US PATENT SUBCLASS 381 / 13
.~.~.~.~ Antinoise

Current as of: June, 1999
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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

1  DF  BINAURAL AND STEREOPHONIC {8}
2  DF  .~ Broadcast or multiplex stereo {2}
3  DF  .~.~ FM final modulation {1}
4  DF  .~.~.~ AM subcarrier {7}
13.~.~.~.~ Antinoise

DEFINITION

Classification: 381/13

Antinoise:

(under subclass 4) Subject matter having provision for the reduction or elimination of an unwanted signal.

SEE OR SEARCH CLASS

455, Telecommunications,

50.1+, 63+, 222+, 283+, and 296+ for noise elimination in radio communications in general.