US PATENT SUBCLASS 380 / 39
.~.~ 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}
38  DF  .~ Frequency shift or inversion {1}
39.~.~ With plural band pass filters

DEFINITION

Classification: 380/39

With plural band pass filters:

(under subclass 38) Subject matter which divides the signal into a plurality of subbands by filtering prior to a frequency shift or inversion.