[App_rpt-users] USB fob choppy/stuttering audio

Sat Apr 6 20:49:27 UTC 2019

Hi Rob,

CM109's show up with a different description.  Here's one that have:

Bus 002 Device 014: ID 0d8c:000e C-Media Electronics, Inc. Audio Adapter 
(Planet UP-100, Genius G-Talk)

There were some marked as CM119's.  They cause the same symptom. It was 
worth checking.

73,

   Dave
   WA1JHK

On 4/1/2019 6:46 PM, Rob Noll wrote:
>
> 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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