| 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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| 06/01/1989 | WO1989005067A1 Transponder |
| 06/01/1989 | WO1989005066A1 Moldable/foldable radio housing |
| 05/31/1989 | EP0317623A1 Adaptive frequency modulation |
| 05/31/1989 | EP0187778B1 Adaptive hybrid circuit |
| 05/31/1989 | CN2038690U Audio signal convertor |
| 05/30/1989 | US4835791 Single sideband signal generator |
| 05/30/1989 | US4835773 Duplicated equipment |
| 05/30/1989 | US4835531 Automobile remote-control system |
| 05/30/1989 | US4835517 Modem for pseudo noise communication on A.C. lines |
| 05/24/1989 | EP0317360A2 Tuner for receiving television signal in frequency division multiplex system and television signal in time division multiplex system |
| 05/24/1989 | EP0317007A1 Remote control system using a wake up signal |
| 05/24/1989 | EP0316879A2 Radio with broad band automatic gain control circuit |
| 05/24/1989 | EP0316611A2 VHF radio transmission installation using at least two transmitters with a different frequency |
| 05/24/1989 | EP0316368A1 Identification system. |
| 05/24/1989 | DE3738828A1 Hand-held duplex transceiver |
| 05/24/1989 | DE3738389A1 Mobile radio system with holder for a handset rest |
| 05/24/1989 | CN1033136A Method for suppressing carrier-frequency by keyed frequency-multiplication or frequency-mixing |
| 05/24/1989 | CN1004322B Synchronising method and its system for digital communication machine |
| 05/24/1989 | CN1004320B Shf receiver |
| 05/23/1989 | US4833725 Unintentional radio transmission detection system |
| 05/23/1989 | US4833715 FM stereo receiver |
| 05/23/1989 | US4833694 Signal receiver |
| 05/23/1989 | US4833543 Image processing system and phaselocked loop used therein |
| 05/23/1989 | CA1254623A2 Individual simulcast transmitter remote control system |
| 05/23/1989 | CA1254621A1 Channel switching system |
| 05/18/1989 | WO1989004569A1 Communications apparatus |
| 05/18/1989 | WO1989004565A1 Microwave diode tuning circuit |
| 05/17/1989 | EP0315940A2 Apparatus and method for phase noise and post tuning drift cancellation |
| 05/17/1989 | EP0315686A1 Dual port fm demodulation in phase locked receivers |
| 05/17/1989 | CN2037903U Multifunctional radio and its controllable power socket box |
| 05/16/1989 | US4831624 Error detection method for sub-band coding |
| 05/16/1989 | US4831617 Data communication system having means for switching between main and stand-by apparatuses |
| 05/11/1989 | DE3737049A1 Radio device, particularly radio telephone |
| 05/10/1989 | EP0314995A2 RDS receiver |
| 05/09/1989 | US4829595 Automobile electronic device |
| 05/09/1989 | US4829594 Adaptive correction of DC error transients |
| 05/09/1989 | US4829591 Portable radio |
| 05/09/1989 | US4829590 Adaptive noise abatement system |
| 05/09/1989 | US4829588 Automatic retransmission with pilot tone |
| 05/09/1989 | US4829540 Secure communication system for multiple remote units |
| 05/09/1989 | US4829466 Paging device with modifiable operational characteristics |
| 05/09/1989 | US4829224 Battery pack for cellular telephone |
| 05/09/1989 | US4828153 Detachable belt clip assembly |
| 05/09/1989 | CA1253927A1 Signal generator |
| 05/05/1989 | WO1989004095A1 Demodulation method |
| 05/05/1989 | WO1989004093A1 Passive universal communicator |
| 05/03/1989 | EP0314177A2 Transmitter for remote control system and method of remotely controlling a plurality of operations on a plurality of electronic devices |
| 05/03/1989 | DE3735374A1 Digital correlator circuit |
| 05/03/1989 | CN2037124U Concealed microphone communication device |
| 05/02/1989 | US4827490 Method of synchronizing two binary trains |
| 05/02/1989 | CA1253601A1 Receiving digital sound/data information |
| 05/02/1989 | CA1253572A1 Device for demodulating a spread spectrum signal |
| 04/27/1989 | DE3733786A1 Digital adaptive transformation coding methods |
