US PATENT SUBCLASS 381 / 71.14
.~.~ Tonal noise or particular frequency or band

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}
71.14.~.~ Tonal noise or particular frequency or band

DEFINITION

Classification: 381/71.14

Tonal noise or particular frequency or band:

(under subclass 71.8) Subject matter in which the noise cancellation system is particularly designed to either eliminate noise having a high degree of underlying periodicity or process noise at a particular frequency or within a limited or particular frequency band.