Patents
Sitemap › H04 - Electric communication technique › H04B - Transmission › H04B 3 - Line transmission systems
Patents for H04B 3 - Line transmission systems (31,523)
01/1981
01/06/1981US4243959 Adaptive filter with tap coefficient leakage
01/06/1981US4243957 Universal equalizer
01/06/1981US4243956 Automatic equalizer for a synchronous digital transmission signal
12/1980
12/30/1980US4242650 Active variable equalizer
12/30/1980US4242542 Frogging signal repeater for a transmission line communications system
12/30/1980CA1092734A2 Recursive-like adaptive echo canceller
12/30/1980CA1092663A1 4-quadrant multiplier
12/30/1980CA1092653A1 Method and apparatus for measuring telephone line
12/24/1980WO1980002897A1 Adaptive filter with tap coefficient leakage
12/23/1980US4241428 Line compensated seismic amplifier
12/23/1980US4241320 Circuit arrangement for establishing weighting coefficients in an analog-type adaptive equalizer
12/23/1980US4241243 Power regulator for use with line signal repeaters which are remotely powered
12/16/1980US4239940 Carrier current communications system
12/16/1980CA1091833A2 Recursive-like adaptive echo canceller
12/11/1980WO1980002783A1 Automatic equalization for digital transmission systems
12/10/1980EP0020044A1 Equalizer arrangements
12/10/1980EP0019755A1 Method and circuit arrangement for cross-talk-suppression during data transmission over a two-wire line
12/09/1980US4238648 Termination for telecommunication path
12/02/1980US4237554 Coefficient tap leakage for fractionally-spaced equalizers
12/02/1980US4237463 Directional coupler
12/02/1980US4237417 Signal transmission apparatus of two-wire type
11/1980
11/27/1980WO1980002631A1 Data transmission arrangement
11/26/1980EP0019194A1 Digital telecommunication system with at least one four-wire line section
11/26/1980EP0019084A1 Circuitry for reducing amplitude-dependent distortions in heterodyne receivers
11/25/1980US4236116 Level control circuitry for two way communication system
11/18/1980CA1089935A1 Transceivers for single channel carrier telephone systems
11/11/1980US4233577 Flat transmission path for communication system
11/04/1980US4232400 Echo control system
11/04/1980US4232263 Measuring installation for frequency analysis of signal levels within a large amplitude range
11/04/1980CA1089005A1 Circuit for the protection of telephone lines
10/1980
10/29/1980EP0018334A1 Apparatus for transmitting information on an alternating current line
10/29/1980EP0017716A1 Method for initializing an adaptive equalizer starting from an unknown data signal in a transmission system using a double side band modulation with quadrature carriers
10/28/1980CA1088629A1 Phase-jump detector and corrector method and apparatus for phase-modulated communication systems that also provides a signal quality indication
10/21/1980US4229716 Amplitude equalizer circuit
10/21/1980US4229626 Loop fault sectionalization
10/21/1980US4229625 Repeater level control circuit
10/21/1980CA1088234A1 Test circuit for a protective coupler
10/14/1980US4228422 System for displaying at a remote station data generated at a central station and for powering the remote station from the central station
10/14/1980US4228409 Transmission arrangement having an adjustable network
10/14/1980CA1087693A1 Frequency domain automatic equalizer utilizing the discrete fourier transform
10/07/1980US4227181 Peripheral station in an information handling system
10/07/1980US4227160 Transversal type automatic equalizer
10/07/1980US4227152 Method and device for training an adaptive equalizer by means of an unknown data signal in a quadrature amplitude modulation transmission system
10/07/1980CA1087266A1 Method and apparatus for communication over electric power lines
10/07/1980CA1087258A1 Circuit for wire transmission of high frequency data communication pulse signals
10/07/1980CA1087251A1 Power control on satellite uplinks
10/01/1980EP0016503A1 Waveform correction circuit
10/01/1980EP0016472A1 Arrangement with a hybrid for the two-wire to four-wire transition in PCM-time division multiplexing systems
09/1980
09/30/1980US4225964 Detection means for providing multiple baud values per individual baud period of a carrier signal to obviate baud timing ambiguities
