[linux-audio-user] Filtering out sounds?

[carmen]

On Fri Mar 09, 2007 at 05:14:24PM -0500, 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..

but i'd start by looking at mammut, snd, and tapestrea

> 
> 
> > 
> > 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
> > 
>