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Speech Scrambler Circuit

2017-09-02 09:55  
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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

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

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