Re: [linux-audio-user] background hiss

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Subject: Re: [linux-audio-user] background hiss
From: Jason (
Date: Mon Feb 25 2002 - 08:58:36 EET

The quick and dirty way to do it would be to see if you can get a
recording of just the hiss, which could be coming from anywhere in your
signal chain- it's most likely a little of everything- then invert the
phase on that file and blend back in with the original. It will get rid of
a lot of the hiss, but you'll have to play with the relative levels- and
may have to try a few different recordings if the hiss is irregular- in
order to maximize removal without adversely "effecting" the original.

 I've never tried
that in a linux app since I'm not yet confident enough that I know linux
well enough to do real work on it, but steve harris' site
lists a plugin called harmonic generator that appears to be able to do a
imple phase invert...

Anybody know of a bread and butter phase invert plugin that just inverts
phase? I did a quick search that was by no means exhaustive and didn't
turn up anything. You'd think there'd be an over abundance of that one
given the simplicity of the algorithm.

 On Sun, 24 Feb 2002, author wrote:

> How do you remove background hiss from
> a digital .wav file?
> I recorded a .wav file from a cassette tape
> with a sample rate of 48000, two channels:
> rec -V -r48000 -w -s -c2 my.wav
> Now that I "discovered" what the mixer
> settings do, I've gotten rid of most of
> the distortion, but there is a background
> hiss in the digital wav file.
> The tape does not have this hiss, or, if
> it exists I can't hear it.
> If there a filter I can use to remove it?
> I'm learning ecasound commands, but right
> now I'm better at rec, sox, and play.
> Any advice would be most welcome.
> My knowledge is very limited.

-- - You can pretend we're not here. That's what I do.


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