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