Patents
Sitemap › H04 - Electric communication technique › H04B - Transmission › H04B 3 - Line transmission systems
Patents for H04B 3 - Line transmission systems (31,523)
06/1980
06/03/1980CA1078922A1 Transformer cascade for powering electronics on high voltage transmission lines
05/1980
05/27/1980US4205269 Remote control variable attenuation device for an antenna amplifier
05/27/1980US4205202 Method and means for improving the spectrum utilization of multichannel telephone systems
05/27/1980CA1078536A1 Bilateral voice-signal controller for use in the two-wire portion of the telephone circuit
05/27/1980CA1078460A1 Transmission system between two terminal stations through a transmission line including low-frequency cross-talk supression circuits
05/27/1980CA1078458A1 Compensation indicator for attenuation probe
05/20/1980US4204176 Variable equalizer
05/15/1980WO1980001026A1 Regenerator having automatic gain control referenced to a data-pattern-dependent pulse stream
05/15/1980WO1980001024A1 Process for transferring information and system for carrying out the process
05/13/1980US4203010 Communication system
05/06/1980US4202024 Repeater bypass protection apparatus
05/06/1980US4201959 Automatic equalization system
04/1980
04/29/1980US4200862 Appliance control
04/22/1980US4199729 Variable peak detector
04/22/1980US4199668 Circuit arrangement for signal equalization in wide-band transmission system
04/22/1980CA1076262A1 Method and apparatus for determining the initial values of the coefficients of a complex transversal equalizer
04/22/1980CA1076229A1 Two-wire transmitter with totalizing counter
04/22/1980CA1076211A1 Receiver selecting (voting) system
04/17/1980WO1980000770A1 Driving point impedance
04/17/1980WO1980000769A1 Frequency-sensitive electronic hybrid
04/16/1980EP0009811A1 Line amplifier with a circuit for the coarse protection of input and output against overvoltage
04/16/1980EP0009592A1 Method and circuit for testing a communication station
04/16/1980EP0009591A1 Circuit for a speech-controlled loudspeaking telephone station in telecommunication systems, especially telephone systems
04/15/1980US4198600 Demodulating system for auxiliary channel in straight-through radio frequency repeater
04/15/1980CA1075779A1 Frequency response equalizer with adjustable compensation circuit
04/08/1980US4197514 Microwave delay equalizer comprising a pair of distributed-constant_ elements as a directional coupler
04/08/1980US4197428 Segmented matrix type switching device with simplified control
04/01/1980US4196320 Method and means for powering telephone span lines
04/01/1980CA1074893A1 Switching network with crosstalk elimination capability
03/1980
03/25/1980CA1074473A2 Impedance simulating repeater for transmission lines
03/19/1980EP0008913A1 Variable level converter
03/18/1980US4194178 Electric motor with internal wireless load monitor
03/18/1980US4194128 Ripple control systems
03/18/1980US4194092 Device for detecting a frequency in a PCM coded signal
03/18/1980CA1074019A1 Loop fault location and isolation
03/11/1980US4193129 Charging circuit for sonar systems
03/11/1980US4192979 Apparatus for controlling echo in communication systems utilizing a voice-activated switch
03/11/1980US4192974 Multi-section apparatus for improving signal transmission through telephone transmission lines
03/05/1980WO1981000655A1 Wire data transmission system
03/04/1980CA1073139A2 Repeater for transmission lines of differing lengths
03/04/1980CA1073138A2 Circuit for generating control signal indicative of transmission line resistance
03/04/1980CA1073137A1 Negative impedance repeater for telephone line
03/04/1980CA1073136A1 Digital echo attenuator for telephone system
03/04/1980CA1073062A1 Equalizer circuit
03/04/1980CA1073053A1 Repeater monitoring and fault location
02/1980
02/26/1980CA1072641A1 Noise suppression device
02/19/1980CA1072190A1 Filtering device for high voltage lines used for teletransmissions
02/12/1980US4188619 Transformer arrangement for coupling a communication signal to a three-phase power line
02/12/1980CA1071779A1 Multi-channel multiplex data transmission system
02/12/1980CA1071721A1 Universal equalizer
02/06/1980EP0007628A1 Circuit for the remote feeding of intermediate stations in a telecommunication arrangement
