Patents
Sitemap › H04 - Electric communication technique › H04B - Transmission › H04B 3 - Line transmission systems
Patents for H04B 3 - Line transmission systems (31,523)
11/1978
11/14/1978US4125899 Bessel function type automatic delay equalizer
11/14/1978US4125812 Apparatus for baseline restoration in an AC-coupled signal
11/14/1978CA1042514A1 Digital data transmission systems
11/07/1978US4124772 Junction between coaxial main and branch transmission lines
11/07/1978CA1042107A1 Complex analog waveform generator
10/1978
10/31/1978US4123626 Digital echo attenuation circuit for a telephone system
10/31/1978CA1041684A1 Telephone line amplifier with selective gain
10/31/1978CA1041641A1 Telephone line testing system
10/31/1978CA1041613A1 Repositioning of equalizer tap-gain coefficients
10/24/1978US4122417 Variable equalizer
10/24/1978CA1041241A1 Automatic cable balancing network
10/24/1978CA1041240A1 Digital echo suppressor noise insertion
10/24/1978CA1041182A1 Automatic equalizing method and system
10/10/1978US4119912 Audio frequency heterodyne means and method
10/03/1978US4118672 Attenuation equalizer having constant resistance
09/1978
09/26/1978US4117277 Arrangement for simultaneous two-way data transmission over two-wire circuits
09/26/1978CA1039365A1 Signal transfer circuit
09/19/1978US4115668 Echo suppressor with SF transmission and regeneration
09/19/1978CA1038934A1 Spectrum notcher
09/12/1978US4114141 Digital communication system for transmitting digital information between a central station and a number of remote stations
09/12/1978US4114111 Constant phase delay network having a coherent reference
09/12/1978US4114107 Remotely fed intermediate amplifier for communication lines
09/12/1978US4114054 Coupling circuit using a photocoupler
09/12/1978US4113998 Testing electrically conductive lines to determine electrical characteristics thereof
09/12/1978US4113997 Analog to digital signal of logarithmic format converter and analog to pseudo-rms value converter and echo canceller utilizing same
09/12/1978CA1038454A1 Instrument for measuring harmonic distortion in telephone transmission
09/05/1978US4112262 Telephone station repeater
08/1978
08/29/1978US4110636 Feeding bridge
08/29/1978US4110572 Method and apparatus for testing transmission lines
08/29/1978US4110570 Surge protection device for repeater
08/29/1978CA1037573A1 Broad band directional signal generator
08/22/1978US4109212 Complementary distortion circuit
08/22/1978US4109204 Apparatus and method for wideband communication with suppression of harmonic interference
08/22/1978CA1037173A1 Paging intercommunication system
08/22/1978CA1037135A1 Frequency-response corrective network
08/15/1978US4107554 Data bus arrangement for Josephson tunneling device logic interconnections
08/15/1978CA1036736A1 Self-adjusting voice frequency repeater
08/15/1978CA1036735A1 Digital echo suppressor
08/15/1978CA1036729A1 Telephone line splicing apparatus
08/15/1978CA1036705A1 D.c. signal receiving circuit arrangements
08/08/1978US4106103 Derivation of discrete Fourier transform components of a time dependent signal
08/08/1978US4106102 Self-adaptive digital filter for noise and phase jitter reduction
08/08/1978US4106007 Method and apparatus for transmitting intelligence over a carrier wave
08/08/1978US4105995 Digitally controlled transmission impairment measuring apparatus
07/1978
07/25/1978US4103247 Variable gain amplifiers
07/18/1978US4101966 4-quadrant multiplier
07/18/1978US4101851 Variable equalizer
07/18/1978US4101834 Methods and apparatus for rejection of interference in a digital communications system
07/18/1978US4101743 Test circuit for a protective coupler
07/11/1978US4100604 Frequency domain automatic equalizer utilizing the discrete Fourier transform
07/11/1978US4100515 Communication circuit having precision capacitor multiplier
07/04/1978US4099217 Protection circuits
07/04/1978US4099036 Remote power supply system for a coaxial line with repeaters subjected to the influence of external electric fields
06/1978
06/27/1978US4097826 Insular waveguide ring resonator filter
06/27/1978US4097824 Variable equalizer
06/27/1978US4097807 Automatic equalizing method and system
06/27/1978US4097806 Adaptive equalizer with improved distortion analysis
06/27/1978US4097692 Method and apparatus for the two-way transmission of pulses
06/27/1978US4097687 Partial response system
06/20/1978US4096363 Transmission network including flux compensation
06/20/1978US4096361 Test apparatus for obtaining impedance settings for hybrid balance networks
05/1978
05/30/1978US4092618 Discrete transversal filter
05/30/1978US4092599 Annunciator communication system
05/23/1978US4091343 Insular waveguide directional coupler
05/09/1978US4089061 Method and apparatus for determining the initial values of the coefficients of a complex transversal equalizer
05/09/1978US4088851 Digital echo suppressor
05/09/1978US4088850 Remote supply system for a cable transmission line with repeaters subjected to the influence of external electric fields
05/02/1978US4087701 Transformer cascade for powering electronics on high voltage transmission lines
05/02/1978US4087658 Apparatus and method for determining frequencies for system maximum and minimum immittances
05/02/1978US4087657 Testing of inductively loaded transmission lines for correct loading
05/02/1978US4087656 Testing of inductively loaded transmission lines for correct loading
05/02/1978US4087654 Echo canceller for two-wire full duplex data transmission
04/1978
04/25/1978US4086534 Circuit for wire transmission of high frequency data communication pulse signals
04/25/1978US4086447 Electronic hybrid circuit for connecting a two-wire line to switching system
04/25/1978US4086428 Circuit arrangement for the automatic adjustment of a two-wire full duplex data transmission system
04/11/1978US4084155 Two-wire transmitter with totalizing counter
03/1978
03/21/1978US4080580 Variable equalizer
03/14/1978US4079202 Digital communication system
03/07/1978US4078255 Sequence generator having amplitudes and phases of spectral components randomly distributed
03/07/1978US4078216 Circuit for the parallel coupling of audio frequency central-control transmitting stations in a wave band filter construction
03/07/1978US4078157 Method and apparatus for regenerating a modified duobinary signal
02/1978
02/14/1978US4074087 Bidirectional voice frequency repeater
02/14/1978US4074086 Joint adaptive echo canceller and equalizer for two-wire full-duplex data transmission
02/14/1978US4074073 Pilot receiver memory unit in a carrier frequency system
02/07/1978US4072902 Receiver module and mixer thereof
02/07/1978US4072899 RF leak detector
02/07/1978US4072830 Variable phase shifter for adaptive echo cancellers
01/1978
01/31/1978US4071827 Transversal type automatic phase and amplitude equalizer
01/31/1978US4071782 Phaseless equalizer
01/24/1978US4070615 Compensation indicator for attenuation probe
01/10/1978US4068092 Voice control circuit
01/03/1978US4066912 Coupling arrangement for power line carrier systems
12/1977
12/27/1977US4065763 Distribution network power line communication system
12/27/1977US4065646 Power converter
12/20/1977USRE29499 On premise telephone loop tester
12/20/1977US4064397 Automatic equalizer having a coefficient matrix circuit
12/20/1977US4064379 Logarithmic echo canceller
12/20/1977US4064378 Echo cancelling system for multiplex telephone circuits
12/13/1977US4063187 Equalizer circuit
12/13/1977US4063184 Signal transfer circuit
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