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)
11/1990
11/28/1990EP0215117B1 Spread spectrum adaptive antenna interference canceller
11/28/1990CN1010647B High-speed digital loop transceiver
11/28/1990CN1010637B Improvements to pin diode attenuators
11/27/1990US4974250 Adapter for mounting a portable telephone on a vehicle
11/27/1990US4974099 Communication signal compression system and method
11/27/1990US4974087 Parallel sound if with reference carrier derived from quasi-synchronous video detector
11/27/1990CA1277026C Digital control bus system
11/27/1990CA1277000C Data transmission system comprising smearing filters
11/27/1990CA1276985C Rf power control circuit
11/27/1990CA1276984C Intermittent driven transmitter
11/22/1990EP0398729A2 Processor modem
11/22/1990EP0398688A2 Procedure for forming frequencies of a digital radio telephone
11/22/1990EP0398550A2 Power status detecting apparatus
11/22/1990EP0398329A2 Spread spectrum signal demodulation circuit
11/21/1990CN1010542B Multi-frequency signal receiver
11/20/1990US4972512 Circuit for linearly amplifying and demodulating an AM-modulated signal, and integrated semiconductor element for such circuit
11/20/1990US4972510 Method and apparatus for squelching dependent on detected bond rate to reduce unwanted audible noise on a mixed voice data channel
11/20/1990US4972508 Housing for a battery powered device
11/20/1990US4972484 Method of transmitting or storing masked sub-band coded audio signals
11/20/1990US4972482 Fm stereo demodulator
11/20/1990US4972480 Holographic communications device and method
11/20/1990US4972468 Transceiver for hanging on an ear
11/20/1990US4972455 Dual-bandwidth cellular telephone
11/20/1990US4972440 Transmitter circuit for efficiently transmitting communication traffic via phase modulated carrier signals
11/20/1990US4972438 Self-oscillating transmitter
11/20/1990US4972433 Receiver capable of improving signal-to-noise ratio in reproducing digital signal
11/20/1990US4972405 Data path protection
11/20/1990US4972353 Radio-frequency transformer providing automatic gain control and overload protection
11/20/1990CA1276685C Radio transceiver including an antenna switching circuit capable of changing reception sensitivity
11/20/1990CA1276682C Secure communication system for multiple remote units
11/18/1990CA2017188A1 Correlation processing device using a surface acoustic wave convolver
11/15/1990WO1990013952A1 Radio and electronic card assembly
11/15/1990WO1990013951A1 Thin articulated pager
11/15/1990WO1990013882A1 Broadcast receiver, in particular for vehicles
11/15/1990DE4012273A1 Fernsteuereinheit Remote control unit
11/15/1990DE4007572A1 Acoustic device for tuner
11/15/1990DE3914104A1 Rundfunkempfaenger, insbesondere fahrzeugempfaenger Rundfunkempfaenger, especially fahrzeugempfaenger
11/14/1990EP0397575A2 Radiotelephone apparatus
11/14/1990EP0397546A1 Method and apparatus for information transmission between radio transceivers of the same frequency hopping network
11/14/1990EP0397445A2 Procedure for forming low power levels in a radio telephone transmitter
11/14/1990EP0397401A2 Circuit for forming low power levels in a transmitter of a radio telephone
11/14/1990EP0397094A2 Spread spectrum communication system
11/14/1990EP0396576A1 Microwave diode tuning circuit.
