[App_rpt-users] USB fob choppy/stuttering audio

[Dave Maciorowski]

Hi Rob,

Please copy the output from your lsusb command to a reply email. There may be a clue there.

Thanks.

   Dave
   WA1JHK

On 4/1/2019 2:14 PM, Rob Noll wrote:
> Hi Marshall,
>
> Thanks for the thought, but it happens with both a transmitter and with a headset.
>
> Rob
>
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> *From: * 	Marshall Oldham ke6pcv at cal-net.org
> *Sent: * 	April 1, 2019 16:10:38
> *To: * 	'Users of Asterisk app_rpt' app_rpt-users at lists.allstarlink.org
> *Subject: * 	Re: [App_rpt-users] USB fob choppy/stuttering audio
>
>
> Rob,
>
> Based on your comments about the telemetry "not sounding choppy when listening to it over the phone."
>
> It could be that RF from your transmitter is getting into your sound fob.  Do you have a transmitter hooked up to the USB sound fob?
>
> As a test, disable your transmitter and use clip leads to connect a PC amplified computer speaker to your TX audio line and see if you still have choppy audio.
>
> If you do  NOT have choppy audio with the amplified speaker, this surely points to some type of RF getting into your sound fob.
>
> Hope this helps.
>
> 73
>
> Marshall - ke6pcv
>
> *From:*App_rpt-users [mailto:app_rpt-users-bounces at lists.allstarlink.org] *On Behalf Of *Rob Noll
> *Sent:* Sunday, March 31, 2019 7:26 AM
> *To:* app_rpt-users at lists.allstarlink.org
> *Subject:* [App_rpt-users] USB fob choppy/stuttering audio
>
> 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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