[linux-audio-user] Re: Removing AC hum after the fact.

[R Parker]

garbage in, garbage out; sometimes it's a hard learned
lesson. if cutting 300hz and below is causing the loss
of hum and speech then it must be a real bad
recording. i've used the Rezound arbitrary fir filter
to remove air conditioner fans from the U.S. national
turkey and owl callers conferance. of course filtering
is filtering and...

ron

--- Alex Polite <notmyprivateemail at gmail.com> wrote:

> Thanks for all the input.
> 
> I did some experimentation with jamin. Cutting of
> everything below 300
> Hz sure helped alot. But the  harmonics went right
> through the speech
> spectrum so canceling them all out pretty much meant
> canceling the
> speech out as well.
> 
> I found freqtweak and hooked that up. It did 
> produce a very beautiful
> spectrogram but it didn't solve my problem.
> 
> I need something smarter. Something that will  1)
> take a few seconds
> of audio when there's no speech (only hum) and treat
> that as a
> baseline. 2) Reduce the frequencies all over by that
> baseline.
> 
> In effect analyzing the tool would look at the hum
> and create a filter
> that matches it exactly. I guess there's a word for
> that?
> 
> alex
> 
> -- 
> Alex Polite
> http://flosspick.org - finding the right open source
> 


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