US PATENT SUBCLASS 455 / 501
.~.~ Noise, distortion, or singing reduction

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

39  DF  TRANSMITTER AND RECEIVER AT SEPARATE STATIONS {14}
500  DF  .~ Plural transmitters or receivers (i.e., more than two stations) {4}
501.~.~ Noise, distortion, or singing reduction {2}
502  DF  .~.~.~> Synchronized stations {1}
504  DF  .~.~.~> Fading compensation {2}

DEFINITION

Classification: 455/501

Noise, distortion, or singing reduction:

(under subclass 500) Subject matter wherein any undesired electrical disturbance within the useful frequency band arising from sources internal or external to the system (e.g., crosstalk, power induction, atmospheric noise, etc.); or any undesired self-sustained oscillation existing in the system; or other unwanted signal tending to interfere with the operation of the system is reduced or prevented entirely.

SEE OR SEARCH THIS CLASS, SUBCLASS:

8, for failure compensation in repeaters.

SEE OR SEARCH CLASS

375, Pulse or Digital Communications,

272+, for similar subject matter in a frequency shift keying system, subclasses 279+ for similar subject matter in a phase shift keyed system, subclass 285 for similar subject matter in a pulse modulated carrier wave system in general, subclass 313 for a key click prevention in a pulse modulated carrier wave keying circuit, and subclasses 346+ for similar subject matter in a pulse modulated carrier wave receiver.

379, Telephonic Communications, 338+, for a telephone repeater with echo suppressing or anti-singing circuits.