[App_rpt-users] USB fob choppy/stuttering audio

[Rob Noll]

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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