| Patents for H04B 1 - Details of transmission systems, not covered by a single one of groups; Details of transmission systems not characterised by the medium used for transmission (188,568) |
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| 08/18/1987 | US4688224 Method of and device for correcting burst errors on low bit-rate coded speech signals transmitted on radio-communication channels |
| 08/18/1987 | CA1225739A1 Non-linear emphasis circuit |
| 08/18/1987 | CA1225702A2 Radio paging method of arranging message information with reference to a key code and a base station and a paper receiver for use in the method |
| 08/12/1987 | EP0231866A2 Data terminal |
| 08/12/1987 | EP0231659A2 Remote control systems and commanders |
| 08/12/1987 | EP0231422A2 Microwave transmitter/receiver apparatus |
| 08/12/1987 | EP0231291A1 Electronic surveillance system and transceiver unit therefor. |
| 08/12/1987 | EP0231259A1 Nationwide radio paging system. |
| 08/11/1987 | US4686708 Antenna circuit |
| 08/11/1987 | US4686707 Program identifier signal receiver |
| 08/11/1987 | US4686675 Channel switching system |
| 08/05/1987 | EP0230923A2 Spread spectrum signals receiver |
| 08/05/1987 | EP0230642A2 Tool identification system |
| 08/04/1987 | US4685150 Tuning of a resonant circuit in a communications receiver |
| 08/04/1987 | US4685115 Apparatus for transmitting digital signals |
| 08/04/1987 | US4685099 Method and apparatus for duplex communications |
| 08/04/1987 | US4684941 Method of communications between register-modelled radio devices |
| 08/04/1987 | US4684870 Transceiver battery charging apparatus and method |
| 08/04/1987 | CA1225124A1 Adaptive line hybrids |
| 08/04/1987 | CA1225122A1 Apparatus for controlling transmission output power |
| 07/30/1987 | WO1987004578A1 Noise-removing device |
| 07/29/1987 | EP0230338A2 Image processing system |
| 07/29/1987 | EP0230001A1 Method of and device for speech signal coding and decoding by subband analysis and vector quantization with dynamic bit allocation |
| 07/28/1987 | US4683566 Digital radio communication system |
| 07/28/1987 | US4683440 High-frequency amplifier device |
| 07/28/1987 | CA1224849A1 Communication receiving unit for the suppression of noise and interference signals |
| 07/28/1987 | CA1224848A1 Self-calibrating signal strength detector |
| 07/23/1987 | EP0151616A4 Control signalling arrangement for a digital transmission system. |
| 07/22/1987 | EP0229524A1 Duplex frequency division multiplex modem system with echo cancellation |
| 07/22/1987 | EP0229324A1 Radio apparatus with a mains supply plug |
| 07/21/1987 | US4682368 Mobile radio data communication system using a speech recognition technique |
| 07/21/1987 | US4682363 Amphibious personal audio system |
| 07/21/1987 | US4682356 Apparatus for transmitting and/or receiving balanced signals on a two-wire telecommunication line |
| 07/21/1987 | US4682350 Equipment for wireless telephone transmission |
| 07/21/1987 | US4682343 Processing circuit with asymmetry corrector and convolutional encoder for digital data |
| 07/21/1987 | US4682045 Noise eliminating signal compensation circuit |
| 07/21/1987 | CA1224530A2 Receiver systems for eliminating self-quieting spurious responses |
| 07/21/1987 | CA1224529A1 Shf receiver |
| 07/21/1987 | CA1224527A1 Remote control system comprising a control member comprising a display field and position sensing means which are coupled thereto |
| 07/16/1987 | WO1987004317A1 Portable radio transceiver housing structurally supported by an integral battery |
| 07/16/1987 | WO1987004307A1 Dual band antenna permitting connectorless antenna coupler |
| 07/16/1987 | WO1987004304A1 Variable capacitance circuit |
| 07/15/1987 | EP0228786A2 Radio signal interference cancellation system |
| 07/15/1987 | CN86107728A Improvements to pin diode attenuators |
| 07/14/1987 | US4680795 Dual purpose variable Q filter |
| 07/14/1987 | US4680793 Noise eliminating circuit |
| 07/14/1987 | US4680792 Demodulator comprising an indicator circuit for use in common to cancellation of a pilot signal and an indication of a reception state |
| 07/14/1987 | US4680776 Protection switching system for carrier transmission line |
| 07/14/1987 | US4680749 Duplex radio transceiver having improved data/tone and audio modulation architecture |
