The Cool Edit noise reduction module comes with
Cool Edit, is far less expensive than the SF NR
add-on, and is suitable for reducing a surprising
variety of background noises (I use multiple fft
files, and experiment a lot...;-). Cool Edit is at:
www.syntrillium.com. The SF NR has features that
make it more suitable for cleaning up old recordings
than the Cool Edit NR, but both should work equally
well for video work...

On Mon, 22 Oct 2001 06:35:53 GMT, "John@Shine-ola" wrote:

>There's a plug-in for Sound Forge called Noise Reduction and I think Cool
>Edit and Goldwave both have something similar. The process is to sample a
>"quiet" section of the audio clip where there's no talking or music. The
>sample is analyzed, polarity reversed and applied back overtop of the clip
>which will in theory, mask the noise.
>
>There are a couple of caveats to this. It only works with any success on
>noise with a very constant frequency or range of frequencies, like an air
>conditioner, or 60 cycle hum. And you'll drop out anything else that happens
>to fall within the range of frequencies that are masked. Apply too much
>noise reduction and you'll wind up with weird feedback that makes speech
>quite robotic-sounding.
>
>Rain is difficult because it's all over the map, sonically speaking. You
>won't likely be able to eradicate it but you should be able to mask enough
>to drop your noise floor significantly if you have the patience to
>experiment a bit.

>"David Kasper" wrote in message
>news:B7F8E7FF.34E7%project1@mindspring.com...
>> I have been told that there is such a thing as audio software that will
>take
>> a sample of unwanted noise, and then remove it completely leaving only the
>> sound that you want. Have you had any experience with applications that
>can
>> do this. Which is best? How well does it work? Specifically, I have
>some
>> background sound of rain falling that I want to get rid of. Equalizing
>> helps, but doesn't quite do it.
>>
>> David Kasper