US PATENT SUBCLASS 380 / 40
.~ With plural band pass filters

Current as of: June, 1999
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380 /   HD   CRYPTOGRAPHY

9  DF  ELECTRIC SIGNAL MODIFICATION (E.G., SCRAMBLING) {18}
40.~ With plural band pass filters

DEFINITION

Classification: 380/40

With plural band pass filters:

(under subclass 9) Subject matter which divides the signal into a plurality of subbands by filtering prior to further encryption.