Hi, <div class="gmail_quote">On Mon, Apr 26, 2010 at 11:57 AM, Edward Hervey <<a href="mailto:bilboed@gmail.com" target="_blank">bilboed@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> <div>On Mon, 2010-04-26 at 10:28 +0200, Nicolas Hennion wrote: > Is there a plugin to filter the noise of an audio stream ? I want to > encode a voice (from a microphone) without the noise environment. </div> We don't have a native one in gstreamer. Maybe there is a ladspa filter you could use through gst-ladspa. The problem with a one-pass filter though is that you have to guess yourself what the proper settings are. If someone's up to it, a great filter to wrap (or rewrite?) into a gstreamer element would be audacity's noise filter which comes in two parts: * A noise profiler : you select a portion of audio which has almost only noise (i.e. when someone isn't speaking for example) </blockquote><div> In theory it should be easy to automate the process by using a VAD algorithm as for itu-t rec. g729 section B.3 (I'm working on an implementation based on the reference code, not yet at a presentable stage so far). </div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> * The actual noise remover, which uses the settings from the noise profiler. </blockquote><div> It's possible to apply an high-pass-filter after the estimates given from the VAD detector of above. Do we already have such an element? I just wish a day was 48 hours long to finish all of this.. Regards </div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> Edward <div> > > Nicolas > ---- > L'imagination est plus importante que la connaissance. > -+- Albert Einstein -+- > ---- </div>> ------------------------------------------------------------------------------ > _______________________________________________ > gstreamer-devel mailing list > <a href="mailto:gstreamer-devel@lists.sourceforge.net" target="_blank">gstreamer-devel@lists.sourceforge.net</a> > <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> ------------------------------------------------------------------------------ _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.sourceforge.net" target="_blank">gstreamer-devel@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> </blockquote></div>