Audio noise filter ?
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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.
Nicolas ---- L'imagination est plus importante que la connaissance. -+- Albert Einstein -+- ---- ------------------------------------------------------------------------------ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
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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. 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) * The actual noise remover, which uses the settings from the noise profiler. Edward > > Nicolas > ---- > L'imagination est plus importante que la connaissance. > -+- Albert Einstein -+- > ---- > ------------------------------------------------------------------------------ > _______________________________________________ > gstreamer-devel mailing list > [hidden email] > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel ------------------------------------------------------------------------------ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
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Edward Hervey wrote:
> 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. >> > > 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) > * The actual noise remover, which uses the settings from the noise > profiler. > > Edward > SoundFX/Amiga was a multiband noisegate. A Noisegate just watches the amplitude and sets the output to silence when the signal falls below a threashold. Opening and closing the gate is usualy done with a small fade. Now if this is done on several frequency bands, it works quite nicely even for non speech signals. Stefan > >> Nicolas >> ---- >> L'imagination est plus importante que la connaissance. >> -+- Albert Einstein -+- >> ---- >> ------------------------------------------------------------------------------ >> _______________________________________________ >> gstreamer-devel mailing list >> [hidden email] >> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel >> > > > > ------------------------------------------------------------------------------ > _______________________________________________ > gstreamer-devel mailing list > [hidden email] > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel > ------------------------------------------------------------------------------ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
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In reply to this post by Edward Hervey
Hi,
On Mon, Apr 26, 2010 at 11:57 AM, Edward Hervey <[hidden email]> wrote:
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). * The actual noise remover, which uses the settings from the noise 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
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