US PATENT SUBCLASS 369 / 89
.~ Quadraphonic

Current as of: June, 1999
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369 /   HD   DYNAMIC INFORMATION STORAGE OR RETRIEVAL

86  DF  STORAGE OR RETRIEVAL OF SPATIALLY RELATED ACOUSTIC SIGNALS (E.G., STEREO) {5}
89.~ Quadraphonic {1}
90  DF  .~.~> Including modulated subchannel signal

DEFINITION

Classification: 369/89

Quadraphonic:

(under subclass 86) Subject matter in which four or more channels are stored or retrieved.