[App_rpt-users] USB fob choppy/stuttering audio

[Rob Noll]

I’m looking for assistance solving this issue, and particularly how to check the device string in the configuration file, and/or how to change the sample rate of the audio stream sent to USB.

 

I’m not sure why you chose to unload on me for what you seem to be claiming is a well known issue, but from my searching does not appear to be well publicized.  Nor am I sure what I may have said that would cause antagonization.  I was merely looking for some assistance with an issue that I hoped maybe others had encountered and knew of a cause or solution.

 

That said, here are some answers to your questions:

>>> why does it seem that most everyone has gone this route against the above sage wisdom

Where is this sage wisdom?  I’m new to ASL.  I read the wiki page.  I saw no warnings against USB, in fact, I there were links to USB devices.

 

>>> rather than using something more akin an e&m interface like the pci radio cards Jim designed

I don’t know Jim, don’t know where to buy his products, and there are no PCI interfaces on a Raspberry Pi.

 

>>> the interface boards that plugged into an fxs? Port and broke out e&m, providing keying by polarity reversal of the battery voltage

An fxs port is an analog telephone port, isn’t it?  Again, not available on a Raspberry Pi, and although I’m sure I could come up with a way to key the transmitter in question based on a reverse polarity battery signal, that does not seem like a very straightforward undertaking.

 

>>> Apparently usb not so much and apparently this is a long standing problem with usb

I disagree.  I’ve used plenty of USB audio devices in the past with no problems whatsoever.  In fact, this very device works fine when used as a sound card on a PC.  So if there are any longstanding issues, it would appear from a cursory glance to be with asterisk’s passing of the audio.

 

 

From: App_rpt-users <app_rpt-users-bounces at lists.allstarlink.org> On Behalf Of Eric Fort
Sent: Sunday, March 31, 2019 12:49
To: Users of Asterisk app_rpt <app_rpt-users at lists.allstarlink.org>
Subject: Re: [App_rpt-users] USB fob choppy/stuttering audio

 

 

On Mar 31, 2019, at 9:08 AM, Bob Pyke <k6ecm1 at gmail.com <mailto:k6ecm1 at gmail.com> > wrote:

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

 

		

 

I have heard many times of the problems using usb with asterisk and app_rpt. So why does it seem that most everyone has gone this route against the above sage wisdom rather than using something more akin an e&m interface like the pci radio cards Jim designed and built or the interface boards that plugged into an fxs? Port and broke out e&m, providing keying by polarity reversal of the battery voltage. Both solutions work rock solid with no issues. Apparently usb not so much and apparently this is a long standing problem with usb. In thinking about this I’m also curious if the design files for the pci radio interface boards may be available as they’d likely be a good start for an update to a more current interface standard. 

 

Eric 

Af6ep 

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