Patents
Sitemap › H04 - Electric communication technique › H04B - Transmission › H04B 3 - Line transmission systems
Patents for H04B 3 - Line transmission systems (31,523)
11/1993
11/30/1993US5267071 Signal level control circuitry for a fiber communications system
11/30/1993US5267041 Ghost cancelling circuit
11/25/1993WO1993023928A1 Power line coupler modem device for communication over electrical lines
11/25/1993DE4220410C1 Verfahren zum Bestimmen eines Fehlers auf einer elektrischen Übertragungsleitung A method for determining a fault on an electric transmission line
11/25/1993DE4217066A1 Electric terminal appts. coupler to information bus - has bus coupling part and bus terminal part in part-housing
11/24/1993EP0344169B1 Transmission system
11/24/1993CN2147694Y Wire electronic interspeaking device
11/24/1993CN2147693Y Language sound quick transmitting device
11/23/1993US5265124 Integrated multi-port repeater having shared resources
11/23/1993US5265123 Expandable repeater
11/23/1993US5264823 Power line communication system
11/18/1993EP0569364A1 Bus coupler.
11/16/1993US5263052 Viterbi equalizer for radio receiver
11/16/1993US5263027 Multiplex transmitter-receiver system
11/16/1993US5263026 Maximum likelihood sequence estimation based equalization within a mobile digital cellular receiver
11/16/1993US5263020 Echo canceller
11/16/1993US5263019 Method and apparatus for estimating the level of acoustic feedback between a loudspeaker and microphone
11/16/1993US5262771 Method for addressing processor units
11/16/1993US5262755 Inbound communications using electricity distribution network
11/10/1993EP0569216A1 Microphone apparatus
11/03/1993EP0568429A1 Regenerator for digital framed signals, useful in particular in digital transmission equipment for radio waves
10/1993
10/29/1993CA2094994A1 Frame digital signal regenerator, particularly for a microwave digital communications installation
10/28/1993WO1993022844A1 A method for eliminating accoustic echo in a communication device
10/28/1993WO1993021710A1 Coordinated coding for digital transmission
10/28/1993WO1993021696A1 Electrical network for emulating a transmission line
10/28/1993WO1993021695A1 A method for avoiding self-oscillation in conjunction with echo cancellation
10/28/1993CA2131890A1 A method for avoiding self-oscillation in conjunction with echo cancellation
10/28/1993CA2111225A1 Electrical network for emulating a transmission line
10/27/1993EP0567211A2 Adaptive receiver for multipath fading channels
10/27/1993EP0343189B1 Tdma communications system with adaptive equalization
10/26/1993US5257290 Transmission line termination of guide-communications wire for guided vehicles
10/26/1993US5257286 High frequency receive equalizer
10/26/1993US5257219 Spectrum equalization arrangement
10/26/1993US5257006 Method and apparatus for power line communications
10/21/1993DE4214125C1 Signal level and frequency monitoring for telephone call tone circuit - feeding frequency information for call tone input signal to microprocessor via DC voltage converter providing galvanic separation
10/20/1993EP0566362A2 Adaptive signal equaliser
10/20/1993EP0565687A1 An arrangement for the control of an echo canceller.
10/20/1993EP0565686A1 A method of preventing a divergence of an adaptive echo canceller in a noisy signal environment
10/20/1993EP0565682A1 A method for non-linear signal processing in an echo canceller.
10/20/1993EP0565672A1 A method for the detection of a disable tone signal of an echo canceller
10/20/1993EP0565671A1 A method of converging an echo canceller
10/20/1993EP0565526A1 Adaptive acoustic echo canceller
10/20/1993EP0216941B1 Apparatus for analysing two-channel transmission/reflection characteristics
10/20/1993CN2144375Y Apparatus for providing two-channel voices in carrier communication frequency band
10/20/1993CN1022531C Optical fiber telecommunication line comprising amplifiers of transmitted signals and amplifiers for said line
10/19/1993US5255317 ISND (Integrated Services Digital Network) and POTS (Plain Old Telephone
10/19/1993US5255267 Apparatus for combining broadband and baseband signal transmissions
10/19/1993US5254877 Distributed power supply system
10/19/1993CA1323402C Method and apparatus for decoding a quadrature modulated signal
10/14/1993WO1992017938A3 Differential driver/receiver circuit
10/13/1993EP0565326A2 Electrical fault detector
10/13/1993EP0565104A2 Interference canceller with feedforward transversal filter having switched tap-gain coefficients
10/13/1993EP0565034A2 Distributed power supply system
10/13/1993CN1077323A Video signal equalizer
10/13/1993CN1022450C Line breakdown detecting instrument
10/12/1993US5252961 System for monitoring status of plurality of repeaters
10/12/1993US5252932 Waveform equalizing filter unit
10/10/1993CA2089958A1 Distributed power supply system
10/08/1993CA2093473A1 Electrical fault detector
10/06/1993EP0563373A1 Directive separator/coupler circuit for medium frequency carrier currents on a low voltage electric line.
