US PATENT SUBCLASS 381 / 20
.~.~ Matrix

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.~.~ Matrix {1}
21  DF  .~.~.~> 4-2-4 {2}

DEFINITION

Classification: 381/20

Matrix:

(under subclass 19) Subject matter where the four independent sound signals are either (1) combined or coded to give one or more complex signals or (2) one or more complex signals are combined or decoded to recover the four independent sound signals.