[App_rpt-users] USB fob choppy/stuttering audio
Rob Noll
rob at nollmail.com
Mon Apr 1 20:14:46 UTC 2019
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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