Speech Scrambler Circuit

Posted on Aug 19, 2012

Using digital techniques, this circuit accomplishes the frequency-inversion algorithm via digitization of the audio, inversion of the sign of every alternate sample, and D/A conversion of the resultant data. The result is an inverted frequency spectrum.

Speech Scrambler Circuit
Click here to download the full size of the above Circuit.

Because the circuit has two channels, this system can be used in a full duplex two-way telephone scrambler.

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