[arm-allstar] excessive audio delay problem

Tim Sawyer tim.sawyer at mac.com
Mon Apr 20 18:38:50 EST 2015 

Yes, the delay is worse on the Rpi2 than on the BBB. And it’s variable, as Doug said sometimes it’s near zero and other times a few hundred ms. 

Some folks down under tell me the delay is coming from the power saving features. They have a custom kernel (under Raspian) with all the power saving features removed and claim they are not having any of the variable delay issues. 

I have more information if anyone is interested.
--
Tim
:wq

> On Apr 20, 2015, at 12:26 PM, LaRoy McCann <lmccann at dtisp.com> wrote:
> 
> No doubt it will introduce delays into the system.
> 
> I am fairly new to using allstar.  My first experience was with the bbb and it did not have the broadcast delay like the Pi2 does.
> Granted you hear a delay between input and output of the repeater using either bbb or PI2.
> 
> Does this mean the Pi2 is actually that much slower? 
> Maybe the software is not taking advantage of the multi-core processors yet.
> 
> Don't get wrong, I think this is a great system and we are changing out hardware controllers for Allstar.
> My hat goes off to everyone that has made this type of system possible.
> 
> LaRoy McCann, K5TW
> 
> 
> On 4/20/2015 1:55 PM, Cole Cunningham wrote:
>> 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> [mailto: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 <http://www.crompton.com/hamradio>
>> 
>> > Date: Mon, 20 Apr 2015 12:38:54 -0500
>> > From: lmccann at dtisp.com <mailto:lmccann at dtisp.com>
>> > To: arm-allstar at hamvoip.org <mailto: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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>> > 
>> > Visit the BBB web page - http://www.crompton.com/hamradio/BeagleBoneBlackAllstar/ <http://www.crompton.com/hamradio/BeagleBoneBlackAllstar/>
>> > 
>> 
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>> 
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>> Visit the BBB web page - http://www.crompton.com/hamradio/BeagleBoneBlackAllstar/ <http://www.crompton.com/hamradio/BeagleBoneBlackAllstar/>
> 
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