[pulseaudio-discuss] Pulse Audio 4.0 gets killed by 300 Hz tone...never recovers

Robert Krakora rob.krakora at messagenetsystems.com
Mon Jun 24 14:15:22 PDT 2013


I had 'resample-method' set to 'speex-float-1' when it was previously set
to the default which I believe is 'speex-float-3'.  I meant to set it to
'speex-float-10' to see if the "motor-boating"
 would go away...looks like I forgot the '0'.  The wave files over SIP via
Asterisk 11.4 now sound really smooth going from 44.1->8->44.1...maybe it
was the up-sampling that was killing me.  With a better re-sample algorithm
the motor-boating appears to have disappeared with only a sacrifice of 15%
CPU on the dual core Atom with which I am working.  If this was indeed the
problem, I am going to feel really stupid getting you guys involved.  :-(
Thanks for your prompt responses.

Best Regards,


On Mon, Jun 24, 2013 at 3:25 PM, Thomas Martitz <kugel at rockbox.org> wrote:

> Am 24.06.2013 21:03, schrieb Tanu Kaskinen:
>  On Mon, 2013-06-24 at 11:36 -0400, Robert Krakora wrote:
>>> Basically, the 300Hz tone "motor boats" when played over SIP via
>>> Asterisk.
>>> Every tone that previously played well over SIP via Asterisk then also
>>> "motor boats".
>> (Please don't top-post.)
>> If you record from the alsa sink while this motor-boating is happening,
>> is the audio in the recorded file fine? You can record with for example
>> this command:
>>       parecord --device=NAME_OF_THE_MONITOR_**SOURCE > ~/tmp/test.wav
>> Replace NAME_OF_THE_MONITOR_SOURCE with the name of the monitor source.
>> You can list the available sources with "pactl list sources short",
>> hopefully you're able to figure out which of the sources is the correct
>> one (it's one of those that end with ".monitor").
> And if not you could feed the recorded file to paplay with different
> sample rates to see if resampling isn't done correctly somewhere.
> Best regards
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Rob Krakora
MessageNet Systems
101 East Carmel Dr. Suite 105
Carmel, IN 46032
(317)566-1677 Ext 212
(317)663-0808 Fax
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