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Posted by Jan Panteltje on 04/28/07 12:37
This has likely happened to many of us, bad hum in audio.
For Linux users, I found a program here:
http://www.abelian.demon.co.uk/humfilt
and basically modified it so it accepts a frequency, and works with raw and
wave format files (.wav), you can find it here:
http://panteltje.com/panteltje/xpequ/humfilter-0.1.tgz
That should make it portable, so maybe somebody can port it to MS soft.
For now it is only mono, but there is no reason why you could not split and
apply it twice.
Basically it is a comb filter, so if you specify 60.1 Hz, it will also
filter out 120.02, 180.03, etc etc..
It is _VERY_ effective! No detectable hum left.
Just run it a couple of times with slightly different frequencies to
find the one that attenuates the hum most, and then write a new wavefile.
There is a loss of sound quality associated with this, but that can be acceptable,
especially on speech, and could rescue a recording that would otherwise be not
usable.
Worked for me.
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