10/06/1993CN1077066A Transmitting method and system for low power single-phase audio signals
10/05/1993US5251328 Predistortion technique for communications systems
10/05/1993US5251237 Receiver for a digital transmission system
10/05/1993US5251033 D.C. responsive equalization for television transmission channel irregularities
10/05/1993US5251001 Reflected optical power fiber test system
10/05/1993CA2001483C Microwave group propagation time correction device
09/1993
09/30/1993WO1993019500A1 Low cross talk electrical connector system
09/30/1993WO1993019418A1 Method and apparatus for reduced-complexity viterbi-type sequence detectors
09/30/1993DE4306638A1 Spatial noise reducing device for vehicle passenger compartment - generates and updates compensating noise to interfere with transmitted periodic spatial noise
09/30/1993DE4202677C1 Periodic signal appts. for signal transmission paths - tests quality by injecting digital square wave signal for evaluation by shift register and comparator together with reference
09/29/1993CN2143031Y Frequency-modulating power line carrier
09/28/1993US5249224 Methods and apparatus for providing reciprocal impedance conversion
09/28/1993US5249179 Echo canceller system suitable for a 2B1Q transmission code
09/23/1993DE4308923A1 Active noise reduction system for vehicle passenger compartment - uses control noise sources for adaptive noise cancellation under control of detected residual noise level
09/22/1993EP0561556A1 Video signal equalizer
09/22/1993EP0561133A1 Multi-channel echo cancellation with adaptive filters having selectable coefficient vectors
09/22/1993EP0560945A1 Adaptive decision feedback equalizer apparatus for processing information stored on digital storage media
09/21/1993US5247541 Automatic equalizer for a data transmission channel
09/21/1993US5247512 Echo canceller
09/21/1993US5247401 Replay equalization circuit in digital image recorder
09/21/1993CA2021232C Diversity receiving system for use in digital radio communication with means for selecting branch by estimating propagation path property
09/16/1993WO1993018609A1 Circuitry for superimposing small, low energy signals and large, essentially higher energy signals
09/16/1993WO1993018594A1 A monitoring phone system
09/16/1993CA2131905A1 A monitoring phone system
09/15/1993EP0560498A2 Apparatus for combining broadband and baseband signal transmissions
09/15/1993EP0560237A2 Method for the synchronisation of base radio stations in a radio telephone system
09/15/1993EP0560236A2 Method and switching-arrangement for transmission of digital signals on subscriber-lines
09/15/1993EP0560071A2 Method of signalling
09/15/1993CN1022157C Interconnecting and processing system for facilitating frequency hopping
09/14/1993US5245633 System for transmitting digital data over an electricity power line
09/14/1993US5245556 Adaptive equalizer method and apparatus
09/14/1993US5245335 Transceiver system for communication over wire laid along the path of guided/vehicles
09/14/1993CA1322237C Transceiver arrangement for full-duplex data transmission comprising an echo canceller and provisions for testing the arrangement
09/08/1993EP0559351A1 Systems for measuring the propagation delay of a two-way communications network
09/08/1993CN1076067A Near-end communications line characteristic measuring systems
09/07/1993US5243624 Method and apparatus for updating coefficients in a complex adaptive equalizer
09/07/1993US5243337 Process and device for optimizing signal transmission rates on multifunctional well cables
09/04/1993CA2062192A1 Multiple device control system
09/02/1993WO1993017510A1 Feedback level estimator between loudspeaker and microphone
09/02/1993WO1993017348A1 Process for detecting non-linear behaviour in a digital data transmission path to be examined
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