(under subclass 259) Subject matter with provision for correction or reduction of distortion of the wave shape of the carrier wave or for the correction or reduction of the effects of extraneous pulses.
SEE OR SEARCH THIS CLASS, SUBCLASS:
267, for pulse modulated carrier wave systems with diversity.
278, for frequency shift keyed systems with antinoise or antidistortion.
284, for phase shift keyed systems with antinoise or antidistortion.
313, for transmitters with key click prevention.
346, for receivers with interference or noise reduction.
SEE OR SEARCH CLASS 333, Wave Transmission Lines and Networks,
28, for passive equalizers; and subclasses 165 through 212 for filters, per se.
455, Telecommunications,
63+, for noise reduction systems; and subclasses 296+ for noise reducing receivers.
708, Electrical Computers: Arithmetic Processing and Calculating,
300+, and 819 for filters and equalizers which perform mathematical functions during operation.
