Patents
Sitemap › H04 - Electric communication technique › H04B - Transmission › H04B 3 - Line transmission systems
Patents for H04B 3 - Line transmission systems (31,523)
12/1977
12/13/1977US4063183 Adaptive equalizer with improved distortion analysis
12/13/1977US4063034 Audio system with enhanced spatial effect
12/06/1977US4061978 Timing recovery for an automatically equalized data modem
12/06/1977US4061977 Phase tracking network
12/06/1977US4061970 Transmission system and repeater stations therefor
12/06/1977US4061892 Instruments and methods for measuring characteristics of only a selected portion of a transmission channel
12/06/1977US4061883 Repeater for transmission lines of differing lengths
12/06/1977US4061881 Method and apparatus for generating a number of weakly correlated pseudorandom pulse trains
11/1977
11/15/1977US4058678 Remote signalling to a telephone line utilizing power line carrier signals
11/08/1977US4057793 Current carrier communication system
11/08/1977US4057771 Frequency-response corrective network
11/08/1977US4057696 Recursive-like adaptive echo canceller
11/08/1977US4057695 Telecommunication system with controlled gain active filters
11/08/1977US4057691 Switching network with crosstalk elimination capability
11/01/1977US4056791 Apparatus for correcting distortion in low frequency cable
11/01/1977US4056790 Transmission system for pulse signals
11/01/1977US4056719 Two-way telephone transmission system utilizing opto-couplers
10/1977
10/25/1977US4055733 Line level signal measuring device
10/18/1977US4054910 Communication system for the transmission of closed circuit television over an ordinary pair of wires
10/11/1977US4053870 Digital signal level comparison device
10/11/1977US4053713 Multi-channel multiplex data transmission system
10/04/1977US4052559 Noise filtering device
10/04/1977US4052557 Phase-jump detector and corrector method and apparatus for phase-modulated communication systems that also provides a signal quality indication
09/1977
09/27/1977US4051333 Tip and ring conductor voltage tester
09/27/1977US4051332 Multiplex digital echo suppression system
09/20/1977US4049929 Apparatus for reducing the susceptibility of line signal repeaters to induced currents
09/20/1977US4049928 Self-adjusting voice frequency repeater
09/06/1977US4047013 Method and apparatus for fast determination of initial transversal equalizer coefficient values
08/1977
08/30/1977US4045684 Information transfer bus circuit with signal loss compensation
08/30/1977US4045624 Continuous monitoring in carrier telephone systems
08/16/1977US4042893 Method and apparatus for improving transmission line characteristics
08/16/1977US4042794 Method and means for detecting an outgoing failure in a bidirectional communications span and looping the same in response thereto
08/09/1977US4041324 Magnetic shield system for electric cars
08/09/1977US4041255 Switching circuit for telecommunications lines
08/09/1977US4041254 Telephone line characteristic display
08/09/1977US4041239 Method and apparatus for the transmission of data
08/02/1977US4040053 Transponder system for the transfer of signalling information for rail-bounded vehicles
08/02/1977US4040046 Remote data readout system for transmitting digital data over existing electrical power lines
08/02/1977US4039977 Adjustable compensating circuit having differential capacitor in each tunable stage
08/02/1977US4039967 Phase-locked loop having a slight phase offset error
08/02/1977US4039769 Instrument and method for measuring envelope delay in a transmission channel
07/1977
07/26/1977US4038600 Power control on satellite uplinks
07/26/1977US4038501 Apparatus and method for automatically connecting to the individual conductors of a multiconductor cable
07/19/1977US4037160 Method and apparatus for adjusting and readjusting an automatic corrector for a data signal transmission system
07/19/1977US4037066 Repeater for transmission lines
07/12/1977US4035772 Utility meter reading system
07/12/1977US4035747 Adjustable attenuation equalizer
07/12/1977US4035735 Demodulator comprising a phase shift circuit for controlling outputs of an automatic equalizer
07/12/1977US4035725 Automatic passband equalizer for data transmission systems
