Patents
Sitemap › H04 - Electric communication technique › H04B - Transmission › H04B 3 - Line transmission systems
Patents for H04B 3 - Line transmission systems (31,523)
09/1979
09/25/1979US4169215 Signal limiting circuit
09/25/1979CA1063247A1 Digital automatic gain control circuit
09/25/1979CA1063186A1 Recursive detector-oscillator circuit
09/19/1979EP0004054A1 Circuit for automatically equalizing a signal
09/18/1979CA1062824A1 Two-way telephone transmission system utilizing opto-couplers
09/11/1979US4167653 Adaptive speech signal detector
09/11/1979CA1062385A1 Echo prevention circuit
09/05/1979EP0003808A1 Large band width amplifier with a first and a second transistor stage
09/04/1979US4166981 Continuous signal amplitude regulator
09/04/1979US4166924 Removing reverberative echo components in speech signals
08/1979
08/28/1979US4166196 Electric direct current telegraphy transmitter
08/28/1979CA1061409A1 Method and apparatus for testing transmission lines
08/21/1979US4165449 Echo suppressor circuit
08/21/1979CA1061005A1 Data communications
08/21/1979CA1060954A1 Transponder system for the transfer of signalling information for rail-bounded vehicles
08/14/1979CA1060547A1 Receiver in a transmission system for binary pulse signals, comprising a circuit for automatic correction of dc level disturbances
08/08/1979EP0003234A1 Process and device for non-linear equalization on sequences of digital signals
07/1979
07/31/1979US4163218 Electronic multiple device control system
07/31/1979US4163210 Arrangement for checking a contact inserted between a transmitter circuit and a receiver circuit to allow electrical signals to be transmitted
07/25/1979EP0003138A1 Wide band amplifier comprising an amplifying part and a feedback part
07/24/1979US4162378 Digital echo canceler for a modem for data transmission by means of modulation of a carrier
07/17/1979US4161633 Subscriber line/trunk circuit
07/11/1979EP0002790A2 Measuring device for frequency analysis of signal levels within a large dynamic range
07/11/1979EP0002693A1 Method for low-distortion transmission of wide-band signals over balanced or unbalanced lines
07/10/1979US4161008 Protection circuitry for cable transmission system
07/10/1979US4160884 Power regulation system for repeatered telephone transmission lines
07/10/1979US4160880 Modular termination system for communication lines
07/10/1979US4160873 Level control circuitry for two way communication system
07/10/1979CA1058089A1 Power line carrier communication system for signaling customer locations through ground wire conductors
07/03/1979US4160276 Aperture correction circuit
07/03/1979US4160134 Digital signal level measurement
06/1979
06/26/1979CA1057436A1 Telephone extension system utilizing power line carrier signals
06/19/1979CA1056919A1 Automatic compensating circuit
06/12/1979US4158113 Level regulator governed by a pilot tone
06/12/1979CA1056522A1 Multiplex digital echo suppression system
06/12/1979CA1056469A1 Low loss frequency response corrective network
06/12/1979CA1056461A1 Protective relaying modem receiver
06/12/1979CA1056460A1 Bidirectional communication system for electrical power networks
05/1979
05/22/1979CA1054946A1 Systems for transmitting information in an alternating current electricity supply system
05/15/1979CA1054732A1 Satellite data transmission systems
05/15/1979CA1054689A1 Automatic impedance modification of transmission lines
05/15/1979CA1054688A1 Adaptive amplitude equalizer
05/15/1979CA1054680A1 Transceiver having improved voice actuated carrier and echo suppression circuit
05/01/1979US4152657 Echo suppression circuit
05/01/1979US4152649 Channel equalization apparatus and method using the Fourier transform technique
04/1979
04/24/1979US4151608 Circuit arrangement for suppressing magnetic induction noise due to an alternating magnetic field
04/24/1979US4151524 Multipath communications system
04/24/1979US4151490 Automatic cable equalizer circuit
04/17/1979CA1052921A1 Repeater for transmission lines
04/17/1979CA1052703A1 Central station for power line access data system
04/17/1979CA1052702A1 Power line access data system
04/10/1979US4149044 Method and apparatus for graphically displaying amplitude and phase jitter
04/10/1979CA1052280A1 Transmitting over power lines
04/03/1979US4147900 Telephone network protective coupler
04/03/1979CA1051995A1 Intrinsic safety barrier
03/1979
03/27/1979CA1051524A1 Method and apparatus for adjusting and readjusting an automatic corrector for a data signal transmission system
03/27/1979CA1051347A1 Signal repeater for power line access data system
03/20/1979US4145674 Electromagnetic interference suppression system for electrical equipment
03/13/1979US4144417 Echo cancelling system
03/13/1979CA1050673A1 Repeater for transmission lines of differing lengths
03/06/1979US4143251 Circuitry and method for locating buried cable splices
03/06/1979CA1050124A1 Cable distortion correction circuits
02/1979
02/27/1979US4142178 High voltage signal coupler for a distribution network power line carrier communication system
02/27/1979US4142075 Interface circuit and method for telephone extension lines
02/27/1979US4141615 Casing for electrical equipment
02/20/1979US4141072 Frequency domain automatic equalizer using minimum mean square error correction criteria
02/20/1979US4140983 Method for automatically equalizing the delay characteristics of a transmission line
02/20/1979US4140974 Distortion corrector for the adaptive base band correction of a phase-modulated signal
02/20/1979US4140874 Automatic compensating circuit
02/13/1979US4139829 Method for adjusting a band division type equalizer
02/13/1979US4139745 Telephone line test system
02/13/1979US4139735 Carrier current communications system
02/13/1979CA1048669A1 Subscriber loop verification device and method
02/06/1979CA1047936A1 Transmission system for pulse signals of fixed clock frequency
01/1979
01/30/1979US4137501 Noise suppression device
01/30/1979CA1047659A1 Active hybrid circuit
01/30/1979CA1047658A1 Method for detecting the presence of speech band activity in a telephone connection and a circuit for carrying out such method
01/30/1979CA1047605A1 Security system
01/23/1979US4136327 Well survey system modulation technique
01/23/1979US4136319 Filtering device for high-voltage power lines used as high-frequency transmission media
01/23/1979US4136267 Transmission systems
01/23/1979CA1047126A1 Phase-locked loop having a slight phase offset error
01/16/1979US4135181 Automatic remote meter reading and control system
01/16/1979US4135064 Impedance compensation of transmission line
01/16/1979CA1046599A1 Transmission line frequency separation filter
01/16/1979CA1046598A1 Active amplitude equalizers
01/16/1979CA1046597A1 Automatic passband equalizer for data transmission systems
01/16/1979CA1046592A1 System for automatic equilization
01/02/1979CA1045734A2 Digital echo suppressor
12/1978
12/26/1978US4131882 Digital two-wire irrigation control system with feedback
12/26/1978US4131859 Method of compensation of intermodulation noise and devices for the implementing thereof
12/26/1978US4131767 Echo cancellation in two-wire, two-way data transmission systems
12/19/1978US4130861 Power line carrier noise elimination
12/19/1978US4130743 Terminal equipment for a multiplex carrier current telephone system
12/19/1978US4130724 Data receiver with synchronizing sequence detection circuit
12/19/1978CA1044605A1 Power line communication system having a protective terminating impedance arrangement
12/12/1978US4129753 Echo canceller using feedback to improve speech detector performance
12/12/1978CA1044388A1 Intercom call signaling mechanism
12/12/1978CA1044338A1 Neutralizing transformer arrangement
11/1978
11/21/1978US4126770 Echo canceller
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