Patents
Sitemap › H04 - Electric communication technique › H04B - Transmission › H04B 3 - Line transmission systems
Patents for H04B 3 - Line transmission systems (31,523)
12/1989
12/26/1989US4890089 Distribution of line carrier communications
12/20/1989EP0347394A1 Adaptive, digital filter including a non-recursive part and a recursive part
12/20/1989CN1038193A Adaptive, digital filter including non-recursive part and recursive part
12/19/1989US4888762 Echo canceller for bidirectional transmission on two-wire subscriber lines
12/19/1989US4888560 Gain-variable amplifier circuit
12/14/1989WO1989012360A1 Adaptive, digital filter including a non-recursive part and a recursive part
12/13/1989EP0345985A2 Communication circuit connection
12/12/1989US4887278 Equalizer for digital transmission systems
12/12/1989US4887258 Echo cancelling device with phase-roll correction
12/12/1989US4887257 Echo cancelling device for data transmission over two-wire lines
12/06/1989EP0344169A1 Transmission system.
12/05/1989US4885795 Hospital digital data transfer system
12/05/1989US4885757 Digital adaptive receiver employing maximum-likelihood sequence estimation with neural networks
12/05/1989US4885749 Data transmission with improved message format
12/05/1989US4885737 Echo canceler having simplified calculation circuits
12/05/1989US4885563 Power line carrier communication system
12/05/1989US4885555 Interconnection for high fidelity signals
11/1989
11/29/1989EP0343189A1 Tdma communications system with adaptive equalization.
11/29/1989CN2048650U Two-way amplifier communication signal
11/29/1989CN1037624A 信号传输的方法 The method of signal transmission
11/28/1989CA1263461A1 Surface lining for feeding an electrical receiver at various positions on the surface
11/21/1989US4882749 Control of signal transmission
11/21/1989US4882547 Linearizer control system
11/14/1989US4881221 Method and apparatus for disabling an echo canceller on a digital telecommunications network
11/09/1989DE3807147A1 Verfahren und anordnung zur messung des zeitlichen verlaufs eines periodischen signals mit hoher zeitaufloesung nach einem boxcar-aehnlichen verfahren The method and process arrangement for measuring the temporal course of a periodic signal with high time resolution according to a similar boxcar
11/08/1989EP0340978A2 Modulator/demodulator apparatus
11/07/1989US4879745 Half-duplex speakerphone
11/07/1989US4879738 Digital telephony card for use in an operator system
11/07/1989US4879661 Bi-directional circuit to interface between a low current device and high current tester
11/02/1989WO1989008266A3 Measurement of the variation in time of a periodic signal
11/02/1989EP0339201A2 Feeding circuit for terminals by a connection line with digital information transmission
11/02/1989EP0339078A1 Broadband local area network
10/1989
10/31/1989US4878232 Data transmission system
10/31/1989US4878188 Selective active cancellation system for repetitive phenomena
10/25/1989EP0338804A1 Automatic level control system for broadband cable systems
10/25/1989EP0338126A2 Method and apparatus for testing twisted-pair interconnections of a local area network
10/25/1989EP0324012A4 Shorted-coaxial-cable detector for local-area networks.
10/24/1989US4876520 Coaxial switching system with switched shields and crosstalk suppression
10/18/1989EP0337709A1 Magnetic flux transmission system
10/18/1989EP0337254A2 Communication link between moving bodies
10/18/1989CN2046300U Two-tone acoustic frequency electrical level displaying apparatus
10/17/1989US4875223 Twisted pair adapter
10/17/1989US4875205 Crosstalk reduction in unshielded twisted-pair lines
10/17/1989US4875112 Compound pulse dimming circuitry for conditioning readback signals
10/11/1989EP0335948A1 Decoupling network and communication system
10/11/1989CN2045916U Microwave changeover machine for 960-route long-distance cable in emergency
10/10/1989US4873700 Auto-threshold/adaptive equalizer
10/10/1989US4873502 Negative immittance converter
09/1989
09/27/1989EP0334442A1 Echo canceller for phase variable echo signal
09/27/1989EP0333817A1 Adapter between coaxial cable and twisted pair cables
09/27/1989EP0333718A1 Echo canceller with adaptive dynamically positioned taps.
