US PATENT SUBCLASS 327 / 310
.~.~.~ Transient or signal noise reduction

Current as of: June, 1999
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327 /   HD   MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS

100  DF  SIGNAL CONVERTING, SHAPING, OR GENERATING {29}
306  DF  .~ Amplitude control {5}
309  DF  .~.~ By limiting, clipping, or clamping {10}
310.~.~.~ Transient or signal noise reduction {4}
311  DF  .~.~.~.~> By filtering
312  DF  .~.~.~.~> By feedback limiting-clamping
313  DF  .~.~.~.~> Using 3 or more terminal type nonlinear devices only
314  DF  .~.~.~.~> Using diode type nonlinear devices only

DEFINITION

Classification: 327/310

Transient or signal noise reduction:

(under subclass 309) Subject matter wherein the limiting, clipping, or clamping lessens or eliminates an intermittent spuriously generated component from a signal.

(1) Note. Recited noise override of the type associated with gating or switching is classified with the gating or

switching area below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

379+, for gating circuits having improvement of signal transmission integrity or spurious noise override.

551+, for miscellaneous unwanted signal suppression.

SEE OR SEARCH CLASS

326, Electronic Digital Logic Circuitry, 21+, for signal sensitivity enhancement or signal transmission integrity in digital logic.

361, Electricity: Electrical Systems and Devices,

110, and 111 for transient protection in systems or devices.

375, Pulse or Digital Communications,

34, 51, 57, 58, 60, and 99+ for noise reduction in pulse code modulated systems, systems using pulsating current, pulse transmitters, AC or pulse systems or receivers.

381, Electrical Audio Signal Processing Systems and Devices,

13, 83, 93, and 94.1+ for noise or feedback suppression in audio systems.

455, Telecommunications,

63+, 114, 218+, 278+, 283+, 296+, and 501+ for noise or interference elimination in analog communication systems (e.g., transmitter and receiver at separate stations or transceivers, etc.).

704, Data Processing: Speech Signal Processing, Linguistics, Language Translation, and Audio Compression/Decompression,

233, for detection of speech in noise.

714, Error Detection/Correction and Fault Detection/Recovery, 761, 763 +, 781 and 788 for correcting digital data errors caused by random or burst noise signals.