[linux-audio-user] Filtering out sounds?

Robin Gareus robin at gareus.org
Fri Mar 9 17:22:52 EST 2007

carmen wrote:
> On Fri Mar 09, 2007 at 11:09:27PM +0100, Robin Gareus wrote:
>> terrence at terrencevak.net wrote:
>>> 	Hmmmm...well it's actually an old tape of all spoken stuff; 
>>> conversations I had while visiting family in Europe.  I want to hang on to 
>>> the other people's voices etc., but mine has changed a bit since then and 
>>> the old sound bugs me.
>> i don't think there is a way to do this from the command line!
>> why cli?  it rather sound like a job you should start up a (graphical)
>> DAW for. or was the cli requirement only for the recording not this
>> particular edit/filtering task?
>> anyway the only way to get it done quickly, just mute your voice during
>> recording.. (hope you were not conversing at the same time as others in
>> the background) - Maybe ecasound allows to assign on/off location
>> markers during recording. I never checked.
>> If you speak at the same time with others it's gets tricky. If the
>> voices have a different pitch (fi. your "old sound" being an allusion to
>> baby-crying in the background) you can reduce the presence of a
>> particular voice with EQing + compression. I don't think there is
>> software out there to automate the task. - audacity might come in handy.
> theres plenty of software that can take a FFT snapshot, wiht a large window size (eg a passage of spoken text). then filter another wave using that as a mask...
> you could also play with a spectral gate, if the voice is obviously louder than everything else. once again you'll get artifacts and sectinsn that didnt hit the threshold..
> it definitely helps to work in an editor that lets you view your waveforms as a spectrogram as well.
> theres lots of choices on windows for both of these things (fft masking, and spectrogram editing). not sure about linux..

freqTweak, jaaa, jace,..

most of it is a little overkill I guess.

>> if you want to get into cli denoising based on a audio-sample:
>> try http://www.saunalahti.fi/%7Emjkoskin/anoi-0.3.tar.gz
>> robin

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