11/14/1990CN1010452B 接收机 Receiver
11/13/1990US4969852 Channel discriminator circuit for paging stations
11/10/1990CA2016374A1 Method and device for transmitting informations between frequency hopping radio transceivers in a network
11/10/1990CA2016239A1 Radiotelephone apparatus
11/08/1990DE4007982A1 Audio reproduction system for several audio signal sources - has tuner, signal, converter, clock pulses generator and digital signal processor
11/08/1990DE3914848A1 Switch=on delay arrangement for vehicle equipment, esp. radio - operates when ignition is switched on unless radio is switched on using its own controls
11/08/1990DE3914525A1 Microwave receiver for use in MM range - is formed as slot line structure in base metallising of planar, dielectric substrate
11/07/1990EP0396430A2 Radio frequency network
11/07/1990EP0396347A2 Radio transmitter capable of compensating for a frequency characteristic of an antenna and/or a coupling circuit
11/07/1990EP0396121A1 A system for coding wide-band audio signals
11/07/1990EP0395755A1 Radio telephone system with base unit and mobile unit, and associated method of registering an identification code
11/06/1990US4969211 Transceiver interference cancellation system
11/06/1990US4969210 Two-way radio having a PLL
11/06/1990US4969209 Broadcast receiver capable of selecting stations based upon geographical location and program format
11/06/1990US4969206 Portable data collection device with RF transmission
11/06/1990US4969162 Polled data network auto-equalizer system and method
11/06/1990US4969160 Dual channel clock recovery circuit
11/06/1990US4969159 Spread spectrum communication system employing composite spreading codes with matched filter demodulator
11/06/1990US4968970 Method of and system for power line carrier communications
11/06/1990US4968968 Transmitter phase and amplitude correction for linear FM systems
11/06/1990US4968967 Continuously transmitting and receiving radar
11/06/1990CA1276045C Radio communication method and system
11/05/1990CA2015945A1 Radio frequency network
11/01/1990WO1990013188A1 Receiver threshold extension
11/01/1990WO1990013184A1 Converter console
11/01/1990WO1990013176A1 Radio receiver with digital frequency selection
11/01/1990WO1990013175A1 Tunable resonance amplifier
10/1990
10/31/1990EP0395494A2 Method of and system for power line carrier communications
10/31/1990EP0395097A2 Remote control system for audio/video devices
10/31/1990EP0394747A2 Holding device for radiotelephone
10/31/1990EP0394744A2 Radiotelephone e.g. for motorcars
10/31/1990EP0394493A1 Audio signal demodulation circuit
10/31/1990EP0394491A1 Voice signal demodulation circuit
10/31/1990EP0394490A1 Audio signal demodulation circuit
10/31/1990EP0394257A1 Low power digital receiver.
10/31/1990DE4008984A1 Test data compression in function tester - applying digital signal train to tested sample and receiving reply signals for testing
10/30/1990US4967164 Adaptive predistortion circuit
10/30/1990US4967108 Differential-time-constant bandpass filter using the analog properties of digital circuits
10/25/1990DE3913278A1 Rundfunkempfaenger mit digitaler frequenzeingabe Rundfunkempfaenger with digital frequency input
10/25/1990DE3913273A1 Portable radio telephone handset carrier - has belt threaded through openings at each end of elongate holder
10/24/1990EP0394063A2 Radio communication apparatus having a simple structure
10/24/1990EP0394053A1 Miniature mobile radio communication equipment having a shield structure
10/24/1990EP0394012A1 Termination circuit for a two-wire transmission line
10/24/1990EP0393842A2 Closed-loop audio attenuator
10/24/1990EP0393653A2 Radio telephone suitable for portable and vehicle-mounted use
10/24/1990EP0393236A1 Electronic device housing with temperature management functions
10/24/1990EP0393122A1 Process and circuit arrangement for reversing frequency-modulated high-frequency signals
10/24/1990EP0393089A1 Transponder.
10/24/1990CN1046429A Parallel sound if with reference carrier derived from quasisynchronous video detector
10/24/1990CN1046422A System for compressing pass band of frequency-modulated wave
10/24/1990CN1046405A Remote controlling device
10/23/1990US4965855 Automobile shaped miniature radio set
10/23/1990US4965854 Noise blanker with continuous wave interference compensation
10/23/1990US4965852 Radio transmitter-receiver system for increasing or decreasing communication channels
10/23/1990US4965830 Apparatus for estimating distortion resulting from compressing digital data
10/23/1990US4965759 Spread-spectrum receiver
10/23/1990US4965641 Processor modem
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