| 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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| 04/05/1990 | CA2000167A1 Tuner-demodulator device |
| 04/04/1990 | EP0361801A2 A microwave semiconductor switch |
| 04/04/1990 | EP0361608A1 Adaptive pre-distortion circuit |
| 04/04/1990 | EP0361350A2 Mobile telephone station with power saving circuit |
| 04/04/1990 | EP0361287A2 High-frequency transmitter, in particular for security devices |
| 04/04/1990 | EP0361024A2 Device for the processing and wireless transmission of measured values |
| 04/04/1990 | EP0360990A1 Method for generating an amplitude-modulated ISB signal, and device for carrying out the method |
| 04/04/1990 | EP0360979A2 Radio receiver for receiving digitally coded traffic information with current-saving stand-by function |
| 04/04/1990 | EP0360803A1 Portable communications receiver with separate information presentation means and improved battery saving function. |
| 04/04/1990 | EP0142503B1 Transceiver with controller for multiple function switch |
| 04/04/1990 | CN2055653U Automatic remote-control machine for broadcast equipment |
| 04/04/1990 | CN1041075A New calibration method for improved us-made aeronautical hf emitter |
| 04/03/1990 | US4914716 Battery-operated facsimile machine |
| 04/03/1990 | US4914715 FM receiving circuit |
| 04/03/1990 | US4914714 Portable radio communication apparatus having diversity reception function |
| 04/03/1990 | US4914701 Method and apparatus for encoding speech |
| 04/03/1990 | US4914699 High frequency anti-jam communication system terminal |
| 04/03/1990 | US4914695 Method and apparatus for frequency control of multiple oscillators using a single frequency-locked-loop |
| 04/03/1990 | US4914693 Telephone subscriber circuit |
| 04/03/1990 | US4914680 Signal distinction circuit |
| 04/03/1990 | US4914674 Signal generator |
| 04/03/1990 | US4914517 Tuner control apparatus having tune-by-label capability and using alphabetical label storage |
| 04/03/1990 | CA1267453A1 Frequency modulation detectors |
| 03/28/1990 | EP0360489A2 Protection against loss or corruption of data upon switchover of a replicated system |
| 03/28/1990 | EP0360476A2 Homodyne-type spread spectrum transmitter/receiver |
| 03/28/1990 | EP0360338A2 Local communication bus system comprising a set of interconnected devices, a control bus, and a set of signal interconnections, and a device and a switchbox for use in such system |
| 03/28/1990 | EP0360178A2 Transmitter circuit for efficiently transmitting communication traffic via phase modulated carrier signals |
| 03/28/1990 | CN1040892A Signal integrity control technique for rf communication system |
| 03/28/1990 | CN1007397B Frequency synthesizer of radio broadcast telephone system with multi-allotable frequency channels |
| 03/28/1990 | CN1007395B Switch dividing device for common reception |
| 03/27/1990 | US4912775 RF converter circuit |
| 03/27/1990 | US4912774 Instantaneous voltage drop detector |
| 03/27/1990 | US4912773 Communications system utilizing a pilot signal and a modulated signal |
| 03/27/1990 | US4912766 Speech processor |
| 03/27/1990 | US4912763 Process for multirate encoding signals and device for implementing said process |
| 03/27/1990 | US4912722 Self-synchronous spread spectrum transmitter/receiver |
| 03/27/1990 | US4912721 Cable television spread spectrum data transmission apparatus |
| 03/27/1990 | US4912667 Transmission arrangement for digital signals |
| 03/27/1990 | US4912602 Mechanical fastening system for an electronic equipment housing |
| 03/22/1990 | WO1990003069A1 Adaptive scanning method |
| 03/22/1990 | WO1990003068A1 Two-way radio communications system having selectable operating modes |
| 03/22/1990 | DE3927873A1 Interference suppressor for neighbouring channel of FM receiver - has two detectors amplifying and demodulating IF signals arriving from wide and narrow band filters respectively |
| 03/22/1990 | DE3831670A1 Microprocessor-controlled operating section |
| 03/21/1990 | EP0359477A2 Linearization of an amplification in an RF amplifier |
| 03/21/1990 | EP0359352A2 Telecommunications transmission security arrangement |
| 03/21/1990 | EP0359325A1 Device for transmitting data words representing a digitized analog signal and device for receiving the transmitted data words |
