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)
09/1990
09/11/1990US4956876 DC decoupled radio communication system
09/11/1990US4956871 Improving sub-band coding of speech at low bit rates by adding residual speech energy signals to sub-bands
09/11/1990US4956837 Apparatus for avoiding spectrum spreading when switching a transmitter on and off
09/11/1990US4956747 For controlling equipment
09/11/1990US4956710 Television receiver tuner high pass input filter with CB trap
09/11/1990US4956644 Channelized binary-level radiometer
09/11/1990US4956614 Device including a radial combiner for electromagnetic waves
09/07/1990WO1990010340A1 Booster system for hand-held radiotelephone
09/07/1990WO1990010200A2 Identification system using hertzian waves, consisting of an interrogation station and a responder unit
09/06/1990DE3907073A1 Radio transceiver with holder
09/05/1990EP0385147A2 Apparatus for controlling the reception capacity of radio alarm receivers
09/05/1990EP0315686A4 Dual port fm demodulation in phase locked receivers
09/05/1990CN2061746U Electric acoustooptic display for recorder
09/05/1990CN1045207A Automatically activated commercial message timer
09/04/1990US4955085 Series RF/parallel if mixer array
09/04/1990US4955084 Paging receiver with metallic display frame structure increasing antenna gain
09/04/1990US4955083 Dual mode radio transceiver for an SSB communication system
09/04/1990US4955077 Radio with broad band automatic gain control circuit
09/04/1990US4955075 Battery saver circuit for a frequency synthesizer
09/04/1990US4955073 Automatic search tuner
09/04/1990US4955072 Method of generating an amplitude-modulated ISB transmission signal and apparatus for carrying out the method
09/04/1990US4955071 Converter console
09/04/1990US4955038 Low-power RF receiver
09/04/1990US4954795 Surface acoustic wave filter for suppressing surface to surface interference for a satellite communication receiver
09/04/1990US4954732 Adaptive nonlinear frequency domain filter with low phase loss
09/04/1990CA1273697A1 Multiplexed digital packet telephone system
09/04/1990CA1273478A1 Quick attach-detach mechanism for audio components
08/1990
08/30/1990DE3904181A1 Broadcast receiving device for motor vehicles
08/29/1990EP0384544A2 Analog-to-digital encoder and digital-to-analog decoder
08/29/1990EP0384388A1 Automatically activated commercial message timer
08/29/1990EP0247118B1 Interface circuit
08/29/1990EP0207964B1 Broadcast stereo companding system and apparatus
08/28/1990US4953186 Phase jitter tracker
08/28/1990US4953182 Gain and phase correction in a dual branch receiver
08/28/1990US4953178 Spread spectrum communication system
08/28/1990US4952193 Interference cancelling system and method
08/28/1990US4951817 Beeper slip on cover
08/23/1990WO1990009707A1 Transponder system
08/23/1990WO1990009706A1 Vehicle telephone apparatus
08/23/1990DE3904648A1 Verfahren und anordnung zur unterdrueckung von unerwuenschten spektren bei einer digitalen dynamikexpansion Method and arrangement for suppressing undesired spectra in a digital dynamic expansion
08/23/1990DE3904647A1 Arrangement for dynamic expansion
08/22/1990EP0182915B1 Apparatus for transmitting digital signals
08/22/1990EP0179056B1 Extended threshold analog to digital conversion apparatus for an rf receiver
08/22/1990CN2060960U Single signal line mini-transceivers
08/22/1990CA2010536A1 Booster system for hand-held radiotelephone
08/16/1990EP0382695A2 Transmitter arrangement for digitally modulated signals
08/16/1990EP0382675A1 FM receiver and communication systems including same
08/16/1990EP0381937A2 Warning messages reproduction system
08/16/1990EP0267184B1 Improvements in or relating to a transceiver interference cancellation system
08/16/1990DE4001747A1 Adaptable high pass filter assembly - has controllable cut=off frequency, and passes selectively signal components of higher frequencies
08/15/1990CN1009238B Tv signal frequency transforming circuit
08/14/1990US4949394 Addressable PCM music broadcast receiver