07/12/1977US4035625 Method and apparatus for performing binary equalization in voice-band phase-modulation modems
07/05/1977US4034296 Omni-frequency pilot system
06/1977
06/28/1977US4032911 Signal repeater for power distribution line communication systems
06/28/1977US4032866 Low loss frequency response corrective network
06/28/1977US4032847 Distortion adapter receiver having intersymbol interference correction
06/28/1977US4032726 Repeater for transmission lines of differing lengths
06/28/1977US4032718 Four-wire integrable hybrid
06/21/1977US4031528 Transmitting over power lines
06/21/1977US4031417 Apparatus for coupling a digital data generator to a digital data readout device with electrical isolation therebetween
06/21/1977US4031338 Echo suppressor using frequency-selective center clipping
06/14/1977US4030034 Overdrive protection circuit for power line carrier systems and the like
06/14/1977US4030016 Precision active rectifier circuit
06/14/1977US4029913 Remote accessing system for telephone lines
06/14/1977US4029912 Common control digital echo suppressor
06/14/1977US4029904 Receiver circuit for automatic correction of DC level disturbances
06/14/1977US4029894 Submerged repeater housing
06/07/1977US4028644 System equalization for repeatered submarine cable system
06/07/1977US4028628 Transceivers for single channel carrier telephone systems
06/07/1977US4028622 Selective intermodulation distortion measurement
06/07/1977US4028507 Apparatus for applying particular voltages to three-terminal circuits and measuring resulting current flows for the purpose of determining circuit characteristics
06/07/1977US4028506 Maximum value tracing circuit for digitized voice signals
06/07/1977US4028505 Negative impedance repeater for telephone lines
05/1977
05/31/1977US4027259 Line equalizer with differentially controlled complementary constant resistance networks
05/31/1977US4027257 Frequency domain automatic equalizer having logic circuitry
05/31/1977US4027118 Network having a transformer-coupled open-circuit stable negative impedance and a short-circuit stable positive impedance
05/31/1977US4027114 Echo prevention circuit
05/24/1977US4025737 Repeater monitoring and fault location
05/24/1977US4025736 Apparatus for measuring the value of a variable condition
05/24/1977US4025735 Negative conductance network
05/24/1977US4025719 Phase-directed decision feedback equalizer
05/17/1977US4024479 HF signal transmission device
05/17/1977US4024358 Adaptive echo canceller using differential pulse code modulation encoding
05/17/1977US4024357 Centering device for a transverse filter of an echo canceller
05/17/1977US4024356 Transmission system with balanced bridge to prevent low frequency cross talk
05/17/1977US4024346 Telephone line amplifier
05/10/1977US4023136 Borehole telemetry system
05/10/1977US4023112 Broad band amplifier having negative feedback and a controllable amplification factor
05/03/1977US4021797 Audio frequency power line control system
05/03/1977US4021625 Instruments and methods for measuring characteristics of only a selected portion of a transmission channel
05/03/1977US4021623 Automatic H-register clear for prevention of erroneous convolution in digital adaptive echo canceller
04/1977
04/26/1977US4020288 System for data transmission through the channels of a frequency division multiplex system
04/12/1977US4017845 Circuitry for simultaneous transmission of signals and power
04/12/1977US4017695 Customer operated gain control circuit
04/05/1977US4016497 Feedbackward distortion compensating circuit
04/05/1977US4016429 Power line carrier communication system for signaling customer locations through ground wire conductors
04/05/1977US4015472 Two-wire transmission system for vortex flowmeter
03/1977
03/29/1977US4015147 Low power transmission line terminator
03/22/1977US4013981 Constant-resistance coupled-line type equalizer
03/22/1977US4013962 Improved receiver selecting (voting) system
03/15/1977US4012734 Synchronous power communicating
03/15/1977US4012733 Distribution power line communication system including a messenger wire communications link
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