| Patents for H04B 3 - Line transmission systems (31,523) |
|---|
| 06/09/1987 | US4672630 Training method of data receiving equipment |
| 06/04/1987 | WO1987003440A1 Interface circuit |
| 06/02/1987 | US4670903 Echo canceller for attenuating acoustic echo signals on a frequency divisional manner |
| 06/02/1987 | CA1222587A1 Noise control circuit |
| 05/26/1987 | US4669116 Non-linear echo cancellation of data signals |
| 05/26/1987 | US4669092 Arrangement for receiving digital data comprising an arrangement for adaptive timing recovery |
| 05/26/1987 | US4668934 Receiver apparatus for three-phase power line carrier communications |
| 05/21/1987 | WO1987003100A1 Proximity detector |
| 05/20/1987 | EP0222428A1 Adaptive filter |
| 05/20/1987 | CN85106918A 回音消除器 Echo canceller |
| 05/19/1987 | US4667194 Monitoring system for use with elongate heater units |
| 05/13/1987 | EP0221401A1 Rotating data transmission device |
| 05/13/1987 | EP0221221A1 A process for determining an echo path flat delay and echo canceler using said process |
| 05/13/1987 | EP0132272B1 Telecommunication terminal |
| 05/13/1987 | CN86107097A Two wires communication mode |
| 05/12/1987 | US4665534 Method of and apparatus for determining time origin of timer for modem |
| 05/12/1987 | CA1221749A1 Fractionally spaced equalization using nyquist-rate coefficient updating |
| 05/07/1987 | DE3538497A1 Control circuit for regulating the gain of an amplifier |
| 05/05/1987 | US4663583 Automatically variable phase characteristic all-pass circuit |
| 05/05/1987 | CA1221432A1 Remote monitoring system transmitter and power supply therefor |
| 05/05/1987 | CA1221430A1 Fast convergence method and system for echo canceller |
| 04/29/1987 | EP0219618A1 Surveillance system including transmitter and receiver synchronized by power line zero crossings |
| 04/29/1987 | EP0219537A1 Method and apparatus for adjusting a digital equalizing filter in simultaneous adaptive echo elimination and adaptive elimination of noise caused by intersymbol interference. |
| 04/28/1987 | US4662002 Optical repeaters |
| 04/28/1987 | US4661816 Adaptive radar signal processor |
| 04/28/1987 | US4660973 Arrangement for locating faults in an optical information transmission system |
| 04/28/1987 | CA1221180A1 Method of and device for the digital cancellation of the echo generated in connections with time-varying characteristics |
| 04/28/1987 | CA1221157A1 Circuit arrangement comprising an amplifier and an electronic selector switch |
| 04/22/1987 | EP0219120A2 Two-wire communication system |
| 04/21/1987 | CA1220824A1 Apparatus and method for sampling multiple carrier signals |
| 04/21/1987 | CA1220823A1 Adaptive filter update gain normalization |
| 04/15/1987 | EP0218181A1 Adaptive transversal equalizer |
| 04/14/1987 | US4658420 Tone responsible disabler circuit for an echo canceller |
| 04/14/1987 | US4658241 Surveillance system including transmitter and receiver synchronized by power line zero crossings |
| 04/14/1987 | US4658238 Method and apparatus for providing selectively variable modulation signal for a carrier wave |
| 04/14/1987 | US4658225 Circuit for filtering an input signal |
| 04/14/1987 | US4658099 Apparatus and method for remotely determining the presence of unauthorized surveillance devices on a communications line |
| 04/14/1987 | CA1220537A1 Echo canceller systems |
| 04/09/1987 | DE3634142A1 Circuit arrangement for transmitting information |
| 04/08/1987 | EP0217328A2 Transversal equalizer |
| 04/08/1987 | EP0217120A2 Echo canceller circuitry |
| 04/08/1987 | EP0216941A1 Apparatus for analysing two-channel transmission/reflection characteristics |
| 04/07/1987 | US4656661 Switched capacitor coupled line receiver circuit |
| 04/01/1987 | EP0216214A2 Method for the automatic level adjustment in a local area network, in particular for a multiprocessor arrangement with a bus system of optical fibres, for the purpose of collision detection |
| 04/01/1987 | EP0216141A2 Combined cross polarization interference cancellation and intersymbol interference equalization for terrestrial digital radio systems |
| 04/01/1987 | CN85106966A Decision feedback adaptive equalizer acting on zero states following a non-zero state |
| 03/31/1987 | US4654888 Image suppression mixer of the waveguide type |
| 03/31/1987 | US4654862 Digital signal transmission cable noise analyzer |
