US PATENT SUBCLASS 381 / 71.13
.~.~ Analog or nonadaptive

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

71.1  DF  ACOUSTICAL NOISE OR SOUND CANCELLATION {7}
71.8  DF  .~ Counterwave generation control path {5}
71.13.~.~ Analog or nonadaptive

DEFINITION

Classification: 381/71.13

Analog or nonadaptive:

(under subclass 71.8) Subject matter in which the out-of-phase replica is generated using either analog

circuitry or an electrical circuit having a fixed transfer function.

SEE OR SEARCH THIS CLASS, SUBCLASS:

71.11, for the generation of a counterwave using adaptive filter topology.