H04B 3 - Line transmission systems

Patents for H04B 3 - Line transmission systems (31,523)
03/1977
03/15/1977	US4012704 Active amplitude equalizers
03/15/1977	US4012603 Echo suppressor having self-adaptive means
03/15/1977	US4012593 Bidirectional repeater in data transmission system
03/08/1977	US4011530 Two-path telephone line equalization system
03/08/1977	US4011405 Digital data transmission systems
02/1977
02/22/1977	US4009350 Level regulator of the digital type
02/15/1977	US4008467 Power line carrier communication system having efficient carrier signal coupling of distribution secondary lines
02/15/1977	US4008375 Digital voice switch for single or multiple channel applications
02/08/1977	US4007360 Method and apparatus for remote transmission of signals
02/08/1977	US4007341 Echo cancelling device
02/08/1977	US4007340 Distance-related variable gain amplifier
02/01/1977	US4006456 Loop fault location and isolation
02/01/1977	US4006352 Equalizer comprising first and second equalizing means and trainable in two steps
02/01/1977	US4006319 Foreign potential checker
01/1977
01/25/1977	US4005277 Echo controller comprising a mode switch for switching echo suppressor and canceller
01/25/1977	US4005276 Digital voice signaling with digital echo detection and voice activity compression used to cancel echo
01/18/1977	US4004253 Variable equalizer
01/18/1977	US4004226 QAM receiver having automatic adaptive equalizer
01/18/1977	US4004140 Digital attenuator
01/18/1977	US4004110 Power supply for power line carrier communication systems
01/18/1977	US4004102 Automatic impedance modification of transmission lines
01/18/1977	US4004101 Method and device for detecting occupancy of telecommunication channels
01/11/1977	US4003006 Pilot tone controlled adaptive amplitude equalizer
01/11/1977	US4002982 Digital transmission system using radio link and method of operating same
12/1976
12/28/1976	US4000467 Automatic repeater stressing
12/21/1976	US3999130 Automatic frequency translator for use with a delay/amplitude equalizer
12/14/1976	US3997841 Time domain equalizer for broadband communication systems
11/1976
11/30/1976	US3995238 Image waveguide transmission line and mode launchers utilizing same
11/23/1976	US3993989 ELF communications system using HVDC transmission line as antenna
11/23/1976	US3993952 Transmission system for pulse signals of fixed clock frequency
11/16/1976	US3992686 Backplane transmission line system
11/16/1976	US3992594 Echo suppressor break-in circuitry
11/09/1976	US3991288 Repeater housing assembly
11/09/1976	US3991287 Digital echo suppressor noise insertion
11/02/1976	US3990022 System for automatic equalization
11/02/1976	US3989907 Repeater for transmission lines of differing lengths
11/02/1976	US3989906 Repeater for transmission lines
10/1976
10/26/1976	US3988678 Circuit arrangement for the measuring of group delay and attenuation distortions
10/19/1976	US3987240 Direct current power system including standby for community antenna television networks
10/12/1976	US3986078 Devices for limiting the output voltage of current-controlled remote feed apparatuses
10/12/1976	US3985980 Triggered display for telephone line characteristic measuring instrument
10/12/1976	US3985979 Half-echo suppressor for a terminal of a four-wire electric line
10/12/1976	US3985956 Method of and means for detecting voice frequencies in telephone system
09/1976
09/28/1976	US3983486 Modular CATV system
09/28/1976	US3983381 Digital automatic gain control circuit
09/28/1976	US3983340 Automatic span line switch
09/21/1976	US3982080 Automatic cable balancing network
09/14/1976	US3980973 Line device for transmission lines having coaxial cables for the transmission of digital or analog signals
09/14/1976	US3980967 Differential feedback amplifier with frequency-shaped reference signal
09/14/1976	US3980954 Bidirectional communication system for electrical power networks
09/07/1976	US3979699 Directional coupler cascading for signal enhancement
09/07/1976	US3979687 Line amplifier
09/07/1976	US3979677 System for automatic equalization
09/07/1976	US3979559 Data modem having line verification and automatic disconnect features
08/1976
08/31/1976	US3978407 Fast start-up adaptive equalizer communication system using two data transmission rates
08/31/1976	US3978323 Apparatus for achieving predetermined transfer characteristics
08/31/1976	US3978283 Switching arrangement for receiving dc signals
08/31/1976	US3978282 Apparatus and method for measuring the transmission characteristics of a network
08/24/1976	US3976835 Supervisory systems for telecommunication line transmission system
08/17/1976	US3975686 Loss signal generation for delta-modulated signals
08/17/1976	US3975600 Telephone line splicing apparatus
08/17/1976	US3975594 Apparatus utilizing a phantom circuit for connecting additional subscribers to a telecommunication system
08/10/1976	US3974448 Use of equalizers in satellite communication transmission systems
08/10/1976	US3974447 Pilot receiver
08/10/1976	US3974345 Negative impedance repeater with double amplification, for telephone lines
08/03/1976	US3973240 Power line access data system
08/03/1976	US3973227 Transmission line for TDM communication system
08/03/1976	US3973170 Intrinsic safety barrier
08/03/1976	US3973112 System for determining transfer function
08/03/1976	US3973088 Wide-band hybrid network
08/03/1976	US3973087 Signal repeater for power line access data system
08/03/1976	US3973086 Digital echo suppressor break-in circuitry
07/1976
07/27/1976	USRE28919 Speech processor using controlled center clipping
07/27/1976	US3971998 Recursive detector-oscillator circuit
07/20/1976	US3970946 Demodulator for amplitude-and-phase modulated signals having control means for reducing phase and amplitude errors
07/20/1976	US3970926 Method and apparatus for measuring the group delay characteristics of a transmission path
07/20/1976	US3970784 Transmission system
07/06/1976	US3968427 Group delay measurement apparatus and method
06/1976
06/29/1976	US3967264 Distribution network power line communication system including addressable interrogation and response repeater
06/29/1976	US3967220 Variable delay equalizer
06/22/1976	US3965338 Apparatus for achieving a predetermined transfer characteristic
06/15/1976	US3964048 Communicating over power network within a building or other user location
06/15/1976	US3963992 Linear agc circuit with controlled duty cycle sampling means
06/08/1976	US3962547 Repeater coupler for power line communication systems
06/08/1976	US3962541 Frequency sample-and-hold circuit
05/1976
05/25/1976	US3959605 Circuit for detecting loss of telephone line voltage
05/11/1976	US3956601 Telecommunications analyzer
04/1976
04/27/1976	US3953808 Solid state amplifier
04/20/1976	US3952189 Complex analog waveform generator
04/20/1976	US3952163 Method and apparatus for testing in FDM system
04/13/1976	US3950676 Transmission line-communications equipment coupling unit having short-circuit and overvoltage protection
04/06/1976	US3949206 Filtering device
04/06/1976	US3949173 Device for the suppression of a pilot frequency in a multiplex transmission system
04/06/1976	US3949172 Telephone extension system utilizing power line carrier signals
03/1976
03/23/1976	US3946318 Automatic level control circuit for local oscillator signals with the lever control signal being derived from the DC current present in the diode circuit of an MIC frequency mixer
03/23/1976	US3946169 Bilateral signal transmission system
03/16/1976	US3944943 Broadband amplifier
03/16/1976	US3944723 Station for power line access data system
03/09/1976	US3943468 Amplitude equalizer using mixing for error detection
03/09/1976	US3943454 Digital logic circuits for producing digital sum and difference frequencies

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