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[Discuss-gnuradio] Simple gr goodies - audio filter and scrambler
From: |
Chuck Swiger |
Subject: |
[Discuss-gnuradio] Simple gr goodies - audio filter and scrambler |
Date: |
Mon, 23 Aug 2004 08:08:27 -0400 |
Gang - Here's a couple of simple application that use no hardware other than an
audio card. I'm really suprised the scrambler works but the tools make it
pretty easy.
Audio Filter - specify low freq, high freq and width of skirts (steeper
skirts = more cpu)
e.g. $./filter.py 400 1800 100 for very constricted audio:
Audio scrambler - multiplies the audio stream with gaussian noise, saving
both noise
and product to two files. Verify the product file is unintelligible.
Descramble by dividing
the product file by the noise file and get intelligible audio back. Run
$./scramble.py and
hit enter when done recording. Play the scrambled audio with $./play.py to
verify it's
noise. Descramble with ./$descramble.py plays the audio.
Both projects are at: http://www.widomaker.com/~cswiger/gnuradio/
--Chuck
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