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Voice scrambler 2011-01-13

ElectroMaster

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ElectroMaster submitted a new article:

Voice Scrambler - With this circuit you can modify how your voice sounds by changing the pitch of your voice. This ci


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Hmm - if you added digital pots for Tune 1 and 2, connected them to a microcontroller with a pseudo-random number generator, and synced the changes with the other end somehow (maybe via a signal mixed into the audio?)...it might be pretty damn secure.
 
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Sounds neat, theoretically.
Would the circuitry required be more complex than the scrambler circuit shown?
Would it be as easy/difficult to acquire a schematic of the circuitry used in "secure" U.S. military fone lines, or available telefone-signal, scrambler-descramblers?
 
Are there some junction dots missing perhaps? There's no feedback path.
 
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