US PATENT SUBCLASS 84 / 683-- .~.~.~.~ Noise reduction (e.g., error prevention)

US PATENT SUBCLASS 84 / 683
.~.~.~.~ 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}
671	DF	.~.~ Electric analog oscillators {9}
678	DF	.~.~.~ Selecting circuits {9}
683		.~.~.~.~ Noise reduction (e.g., error prevention)

DEFINITION

Classification: 84/683

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

(under subclass 678) Subject matter wherein circuitry is provided to reduce electrical noise, transients or unwanted disturbances.

SEE OR SEARCH THIS CLASS, SUBCLASS:

621, for noise reduction (e.g., error prevention) with digital storage.

SEE OR SEARCH CLASS

330, Amplifiers,

149, for noise, hum or distortion bucking introduced into signal channel.

381, Electrical Audio Signal Processing Systems and Devices,

71.1+, for acoustical noise or sound cancellation; subclasses 94.1+ for noise or distortion suppression.