> I realize that all of you have been doing this at a high level for
> some time
Diane,
Yes, but we may not all admit to it. :-)
I have a routine for de-hissing using the free Audacity 2.0. You
select a sample of the quietest bit of the recording. I then put this
through a bass roll-off filter which gives a rounded slope of 6 dB per
octave (on my web site):
http://www.stowford.org/sounds/eqcurvesadd.txt
HPF800-2-4-6nr
I can post a graphic of the curve if this doesn't make sense.
What this does is to make artifacts disappear into the backgroud noise
without producing tinkling.
In Audacity 2.0*,
http://audacity.sourceforge.net/download/
put this sample into "Effects - Noise Removal", restore the original
(CTRL-Z), select all and run "Noise Removal" with:
-0dB
500 Hz
Try various attack times if you can hear the difference.
If you have an extreme example, take a new sample and do it again
rather than go more than -9dB. It will sound artificial but helps with
species recognition in dodgy recordings.
David
David Brinicombe
North Devon, UK
Cogito cogito ergo cogito sum - Ambrose Bierce
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