US PATENT SUBCLASS 381 / 23
.~.~.~.~ With encoder

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  DF  .~.~.~ 4-2-4 {2}
23.~.~.~.~ With encoder

DEFINITION

Classification: 381/23

With encoder:

(under subclass 21) Subject matter where the four independent sound signals are combined or coded to give two complex signals.