Patents
Sitemap › H04 - Electric communication technique › H04B - Transmission › H04B 3 - Line transmission systems
Patents for H04B 3 - Line transmission systems (31,523)
03/1982
03/16/1982CA1120165A1 Echo canceller with logarithmic encoding
03/16/1982CA1120122A1 Ice sensor for power lines
03/10/1982EP0046804A1 Message communication system
03/10/1982EP0046791A1 Tranciever for phase-shift modulated signals
03/09/1982US4319288 Current injection tapped delay line spectral shaping equalizer and differentiator
03/09/1982US4319224 Powerline carrier control system with powerline current compensation
03/09/1982CA1119685A1 Arrangement for monitoring the performance of a digital transmission system
03/09/1982CA1119678A1 Wide-band transistorized amplifier
02/1982
02/23/1982US4317219 Mobile radio system
02/23/1982US4317216 Bi-directional filter system for amplifying signals in separate frequency bands
02/23/1982US4317010 Remote monitoring system for remote locating and gain regulating of amplification circuits in data transmission line
02/23/1982CA1118924A1 Method and device for digital echo cancellation
02/23/1982CA1118923A1 Telephone set with loudspeaker
02/23/1982CA1118879A1 Modular termination system for communication lines
02/16/1982CA1118511A1 Control logic for an inverter ripple controlled power system
02/09/1982US4315319 Non-linear signal processor
02/09/1982US4315251 Automatic meter reading and control system
02/09/1982US4315106 Apparatus for regulating current supplied to a telephone line signal of the type employed in digital telephone systems
02/09/1982US4315103 Speech-controlled loudspeaker telephone station circuit
02/02/1982US4314372 Methods and means for producing and reproducing transmitted or recorded sound or video signals
02/02/1982US4314288 Amplitude and phase equalizer
02/02/1982US4314106 Line circuit
01/1982
01/27/1982EP0044598A1 Cancelling arrangement for a composite echo signal
01/26/1982CA1117233A1 Multi-section apparatus for improving signal transmission through telephone transmission lines
01/26/1982CA1117232A2 Telephone line circuit
01/21/1982WO1982000230A1 Arrangement for adjusting an adaptive digital balance filter included in a subscriber unit
01/19/1982US4311964 Coherent phase shift keyed demodulator for power line communication systems
01/12/1982CA1116282A1 Matrix type switching device
01/12/1982CA1116258A1 Arrangement for the automatic resynchronization of a data transmission receiver
01/06/1982EP0043065A1 Transmission-line signal coupler
01/05/1982US4309770 Method and device for training an adaptive equalizer by means of an unknown data signal in a transmission system using double sideband-quadrature carrier modulation
01/05/1982US4309678 Sampling filter
01/05/1982US4309577 Circuit for closing the remote feed loop of a series-supplied repeater
12/1981
12/24/1981WO1981003728A1 Subscriber line audio processing circuit apparatus
12/23/1981EP0042014A1 Overvoltage protection circuit for line amplifiers
12/22/1981US4307380 Transmitting signals over alternating current power networks
12/22/1981US4307267 Testing loaded transmission lines
12/22/1981CA1114919A1 Two wire current transmitter with adjustable current control linearization
12/22/1981CA1114906A1 Undesired signal canceller
12/15/1981US4306306 Amplitude tilt and notch compensation apparatus
12/15/1981US4306146 High impedance transducer circuit
12/10/1981WO1981003559A1 Voiceband data set
12/08/1981US4304963 Communications system for remote monitoring
12/02/1981EP0040801A1 Automatic equalizer
12/02/1981EP0040785A1 Transformerless hybrid circuit
12/02/1981EP0040660A1 Equalizing apparatus for data transmission lines
12/01/1981US4303896 Wide range data cable equalizer
12/01/1981US4303895 Automatic equalizer
12/01/1981US4303808 Locating noise in communications systems
11/1981
11/25/1981EP0040217A1 Apparatus for and method of processing data signals.