| 03/26/1987 | DE3533867A1 Echo cancellation method |
| 03/24/1987 | US4653114 Automatic terminal signal equalization |
| 03/24/1987 | US4653073 Low error rate digital demodulator |
| 03/24/1987 | US4653072 Low error rate digital demodulator |
| 03/24/1987 | US4652703 Digital voice transmission having improved echo suppression |
| 03/24/1987 | CA1219650A1 Noise reduction in signal transmission system over building power distribution wiring |
| 03/24/1987 | CA1219649A1 Echo cancelling system comprising cascade-connected local echo cancellers operable independently of one another |
| 03/24/1987 | CA1219648A1 Adaptive echo canceller |
| 03/18/1987 | CN85106370A Signal transmiting method and device used for electrical equipment with three-phase power supply cable |
| 03/17/1987 | US4650930 Adaptive equalizer |
| 03/11/1987 | EP0213768A2 On-line serial communication interfaces |
| 03/11/1987 | EP0213767A2 Current loop arrangements |
| 03/11/1987 | EP0213224A1 Method for rapid gain acquisition in a modem receiver |
| 03/10/1987 | US4649335 Equipment for locating a signal reflection point in a transmission line |
| 03/10/1987 | CA1219092A1 Time-division-multiplex loop telecommunication system comprising a first and a second transmission line |
| 03/04/1987 | EP0212897A2 On-line serial communication interfaces |
| 03/04/1987 | EP0212896A2 Current loop arrangements |
| 03/04/1987 | EP0212307A2 Ripple control receiver |
| 03/04/1987 | EP0211995A1 Method and arrangement for detecting the presence of a training signal in a modem receiver |
| 03/03/1987 | US4648111 Self-adaptive echo canceller capable of keeping a degree of cancellation substantially invariable even at a low incoming level |
| 03/03/1987 | CA1218712A1 Baseband-controlled passband equalizing arrangement |
| 02/26/1987 | DE3529395A1 Arrangement for active reduction protection |
| 02/25/1987 | EP0211750A2 Data transmission system |
| 02/25/1987 | EP0211567A2 Spread spectrum power line communications |
| 02/24/1987 | US4646327 Waveform shaping apparatus |
| 02/24/1987 | US4646319 Bidirectional bus coupler presenting peak impedance at carrier frequency |
| 02/24/1987 | US4646289 Signal multiplexing circuit |
| 02/24/1987 | US4645956 Current limiter for power line communication amplifier |
| 02/24/1987 | US4645884 Method and apparatus for initializing filter coefficients in an echo canceller |
| 02/24/1987 | US4645883 Double talk and line noise detector for a echo canceller |
| 02/18/1987 | CN86104912A Pulse-controlling receiver |
| 02/17/1987 | US4644566 Low error rate digital demodulator |
| 02/17/1987 | US4644562 Combined cross polarization interference cancellation and intersymbol interference equalization for terrestrial digital radio systems |
| 02/17/1987 | US4644479 Diagnostic apparatus |
| 02/17/1987 | US4644458 Electric power supply circuit capable of reducing a loss of electric power |
| 02/17/1987 | US4644424 Equalizer used for magnetic storage device |
| 02/17/1987 | US4644108 Adaptive sub-band echo suppressor |
| 02/17/1987 | CA1218120A1 Automatic adaptive equalizer |
| 02/12/1987 | WO1987000995A1 An intermediate amplifier for use in two-wire connections of a dial telephone network and a method for the gain control of said amplifier |
| 02/12/1987 | DE3528129A1 Pulse modulation method |
| 02/11/1987 | CN85109498A Automatic monitoring and testing device for carrier equipment group |
| 02/10/1987 | US4642607 Power line carrier communications system transformer bridge |
| 02/10/1987 | CA1217887A Single power supply battery feed circuit |
| 02/10/1987 | CA1217856A Apparatus for echo cancellation, in particular for a data broadcasting system |
| 02/03/1987 | US4641372 Power feeding submarine telecommunications systems |
| 02/03/1987 | US4641322 System for carrying out spread spectrum communication through an electric power line |
| 02/03/1987 | US4641126 Multiple-mode electrical power and communications interface |
| 01/29/1987 | WO1987000659A1 Patient identification and verification system and method |
| 01/28/1987 | CN85105588A Semi-automatic digital hybrid and methods |
| 01/27/1987 | US4639935 Apparatus for correcting frequency-dependent attenuation of the transmitting medium in signal transmission |
| 01/27/1987 | US4639933 Steering logic circuit for a digital data transceiver |
| 01/27/1987 | US4639795 Signal transmission circuit |