Doug Crompton on 26 Jan 2006 17:24:04 -0000

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RE: [PLUG] HTTP file command line download

Ok... thanks for your help that worked fine....

wget, mpg321, sox infile -b -r 8000 outfile

The final result was a 8k rate 8 bit file. It is voice only. This is to be
sent over a radio communications channel and the quality is fine except
for one thing. Either in the original encoding or rate change, or both,
the background or silence noise is to high to do what I want to do.

The recording purposely has a no speaking period but the noise floor is to
high for my broadcast equipment to recognize it. I need to filter, remove
all sound below a certain level. I do not think low/high pass will work
but rather sensing a period of silence below a certain level and inserting
pure silence. Sox has a noise filtering mode but it requires knowing where
there is already silence and then doing a second pass. Since I want to do
this from the command line unattended I don't think this would work. Any


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