US PATENT SUBCLASS 380 / 19
.~.~ Encrypting of accompanying audio signal

Current as of: June, 1999
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380 /   HD   CRYPTOGRAPHY

9  DF  ELECTRIC SIGNAL MODIFICATION (E.G., SCRAMBLING) {18}
10  DF  .~ Video {10}
19.~.~ Encrypting of accompanying audio signal

DEFINITION

Classification: 380/19

Encrypting of accompanying audio signal:

(under subclass 10) Subject matter which modifies an audio signal so as to render the sound unintelligible in a conventional receiver.