[pulseaudio-discuss] External microphone noise reduction

David Henningsson david.henningsson at canonical.com
Tue Feb 10 02:12:35 PST 2015

On 2015-02-10 00:37, Christian Kreibich wrote:
> Hi all,
> I'm using a pair of Sennheiser CX 275 S earbuds. They have a built-in
> microphone that sounds great when using my phone and tablets, but on my
> Fedora 21 laptop suffers from so much static that I basically can't use
> them for calls. Therefore I'm trying to understand whether I can
> convince PulseAudio to better filter out the static. Could somebody
> please describe my options?

Are you sure that the problem is with the mic and not with the laptop?

> I've found scattered mentioning of the module-echo-cancel module on the
> web but can't seem to add it to my config without triggering the
> "between a sink and its monitor" error. I'm not even sure whether an
> echo cancellation module is the right choice for noise reduction, but
> some sources suggested it.
> So, please advise...

PulseAudio does not currently have any noise reduction to filter out 
static. And I wonder if that's the problem - I'd rather investigate the 
laptop input itself.

David Henningsson, Canonical Ltd.

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