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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/


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