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

Alexander E. Patrakov patrakov at gmail.com
Mon Jul 25 08:21:25 PDT 2011


> 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.

Alexander E. Patrakov

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