| 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) |
|---|
| 03/24/1987 | US4652907 Apparatus for adaptively controlling a video signal recursive filter |
| 03/24/1987 | US4652857 Method and apparatus for transmitting wide-bandwidth frequency signals from mines and other power restricted environments |
| 03/24/1987 | CA1219648A1 Adaptive echo canceller |
| 03/24/1987 | CA1219640A1 Circuit arrangement comprising a voltage-controlled oscillator operable with different sensitivities |
| 03/24/1987 | CA1219639A1 Apparatus and method for reducing telephone channel power loading |
| 03/18/1987 | EP0214806A2 Portable radio |
| 03/18/1987 | EP0214497A2 Line protection switch equipment |
| 03/18/1987 | EP0214472A2 Control circuit for use with electronic attenuators and method for providing a control signal proportional to absolute temperature |
| 03/18/1987 | CN85106559A Portable communications terminal |
| 03/17/1987 | US4651344 VHF-UHF mixer having a balun |
| 03/17/1987 | US4651327 Decoder for spectrum diffusion signals |
| 03/17/1987 | US4650928 Signal transmitting and/or receiving apparatus |
| 03/17/1987 | US4650344 Radio controlled timepiece |
| 03/17/1987 | CA1219327A1 Cooling system for communications equipment |
| 03/12/1987 | WO1987001542A1 Capacity expander for telephone line |
| 03/12/1987 | WO1987001531A1 Digital radio frequency receiver |
| 03/11/1987 | EP0213801A2 Radio receiver for carrying out self diagnosis without interference |
| 03/10/1987 | US4649569 Transceiver with auto frequency sense |
| 03/10/1987 | US4649549 Apparatus for synchronizing linear PN sequences |
| 03/10/1987 | US4649538 Radio paging device with improved test modes |
| 03/04/1987 | EP0211995A1 Method and arrangement for detecting the presence of a training signal in a modem receiver |
| 03/04/1987 | EP0211961A1 System for discriminating pulses such as response signals in a transponder |
| 03/03/1987 | US4648130 Radio-thermal headband |
| 03/03/1987 | US4648127 Noise detector |
| 03/03/1987 | US4648126 Noise detector |
| 03/03/1987 | US4648125 Portable radio transceiver |
| 03/03/1987 | US4648099 Digital minimum shift keyed modulator |
| 03/03/1987 | US4648098 Signal generator and correlator for receiving minimum shift keyed data |
| 03/03/1987 | US4647973 Switch apparatus for a video interconnection system |
| 03/03/1987 | CA1218721A1 Noise reduction circuit and method |
| 02/26/1987 | WO1987001254A1 Multiplexed digital packet telephone system |
| 02/25/1987 | EP0211554A2 Digital bus control system |
| 02/25/1987 | CN85105847A Shortwave supernarrow band radio data transmission apparatus |
| 02/24/1987 | US4646358 Signaling arrangement for two-way radio communication |
| 02/24/1987 | US4646344 Mobile radio set |
| 02/24/1987 | US4646286 Communications system with protection switching and channel identities |
| 02/24/1987 | CA1218462A1 Compression and expansion of digitized voice signals |
| 02/24/1987 | CA1218425A1 Carrier detection circuit |
| 02/24/1987 | CA1218416A1 R.f. circuit arrangement |
| 02/19/1987 | DE3627194A1 Portable radio-frequency transmitter for keyless access systems, particularly on vehicles |
| 02/19/1987 | DE3529078A1 Transmitter amplifier with selective noise feedback |
| 02/19/1987 | DE2036112C1 Frequency-hopping radio communication system - uses control for coupling field connecting transmitter according to frequency required for speech direction of station |
| 02/18/1987 | CN86104232A Signal receiver |
| 02/18/1987 | CN85103366A Clock signal device of angle modulated carrier restoration |
| 02/17/1987 | US4644560 Intranetwork code division multiple access communication system |
| 02/17/1987 | US4644526 Full duplex frequency division multiplex communication system |
| 02/17/1987 | US4644524 Simultaneous communication system using time delays |
| 02/17/1987 | US4644523 System for improving signal-to-noise ratio in a direct sequence spread spectrum signal receiver |
| 02/17/1987 | US4644301 Redundancy system and switching network |
| 02/17/1987 | US4644105 Mobile telephone controller switch |
| 02/17/1987 | CA1218157A1 Analog and digital signal apparatus |
| 02/17/1987 | CA1218113A1 Microwave communications system |
