| Patents for H04B 3 - Line transmission systems (31,523) |
|---|
| 08/12/1981 | EP0033471A1 Circuit arrangement for closing the remote power supply loop of a remote power supply installation |
| 08/11/1981 | US4283770 Signal processor for digital echo canceller |
| 08/06/1981 | WO1981002227A1 Overhead electric line |
| 08/06/1981 | WO1981002226A1 Direct-current electric line |
| 08/05/1981 | EP0033216A2 Improvements in correction processor of self-adaptive filters |
| 08/04/1981 | US4282411 Residual echo suppressor for echo canceller |
| 07/28/1981 | US4281416 Light source system in an optical transmission repeater |
| 07/28/1981 | US4281408 Digital signal processing arrangement for controlling the level of a frequency-division multiplex signal |
| 07/28/1981 | CA1106001A1 Frequency domain automatic equalizer using minimum mean square error correction criteria |
| 07/21/1981 | CA1105629A1 Half echo suppressor for a four-wire telephone line |
| 07/07/1981 | US4277655 Automatic gain repeater |
| 07/07/1981 | US4277645 Multiple variable threshold speech detector |
| 07/07/1981 | CA1104694A1 Method and apparatus for regenerating a modified duobinary signal |
| 07/01/1981 | EP0031140A1 Transistor broad band amplifier incorporating a preamplifier and a final amplifier each with negative feedback |
| 07/01/1981 | EP0031061A2 Blocking filter for appliances with carrier frequency utilisation in low-tension networks |
| 06/30/1981 | US4276450 Method and apparatus for improving telephone hybrid network |
| 06/30/1981 | EP0023223A4 Modified vestigial side band transmission system. |
| 06/24/1981 | EP0030724A2 Method and device for carrying out objective measurements on digital speech transmission systems |
| 06/23/1981 | US4275358 Frequency sensitive amplitude equalization circuit |
| 06/23/1981 | CA1103775A1 Hybrid for two-wire full-duplex transmission of digital signals |
| 06/16/1981 | US4273970 Intermodulation distortion test |
| 06/16/1981 | US4273963 Automatic equalization for digital transmission systems |
| 06/11/1981 | WO1981001636A1 Audio signal processing system using a signal level gain control element |
| 06/10/1981 | EP0030125A1 Low noise amplifier circuit |
| 06/10/1981 | EP0030095A1 Bus transmission system |
| 06/10/1981 | EP0030037A2 Amplitude equalizer, particularly for use in a signal transmission system |
| 06/10/1981 | EP0030006A1 Circuit arrangement for the remote supply of intermediate posts in a telecommunication contrivance with monitoring of the output voltage of at least one supply unit |
| 06/10/1981 | EP0030004A1 Circuit arrangement for the remote supply of intermediate posts in a telecommunication contrivance by means of direct current series supply |
| 06/09/1981 | US4272738 Programmable delay response shape bulk delay extender |
| 06/09/1981 | US4272648 Gain control apparatus for digital telephone line circuits |
| 06/03/1981 | EP0029688A1 Digital data transmission systems |
| 06/02/1981 | US4271525 Adaptive diversity receiver for digital communications |
| 06/02/1981 | US4271503 Automatic control device for a receiver using a pilot |
| 06/02/1981 | US4271478 Method and apparatus for measuring the transmission characteristics in electrical communication systems |
| 06/02/1981 | CA1102424A1 Digital communication system for transmitting digital information between a central station and a number of remote stations |
| 06/02/1981 | CA1102423A1 Apparatus for reducing the susceptibility of line signal repeaters to induced currents |
| 05/27/1981 | EP0029108A1 Method and arrangement for fault location without addressing forming loops in a communication line |
| 05/26/1981 | US4270214 High impedance tap for tapped bus transmission systems |
| 05/26/1981 | US4270206 Transceiver for phase-shift modulated carrier signals |
| 05/20/1981 | EP0028857A1 Device for carrier detection in a modem provided with an echo canceller |
| 05/19/1981 | US4268727 Adaptive digital echo cancellation circuit |
| 05/19/1981 | CA1101491A1 Digital echo canceler for a modem for data transmission by means of modulation of a carrier |
| 05/13/1981 | EP0028550A1 Inverter, and static generator of signals comprising such an inverter |
| 05/12/1981 | CA1101078A1 Discrete fourier transform equalizer and method |
| 05/05/1981 | US4266204 Delay line signal equalizer for magnetic recording signal detection circuits |
| 04/29/1981 | EP0027511A1 Method and circuit arrangement for putting into operation the bilateral remote power supply of intermediate posts of a commucation transmission line |
| 04/28/1981 | US4264959 Testing procedure and circuit for the determination of frequency distortions and group delay time distortion of a test object |
