Patents
Sitemap › H04 - Electric communication technique › H04B - Transmission › H04B 3 - Line transmission systems
Patents for H04B 3 - Line transmission systems (31,523)
10/1991
10/09/1991CN1014291B Echo canceller
10/09/1991CN1014288B Adaptive digital filter including non-recursive part and recursive part
10/08/1991US5055795 Traveling wave type transversal equalizer
10/08/1991US5054876 Optical fiber telecommunication line including amplifiers distributed along the line for the transmitted signals
10/08/1991CA1290419C2 Multipurpose digital integrated circuit for communication and control network
10/08/1991CA1290412C High frequency signal apparatus and method of forming same
10/02/1991EP0449262A1 Integrated services digital network terminating resistor with line fault protector
10/02/1991EP0448881A2 Interference suppression system
10/02/1991EP0448758A1 Method for the determination of FIR filter coefficients in equalizers
10/02/1991EP0448754A1 Two-wire-four-wire converter
10/02/1991EP0448753A1 Two-wire-four-wire converter
10/02/1991EP0448742A1 Adaptive recursive digital filter
10/02/1991CN1014200B Digital automatic gain control
10/02/1991CN1014195B Two-wire loop electric circuit arrangement
10/01/1991US5054050 Drop testing in fiber to the home systems
09/1991
09/29/1991CA2039237A1 Integrated services digital network terminating resistor with line fault protector
09/25/1991EP0448251A2 Demodulating system capable of accurately equalizing received signals using error correction codes
09/25/1991EP0447842A1 Remote d.c. - power supply system for a cable
09/25/1991EP0309515B1 Two-wire loop electric circuit arrangement
09/24/1991US5052000 Technique for improving the operation of decision feedback equalizers in communications systems utilizing error correction
09/24/1991US5051942 Method and apparatus for calculating filter factors
09/24/1991US5051709 Saw device tapped delay line and equalizer
09/18/1991EP0446917A2 Circuit for controlling tap gains at rapid speed in an adaptive filter
09/18/1991EP0446276A1 Adaptive rate control for echo cancelling modem.
09/18/1991CA2036865A1 Interference suppression
09/17/1991US5050160 Training method for an echo canceller for use in a voice conference system
09/17/1991CA1289204C Agc circuit
09/17/1991CA1289198C Line equalizer
09/11/1991EP0445380A2 Apparatus for generating a compensation signal in digital transmission devices
09/11/1991EP0445375A1 Method of in-house voice and data communication via the home power distribution network
09/11/1991CN1054514A 频率响应均衡器 Frequency response equalizer
09/10/1991US5048055 Multi-data rate selectable equalizer
09/10/1991US5048054 Line probing modem
09/10/1991US5047859 Method and apparatus for communication channel identification and signal restoration
09/10/1991US5047736 Selective interference reduction in transmission lines
09/10/1991CA2037557A1 Method for in-house voice and data communication through the in-house power supply
09/10/1991CA1288826C Circuit for cancelling whole or part of a waveform using nonrecursive and recursive filters
09/09/1991CA2037636A1 Arrangement for generating a compensation signal for digital transmission equipment
09/04/1991EP0445057A2 Multi-data rate selectable equalizer
09/04/1991EP0444322A2 Car radio with digital equalizer
09/03/1991US5046072 Signal distribution system
09/03/1991CA1288493C Apparatus for controlling a switching amplifier
09/03/1991CA1288482C Enhanced automatic line build out
08/1991
08/28/1991EP0443732A2 Load circuit for differential driver
08/28/1991EP0443547A2 Sub-band acoustic echo canceller
08/28/1991EP0443333A1 Cross-polarization interference canceller
08/28/1991EP0443115A1 Wave digital filter composed of memories and n-port adaptors
08/28/1991CN1054135A Method of and apparatus for surveying and evaluating linearity of transmitting system
08/27/1991US5043949 Data signal transmission cable and method
08/27/1991CA1288186C Device for performing the "hands-free" function in a telephone set association the gain switching and echo suppression functions
08/22/1991DE4005130A1 Frequency compensation for long HF cables - separates feed signal source from pilot amplifier in short time intervals
08/21/1991EP0442259A1 Regenerative RF bi-directional amplifier system
08/21/1991EP0441808A1 Method and apparatus for decoding a quadrature modulated signal
08/21/1991EP0396666A4 Selective active cancellation system for repetitive phenomena
