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Class Information
Number: 375/285
Name: Pulse or digital communications > Systems using alternating or pulsating current > Antinoise or distortion
Description: 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.










Patents under this class:
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Patent Number Title Of Patent Date Issued
6667685 Power line noise filter Dec. 23, 2003
6668023 Linear block interleaver system and method Dec. 23, 2003
6658024 Data transmission device and data transmission method capable of minimizing delay of fast data both in normal conditions and noisy conditions Dec. 2, 2003
6650701 Apparatus and method for controlling an acoustic echo canceler Nov. 18, 2003
6647069 Method and apparatus for capacity increase and enhanced communications performance in CATV networks Nov. 11, 2003
6647070 Method and apparatus for combating impulse noise in digital communications channels Nov. 11, 2003
6647071 Method and apparatus for equalization and tracking of coded digital communications signals Nov. 11, 2003
6647074 Removal of clock related artifacts from an offset QAM generated VSB signal Nov. 11, 2003
6647078 Method and device for multi-user frequency-domain channel estimation based on gradient optimization techniques Nov. 11, 2003
6639937 Method and apparatus for producing spread-coded signals Oct. 28, 2003
6639948 Fractional delay digital filter Oct. 28, 2003
6639949 Method and apparatus for pulse overlap pre-compensation in digitally modulated signals Oct. 28, 2003
6625226 Variable bit rate coder, and associated method, for a communication station operable in a communication system Sep. 23, 2003
6621874 Method and radio station for data transmission Sep. 16, 2003
6614766 Interference canceller Sep. 2, 2003
6609011 Radio communication system, communication terminal apparatus, base station apparatus, and radio communication equalizing method Aug. 19, 2003
6603819 Radio symbol synchronization and doppler estimation techniques Aug. 5, 2003
6597746 System and method for peak to average power ratio reduction Jul. 22, 2003
6590932 Methods, receiver devices and systems for whitening a signal disturbance in a communication signal Jul. 8, 2003
6590945 Method and apparatus for frequency offset compensation Jul. 8, 2003
6587510 Control information transmitting method, transmitter, and transmitting and receiving apparatus Jul. 1, 2003
6583649 Signal transmission apparatus for setting delay amount based on operational speed Jun. 24, 2003
6584159 Mixed-mode next/echo canceller for pulse amplitude modulated (PAM) signals Jun. 24, 2003
6584160 System and method for reducing the effects of clipping in a DMT transceiver Jun. 24, 2003
6577675 Signal separation Jun. 10, 2003
6574285 128-ary signal constellations suitable for non-linear amplification Jun. 3, 2003
6563885 Decimated noise estimation and/or beamforming for wireless communications May. 13, 2003
6553063 Constellation-multiplexed transmitter and receiver Apr. 22, 2003
6549586 System and method for dual microphone signal noise reduction using spectral subtraction Apr. 15, 2003
6548978 Suppression circuit Apr. 15, 2003
6546057 Suppression of radio frequency interference and impulse noise in communications channels Apr. 8, 2003
6546058 Method and apparatus for reducing the average transmit power of a base station Apr. 8, 2003
6542560 Method of channel estimation and compensation based thereon Apr. 1, 2003
6538585 Distance-enhancing coding method Mar. 25, 2003
6529925 Method for reducing the crest factor of a signal Mar. 4, 2003
6519278 Transmitting/receiving apparatus using a plurality of spreading codes Feb. 11, 2003
6516023 System and method of downconversion where the received signal is downconverted Feb. 4, 2003
6516024 Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with low distortion and current limiting Feb. 4, 2003
6516028 Automatic delay equalizer and automatic delay equalization method as well as automatic delay and amplitude equalizer and automatic delay and amplitude equalization method Feb. 4, 2003
6510174 Apparatus, and associated method, for facilitating setting of link parameters to improve communication qualities in a radio communication system Jan. 21, 2003
6507620 Noise elimination method and transmission circuit Jan. 14, 2003
6507622 Communication systems, sender and receiver Jan. 14, 2003
6507623 Signal noise reduction by time-domain spectral subtraction Jan. 14, 2003
6507628 Distortion-compensated digital communications receiver and method therefor Jan. 14, 2003
6504864 Digital access arrangement circuitry and method for connecting to phone lines having a second order DC holding circuit Jan. 7, 2003
6504878 Digitally modulated RF amplifier system having improved adjacent sideband distortion reduction Jan. 7, 2003
6504884 Method for correcting DC offsets in a receiver Jan. 7, 2003
6501804 Method for the transmission of digital signals Dec. 31, 2002
6501805 Broadcast transmission system with single correction filter for correcting linear and non-linear distortion Dec. 31, 2002
6501806 Estimation of introduced frequency offset by a signal correction and transmission medium Dec. 31, 2002

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