US PATENT SUBCLASS 381 / 71.11
.~.~ Adaptive filter topology

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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}
71.11.~.~ Adaptive filter topology

DEFINITION

Classification: 381/71.11

Adaptive filter topology:

(under subclass 71.8) Subject matter having the functional interconnections between two or more transfer function models which make up an overall circuit or computational arrangement designed to generate a counterwave.

SEE OR SEARCH THIS CLASS, SUBCLASS:

71.13, for the generation of the out-of-phase replica using analog circuitry or non-adaptive filter.

SEE OR SEARCH CLASS

708, Electrical Computers: Arithmetic Processing and Calculating,

322+, for adaptive digital filter structures, per se.