=C2=A0
Thanks for responding David, I will try audacity.
Do you think the batteries in the mic are contributing to the hiss?
Diane
--- In "Avocet" <> wrote:
>
> > 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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