US PATENT SUBCLASS 327 / 311
.~.~.~.~ By filtering

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  DF  .~.~.~ Transient or signal noise reduction {4}
311.~.~.~.~ By filtering

DEFINITION

Classification: 327/311

By filtering:

(under subclass 310) Subject matter wherein the limiting, clipping or clamping of a signal transient is provided by a

circuit which offers little opposition to some frequencies or DC while blocking or attenuating other frequencies.

SEE OR SEARCH THIS CLASS, SUBCLASS:

329, for tuned circuit limiters.

552+, for miscellaneous active filters which suppress an unwanted signal.

SEE OR SEARCH CLASS

307, Electrical Transmission or Interconnection Systems,

105, for harmonic filters and neutralizers other than nonlinear active device types. 333, Wave Transmission Lines and Networks,

17.1+, through 20 for filters (usually passive) for controlling amplitude, impedance matching, and wave shaping; subclasses 24+ for passive wave filters; and subclasses 213+ for active devices determining passive filter characteristics.

375, Pulse or Digital Communications,

103, for filtering in receivers.

455, Telecommunications,

296+, and 339 for noise or interference elimination and for filter coupling or decoupling of stages in receiver or analog modulated signal frequency converter systems.

708, Electrical Computers: Arithmetic Processing and Calculating,

300+, for digital filters and subclass 819 for filtering by an analog computer.