:09
To: Users of Asterisk app_rpt app_rpt-users at lists.allstarlink.org
Subject: Re: [App_rpt-users] USB fob choppy/stuttering audio


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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