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Re: after workshop question

Subject: Re: after workshop question
From: Dan Dugan <>
Date: Wed, 26 May 2004 17:20:15 -0700
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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