| 03/21/1990 | EP0359183A2 System and method of transmitting a complex waveform over a communication channel utilizing lincompex techniques |
| 03/21/1990 | EP0358649A1 Arrangement for filtering an incoming fm signal. |
| 03/21/1990 | CN2054956U Multi-purpose aural transmitter |
| 03/21/1990 | CN2054716U Toy device of able speaking and singing |
| 03/20/1990 | US4910800 Dual branch receiver with wobbled oscillator for distortion reduction |
| 03/20/1990 | US4910799 Noise reduction apparatus |
| 03/20/1990 | US4910763 Switching device for connecting a data transmission system to the telephone switched network |
| 03/20/1990 | US4910752 Low power digital receiver |
| 03/20/1990 | US4910481 For radio communication equipment |
| 03/20/1990 | CA1266885A1 Output power control circuit for a mobile radio apparatus |
| 03/14/1990 | EP0358466A2 A direct sequence modulation apparatus |
| 03/14/1990 | EP0358166A2 Power saving arrangement and power saving method |
| 03/14/1990 | EP0357996A1 Frequency modulator utilizing frequency synthesizer |
| 03/14/1990 | EP0357909A1 Remote control electrical device |
| 03/14/1990 | CN2054604U Pocket-size hearing aid radio |
| 03/14/1990 | CN2054596U Transistor radio with treating function |
| 03/14/1990 | CN1040468A Telecommunications transmission security arrangement |
| 03/13/1990 | US4908846 Mobile telephone terminal having function to perform call clear process |
| 03/13/1990 | US4908839 Channel switching system |
| 03/13/1990 | US4908837 Receiver for spread spectrum communication |
| 03/13/1990 | US4908836 Method and apparatus for decoding multiple bit sequences that are transmitted simultaneously in a single channel |
| 03/13/1990 | US4908820 Non-reciprocal bidirectional duplexer |
| 03/13/1990 | US4908785 Data compression method for telemetry of vibration data |
| 03/13/1990 | US4908587 Antenna selector |
| 03/13/1990 | US4908530 Non-linear squelch circuit for IEEE-802. 3 protocol |
| 03/13/1990 | US4908523 Electronic circuit with power drain control |
| 03/08/1990 | WO1990002390A1 Apparatus for controlling a television receiver or the like |
| 03/06/1990 | US4907293 Adjacent channel interference suppressing system for FM receiver |
| 03/06/1990 | US4907291 Transmitter/receiver apparatus |
| 03/06/1990 | US4907277 Method of reconstructing lost data in a digital voice transmission system and transmission system using said method |
| 03/06/1990 | US4907249 Automatic off/on circuit for monitoring data receiving and storing devices |
| 03/06/1990 | US4907219 Duplex communication wireless |
| 03/06/1990 | US4907217 System and method of transmitting a complex waveform over a communication channel utilizing lincompex techniques |
| 03/06/1990 | US4907087 Transmission of signals through analog channels using adaptive frequency modulation |
| 03/06/1990 | US4907085 Television system user-accessible component display apparatus |
| 02/28/1990 | EP0356055A1 Interference suppression for transmitted signals and demodulation of vestigial sideband signals |
| 02/28/1990 | EP0355973A2 Digital mobile phone |
| 02/28/1990 | CN2053822U Tv dual sound/stereophony receiver |
| 02/27/1990 | US4905307 Synchronous receiver with direct mixing |
| 02/27/1990 | US4905305 Method and apparatus for controlling the frequency of operation and at least one further variable operating parameter of a radio communications device |
| 02/27/1990 | US4905303 Television audio signal converter |
| 02/27/1990 | US4905271 Method of preventing auto theft |
| 02/27/1990 | US4905270 Vehicular hands-free telephone system |
| 02/27/1990 | US4905087 UHF FM receiver having improved frequency stability and low RFI emission |
| 02/27/1990 | US4905003 Analog/digital data storage system |
| 02/27/1990 | US4904549 Battery housing with integral latch and positive displacement apparatus |
| 02/26/1990 | EP0235264A4 Digital radio frequency receiver. |
| 02/22/1990 | WO1990001847A1 Television receiver |
| 02/22/1990 | WO1990001830A1 Interference suppression for transmitted signals and demodulation of vestigial sideband signals |
| 02/21/1990 | EP0354955A1 Improved multi-band programmable compression system. |
| 02/20/1990 | US4903336 Tuner with a timepiece |
| 02/20/1990 | US4903335 Power-saving type receiver |
| 02/20/1990 | US4903334 System for preventing crosstalk in a multi-input electronic device |
| 02/20/1990 | US4903333 Apparatus for automatically adjusting length of antenna of radio receiver |