Patents
Sitemap › H04 - Electric communication technique › H04B - Transmission › 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
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)
07/1980
07/01/1980US4210828 Device for improving output waveform of manually controllable pulse generator for use in preset electronic tuning control device
07/01/1980CA1080869A1 Electronic hybrid and hybrid repeater
07/01/1980CA1080844A1 Personal audio listening system
07/01/1980CA1080808A1 Radio receiver blanker gate
07/01/1980CA1080630A1 Noise filtering device
06/1980
06/25/1980EP0012394A1 Receiving circuit for synchronizing a pseudorandom generator with a signal received from a transmitter
06/24/1980US4209834 State variant correlator
06/24/1980US4209758 Method and apparatus for the automatic matching of a transmitter to an antenna
06/24/1980US4209748 Directional radio system for single sideband operation
06/24/1980CA1080348A1 Surface wave device for use in a ghost cancellation system
06/17/1980US4208630 Narrow band paging or control radio system
06/17/1980US4208547 Method and apparatus for reducing noise in stereophonic signals
06/12/1980WO1980001227A1 Selective amplifier
06/11/1980EP0011720A1 Circuitry for suppressing the influence of interfering voltages at the evaluation of the condition of a signal on transmission lines, particularly on subscriber lines in telephone installations
06/11/1980EP0011647A1 Delay circuit
06/11/1980EP0011646A1 Electronically tuned radio receiver
06/10/1980US4207549 VHF Television tuner circuit with supression of undesired signals
06/10/1980US4207532 Frequency signal splitting circuit
06/10/1980US4207530 Electrically tunable inductor and method
06/10/1980US4207529 Radio receiver
06/10/1980US4207525 Carrier control system for suppressed carrier modulators
06/10/1980US4207432 Noise eliminating system
06/10/1980CA1079395A1 Antenna for miniature radio set
06/10/1980CA1079362A1 Adaptive audio compressor
06/10/1980CA1079361A1 Transmitter processing apparatus (articulation enhancer and noise excluder for single-sideband transmitter)
06/03/1980US4206462 Secure communication and ranging system
06/03/1980US4206412 Trap circuit for blocking spurious signals from a T.V. intermediate frequency amplifier
06/03/1980US4206410 Automatic frequency control system for single sideband signal receiver
06/03/1980US4206409 Motor vehicle communication apparatus
06/03/1980US4206317 Reduction of adjacent channel interference
06/03/1980CA1078957A1 Ghost cancellation device
05/1980
05/27/1980US4205353 Combination device having a magnetic recording and reproducing unit and an electronic tuning type receiver
05/27/1980CA1078462A1 Multiple-band digital frequency synthesizer receiver
05/20/1980US4204173 Tuning circuit with provisions for reducing pulse width jitter
05/20/1980US4204172 Automatic gain control device for a single-sideband receiver
05/20/1980US4204170 Impulse noise limiter circuit
05/20/1980US4204169 Muting circuit in an electronic tuning type receiver
05/20/1980US4204166 Very high frequency tuner
05/20/1980US4204164 Noise detector circuit
05/20/1980US4204091 Cancellation of interference distortions caused by intermodulation between FM signals on adjacent channels
05/20/1980CA1078063A1 Noise reduction circuit
05/20/1980CA1078022A1 Fm receiver
05/20/1980CA1078021A1 Radio control transmitter
05/15/1980WO1980001023A1 High efficiency,light weight audio amplifier and power supply
05/14/1980EP0010923A1 Improvements in battery powered receivers
05/14/1980EP0010600A1 Method for coded transmission of speech signals, use of the method in a time-division multiplex transmission system and device for carrying out the method
05/14/1980EP0010552A1 Method and circuit for measuring the reception quality of a frequency modulated very high frequency signal
05/13/1980US4203071 Pseudo-random-number-code-detection and tracking system
05/13/1980US4203070 Pseudo-random-number code detection and tracking system
05/13/1980US4203012 Hybrid circuit using current mirror circuits
05/13/1980US4203009 Unbalanced/balanced converter circuits
05/06/1980US4202024 Repeater bypass protection apparatus
05/06/1980US4201960 Method for automatically matching a radio frequency transmitter to an antenna
05/06/1980US4201944 Receiver having a measurement instrument which is used as a tuning scale
05/06/1980US4201943 Tuning circuit for a high frequency heterodyne receiver with tuning controlled by direct voltage
05/06/1980US4201895 Passive audio signal mixing apparatus
04/1980
04/30/1980EP0010109A1 Method and arrangement for indicating the reception quality of a frequency modulated very high frequency signal
04/29/1980US4200837 Remote radio selector with manual override
04/29/1980CA1076703A1 Digital speech communication system
04/29/1980CA1076661A1 Signal processing means and method
04/29/1980CA1076651A1 Blanker inhibit circuit
04/22/1980US4199725 FM Receiver muting range setting circuit
04/22/1980US4199723 Automatic modulation control apparatus
04/22/1980US4199721 Hand-held microphone for transceiver
04/22/1980CA1076220A1 Balanced synchronous detector circuit
04/22/1980CA1076212A1 Multiple-band digital frequency synthesizer receiver
04/22/1980CA1076211A1 Receiver selecting (voting) system
04/22/1980CA1076209A1 Combination microphone, speaker, and control unit for a radio transceiver
04/17/1980WO1980000770A1 Driving point impedance
04/17/1980WO1980000769A1 Frequency-sensitive electronic hybrid
04/16/1980EP0010022A1 Device for conditioning speech signals and transmitter comprising such a device
04/16/1980EP0009618A1 Circuit and method for controlling a channel display in a superheterodyne receiver
04/15/1980US4198611 Redundancy system with eight devices for five channels
04/15/1980US4198604 Heterodyne phase lock system
04/15/1980US4198602 Limiter circuit for limiting pulsive noises
04/15/1980US4198601 Control unit for transceiver
04/15/1980US4198543 Stereo composite processor for stereo radio receiver
04/15/1980US4198541 Signal holding circuit
04/15/1980CA1075778A1 Hybrid circuit
04/15/1980CA1075773A1 Am-fm receiver having improved mode conversion
04/15/1980CA1075771A1 Two-way mobile radio voice/data shared communications system
04/08/1980US4197504 Common indicator unit for radio receiver and transceiver
04/08/1980US4197498 Remote control system in a radio transceiver
04/08/1980US4197496 Pilot signal transmission system
04/08/1980CA1075318A1 Crystalless scanning radio receiver controlled by processing means
04/02/1980EP0009295A1 Infrared light communication equipment
04/01/1980US4196394 Antenna/like impedance matcher
04/01/1980US4196392 Method and apparatus for monitoring and controlling the anode dissipation of transmitters
03/1980
03/25/1980US4195263 Selective call radio communication receiver
03/25/1980US4195203 Noise cancelling system for FM receiver
03/25/1980CA1074448A1 Method of electrically converting an analog signal into a digital representation
03/20/1980WO1980000516A1 Switch means for radio alarm device
03/18/1980US4194183 Apparatus for electrically converting an analog signal into a digital representation
03/18/1980US4194161 Switching modulators and demodulators utilizing modified switching signal
03/18/1980US4194158 Integrated front end circuit for VHF receiver
03/18/1980US4194157 Portable radio receiver with detachable speaker unit
03/18/1980US4194155 Radio receiving device for automotive use
03/18/1980US4194154 Narrow bandwidth network compensation method and apparatus
03/18/1980US4194151 Multifrequency generator
03/18/1980US4194087 Control circuit and FM stereo receiver using same
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