Patents
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Patents for H04B 3 - Line transmission systems (31,523)
08/1989
08/24/1989DE3804332A1 Circuit arrangement for the transition from four-wire mode to two-wire mode in electrical communications systems
08/23/1989EP0329514A1 Connecting interface for an information transmission system, e.g. for an automotive vehicle
08/22/1989US4860280 Apparatus and method for a secure and diagnosable antijabber communication circuit
08/22/1989US4859951 Detecting faults in transmission lines employing an echo cancellation signal
08/22/1989CA1258700A1 Data transmission system
08/16/1989EP0327966A1 Transverse filter
08/16/1989CN2043028U Photo-electric isolating device for communication apparatus
08/15/1989US4858231 Bus interface loading assembly
08/15/1989US4858068 Electronic circuit housing
08/15/1989US4857884 Paging system
08/15/1989US4857716 Patient identification and verification system and method
08/15/1989US4856906 Enhanced system for transmission loss comparison
08/10/1989WO1989007370A1 Far end echo cancellation method and apparatus
08/08/1989US4855730 Component audio/video system with timed control of plural peripheral devices
08/08/1989CA1258301A1 Non-linear adaptive filters
08/02/1989CN2042261U Tandem device of facsimile machine in wire transmission
08/01/1989US4853950 Impedance measuring apparatus for R.F. baseband signals over two wire telephone lines
08/01/1989US4853802 Single stage feedforward equalizer
08/01/1989US4853651 Delay circuit with all-pass network
07/1989
07/27/1989WO1989005076A3 Apparatus and method for a secure and diagnosable antijabber communication circuit
07/26/1989EP0205563B1 System for selectively coupling a plurality of data stations into a single communications path
07/25/1989US4852161 Echo canceller using an echo path status detection
07/25/1989US4852082 Circuit arrangement for testing the operability of the data transmission facility
07/25/1989US4852081 Echo suppressor with adaptive digital filter for transmission system
07/25/1989US4852036 Adaptive digital filter and an echo canceler incorporating the same
07/25/1989CA1257914A1 Adaptive automatic equalizer
07/25/1989CA1257905A1 Vital safety monitoring circuit
07/19/1989EP0324029A1 Adaptive noise cancellation in a closed loop control system
07/19/1989EP0324012A1 Shorted-coaxial-cable detector for local-area networks.
07/18/1989US4849981 High frequency signal driver for a laser diode and method of forming same
07/12/1989EP0323870A2 Signal equalising arrangement and method, using a feedback equaliser
07/11/1989US4847903 Wireless remote speaker system
07/11/1989US4847885 System for measuring and automatically compensating for the distorsions of a connection between a telephone apparatus and a central voice processing unit
07/11/1989US4847864 Phase jitter compensation arrangement using an adaptive IIR filter
07/11/1989US4847797 For reception of electrical signals
07/11/1989US4847782 Energy management system with responder unit having an override
07/11/1989US4847781 Energy management system
07/11/1989CA1257354A1 Power line communications terminal and interface circuit associated therewith
07/11/1989CA1257352A1 Method and apparatus for adjusting a digital equalizing filter in simultaneous adaptive echo elimination and adaptice elimination of noise caused by intersymbol interference
07/06/1989DE3744130A1 Circuit arrangement for reducing longitudinal voltages on two-wire lines
07/05/1989EP0323072A2 Data transmission with improved message format
07/05/1989EP0322803A2 Automatic gain control amplifier for compensating cable loss
07/04/1989US4845746 Echo canceller with relative feedback control
07/04/1989US4845735 Non-interfering method for measuring propagation delay of telecommunications network and apparatus for accomplishing same
07/04/1989US4845466 System for high speed digital transmission in repetitive noise environment
07/04/1989CA1256955A1 Passband equalization of modulated quadrature-related carrier signals
06/1989
06/28/1989EP0322060A2 Adjusting filter coefficients
06/28/1989CN1004677B Two wires communication system
06/28/1989CN1004676B Apparatus for three-phase power line carrier communications
06/27/1989US4843345 Output stage with automatic level control for power line signalling
06/27/1989CA1256527A1 Method of cancelling echoes in full-duplex data transmission system
06/27/1989CA1256526A1 Adaptive hybrid circuits for crosstalk cancellation
06/21/1989EP0321153A2 Cancelling circuit and transmission system
06/21/1989EP0320637A2 Method and apparatus for correcting phase in an echo canceller system
06/21/1989EP0282577A4 Energy management system.