08/21/1991EP0280719B1 Linear predictive echo canceller integrated with relp vocoder
08/21/1991CN2083360U Supergroup high level killer
08/21/1991CN1053982A Method and equipment for communication in underground channel
08/20/1991US5042084 Three wire system for Cochlear implant processor
08/20/1991US5042026 Circuit for cancelling whole or part of a waveform using nonrecursive and recursive filters
08/20/1991US5041415 Superconducting noise discriminator
08/20/1991CA1287870C Switch bypass circuit for power line communication systems
08/14/1991WO1991012697A1 Method and device for single measurement to display and qualify the linearity of a transmission channel
08/14/1991DE4003791A1 Strip cable connector for telephone handset - has cable inner cores intersecting at one or several points
08/14/1991CA2051111A1 Single measurement method, and device, for displaying and rating the linearity of a transmission system
08/10/1991WO1991012579A1 Digital virtual earth active cancellation system
08/07/1991WO1991012681A1 Interconnecting and processing system for facilitating frequency hopping
08/06/1991US5038113 Nonlinearity generator using FET source-to-drain conductive path
07/1991
07/31/1991EP0439139A2 Arrangement and method for rapidly detecting double talk in long distance telephone communications system
07/25/1991DE4001266A1 FSK digital data transmission over power supply networks - involves synchronised read-out of frequencies stored in microcontroller's memory with no time lag between sample values
07/25/1991DE4001265A1 FSK digital data reception over power supply network - synchronising switching of signal with max. possible mean level to VCO clocked by control calculator
07/24/1991EP0437885A2 Frequency response equalizing
07/23/1991CA1286731C Digital adaptive filter for a high throughput digital adaptive processor
07/18/1991DE4001094A1 Wide band cable TV system - has switch, impedance and evaluating circuit open circuiting sec. side of transformer upon power flow reversal
07/17/1991EP0436808A2 Summing amplifier with a complex weighting factor and interface with such a summing amplifier
07/17/1991CN2081177U Self-correcting type light guide sensor
07/16/1991US5032833 Adaptive network routing for power line communications
07/16/1991CA1286399C Apparatus for transmitting digital signal
07/09/1991US5031194 Wideband digital equalizers for subscriber loops
07/09/1991US5031176 Connection interface of an information receiving part of a station in a differential information transmission system through two transmission lines, in particular in an automobile vehicle
07/09/1991CA1285999C Analog/digital adaptive line enhancer
07/03/1991EP0435400A1 Supply power injector for wideband distribution network
07/03/1991EP0305484B1 Device employing a tensile force meter for measuring tensile force
07/03/1991CN1052762A Decoding equalizer
07/02/1991US5029334 Process for transferring data packets
07/02/1991US5029204 Operational status controller for echo canceling
07/02/1991US5029167 Coefficient storage reduction in adaptive filters in echo cancellers or decision feedback equalizers
07/02/1991CA1285630C2 Proximity detection system for doors and the like
07/02/1991CA1285629C2 Proximity detection system for doors and the like
07/02/1991CA1285627C Proximity detection system for doors and the like
07/02/1991CA1285623C Apparatus for matching unbalanced r.f. baseband signals to balancedsignals on a twisted two-wire line
07/02/1991CA1285494C Paging system
06/1991
06/28/1991WO1991010291A1 Board for surge absorbing device of communication line
06/28/1991CA2045670A1 Circuit board for surge absorber for communication lines
06/26/1991CN2079837U Single analising apparatus for power supply
06/25/1991US5027371 Self-adaptive equalizer circuit for a differentially coherent demodulation installation
06/25/1991US5027370 Circuit arrangement for the equalization of digital signals received in analog form
06/25/1991CA1285324C Temperature compensated output buffer
06/19/1991EP0433023A2 Improved interference suppression in optical communication systems
06/18/1991US5025453 Method of measuring the signature of digital transmission equipment, and apparatus for implementing such a method
06/18/1991US5025234 Transversal filter with wide band phase shifters in series with the delay cells
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