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Posted by Richard Crowley on 10/03/83 11:38
"P.C. Ford" wrote...
> I'm doing a video for a client. We requested that they shut off the
> overhead heating ducts when we were shooting. The facilities people
> did not. The sound is noticeable, though one tunes it out after a
> while. However, it would certainly be better if I could get rid of it.
>
> I have Sound Forge 6 but have used it to do really simple stuff.
> Otherwise I am pretty much a newby. We have some "room tone"; it's
> only the sound of fan/room.
>
> I've read some stuff but can't seem to head off in the correct
> direction. Can someone give me a push?
Adobe Audition has a rather good pattern noise reduction
(where you identify a section of isolated noise which you
wish to remove). I believe the download trial version is
full-featured for 30 days.
Don't expect magic, however, from ANY product (even the
multi-thousand-dollar ones). It never works in real life like
it does on (fictional/special-effects) TV & movies. It is always
easier to mitigate at the time of recording than it is to try to
remove it in post-production. No matter how hard it might
seem to eliminate at the time of recording.
After-the-fact noise reduction always results in degradation
of the desired sounds. It is your judgement call where to
draw the line between enough noise-reduction and too much
signal-degradation.
Another method of getting a better SNR (Signal-to-Noise
Ratio) is to get the microphone closer to the source so that
the ratio of desired sound swamps out the undesired noise.
This is how you can hear insane reporters standing in front of
a live TV camera in a Cat-5 hurricane. They are practically
swallowing the microphone. :-)
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