09/30/1980US4225834 Equalizing network having a plurality of frequency sensitive attenuation branches in a negative feedback arrangement
09/30/1980US4225832 Self-adapting equalizer
09/30/1980US4225754 Loudspeaker telephone
09/23/1980US4224483 Electronic loaded/nonloaded telephone loop identification circuit
09/17/1980EP0015363A1 Speech detector with a variable threshold level
09/09/1980US4222035 Multiplex system having digital coded power line signals
09/09/1980CA1085524A1 Four-wire integrable hybrid
09/04/1980WO1980001863A1 Coefficient tap leakage for fractionally-spaced equalizers
09/03/1980EP0014969A1 Input circuit for receiver-side line terminal apparatus of a telecommunication system
09/02/1980US4220931 Composite video automatic gain control amplifier
09/02/1980US4220914 AM-PM Conversion for measuring delay distortion
09/02/1980CA1085005A1 Continuous level measurement regulator
08/1980
08/26/1980US4219788 Active variable equalizer
08/26/1980CA1084642A1 Bidirectional voice frequency repeater
08/26/1980CA1084590A1 Selective intermodulation distortion measurement
08/20/1980EP0014604A1 Sampling filter
08/20/1980EP0014505A1 Device testing system provided with an echo suppressor
08/19/1980US4218655 Method and apparatus for transmitting intelligence over a carrier wave
08/19/1980CA1084127A1 Adaptive equalizer with improved distortion analysis
08/12/1980US4217562 Equalizer networks providing a bump shaped response
08/12/1980US4217554 Circuits for reducing intermodulation noise
08/12/1980CA1083689A1 Automatic remote meter reading and control system
08/12/1980CA1083679A1 Automatic cable equalizer circuit
08/07/1980WO1980001633A1 Modified vestigial side band transmission system
08/05/1980CA1083227A1 Method and apparatus for performing binary equalization in voice-band phase-modulation modems
08/05/1980CA1083221A1 Transmission system and repeater stations therefor
07/1980
07/29/1980US4215394 Control logic for an inverter ripple controlled power system
07/29/1980US4215252 Video teleconference audio echo control unit
07/29/1980CA1082827A1 Recursive-like adaptive echo canceller
07/23/1980EP0013343A1 Process and device to detect a pseudo-random sequence of 0 degree and 180 degree phase changes of the carrier in a data receiver
07/22/1980CA1082329A1 Power supply fo power line carrier communication systems
07/15/1980US4213014 Half echo-suppressor for a four-wire telephone line
07/15/1980CA1081851A2 Pseudo rms value circuit
07/15/1980CA1081815A1 Polyphase distribution network power line carrier communication system
07/09/1980EP0012977A1 Circuit for detecting and locating faults in a transmission system for pulse code modulated signals
07/09/1980EP0012884A1 Process and apparatus for detecting a pseudo-random sequence of two symbols in a data receiver using a double sideband modulation with quadrature carriers
07/08/1980CA1081380A1 Logarithmic echo canceller
07/08/1980CA1081329A1 Frequency domain automatic equalizer having logic circuitry
07/01/1980US4210901 Signal repeater for a distribution network communication system
07/01/1980CA1080807A1 Distortion adapter receiver having intersymbol interference correction
07/01/1980CA1080630A1 Noise filtering device
06/1980
06/26/1980WO1980001348A1 Synchronization of a data communication receiver with a received signal
06/25/1980EP0012515A1 Instrument for testing susceptibility of PCM regenerators to noise
06/25/1980EP0012247A1 Subscriber line circuit
06/25/1980EP0012238A1 Circuit arrangement for closing the remote-feeding loop for serially fed intermediate repeater stations
06/24/1980US4209666 Multiplexing system line fault isolation and identification
06/17/1980US4208640 Attenuation equalizer for correcting a temperature and frequency-dependent cable attenuation
06/17/1980US4208633 Current supply branching arrangement for separation of signal and supply currents
06/17/1980CA1079817A1 Data bus arrangement for josephson tunneling device logic interconnections
06/11/1980EP0011720A1 Circuitry for suppressing the influence of interfering voltages at the evaluation of the condition of a signal on transmission lines, particularly on subscriber lines in telephone installations
06/10/1980US4207624 Frequency domain adaptive filter for detection of sonar signals
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