another audio question, was: Re: adding silence to audio files, notx Debian Questions

Gregory Nowak greg at
Thu Aug 7 17:19:13 EDT 2008

Hash: SHA1

Hi Chuck and all.

Since we're on the topic of processing audio, I have a question of my
own. Let's say, for example, that I have a file of someone
demonstrating something, and this person talking is in the foreground,
and slightly in the background is the sound of the device being
demonstrated. What I was wondering is if it is possible to muffle the
speech in the foreground, or get rid of it altogether, and bring the
background sound into the foreground, making it the dominant sound, or
making it the only sound being heard? 

I imagine what I want to do could be done, in whole, or in part, by
applying frequency filters. However, I'm also not a sound geek, so
don't know how I'd figure out the frequencies I need to filter, though
from reading the sox man page, I think I do understand how to apply
the high-pass/low-pass filters once I know what frequency ranges to
filter out, and which filter to apply, high or low. Thanks.


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