Eric asked,
>I'll try again. I am talking about the relationship between the recorded
>sounds. Not how to get rid of any particular sound. In the real world
>there are two sounds one that is wanted one that is not. Upon recording the
>unwanted sound overrides the wanted sound so much that it is inaudible.
>What I want to know is if the unwanted sound is filtered out, will the
>wanted sound appear, or is it lost.
It depends on whether the sounds are really separate in frequency
content, and whether there was no distortion in the recording
process. Almost all sounds are complex with harmonics and noise
included, so filtering out the main frequencies will still leave all
the harmonics and noise content that may overlap what you're trying
to hear. Distortion in the recording process will "spread" the sounds
all over the spectrum and make it impossible to separate them by
filtering.
I have been very pleased to discover that with digital recording,
filtering works better than it ever did in analog, because the
distortion is so low. I've found I can high-pass filter quite high
levels of airplane or wind noise, as long as it didn't distort, and
leave the track sounding amazingly clean.
Try it.
-Dan Dugan
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