[pulseaudio-discuss] Need help to enable echo cancel in pulseaudio

Arun Raghavan arun.raghavan at collabora.co.uk
Mon Jul 25 08:24:33 PDT 2011

On Mon, 2011-07-25 at 15:21 +0000, Alexander E. Patrakov wrote:
> ABDUL MOIZ wrote:
> > Hi,
> > 
> >         Thanks for the reply.
> > 
> >       Now I am able to run the pulseaudio daemon with echo cancel source
> >       and
> > sinks without any problem on my ubuntu desktop system. Now I want to
> > enable echo cancel module on my omap4 (PANDA) board. I followed the same
> > steps as i have done for ubuntu desktop. Pulseaudio daemon is working
> > fine but when i tried to load the Echo cancel module, the daemon is
> > getting killed.
> Echo cancellation is a very cpu-intensive process (even on my Core i5) 
> that also involves floating-point operations. I think that omap4 is just 
> not powerful enough to do echo cancellation in software, and I guess 
> that's why your pulseaudio deamon is getting killed for running over the 
> CPU time limit.
> Could you try to verify this theory by uncommenting the "cpu-limit = no" 
> line in daemon.conf? This will lock up your omap4 board, though, if I 
> guessed the reason correctly.

Worth a shot, but from what I know, the echo-cancel module actually
works fine on Pandaboards -- doesn't even drive up CPU scaling.

-- Arun

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