[App_rpt-users] USB fob choppy/stuttering audio

Tue Apr 2 00:46:27 UTC 2019

Hi Dave,

As requested, output is below.  I’m confused how this might help with audio quality issues – do you mind telling me what sort of clues one would look for?

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Bus 002 Device 002: ID 0d8c:013a C-Media Electronics, Inc. 

Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Rob

From: App_rpt-users <app_rpt-users-bounces at lists.allstarlink.org> On Behalf Of Dave Maciorowski
Sent: Monday, April 01, 2019 20:17
To: app_rpt-users at lists.allstarlink.org
Subject: Re: [App_rpt-users] USB fob choppy/stuttering audio

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 <mailto: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 <mailto: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 <mailto: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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