US PATENT SUBCLASS 84 / 621-- .~.~.~.~ Noise reduction (e.g., error prevention)

US PATENT SUBCLASS 84 / 621
.~.~.~.~ 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}
601	DF	.~.~ Data storage {6}
602	DF	.~.~.~ Digital memory circuit (e.g., RAM, ROM, etc.) {9}
621		.~.~.~.~ Noise reduction (e.g., error prevention)

DEFINITION

Classification: 84/621

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

(under subclass 602) Subject matter wherein circuitry is provided to reduce electrical noises, transients or unwanted disturbances.

SEE OR SEARCH CLASS

381, Electrical Audio Signal Processing Systems and Devices,

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

702, Data Processing: Measuring, Calibrating, or Testing,

191+, for noise removal or suppression, in a measured signal of a data processing measuring system