| 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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| 02/20/1990 | US4903331 Quadrature detection receiver with separate amplitude and phase control |
| 02/20/1990 | US4903330 Housing structure for paging receiver |
| 02/20/1990 | US4903327 Cellular telephone with transmission-on and radio-on timers |
| 02/20/1990 | US4903326 Detachable battery pack with a built-in broadband antenna |
| 02/20/1990 | US4903325 Portable wireless communication apparatus |
| 02/20/1990 | US4903319 Portable radio telephone having power saver |
| 02/20/1990 | US4903279 Receiver for spread spectrum communication and receiving method for the same |
| 02/20/1990 | US4903257 Digital two-way radio-communication system using single frequency |
| 02/20/1990 | US4903130 Broadcast satellite receiver |
| 02/20/1990 | US4903021 Signal encoding/decoding employing quasi-random sampling |
| 02/15/1990 | DE3827579A1 Transmitter arrangement |
| 02/14/1990 | EP0354707A2 Frequency converter |
| 02/14/1990 | EP0354587A2 Power saving low frequency power amplifier |
| 02/14/1990 | EP0354459A1 Televison receiver |
| 02/14/1990 | EP0354371A2 Semiconductor integrated circuit for a radio |
| 02/14/1990 | EP0354225A1 Process for adapting the frequency band of an oscillating circuit made from a metal-plastic-metal sandwich foil useful as an identification label. |
| 02/14/1990 | CN2052993U Micro consumption remote control receiving delay device |
| 02/13/1990 | US4901350 Closed-loop audio attenuator |
| 02/13/1990 | US4901291 Wrist watch type receiver of fish sonar |
| 02/13/1990 | CA1265878A1 Multiplex information transmission system |
| 02/08/1990 | DE3826821A1 Circuit arrangement for bus monitoring |
| 02/08/1990 | DE3826294A1 Hands-free device for communications systems |
| 02/07/1990 | EP0353227A1 Apparatus for controlling a television receiver or the like |
| 02/07/1990 | CN1039513A Method for increasing the communication capacity of the phone line |
| 02/06/1990 | USH739 Auxiliary antenna interference canceller |
| 02/06/1990 | US4899389 Pulsating noise removal device |
| 02/06/1990 | US4899388 Infrared stereo speaker system |
| 02/06/1990 | US4899384 Table controlled dynamic bit allocation in a variable rate sub-band speech coder |
| 02/06/1990 | US4899370 Remote control apparatus for electronic equipment |
| 02/06/1990 | US4899364 Automatic gain control system |
| 02/06/1990 | US4899217 Communication and energy control system for houses |
| 02/06/1990 | US4899129 Automated appliance and energy distribution control system |
| 02/01/1990 | DE3829884A1 Coupling control device for dictating devices which can be inserted therein |
| 02/01/1990 | DE3825863A1 Method for synchronising a code word with a received spread-spectrum signal |
| 01/31/1990 | EP0352913A2 Pocket data receiver with full page visual display |
| 01/31/1990 | CN2052172U Radio talkback speaker and telemetering receiver |
| 01/31/1990 | CN2052171U Remote-control transmiter |
| 01/31/1990 | CN1006673B Omnidirectional self-adapting array signal processor |
| 01/30/1990 | US4897871 Apparatus for transmitting and/or receiving balanced signals on a two-wire telecommunication line |
| 01/30/1990 | CA1265269A1 Tdm communication system for efficient spectrum utilization |
| 01/30/1990 | CA1265200A1 Communication system |
| 01/24/1990 | EP0351916A2 Stereo receiving circuit |
| 01/24/1990 | EP0351863A2 Exterior structure for cabinet |
| 01/23/1990 | US4896372 Pulse width modulator for AM-RF transmitter |
| 01/23/1990 | US4896370 Control system for microprocessor and software enhanced communications equipment |
| 01/23/1990 | US4896362 System for subband coding of a digital audio signal |
| 01/23/1990 | US4896356 Sub-band coders, decoders and filters |
| 01/23/1990 | US4896152 Telemetry system with a sending station using recursive filter for bandwidth limiting |
| 01/23/1990 | US4896124 Ceramic filter having integral phase shifting network |