02/06/1980EP0007626A1 Circuit for remotely powering intermediary stations in an arrangement related to the information transmission technology
02/05/1980US4187479 Variable equalizer
02/05/1980US4186873 Humidity control system and circuitry
01/1980
01/29/1980US4186282 Method and apparatus for measuring telephone line characteristics
01/29/1980CA1070824A1 Apparatus for transmitting high frequency signals
01/29/1980CA1070778A1 Discrete transversal filter
01/29/1980CA1070767A1 Synchronous power communicating
01/22/1980US4185248 Input level supervisory system for level regulator
01/22/1980CA1070390A1 Method and apparatus for transmitting intelligence over a carrier wave
01/22/1980CA1070246A1 Signal repeater for power distribution line communication systems
01/15/1980CA1069978A1 Rf leak detector
01/09/1980EP0006244A1 Telecommunication system
01/09/1980EP0006194A1 Circuit arrangement for the ungrounded transmission of signals across points of isolation in communication systems
01/09/1980EP0006182A1 Circuit arrangement for the ungrounded transmission of signals across points of isolation in telecommunication installations
01/09/1980EP0006121A1 Method and arrangement for initiating an adaptive equalizer starting from an unknown data signal in a transmission system utilizing quadrature amplitude modulation
01/08/1980US4182936 Transformerless trunk circuit
01/01/1980US4181970 Digital attenuator for compressed PCM signals
01/01/1980US4181824 Balancing impedance circuit
12/1979
12/25/1979US4180804 Remote control device for an amplifier trap circuit
12/25/1979US4180705 Arrangement for the automatic resynchronization of a data transmission receiver
12/18/1979US4179624 Carrier control method by using phase-pulse signals
12/12/1979EP0005759A1 Echo suppressor
12/11/1979US4178579 Remote instrumentation apparatus
12/11/1979US4178569 Hybrid for two-wire full-duplex transmission of digital signals
12/11/1979CA1067828A1 Audio system with enhanced spatial effect
12/04/1979US4177361 Signaling tone transparent echo suppressor
11/1979
11/27/1979US4176320 Transmission trunk powering system
11/27/1979US4176317 Circuit arrangement for determining the frequency dependent amplitude fluctuation characteristic of a communications transmission link
11/20/1979US4175218 Telephone switching system
11/20/1979US4175213 Regenerator having automatic gain control referenced to a data-pattern-dependent pulse stream
11/20/1979CA1066826A2 Automatic h-register clear for prevention of erroneous convolution in digital adaptive echo canceller
11/20/1979CA1066824A1 Digital voice signaling with digital echo detection and voice activity compression used to cancel echo
11/20/1979CA1066791A1 Remote accessing system for telephone lines
11/13/1979US4174517 Central system for controlling remote devices over power lines
11/13/1979US4174470 Electronic hybrid
11/06/1979US4173714 Communication circuit with combined power feed and data transmission over a phantom channel
10/1979
10/31/1979EP0004972A1 Method and apparatus for transmission path measurement in electrical information transmission systems
10/30/1979CA1065514A1 Automatic h-register clear for prevention of erroneous convolution in digital adaptive echo canceller
10/30/1979CA1065510A1 Digital type level regulator
10/30/1979CA1065259A1 Remote control power supply for cable transmission line with repeaters suubmitted to external electric fields
10/30/1979CA1065258A1 Remote control power supply for cable transmission line with repeaters submitted to external electric fields
10/23/1979US4172215 Transformer coupling circuit providing for cancellation of D.C. fluxes
10/23/1979CA1065015A1 Instruments and methods for measuring characteristics of only a selected portion of a transmission channel
10/16/1979CA1064631A1 Foreign potential checker
10/16/1979CA1064586A1 Line equalizer with differentially controlled complementary constant resistance networks
10/09/1979US4170761 Remotely powered intermediate amplifier for communications transmission
10/09/1979US4170722 Apparatus and method for remote testing of a loop transmission path
10/09/1979US4170715 Data communication system
10/02/1979CA1063744A1 Echo canceller for two-wire pull duplex data transmission
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