US PATENT SUBCLASS 381 / 71.8
.~ Counterwave generation control path

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.~ Counterwave generation control path {5}
71.9  DF  .~.~> Nonacoustically derived reference signal
71.11  DF  .~.~> Adaptive filter topology
71.12  DF  .~.~> Algorithm or formula (e.g., LMS, Filtered-X, etc.)
71.13  DF  .~.~> Analog or nonadaptive
71.14  DF  .~.~> Tonal noise or particular frequency or band

DEFINITION

Classification: 381/71.8

Counterwave generation control path:

(under subclass 71.1) Subject matter having either a feedback or feedforward circuit or a sequence of computations to generate the out-of-phase replica of the offending noise.