| 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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| 07/24/1990 | US4943976 Spread spectrum communication system |
| 07/24/1990 | US4943975 Spread spectrum communication receiver |
| 07/24/1990 | US4943974 Detection of burst signal transmissions |
| 07/24/1990 | US4943973 Spread-spectrum identification signal for communications system |
| 07/24/1990 | CA2008131A1 Adaptive predistortion circuit |
| 07/19/1990 | DE4004202A1 Radio receiver with avoid recording facility - stores last received audio signal |
| 07/18/1990 | EP0378231A2 Frequency synthesizer |
| 07/18/1990 | EP0377965A2 Combined deemphasis circuit and noise blanker |
| 07/18/1990 | EP0377687A1 Spectrally efficient method for communicating an information signal |
| 07/18/1990 | EP0377581A1 Analog/digital data storage system. |
| 07/18/1990 | EP0222854B1 Telecontrol unit for leisure electronic apparatuses |
| 07/18/1990 | EP0152430B1 Apparatus and methods for coding, decoding, analyzing and synthesizing a signal |
| 07/18/1990 | CN1008870B Portable communications terminal |
| 07/17/1990 | US4942622 Mobile radio-receiver system with improved reproduction characteristics of reception signal having noise superimposed thereon |
| 07/17/1990 | US4942607 Method of transmitting an audio signal |
| 07/17/1990 | US4942590 Optimum clock generator in data communication |
| 07/17/1990 | US4942589 Channelized binary-level hop rate detector |
| 07/17/1990 | US4942375 Variable attenuation device intended to be inserted between a transmitter circuit and load circuit |
| 07/12/1990 | DE3900120A1 Car radio RF-components or LW, MW, SW, VHF mounted on individual cassettes |
| 07/11/1990 | EP0377509A2 Efficient digital frequency division multiplexed signal receiver |
| 07/10/1990 | US4941198 Communications repeater monitoring system |
| 07/10/1990 | US4941174 Digital radio with security system for selectively enabling software controlled options |
| 07/10/1990 | US4941165 Hot cut procedure for telecommunications network |
| 07/10/1990 | US4941152 Signal coding process and system for implementing said process |
| 07/10/1990 | US4941150 Spread spectrum communication system |
| 07/10/1990 | US4940414 Antitheft car audio set with removable control box |
| 07/10/1990 | US4940245 Arrow/wounded animal tracking device |
| 07/04/1990 | EP0376933A2 Digital to analog decoder |
| 07/04/1990 | EP0376553A2 Perceptual coding of audio signals |
| 07/04/1990 | EP0376510A2 Automotive audio system |
| 07/04/1990 | CN1043593A Double ring outomatic power level control circuit for transmitter |
| 07/04/1990 | CN1008677B Direct hybrid synchrodyne receiver |
| 07/03/1990 | US4939792 Moldable/foldable radio housing |
| 07/03/1990 | US4939791 Diversity radio receiver for use with multiple antenna, particularly car radio |
| 07/03/1990 | US4939788 Circuit arrangement for indicating electric field strength |
| 07/03/1990 | US4939786 Adaptive thermal protection for a power amplifier by remote sense |
| 07/03/1990 | US4939746 Trunked radio repeater system |
| 07/03/1990 | US4939736 Protection against loss or corruption of data upon switchover of a replicated system |
| 06/28/1990 | WO1990007237A1 Improvements to rds radio system |
| 06/28/1990 | DE3842982A1 Circuit arrangement for creating de-emphasis |
| 06/27/1990 | EP0375128A2 An automotive sound system |
| 06/27/1990 | EP0375067A1 Power economising in multiple user radio systems |
| 06/27/1990 | EP0375052A2 Communication device |
| 06/27/1990 | EP0375034A2 Oscillator for supplying a mixer stage in a tuner |
| 06/27/1990 | EP0374882A2 A hot standby transmitter switching system |
| 06/27/1990 | EP0374473A2 Battery-operated apparatus for reproducing electroacoustic signals, easily carried by the user |
| 06/27/1990 | EP0374374A2 Method and apparatus for reducing the practical bandwidth of a band-limited signal by coding said signal, and method and apparatus for decoding said band-limited signal |
| 06/27/1990 | EP0374326A1 Audio noise gates |
| 06/26/1990 | US4937866 System for decoding transmitted scrambled signals |
| 06/26/1990 | US4936037 Pistol with concealed radio transmitter |
| 06/20/1990 | EP0373760A2 FM channel separation adjustment |
