US PATENT SUBCLASS 381 / 21
.~.~.~ 4-2-4

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

1  DF  BINAURAL AND STEREOPHONIC {8}
19  DF  .~ Quadrasonic {1}
20  DF  .~.~ Matrix {1}
21.~.~.~ 4-2-4 {2}
22  DF  .~.~.~.~> Variable decoder
23  DF  .~.~.~.~> With encoder

DEFINITION

Classification: 381/21

4-2-4:

(under subclass 20) Subject matter where four quadrasonic signals are multiplexed into two more complex signals, then expanded back into four signals.