[App_rpt-users] USB fob choppy/stuttering audio

Sun Mar 31 16:16:12 UTC 2019

I did let ASL set it, but without knowing the syntax of the string (in my case, “devstr=2-1:1.0”), how do I check it to make sure?  I’m confused on how to follow the suggestion to change ports or verify the correct format.

As far as not using USB…  I’m not aware of any other viable option for the project at hand, but I’m open to any suggestions.

From: App_rpt-users <app_rpt-users-bounces at lists.allstarlink.org> On Behalf Of Bob Pyke
Sent: Sunday, March 31, 2019 12:09
To: Users of Asterisk app_rpt <app_rpt-users at lists.allstarlink.org>
Subject: Red: [App_rpt-users] USB fob choppy/stuttering audio

Sorry, not with ASL. I found it best to let it set it, but I check to make sure. ASL is much better than the original based on CentOS. I’ve had the Linux mix it up, but not had that issue since DIAL and ASL.

As Jim has said many times, “friends don’t let friends do USB” :-)

Thanks,

Bob

K6ECM

73

On Mar 31, 2019, at 9:03 AM, Rob Noll <rob at nollmail.com <mailto:rob at nollmail.com> > wrote:

On that note Bob, do you know the correct format for the port line in the usb tune config file? 

  _____  

From: 

Bob Pyke  <mailto:k6ecm1 at gmail.com> k6ecm1 at gmail.com

Sent: 

March 31, 2019 12:02:09

To: 

Users of Asterisk app_rpt  <mailto:app_rpt-users at lists.allstarlink.org> app_rpt-users at lists.allstarlink.org

Subject: 

Re: [App_rpt-users] USB fob choppy/stuttering audio

PS. Also make sure the USB interface matches. I’ve had USB issues cause this choppiness, fixed by changing ports. (use lsusb)

Thanks,

Bob

K6ECM

73

On Mar 31, 2019, at 8:58 AM, Bob Pyke < <mailto:k6ecm1 at gmail.com> k6ecm1 at gmail.com> wrote:

I don’t know if this fits your situation, but the only time I’ve had choppy audio is when something in asterisk or Linux is unhappy; most likely asterisk. I’d check your USB related settings (usbradio or simpleusb).

Thanks,

Bob

K6ECM

73

On Mar 31, 2019, at 7:26 AM, Rob Noll < <mailto:rob at nollmail.com> rob at nollmail.com> wrote:

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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