[arm-allstar] excessive audio delay problem

[Cole Cunningham]

Isn't this type of delay inevitable when digitizing and then converting back
to analog?  Flat panel TV's have all sorts of delay, noticable if you see
the same programming source on two different capability or model sets.

 

I have a BBB set up running a remote base into a local repeater and when I
compare talking into the BBB via the Allstar web transceiver and what I hear
on the repeater, there's a BIG delay.  100's of milliseconds.  Same when
listening to the repeater direct and also via the computer.

 

AFAIK the only solution is processing speed.  At all points in the digital
system.

 

Cole, AA7RD

 

From: arm-allstar-bounces at hamvoip.org
[mailto:arm-allstar-bounces at hamvoip.org] On Behalf Of LaRoy McCann
Sent: Monday, April 20, 2015 11:47 AM
To: BeagleBone Black ARM Allstar
Subject: Re: [arm-allstar] excessive audio delay problem

 


Yeah, you learn to pause before un-keying.
It is worse sometimes than others.

I have tried real hard to make it do that on the bbb and it has not done it.
I was wrong on the radio on the bbb.  At one time (pre lightening strike)I
had a Master II with a cat 1000.  Right now it is not my 80's hamtronics
exciter with the latest synthesized receiver on the bbb.

I wonder if different radios introduce different delays.  I hope to get a
chance this week to replace the bbb with a Pi2 and we'll see what difference
that makes.

Thanks for the info.

LaRoy McCann, K5TW


On 4/20/2015 1:19 PM, Doug Crompton wrote:

LaRoy,

   The problem you are seeing has been a problem in Allstar for years. It
tends to be worse on a slower processor like the BBB or RPi2. We are
currently working on a fix which will benefit all Allstar users. However for
right now there is no cure. Setting rxaudiodelay to eliminate squelch tail
in simpleusb.conf would make it worse as it would add to the delay. It is
variable meaning at times it is almost lockstep and at other times several
hundred miliseconds or more delay. Also depending on the receiving radios
recovery time it may be better or worse. Using PL usually helps it as it
slows down RX recovery time. Hang in there we will have a fix in the future.
This is not a problem on a simplex node.

For those that have not experience this what you hear is a last syllable of
your transmission when you release the mike. It can be annoying but is not a
show stopper.

73 Doug
WA3DSP
http://www.crompton.com/hamradio



> Date: Mon, 20 Apr 2015 12:38:54 -0500
> From: lmccann at dtisp.com
> To: arm-allstar at hamvoip.org
> Subject: [arm-allstar] excessive audio delay problem
> 
> I have a Pi2 running on a GE Master Executive II repeater.
> 
> The problem I am seeing is that if I un-key my mobile too quickly, I 
> will hear the last several words that I just spoke being transmitted 
> back from the repeater. Is this board just this slow or is there some 
> audio delay setting somewhere I am missing.
> 
> I have a bbb running on a GE Master II and it works fine. I'm going to 
> try a Pi2 on the Master II to see if it is in the controller but wanted 
> to ask here to see if anyone has experienced the same issue.
> 
> LaRoy McCann, K5TW
> 
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