[App_rpt-users] USB fob choppy/stuttering audio

[Rob Noll]

Well here’s the odd thing – I put the fob in a Windows machine and used an earpiece while streaming audio to it as a regular sound card.  It seemed to handle it fine.  So the issue does not seem to be a bad fob, and the issue does not seem to be asterisk (as evidenced by using the Android app to listen to the audio stream, where it sounds fine).  It seems to be specifically related to the asterisk audio stream to the USB device.  I’d really like to try Bob’s suggestion of double checking the USB port configuration, but I can’t find any info on the syntax of the device string.  I’d also like to try changing the sampling rate asterisk is using for the USB audio stream, but I haven’t been able to find any info on how to change it.

 

From: App_rpt-users <app_rpt-users-bounces at lists.allstarlink.org> On Behalf Of Mike
Sent: Sunday, March 31, 2019 12:22
To: app_rpt-users at lists.allstarlink.org
Subject: Re: [App_rpt-users] USB fob choppy/stuttering audio

 

If you have put the same FOB in as many machines for a test as you say you have, with same results...

...'it's the FOB'. 

Use one like it or one different.

...mike/kb8jnm

On 3/31/2019 12:18 PM, Rob Noll wrote:

Unfortunately, I don’t have one.  I’d rather not start sinking money into replacing things without knowing the root cause.

 

From: App_rpt-users  <mailto:app_rpt-users-bounces at lists.allstarlink.org> <app_rpt-users-bounces at lists.allstarlink.org> On Behalf Of Mike
Sent: Sunday, March 31, 2019 12:15
To: app_rpt-users at lists.allstarlink.org <mailto:app_rpt-users at lists.allstarlink.org> 
Subject: Re: [App_rpt-users] USB fob choppy/stuttering audio

 

Try other FOB with a cm108

 

...mike/kb8jnm

On 3/31/2019 11:58 AM, Bob Pyke 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 <mailto: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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