US PATENT SUBCLASS 84 / 728
.~.~.~.~.~ Noise reduction (e.g., error prevention)

Current as of: June, 1999
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84 /   HD   MUSIC

1  DF  INSTRUMENTS {9}
600  DF  .~ Electrical musical tone generation {5}
723  DF  .~.~ Transducers {9}
725  DF  .~.~.~ Electromagnetic {2}
726  DF  .~.~.~.~ String {2}
728.~.~.~.~.~ Noise reduction (e.g., error prevention)

DEFINITION

Classification: 84/728

Noise reduction (e.g., error prevention):

(under subclass 726) Subject matter wherein circuitry is provided to reduce electrical noises, transients or unwanted disturbances.

SEE OR SEARCH THIS CLASS, SUBCLASS:

621, for noise reduction with digital storage.

683, for noise reduction with selecting circuit of analog oscillators.

691, noise reduction with analog oscillators.

SEE OR SEARCH CLASS

375, Pulse, or Digital Communications,

284, and 285 for antinoise or distortion systems using alternating or pulsating current. 381, Electrical Audio Signal Processing Systems and Devices, appropriate subclass acoustical noise or sound cancellation;

94.1+, for noise or distortion suppression.