US PATENT SUBCLASS 381 / 5
.~.~.~.~ Four discrete channels

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}
5.~.~.~.~ Four discrete channels {1}
6  DF  .~.~.~.~.~> Having transmitter

DEFINITION

Classification: 381/5

Four discrete channels:

(under subclass 4) Subject matter where the independent sound signals are four in number.

SEE OR SEARCH THIS CLASS, SUBCLASS:

19+, for quadrisonic sound systems in general.