11/24/1981US4302844 Carrier transmission through harmonic polluted medium
11/24/1981US4302843 Method and apparatus for measuring transmission characteristics of a test object during communication gaps
11/18/1981EP0040127A1 Signal transmission device comprising a precorrection circuit for non-linear products
11/18/1981EP0039980A1 Adaptive digital data receiving system with compensation of the amplitude and phase distortions introduced by the data transmission channel
11/18/1981EP0039979A1 Adaptive digital data receiving system with compensation of the amplitude and phase distortions introduced by the data transmission channel
11/10/1981US4300233 Noise assessment of PCM regenerators
11/10/1981US4300126 Method and apparatus, for power line communications using zero crossing load interruption
11/10/1981CA1112385A1 Compensation of transmission losses in a telephone system
11/10/1981CA1112383A1 Echo cancellation in two-wire two-way data transmission systems
11/10/1981CA1112382A1 Communication circuit
11/10/1981CA1112327A1 Peripheral station in an information handling system
11/04/1981EP0038877A1 Process and system for transmitting information and instructions on an alternating current distribution network
10/1981
10/28/1981EP0038400A1 Method and system for monitoring cables for the automatic monitoring of a communication cable network
10/27/1981US4297595 Signal regenerating circuit with improved input-output isolation
10/27/1981US4297536 Self-adjusting hybrid network
10/27/1981US4297531 Circuit for suppressing noise influences in the evaluation of signal states on transmission lines
10/27/1981CA1111588A1 Frequency recognizing device for pcm telephone systems
10/27/1981CA1111562A1 Method and device for measuring the slope of the envelope delay characteristic of a transmission channel and their application to the automatic equalizer selection technique
10/15/1981WO1981002960A1 Control unit for automatic meter reading system
10/15/1981WO1981002958A1 Terminal unit for automatic meter reading system
10/14/1981EP0037575A1 Circuit with a laser diode for transmitting information signals over an optical fibre
10/14/1981EP0037502A1 Sensor system
10/06/1981US4293952 Sampling function type equalizer
10/06/1981US4293947 Information handling system
10/06/1981US4293846 Remote selective switching system for use with AC power line
09/1981
09/30/1981EP0036696A1 Echo canceller for an echo signal with a variable phase
09/23/1981EP0036115A2 Audiofrequency ripple control installation with watching current device
09/23/1981EP0035992A1 Data transmission arrangement.
09/15/1981US4290139 Synchronization of a data communication receiver with a received signal
09/15/1981US4289939 Longitudinal balance arrangements for two-to-four wire telecommunication line circuits
09/15/1981CA1109173A1 Singing preventive system
09/15/1981CA1109133A1 Joint adaptive echo canceller and equalizer for two- wire full-duplex data transmission
09/08/1981US4288664 Neutralization signal developing device for an echo suppressor
09/08/1981US4288661 Interface circuitry for acoustic coupler compensation
09/08/1981CA1108707A1 Auto-adaptative equalizer
09/03/1981WO1981002500A1 Message communication system
09/03/1981WO1981002498A1 Transceiver for phase-shift modulated signals
09/01/1981US4287591 Communications transmission system
09/01/1981US4287469 Process and circuit arrangement for the measuring of coefficients of message-transmission equipment
09/01/1981CA1108236A1 Level control circuitry for two way communication system
08/1981
08/26/1981EP0034467A1 Receivers suitable for use in remotely-operable switching devices and data transmission systems
08/26/1981EP0034466A1 Transmission systems for transmitting signals over power distribution networks, and transmitters and receivers for use therein
08/25/1981US4286123 Bridge amplifier
08/25/1981CA1107869A1 Methods and apparatus for rejection of interference in a digital communications system
08/18/1981US4285061 Equalizer sample loading in voiceband data sets
08/18/1981US4285058 Waveform correction by sampling
08/18/1981US4285045 Delay circuit
08/18/1981US4284979 Coding system for simultaneously signaling selected ones of a plurality of devices
08/18/1981US4284859 Adaptive electronic hybrid circuit
08/12/1981EP0033568A1 Echo canceller with simplified computing circuits
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