| 07/14/1987 | US4680676 Portable radio housing with logic and RF shielding |
| 07/14/1987 | US4680431 Data network interface module with circuitry for disconnecting a module that has lost supply voltage |
| 07/14/1987 | CA1224294A1 Noise reduction in companding arrangements |
| 07/07/1987 | US4679247 FM receiver |
| 07/07/1987 | US4679244 Method of transmitting terminating call signals within a restricted duration and a base station and a portable unit for use in the same |
| 07/07/1987 | US4679233 Microphone |
| 07/07/1987 | US4679227 Ensemble modem structure for imperfect transmission media |
| 07/07/1987 | US4679225 Signal transmission apparatus for a multiple channel system and method for using the same |
| 07/07/1987 | US4679207 Single channel tracking for frequency hopping communication systems |
| 07/07/1987 | CA1223938A1 Light detecting circuit |
| 07/01/1987 | EP0226801A2 Optical repeater and regulated current feeding system for the same |
| 06/30/1987 | US4677692 Frequency conversion apparatus |
| 06/30/1987 | US4677691 Microwave receiver |
| 06/30/1987 | US4677689 Circuit arrangement for an apparatus with a picture and/or sound channel |
| 06/30/1987 | US4677688 Radio transceiver including an antenna switching circuit |
| 06/30/1987 | US4677671 Method and device for coding a voice signal |
| 06/30/1987 | US4677666 Adaptive line hybrids |
| 06/30/1987 | US4677654 Carrying case for cellular telephone unit |
| 06/30/1987 | US4677645 Audio signal transmission system having noise reduction means |
| 06/30/1987 | US4677644 Method and apparatus for remote signalling by substituting a message for the data conveyed by a digital transmission link |
| 06/30/1987 | US4677617 Rapid frequency-hopping time synchronization |
| 06/30/1987 | US4676248 Circuit for controlling a receiver in an implanted device |
| 06/25/1987 | DE3545115A1 Apparatus unit, especially for telecommunications technology |
| 06/25/1987 | DE3543907A1 Device for noise suppression in the transmission of audio-frequency signals |
| 06/23/1987 | US4675839 Receiver for a spread spectrum communication system having a time-multiplexed convolver |
| 06/23/1987 | CA1223305A1 Noise blanking circuit and method |
| 06/17/1987 | CN85109151A Radio set within auditory canal |
| 06/16/1987 | US4674121 Circuit for detecting the level of noise in FM signal for use in AM/FM receiver |
| 06/16/1987 | US4674111 Method and apparatus for automatic dialing in mobile radio telephone systems |
| 06/16/1987 | US4674103 Method and arrangement for detecting the presence of a training signal in a modem receiver |
| 06/16/1987 | US4673936 Rescue transmitter apparatus |
| 06/16/1987 | US4673896 Microwave transmitting and receiving arrangements |
| 06/16/1987 | US4673892 Phase locked loop frequency synthesizer with battery saving circuit |
| 06/16/1987 | US4673861 Battery charger/remote control for portable radio devices |
| 06/16/1987 | EP0225644A2 Power supply switch circuit for use in a transceiver or the like |
| 06/16/1987 | EP0225643A2 Channel switching system |
| 06/16/1987 | EP0207964A4 Broadcast stereo companding system and apparatus. |
| 06/16/1987 | CA1223063A1 Receiver for rf-signals comprising a pair of parallel signal paths |
| 06/10/1987 | EP0224626A1 Multi-signal processor synchronized system |
| 06/10/1987 | CN86107133A Multi-level power amplifying circuitry for portable radio transceivers |
| 06/09/1987 | US4672686 High frequency antenna tuning device |
| 06/09/1987 | US4672685 Dual band antenna having separate matched inputs for each band |
| 06/09/1987 | US4672670 Apparatus and methods for coding, decoding, analyzing and synthesizing a signal |
| 06/09/1987 | US4672658 Spread spectrum wireless PBX |
| 06/09/1987 | US4672641 Surface acoustic wave device for data rate reduction |
| 06/09/1987 | US4672633 Data transmission system |
| 06/09/1987 | US4672629 Receiver for bandspread signals |
| 06/09/1987 | US4672605 Data and voice communications system |
| 06/09/1987 | US4672452 Device for the automatic precorrection of non-linearities in a power amplification chain for a television transmitter |
| 06/04/1987 | WO1987003440A1 Interface circuit |
| 06/04/1987 | DE3641110A1 Tuning circuit |