| 04/27/1989 | DE3733772A1 Multi-signal processor system |
| 04/26/1989 | EP0313121A1 Method and device for tuning a resonant circuit |
| 04/26/1989 | EP0312589A1 Antenna coupler |
| 04/26/1989 | CN1032609A Synchronization method and relevent system for digital communication machines |
| 04/25/1989 | US4825451 Technique for transmission of voice communications and apparatus useful therein |
| 04/25/1989 | US4825448 Subscriber unit for wireless digital telephone system |
| 04/25/1989 | US4825200 Reconfigurable remote control transmitter |
| 04/25/1989 | CA1253255A1 System for simultaneously coding and decoding a plurality of signals |
| 04/25/1989 | CA1253212A1 Mobile station and a mobile radio communication network in which electric power is saved without reduction of an activity ratio of radio communication channels |
| 04/20/1989 | WO1989003627A1 Intelligent alarm apparatus with interfacing to a telephone network |
| 04/20/1989 | WO1989003574A1 Digital adaptive transform coding process |
| 04/20/1989 | WO1989003325A1 Anti-theft system for a radio receiver used particularly in a motor vehicle |
| 04/19/1989 | EP0312456A1 Anti-theft device for a motor vehicle radio receiver or the like |
| 04/19/1989 | CN2036315U Telecontrol electric power source plug board |
| 04/18/1989 | US4823397 Transceiver with moisture resistant cover for thumbwheels and the like |
| 04/18/1989 | US4823392 Controlling the dynamic range of audio signals |
| 04/18/1989 | US4823098 Monolithic ceramic filter with bandstop function |
| 04/18/1989 | CA1252822A1 Spread spectrum wireless pbx |
| 04/13/1989 | DE3832887A1 Schaltungsanordnung fuer fernseh-/ rundfunkempfaenger und/oder videobandaufzeichnungsgeraete Circuit arrangement for tV / rundfunkempfaenger and / or video tape recorders |
| 04/12/1989 | EP0311494A1 Method and apparatus for digital transmission of speech between mobile stations |
| 04/12/1989 | EP0310796A1 FM-signal demodulation method |
| 04/12/1989 | EP0310632A1 Cross-flow filtration device and method of making. |
| 04/12/1989 | EP0186684B1 Radiotelephone transmission power control |
| 04/12/1989 | CN2035943U Transistor emission and answer apparatus |
| 04/12/1989 | CN1003892B Tape recorder equipped with radio set |
| 04/11/1989 | US4821322 FM multiplex decoding |
| 04/11/1989 | US4821309 Method of alarm to prevent vehicle thefts |
| 04/11/1989 | US4821260 Transmission system |
| 04/11/1989 | CA1252513A1 Multipath canceller for cancelling a distortion caused to a radio frequency pulse by multipath transmission |
| 04/06/1989 | WO1989003141A1 Improved noise suppression system |
| 04/06/1989 | WO1989003140A1 Process for transmitting audio signals |
| 04/06/1989 | DE3730739A1 Housing consisting of a housing upper part and a housing lower part |
| 04/05/1989 | EP0310379A2 Radio telephone apparatus |
| 04/05/1989 | EP0310325A2 Control device in transceiver |
| 04/05/1989 | EP0310318A2 Radio telephone apparatus |
| 04/05/1989 | EP0310284A2 Automobile telephone device |
| 04/05/1989 | EP0310110A2 (1+N) hitless channel switching system |
| 04/05/1989 | EP0309974A1 Method for transmitting an audio signal |
| 04/05/1989 | EP0309878A2 Method and/or device for programming audio or video apparatuses |
| 04/05/1989 | EP0309451A1 Device to protect against interference signals. |
| 04/05/1989 | CN1003834B Directly mixing synchronous am-receiver |
| 04/04/1989 | US4819272 Intermittently driven transmitter |
| 04/04/1989 | US4819268 Transmitter having means for controlling undesired out-of-band radiation |
| 04/04/1989 | US4819199 Extrema coder employing noisy limiting amplifier stages |
| 04/04/1989 | CA1252151A1 Method of reducing the effect of narrowband jammers in radio communication between two stations |
| 03/29/1989 | EP0309039A2 Integrated millimetre-wave transceiver |
| 03/29/1989 | EP0308959A2 Receiver capable of improving signal-to-noise ratio in reproducing digital signals |