US PATENT SUBCLASS 348 / 607
.~ Noise or undesired signal reduction

Current as of: June, 1999
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348 /   HD   TELEVISION

571  DF  IMAGE SIGNAL PROCESSING CIRCUITRY SPECIFIC TO TELEVISION {34}
607.~ Noise or undesired signal reduction {6}
608  DF  .~.~> Processing at encoder or transmitter (e.g., pre-correction) {4}
614  DF  .~.~> Ghost elimination (e.g., multipath)
615  DF  .~.~> Blackspot or shading correction (e.g., corrects for fixed pattern defects)
616  DF  .~.~> Dropout compensator (e.g., replacement type) {1}
618  DF  .~.~> For removal of low amplitude random noise (e.g., variable bandwidth) {3}
624  DF  .~.~> For color television

DEFINITION

Classification: 348/607

Noise or undesired signal reduction:

(under subclass 571) Subject matter including specific circuitry for the elimination of unwanted signals generated in the system, or by the transmission medium.

SEE OR SEARCH CLASS

326, Electronic Digital Logic Circuitry,

22+, for a logic circuit having input noise margin enhancement.

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,

165+, for rectangular waveform regeneration; subclass 317 for distortion compensation in limiting, clipping, or clamping; subclasses 379+ for gating circuit spurious noise override; and subclasses 551+ for miscellaneous unwanted signal suppression.

330, Amplifiers,

149, for hum or noise bucking. 455, Telecommunications,

63, 233.1, 296, and 501 for noise elimination in various type systems.