Speech Scrambler Circuit

  

Posted on Aug 19, 2012    11222

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 - schematic

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




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