| Patents for H04B 3 - Line transmission systems (31,523) |
|---|
| 04/18/1989 | US4823095 Remote connection of termination network |
| 04/18/1989 | CA1252843A1 Bidirectional adaptive voice frequency repeater |
| 04/18/1989 | CA1252831A1 Equalizer with improved performance |
| 04/12/1989 | EP0310877A1 Method and circuit arrangement for collecting self-monitoring information in information transmission systems |
| 04/12/1989 | CN1032414A Improved external circuit of automatic line |
| 04/11/1989 | US4821267 Monitoring apparatus for monitoring the operating condition of transmission facilities of communications transmission technology |
| 04/11/1989 | CA1252535A1 Adaptive communication network and method |
| 04/11/1989 | CA1252534A1 Signal transfer method and equipment for electric machine equipped with three-phase power supply cable |
| 04/11/1989 | CA1252533A1 Bi-directional multi-frequency ripple control system |
| 04/05/1989 | EP0310237A2 Line build out circuits |
| 04/05/1989 | EP0310055A1 Adaptive echo-canceller with double-talker detection |
| 04/05/1989 | EP0309888A1 Method and circuit arrangement for producing filtered signals |
| 04/05/1989 | EP0309802A2 Interface circuit for connecting test instrumentation |
| 04/05/1989 | EP0309515A1 Two-wire loop electric circuit arrangement. |
| 04/04/1989 | CA1252167A1 Apparatus for transmitting and receiving a power line carrier signal |
| 04/04/1989 | CA1252166A1 Echo canceller using delta modulation |
| 03/30/1989 | DE3730234A1 Method for echo suppression |
| 03/29/1989 | EP0309250A2 Correlation detecting circuit operable in a low frequency |
| 03/29/1989 | EP0308959A2 Receiver capable of improving signal-to-noise ratio in reproducing digital signals |
| 03/29/1989 | EP0308501A1 Digital adaptive filter |
| 03/29/1989 | EP0191784B1 Optical receiver circuit |
| 03/28/1989 | US4817081 Adaptive filter for producing an echo cancellation signal in a transceiver system for duplex digital communication through one single pair of conductors |
| 03/28/1989 | US4816773 Non-inverting repeater circuit for use in semiconductor circuit interconnections |
| 03/28/1989 | US4816703 On-line serial communication interface from a current loop to a computer and/or terminal |
| 03/23/1989 | WO1989002684A1 Adapter between coaxial cable and twisted pair cables |
| 03/23/1989 | WO1989002590A1 Enhanced system for transmission loss comparison |
| 03/22/1989 | EP0307765A1 Arrangement for detecting periodic signals for a speech echo canceller |
| 03/22/1989 | EP0307453A1 I-q channel adaptive line enhancer |
| 03/22/1989 | CN1031915A 回声抵消器 Echo canceller |
| 03/21/1989 | US4815127 Communication system using unbalanced communication paths |
| 03/21/1989 | US4815106 Power line communication apparatus |
| 03/21/1989 | US4814689 Method of measuring a cable delay time |
| 03/21/1989 | US4814637 Pulse shaper |
| 03/21/1989 | CA1251586A1 Ensemble modem structure for imperfect transmission media |
| 03/15/1989 | EP0307035A2 Adjusting filter coefficients |
| 03/15/1989 | CN1031166A Adjustable echo canceller |
| 03/14/1989 | US4813073 Echo cancellation |
| 03/14/1989 | US4812738 Apparatus for analyzing transmission/reflection characteristics |
| 03/14/1989 | CA1251269A1 Noise cancellation |
| 03/08/1989 | EP0306059A2 Telemetry system with signal booster for digital data transmission through a transmission line |
| 03/08/1989 | EP0305484A1 Device employing a tensile force meter for measuring tensile force. |
| 03/08/1989 | CN1003555B Full duplex speakerphone for radio and landline telephones |
| 03/07/1989 | US4811384 Method for level regulation of message information |
| 03/07/1989 | US4811342 High speed analog echo canceller |
| 03/07/1989 | US4810898 RF network isolation switch |
| 03/07/1989 | CA1250910A1 Asynchronous and non-data decision directed equalizer adjustment |
| 03/02/1989 | DE3827962A1 Filter zur unterdrueckung von oberflaechen-interferenzen fuer satellitenkommunikations-empfaenger Filter to suppress surface until-interferences for satellite communication-empfaenger |
| 03/01/1989 | EP0305265A1 Electrical-information transmission apparatus |
| 02/28/1989 | US4809363 Method for automatic level matching in a local network, in particular a multicomputer arrangement, comprising a bus system having light waveguides, for the purpose of collision recognition |