| 06/20/1990 | EP0373387A1 Input unit for an information system in a motor vehicle |
| 06/20/1990 | CN2058545U Push-button station changing radio set capable of presetting station |
| 06/19/1990 | US4935963 Method and apparatus for processing speech signals |
| 06/19/1990 | US4935940 Interference-proof reception of radio signals using frequency hopping techniques |
| 06/19/1990 | US4935924 Signal distribution network |
| 06/19/1990 | US4935745 Card-type radio receiver having slot antenna integrated with housing thereof |
| 06/19/1990 | CA1270529A1 System for automatically tuning the antenna of a miniature portable communications device |
| 06/14/1990 | WO1990006636A1 Two-way radio with voice storage |
| 06/14/1990 | WO1990006634A1 Power conservation method and apparatus for a portion of a predetermined signal |
| 06/14/1990 | WO1990006633A1 Micropowered rf data modules |
| 06/14/1990 | WO1990006632A1 Data compression |
| 06/14/1990 | WO1990006605A1 Portable communications device adaptor |
| 06/13/1990 | EP0372970A1 Data compression |
| 06/13/1990 | EP0372965A2 A two-piece radio telephone |
| 06/13/1990 | EP0372601A1 Coder for incorporating extra information in a digital audio signal having a predetermined format, decoder for extracting such extra information from a digital signal, device for recording a digital signal on a record carrier, comprising such a coder, and record carrier obtained by means of such a device |
| 06/13/1990 | EP0372430A2 Automatic antenna tuning |
| 06/13/1990 | EP0372369A2 Circuit arrangement for suppressing narrow band noise signals |
| 06/13/1990 | DE3940656A1 TV receiver with free movement about two axes |
| 06/13/1990 | DE3841675A1 Battery-operated device which can easily be attached to the body of a user to reproduce electro-acoustic signals |
| 06/13/1990 | CN2058288U Transmitter and receiver for powerline carrier broadcasting |
| 06/13/1990 | CN2058287U Eight-function pocket fan radio |
| 06/13/1990 | CN1043054A Power conservation method and apparatus for portion of predetermined signal |
| 06/13/1990 | CN1043051A 自适应扫描方法 Adaptive scanning method |
| 06/12/1990 | US4933988 Audio receiver and detachable battery pack |
| 06/12/1990 | US4933986 Gain/phase compensation for linear amplifier feedback loop |
| 06/12/1990 | US4933974 Switched capacitor pilot phase and magnitude detector |
| 06/12/1990 | US4933972 Stereo multiplex demodulator |
| 06/12/1990 | US4933963 Radio telephone apparatus |
| 06/12/1990 | US4933954 Device for recombination of a message transmitted by a frequency hopping transmitter |
| 06/12/1990 | US4933953 Initial synchronization in spread spectrum receiver |
| 06/12/1990 | US4933952 Asynchronous digital correlator and demodulators including a correlator of this type |
| 06/07/1990 | DE3840707A1 Control circuit for a broadcast receiver |
| 06/07/1990 | CA2004794A1 Data compression |
| 06/06/1990 | EP0371749A2 Audio/video system for television receiver, video cassette recorder, and so forth |
| 06/06/1990 | EP0371719A2 Apparatus control system using on-screen display |
| 06/06/1990 | EP0371433A2 Demodulator with multiple interference cancellers responsive to correlations between undesired signals and error signals |
| 06/06/1990 | EP0371035A1 Method for error correction in digitally encoded speech |
| 06/06/1990 | EP0371032A1 Protection of energy information in sub-band coding |
| 06/06/1990 | CN2058044U Multiple frequency signal receiver |
| 06/05/1990 | US4932073 Transmitter having PLL circuit |
| 06/05/1990 | US4932072 Mobile station equipment for a mobile radio telephone system |
| 06/05/1990 | US4932071 Aircraft voice communication anti-blocking device |
| 06/05/1990 | US4932058 Pilot cancellation circuit |
| 06/05/1990 | US4932039 Pulse interference canceler of high power out-of-band pulse interference signals |
| 06/05/1990 | US4932036 Spread spectrum squaring loop with invalid phase measurement rejection |
| 06/05/1990 | US4931807 Non-stationary antenna with sleeve and resonant circuit |
| 05/31/1990 | WO1990006020A1 Gallium arsenide antenna switch |
| 05/30/1990 | EP0370797A2 Radio receiver |
| 05/30/1990 | EP0370759A2 Adapter for mounting a portable telephone on a vehicle |