| 02/12/1987 | WO1987000994A1 Nationwide radio paging system |
| 02/12/1987 | DE3527554A1 System for operating a short-wave transmitter according to the frequency hopping method |
| 02/10/1987 | US4642675 Superheterodyne receiver |
| 02/10/1987 | US4642583 Noise reduction in companding arrangements |
| 02/10/1987 | CA1217844A Duplex digital span transmission circuit arrangement |
| 02/10/1987 | CA1217821A Paging receiver having a plurality of test modes |
| 02/10/1987 | CA1217820A Low power indicating circuit for a radio transmitter |
| 02/05/1987 | DE3526175A1 Input changeover switch for a satellite receiving circuit |
| 02/04/1987 | EP0210746A2 Impedance matching arrangement |
| 02/04/1987 | EP0210688A2 Signal transmission system and a transmitter and a receiver for use in the system |
| 02/03/1987 | US4641370 Housing assembly for portable radio apparatus with one-piece baseplate and battery container |
| 02/03/1987 | US4641368 Radio frequency receiver |
| 02/03/1987 | US4641367 Receiver for FM signals with transmitter status code storage |
| 02/03/1987 | US4641366 Portable radio communication apparatus comprising an antenna member for a broad-band signal |
| 02/03/1987 | US4641365 Overpower protection for a radio frequency transceiver |
| 02/03/1987 | US4641339 Variable bandwidth handsfree telephone using switched capacitor filtering |
| 02/03/1987 | US4641322 System for carrying out spread spectrum communication through an electric power line |
| 02/03/1987 | US4641317 Spread spectrum radio transmission system |
| 02/03/1987 | US4641293 Cassette tape player combined with a radio receiver which has multiple push buttons such that the stop push button can be used to turn off either the cassette tape player or the radio receiver |
| 02/03/1987 | US4641126 Multiple-mode electrical power and communications interface |
| 01/31/1987 | CN85102330A 接收机 Receiver |
| 01/31/1987 | CN85101794A Duplex speech transmitting method and its system |
| 01/28/1987 | EP0210093A1 Method and device for monitoring the transmission of signals of a differential protection relay |
| 01/28/1987 | EP0209946A2 Devices for generating a mark of non-connected transmission channels of a digital transmission system |
| 01/28/1987 | EP0209640A2 Circuit for bandswitching a voltage controlled oscillator |
| 01/28/1987 | EP0209527A1 Method of communications between register-modelled radio devices. |
| 01/28/1987 | CN85105744A 无线电接收机 Radio receiver |
| 01/28/1987 | CN85105642A Method and apparatus for automatically identifying a responding modem in a multi-drop network |
| 01/27/1987 | US4639932 Clock rate spread spectrum |
| 01/27/1987 | CA1217269A1 Tv program timer apparatus and method |
| 01/27/1987 | CA1217234A1 Data signalling system |
| 01/24/1987 | CN85102319A Device for receiving high-frequency signal |
| 01/22/1987 | EP0188504A4 Adaptive antenna array. |
| 01/21/1987 | EP0209182A2 Radio transmission system |
| 01/21/1987 | EP0208872A1 Method for the transmission of digital data |
| 01/21/1987 | EP0208817A1 Communications system |
| 01/21/1987 | CN86104754A 数字控制总线系统 Digital control bus system |
| 01/21/1987 | CN86104008A Circuit arrangements for modifying dynamic range using action substitution and superposition techniques |
| 01/20/1987 | US4638494 System for the acquisition of code signals |
| 01/20/1987 | US4638493 Adaptive interference rejection for improved frequency hop detection |
| 01/20/1987 | US4638264 Voltage controlled oscillator with series connected resonance element and switched capacitance |
| 01/17/1987 | CN85101923A Frequency synthesising type multichannel radio apparatus |
| 01/17/1987 | CN85101406A 遥控传送器 Remote Transmitter |
| 01/17/1987 | CN85101327A Data collecting apparatus of multi-point connection type |
| 01/14/1987 | EP0208530A2 Squelch detecting circuit with squelch start determining means |
| 01/14/1987 | EP0208470A2 Signal receiver with tuning circuits |
| 01/14/1987 | EP0208270A2 Microwave relay station having a common standbby channel for signals of different types of modulation |
| 01/14/1987 | EP0208182A1 Broadband transmitter for short electromagnetic waves |