[App_rpt-users] Distorted audio in app_rpt/Allstar

George Csahanin george at dyb.com
Wed Sep 11 23:41:53 EDT 2013

10-4, figured that out long time ago, but all the interest in using DSP in this and I thought it would work. It might on a different platform. I opened a Mantis ticket on it a few years ago. But it really is a reason to stick with PL decode and squelch as done by Motorola and GE, why re-invent the wheel? I have one remote “private” node using a HT10 and DSP. Works fine for what it is. 


From: Bryan D. Boyle 
Sent: Wednesday, September 11, 2013 12:56 PM
To: George Csahanin 
Cc: Kevin Custer ; Andreas Pleschutznig ; app_rpt-users at ohnosec.org 
Subject: Re: [App_rpt-users] Distorted audio in app_rpt/Allstar

DSP takes a significant amount of horsepower.  Ya don't get something for nothing; reading a hardware status bit or two is a lot less intensive at the expense of additional wiring and configuration statements in the config files than decoding the stream, deriving the signals, etc.  any overhead in doing so is bound to have an effect on other streams going on at that time.

and we humans don't process breaks in audio as we do with visual perceptions.

Sent from my iPhone 5...small
keyboard, big fingers...please
forgive misspellings...

On Sep 11, 2013, at 13:44, "George Csahanin" <george at dyb.com> wrote:

  I have that exact problem if I use DSP, moved to COS and PTT on DB25 and it stops. Did this in every case I tried, though the only platform I used was a D945 or D201 Intel board.

  Ran 1GB of RAM and CPU is whatever a D945 is. 


  From: Kevin Custer 
  Sent: Wednesday, September 11, 2013 11:45 AM
  To: Andreas Pleschutznig 
  Cc: app_rpt-users at ohnosec.org 
  Subject: Re: [App_rpt-users] Distorted audio in app_rpt/Allstar

  On 9/11/2013 12:20 PM, Andreas Pleschutznig wrote:

    Best I can describe the effect is that the audio is time sliced in 20ms packets and every other packet is missing, left out. and it does not happen when audio is especially loud or quiet. Sometimes it happens on the time announcements, which are absolutely perfect 99% of the time. 

  Sounds to me like a computer with too little RAM or too little CPU horsepower.

  When you run the top command, is it using swap memory?  If so, that's bad...and you need more RAM.


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