06/21/1989CN1004603B Unmanned computerized communication system
06/20/1989US4841281 Apparatus for controlling a switching amplifier
06/20/1989US4841103 Arrangement for the connection of an intermediate repeater for submarine cables
06/15/1989DE3740652A1 Device for improving the side tone suppression or loop gain in intercom systems
06/13/1989CA1255756A1 Methods of communicating over metallic conductors having multiple grounds
06/07/1989CN2039088U Alarm for broadcasting line transmission break
06/07/1989CN2039087U Power amplifier for megaphone
06/06/1989US4837812 Dual connection mode equipped communication control apparatus
06/06/1989US4837780 Transmit line buildout circuits
06/01/1989WO1989005076A2 Apparatus and method for a secure and diagnosable antijabber communication circuit
06/01/1989WO1989005068A1 Process for adaptive compensation of echoes in a communication system
05/1989
05/31/1989EP0318274A2 Method and apparatus for detecting and discriminating faults in transmission circuits
05/31/1989EP0318105A1 Analog circuit for baseband modem
05/31/1989EP0317610A1 Wireless remote speaker system
05/31/1989EP0187778B1 Adaptive hybrid circuit
05/30/1989US4835765 Arrangement for full-duplex data transmission over two-wire circuits
05/30/1989US4835517 Modem for pseudo noise communication on A.C. lines
05/30/1989US4835516 Arrangement for introducing audio-frequency signals into a power supply line
05/30/1989US4835494 Automatic level control system for broadband cable systems
05/30/1989US4835483 QAM demodulator with rapid resynchronization function
05/30/1989US4835394 Cable assembly for an electrical signal transmission system
05/30/1989US4835372 Patient care system
05/24/1989EP0316536A2 Terminal unit in information transmission system
05/23/1989US4833694 Signal receiver
05/23/1989US4833691 Line equalizer
05/23/1989CA1254605A1 Monitoring system for use with elongate heater units
05/18/1989WO1989004567A1 Broadband local area network
05/18/1989DE3737731A1 Circuit for levelling the amplitude frequency response of filters
05/16/1989US4831651 Intermediate amplifier for use in two-wire connections of a dial telephone network and method for the gain control of said amplifier
05/16/1989US4831375 Two-wire communication apparatus
05/16/1989CA1254278A1 Method and apparatus for improved control and time sharing of an echo canceller
05/10/1989EP0315191A1 Echo canceller
05/09/1989US4829570 Wireless remote speaker system
05/03/1989EP0314375A2 Telecommunications wiring test apparatus and method
05/03/1989EP0314360A2 Pulse conditioning circuit
05/03/1989EP0314300A2 Remote connection of a termination network
05/03/1989EP0314237A1 Negative immittance converter
05/03/1989EP0313706A1 Analog-to-digital and digital-to-analog conversion system and echo cancellation device including the same
05/03/1989CN2037125U Auto-control switch for broadcasting audio-frequency signal of loud speaker
05/02/1989US4827472 Echo canceller using delta modulation
04/1989
04/25/1989US4825459 Local loop test arrangement in an echo canceller based full duplex modem
04/20/1989WO1989003623A1 Decoupling network and communication system
04/19/1989EP0311972A2 Auto-threshold / adaptive equalizer
04/18/1989US4823382 Echo canceller with dynamically positioned adaptive filter taps
04/18/1989US4823339 Method and device for protecting modems against echoes
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