08/14/1990US4949383 Frequency domain speech coding
08/14/1990US4949340 Redundant repeater
08/14/1990US4949335 A TDM quasi-duplex system
08/14/1990US4949090 Transmit/receive module test system
08/14/1990US4948954 Interface for receiving electronic tokens
08/14/1990CA1272817A2 Subscriber unit for wireless digital telephone system
08/14/1990CA1272773A1 Electronic surveillance system and transceiver unit therefor
08/09/1990WO1990009064A1 Low time-delay transform coder, decoder, and encoder/decoder for high-quality audio
08/09/1990WO1990009061A1 Heterodyne stage having precise closed-loop control of the amplitude of the injection signal thereof
08/09/1990WO1990009022A1 Low bit rate transform coder, decoder and encoder/decoder for high-quality audio
08/09/1990DE4003671A1 Spread spectrum communication system - uses convolver as correlator for pseudo-random code signals
08/08/1990EP0381378A2 Method for manufacturing the chassis of a radio telephone and a chassis manufactured according to said method
08/08/1990EP0381215A2 Method and apparatus for reducing noise in a linked compressor-expander telecommunications system
08/08/1990EP0380563A1 Improved noise suppression system
08/08/1990EP0380475A1 Fm communications system with improved response to rayleigh-faded received signals
08/07/1990US4947457 Removable function box with contact block assembly
08/07/1990US4947456 Scanning radio receiver
08/07/1990US4947455 RF power supply for supplying a regulated power amplified unmodulated drive signal to an RF modulator
08/07/1990US4947454 Radio with digitally controlled audio processor
08/07/1990US4947453 Transparent tone-in band transmitters, receivers and systems
08/07/1990US4947391 Arrangements for producing and recognizing information identifying non-occupied transmission paths in a digital transmission system
08/07/1990US4947141 Oscillator network for radio receiver
08/07/1990CA2008969A1 Spread spectrum communication device
08/02/1990WO1990009063A1 Process for transmitting a signal
08/02/1990DE4002672A1 Mobile audio system for road vehicles - has plug in unit that engages with permanent amplifier fixed to vehicle
08/02/1990CA2008922A1 Method and apparatus for reducing noise in a linked compressor- expander telecommunications system
08/01/1990EP0380361A2 Transmitter circuit with gallium arsenide field effect transistor
08/01/1990EP0380290A2 Voice communication link interface apparatus
08/01/1990EP0380167A1 Adaptive predistortion circuit
08/01/1990EP0379889A2 Remote control of selected television receivers
08/01/1990EP0379640A2 Transmission system for a radio transceiver
07/1990
07/31/1990CA1272317A1 Subscriber unit for wireless digital telephone system
07/31/1990CA1272316B Subscriber unit for wireless digital telephone system
07/31/1990CA1272315A1 Cordless telephone
07/31/1990CA1272284A1 Geographic blackout method for direct broadcast satellite system
07/31/1990CA1272249A1 Vectorial adaptive filtering apparatus with convergence rate independent of signal parameters
07/31/1990CA1272247A1 Fm receivers using two-terminal negative admittance networks
07/26/1990WO1990008442A1 Dual communication mode video tape recorder
07/26/1990WO1990008435A1 A tdm quasi-duplex system
07/26/1990WO1990008432A1 Method for transmission and reception of reflex-modulated signals
07/26/1990WO1990008431A1 Multi-attachment portable radio
07/26/1990WO1990008404A1 Reactance buffered loop antenna and method for making the same
07/25/1990EP0378609A1 Process for transmitting an audio signal.
07/24/1990US4944025 Direct conversion FM receiver with offset
07/24/1990US4944024 Method and apparatus for reducing noise in a linked compressor-expander telecommunications system
07/24/1990US4944012 Speech analyzing and synthesizing apparatus utilizing differential value-based variable code length coding and compression of soundless portions
07/24/1990US4943983 Subscriber unit for wireless digital telephone system
07/24/1990US4943977 Correlation pulse generating circuit in a spread spectrum receiver
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