09/27/1989EP0199727B1 Method to test the function of an adaptive echo canceller
09/26/1989US4870675 Remote testing of metallic loops with a trans hybrid signal
09/26/1989US4870658 Amplitude equalizer
09/26/1989US4870657 Data signal transmission system using decision feedback equalization
09/26/1989CA1261968A1 Patient identification and verification system and method
09/26/1989CA1261496A1 Line equalizer having pulse-width deviation detector for compensating long-term level variations
09/26/1989CA1261008A1 Adaptive transversal filter
09/26/1989CA1260643A1 Control of signal transmission
09/26/1989CA1260573A1 Low power line driving digital transmission system
09/26/1989CA1260553A1 Digital filters
09/26/1989CA1260059A1 Current limiter for power line communication amplifier
09/20/1989EP0333581A1 Echo cancelling device with filtration into frequency sub-bands
09/20/1989EP0333227A2 Echo canceller
09/20/1989CN2044780U Automatic balancer for automatic stabilizing frequency of level of audio terminal
09/19/1989US4868887 Cable-car with information transmission via the cable
09/19/1989US4868874 Echo canceller
09/19/1989US4868850 MODEM communication system having training means and method for training same
09/19/1989US4868775 Adaptive digital filter
09/19/1989US4868650 Circuitry for expanding the effect of a video control signal in multiple dimensions
09/19/1989US4868539 Bi-directional multi-frequency ripple control system
09/19/1989CA1259668A1 Automatically variable phase characteristic all-pass circuit
09/14/1989DE3806949A1 Method for control and/or monitoring
09/14/1989DE3806948A1 Verfahren zum adressieren von prozessoreinheiten Method for addressing processor units
09/13/1989EP0332290A2 Equaliser for radio receiver
09/13/1989EP0332079A2 Adaptive equalizer system
09/12/1989US4866757 Combined telephone and power distribution system
09/12/1989US4866736 Data transmission system comprising a decision feedback equalizer and using partial-response techniques
09/12/1989US4866733 Radio bus system
09/12/1989CA1259385A1 Cross-polarization canceler/equalizer
09/08/1989WO1989008359A1 Process for addressing processing units
09/08/1989WO1989008358A1 Device for in-process monitoring of transmission systems
09/08/1989WO1989008354A1 Process for controlling and/or monitoring and circuit arrangement for implementing the process
09/08/1989WO1989008266A2 Measurement of the variation in time of a periodic signal
09/06/1989CN2044107U Safety appliance used for broadcasting transmitted by power cable
09/06/1989CN1035403A Cancelling circuit and transmission system
09/05/1989USH678 System for transmitting low frequency analog signals over AC power lines
09/05/1989US4864608 Echo suppressor
09/05/1989US4864589 Spread spectrum power line communications
09/05/1989US4864296 System for synchronizing signals on a two-wire line
09/05/1989CA1259145A1 Selectable impedance line interface circuit
09/05/1989CA1259144A1 Linear predictive echo canceller integrated with relp vocoder
08/1989
08/29/1989US4862491 Remote disconnection and short-circuiting apparatus and method
08/29/1989US4862450 Arrangement for cancelling a composite echo signal
08/29/1989US4862449 Adjustable echo canceller
08/29/1989US4862157 Signal transfer method and equipment for electric machine equipped with three-phase power supply cable
08/29/1989US4862103 Variable equalization system
08/29/1989US4860968 Communication link between moving bodies
08/29/1989CA1258885A1 Transversal equalizer
08/24/1989WO1989007864A1 Multipath reduction system
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