| 01/23/1990 | CA1264827A1 Frequency synthesizer |
| 01/23/1990 | CA1264812A1 Spread spectrum communications system |
| 01/17/1990 | EP0351230A2 Radio communication apparatus having an improved signal to noise ratio |
| 01/17/1990 | EP0351008A2 Transmission system for sending two signals simultaneously on the same communications channel |
| 01/17/1990 | CN2051420U Transmitting and recieving device for audio signal transmitted by infrared ray |
| 01/17/1990 | CN1038915A Telescopic aerial having integrative speaker |
| 01/17/1990 | CN1038912A Cable television spread spectrum data transmission |
| 01/17/1990 | CN1038909A Digital deemphasis circuit |
| 01/17/1990 | CN1006517B Receiver for expanded frequency band signal |
| 01/16/1990 | US4894864 Interface circuit |
| 01/16/1990 | US4894862 Signal compression circuit, particularly for a telephone set |
| 01/16/1990 | US4894842 Precorrelation digital spread spectrum receiver |
| 01/16/1990 | US4894841 Digital direct-sequence spread-spectrum modem |
| 01/11/1990 | DE3822848A1 Hand-held housing for a radiotelephone |
| 01/10/1990 | EP0350119A1 Stand-alone utility device with antitheft code |
| 01/10/1990 | CN1038733A Path protection |
| 01/10/1990 | CN1038732A Processor based linked compressor-expander telecommunications system |
| 01/10/1990 | CN1006435B Interface unit |
| 01/09/1990 | US4893350 Interference cancellation system |
| 01/09/1990 | US4893349 FM communication system with improved response to rayleigh-faded received signals |
| 01/09/1990 | US4893347 FM communication system with improved response to Rayleigh-faded companded signals |
| 01/09/1990 | US4893341 Digital receiver operating at sub-nyquist sampling rate |
| 01/09/1990 | US4893317 Digital signals and frequency correction in a digital wireless system |
| 01/09/1990 | US4893308 Method and apparatus for time companding a digital voice signal |
| 01/09/1990 | US4893128 Troposcatter diversity sidelobe jamming suppressor |
| 01/09/1990 | US4893126 Integrated millimeter-wave transceiver |
| 01/09/1990 | US4893082 Noise suppression in magnetic resonance imaging |
| 01/09/1990 | US4892486 Portable communications device adaptor |
| 01/09/1990 | CA1264356A1 Hands-free control system for a radiotelephone |
| 01/03/1990 | EP0349237A2 A stereo multiplex demodulator |
| 01/03/1990 | EP0348877A2 Wristwatch receiver architecture |
| 01/03/1990 | EP0348774A2 System consisting of at least two remotely controlled entertainment electronic devices |
| 01/03/1990 | EP0348677A2 Telescopic aerial with integrated microphone |
| 01/03/1990 | CN2050667U Miniature radio or hearing aid being suspended in or linked with glasses frame |
| 01/02/1990 | US4891840 Multi-channel signal transmission |
| 01/02/1990 | US4891824 Muting control circuit |
| 01/02/1990 | US4891708 Voltage superposing circuit for an electronic tuner |
| 12/28/1989 | WO1989012945A1 Portable radiotelephone with control switch disabling |
| 12/28/1989 | DE3821356A1 Bus system for the field of entertainment electronics |
| 12/28/1989 | DE3821355A1 Selection and control system |
| 12/27/1989 | EP0348187A2 Protective casing for a hand-held portable radio telephone |
| 12/27/1989 | EP0348167A2 Digital communicating method and apparatus |
| 12/27/1989 | EP0347761A2 Local oscillator feedthru cancellation circuit and method therefor |
| 12/27/1989 | EP0347569A2 Power control arrangement |
| 12/27/1989 | EP0261127B1 Tdm communication system for efficient spectrum utilization |
| 12/27/1989 | EP0116577B1 Data signalling system |
| 12/27/1989 | CN2050241U Time, calling, anti-robber alarm reception device |
| 12/27/1989 | CN1006269B Multi-level power amplifying circuitry for portable radio transoeivers |
| 12/27/1989 | CA1264067A1 Multi-level power amplifying circuitry for portable radio transceivers |
| 12/27/1989 | CA1264066A1 Remanent subcarrier component suppressing device for balanced modulator |
| 12/26/1989 | US4890325 Speech coding transmission equipment |