| 04/28/1981 | US4264935 Balanced tapped delay line spectral shaping differentiation circuit for signal detection |
| 04/28/1981 | US4264827 Current mode data or power bus |
| 04/22/1981 | EP0027314A1 Data receiver including means for forming line samples and method of operating such a data receiver |
| 04/21/1981 | US4263671 Sampling clock correction circuit |
| 04/21/1981 | US4263591 Electric transmission system |
| 04/16/1981 | WO1981001089A1 Control of coefficient drift for fractionally spaced equalizers |
| 04/16/1981 | WO1981001088A1 Equalizer for complex data signals |
| 04/14/1981 | US4262360 Method and device for detecting a pseudo-random sequence of carrier phase changes of 0° and 180° in a data receiver |
| 04/14/1981 | US4262263 Variable equalizer |
| 04/14/1981 | CA1099368A1 Electric direct current telegraphy transmitter |
| 04/08/1981 | EP0026624A2 A coherent phase demodulator for power line communication systems |
| 04/08/1981 | EP0026597A1 Data receiver adapted to receive a modulated signal and method of operating such a data receiver |
| 04/07/1981 | US4261051 Time-division-multiplexed exchanger |
| 04/07/1981 | CA1099042A1 Signaling tone transparent echo suppressor |
| 04/01/1981 | EP0026065A1 Improvements in or relating to transversal equalisers |
| 03/31/1981 | US4259642 Repeater feedback circuit |
| 03/24/1981 | US4258340 Amplitude equalizer |
| 03/24/1981 | US4258236 Remote telephone line switching and testing |
| 03/19/1981 | WO1981000798A1 Timing acquisition in voiceband data sets |
| 03/19/1981 | WO1981000797A1 Equalizer sample loading in voiceband data sets |
| 03/10/1981 | US4255812 Signal regenerating apparatus with DC compensation |
| 03/03/1981 | US4254442 Circuit for the protection of telephone lines |
| 03/03/1981 | US4254403 Systems for transmitting information in an alternating current electricity supply system |
| 03/03/1981 | US4254402 Transformer arrangement for coupling a communication signal to a three-phase power line |
| 03/03/1981 | CA1096954A1 Monitoring arrangement for monitoring a change from a normal condition of any one of a plurality of condition sensing devices |
| 03/03/1981 | CA1096953A1 Remote istrumentation apparatus |
| 03/03/1981 | CA1096952A1 Feedbackward distortion compensating circuit |
| 02/24/1981 | US4253186 Method and device for detecting a pseudo-random sequence of two symbols in a data receiver employing double sideband-quadrature carrier modulation |
| 02/24/1981 | US4253184 Phase-jitter compensation using periodic harmonically related components |
| 02/24/1981 | US4253180 Voltage controlled oscillator for a transmission line communications system receiver |
| 02/24/1981 | US4253131 Repeater overload circuit |
| 02/24/1981 | CA1096522A1 Subscriber line-trunk circuit |
| 02/17/1981 | US4251886 Transmission system for the transmission of data pulses |
| 02/17/1981 | US4251881 Centralized automatic gain control circuit |
| 02/17/1981 | US4251783 Variable resonance type amplitude equalizing circuit |
| 02/17/1981 | CA1096005A1 Variable phase shifter for adaptive echo cancellers |
| 02/11/1981 | EP0023605A1 Wireless communication system |
| 02/10/1981 | US4250489 Distribution network communication system having branch connected repeaters |
| 02/10/1981 | US4250472 Undesired signal canceller |
| 02/10/1981 | US4250459 Circuit arrangement for automatic distortion correction of a signal |
| 02/04/1981 | EP0023223A1 Modified vestigial side band transmission system |
| 02/03/1981 | US4249087 Power supply arrangement for a number of functional units distributed along a transmission line |
| 01/28/1981 | EP0023056A1 Arrangement having a non-recursive filter |
| 01/27/1981 | US4247940 Equalizer for complex data signals |
| 01/20/1981 | US4246642 Leaky digital integrator |
| 01/20/1981 | US4246582 Full duplex transceiver comprising hybrid coil and automatic impedance adjustment means |
| 01/13/1981 | US4245345 Timing acquisition in voiceband data sets |
| 01/13/1981 | US4245320 Method and device for measuring the slope of the envelope delay characteristic of a transmission channel and their application to an automatic equalizer selection technique |
| 01/13/1981 | US4245215 Power line signalling system |
| 01/13/1981 | CA1093698A1 Arrangement for simultaneous two-way data transmission over two-wire circuits |
| 01/13/1981 | CA1093644A1 Data receiver with synchronizing sequence detection circuit |
| 01/07/1981 | EP0021317A2 Adaptive filter with TAP coefficient leakage |
| 01/06/1981 | US4244047 Multiplexed carrier transmission through harmonic polluted medium |