| 02/28/1989 | US4809296 Method for transmitting data via the lines of a power supply system |
| 02/28/1989 | CA1250633A1 Method to test the function of an adaptive echo canceller |
| 02/23/1989 | WO1989001723A1 Echo canceller |
| 02/23/1989 | DE3804548C1 Method and arrangement for monitoring the function of an active reduction protection device |
| 02/22/1989 | EP0304362A1 Digital calculating apparatus for data transmission equipment using code 2B1Q or the like |
| 02/22/1989 | EP0304081A2 Digital communication system using partial response and bipolar coding techniques |
| 02/22/1989 | CN1031303A Automatic monitoring network for carrier communication |
| 02/22/1989 | CN1003399B 解调器 Demodulator |
| 02/21/1989 | US4807274 Telephone line quality testing system |
| 02/21/1989 | US4807259 Time synchronization method in data transmission system |
| 02/21/1989 | US4807173 Frequency-domain block-adaptive digital filter |
| 02/21/1989 | US4806929 Remote monitor control system |
| 02/15/1989 | EP0303407A2 Crosstalk reduction in unshielded twisted-pair lines |
| 02/15/1989 | EP0303363A2 Echo canceller |
| 02/15/1989 | EP0303101A1 Echo canceller |
| 02/14/1989 | US4805215 Adaptive echo canceller with sparse dynamically positioned taps |
| 02/14/1989 | CA1250036A1 Oversampling echo canceller |
| 02/14/1989 | CA1250035A1 Split-memory echo canceller |
| 02/08/1989 | EP0302502A2 Arrangement for connecting a repeater for a sea cable |
| 02/08/1989 | EP0302162A2 Apparatus for matching unbalanced R.F. baseband signals to balanced signals on a twisted two-wire line |
| 02/07/1989 | US4803648 Echo canceller using an adaptive finite impulse response filter |
| 02/01/1989 | EP0301636A1 Transceiver arrangement for full-duplex data transmission comprising an echo canceller and povision for testing the arrangement |
| 02/01/1989 | EP0301627A1 Digital echo canceller |
| 01/26/1989 | WO1989000722A1 Adaptive noise cancellation in a closed loop control system |
| 01/25/1989 | EP0300427A1 Echo canceller |
| 01/25/1989 | EP0300352A1 Test apparatus for digital echo cancellers |
| 01/25/1989 | EP0300016A1 Device for the remote transmission of signals, particularly video signals. |
| 01/24/1989 | US4800572 Adapter frequency range equalizer for digital radio relay systems |
| 01/24/1989 | US4800517 Word-sliced signal processor |
| 01/24/1989 | US4800363 Method for data transmission via an electric distribution system and transmission system for carrying out the method |
| 01/18/1989 | EP0299648A1 Echo cancellation |
| 01/18/1989 | EP0114855B1 Adaptive filter update normalization |
| 01/17/1989 | US4799238 Differential phase shift keying method for the transmission of data |
| 01/17/1989 | US4799214 Two-wire full duplex frequency division multiplex modem system having echo cancellation means |
| 01/17/1989 | US4799180 Adaptive automatic equalizer |
| 01/17/1989 | US4798982 Active symmetrical balance hybrid circuit |
| 01/17/1989 | US4798969 Power feed system in transmission line between terminals of three-terminal station |
| 01/11/1989 | EP0298621A2 System for measuring and automatically compensating for the distortions of a connection between a telephone apparatus and a central voice processing unit |
| 01/11/1989 | CN2030780U Balance-testing device for programmable communication cable |
| 01/10/1989 | US4797898 Method and apparatus for equalization of data transmission system |
| 01/10/1989 | CA1248590A1 Wide band data transmission over an electricity distribution network |
| 01/03/1989 | US4796296 PCM coder and decoder having function of two-wire/four-wire conversion |
| 01/03/1989 | US4796183 Rotating data transmission device |
| 12/29/1988 | WO1988010528A1 Shorted-coaxial-cable detector for local-area networks |
| 12/29/1988 | DE3719591A1 Method for echo suppression for a hybrid circuit |
| 12/29/1988 | DE3719518A1 Method for commissioning the remote feed of electrical loads and circuit arrangement to carry out the method |
| 12/27/1988 | US4794555 Waveform shaping circuit |
| 12/22/1988 | DE3717886A1 Method for transmitting data |
| 12/21/1988 | EP0295896A2 An apparatus for controlling a switching amplifier |
| 12/21/1988 | CN87103956A Portable single-tube multi-wire speaking protective device |
| 12/20/1988 | US4792964 Adaptive jitter canceller having sinusoidal accentuator and jitter prediction filter |