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)
10/1980
10/14/1980	US4228540 Radio receiver
10/14/1980	US4228539 High frequency transmitter
10/14/1980	US4228322 Decreasing time duration of recorded speech
10/14/1980	US4228319 Automatic radio telephone system
10/14/1980	CA1087770A1 Active two-wire to four-wire coupling circuits
10/07/1980	US4227258 Housing for a hand held transmitter-receiver
10/07/1980	US4227257 Power supply circuit for an electronic tuning type receiver with a memory element
10/07/1980	US4227254 Quasi-analog channel indicator for radio receivers
10/07/1980	US4227186 Self-stabilizing analog to digital converter useful in phase locked loop tuning systems
10/07/1980	CA1087251A1 Power control on satellite uplinks
10/02/1980	WO1980002092A1 Asynchronous data receiver
10/01/1980	EP0016472A1 Arrangement with a hybrid for the two-wire to four-wire transition in PCM-time division multiplexing systems
10/01/1980	EP0016149A1 Switch means for radio alarm device
09/1980
09/30/1980	US4225976 Pre-calibration of gain control circuit in spread-spectrum demodulator
09/30/1980	US4225975 Noise suppression circuit for use with FM receiver
09/30/1980	US4225974 Double super-heterodyne receiver
09/30/1980	US4225970 Splash proof portable two-way data terminal/radio
09/30/1980	US4225888 High efficiency facsimile transmission system
09/30/1980	US4225829 Local oscillator circuit having two phase locked loops having respective frequency dividers with a common division ratio
09/30/1980	US4225828 PLL Synthesizer
09/30/1980	US4225823 Front end circuits of FM receivers
09/30/1980	US4225822 Amplitude modulation circuit for a transmitter
09/30/1980	US4225821 Electronic signalling device to alert CB radio equipped vehicles
09/30/1980	CA1086830A1 Implantable receiver circuit
09/30/1980	CA1086655A1 Audio signal quality indicating circuit
09/23/1980	US4224691 Tuning indicator system for FM radio receiver
09/23/1980	US4224602 Signalling device
09/23/1980	US4224471 FM Radio receiver
09/23/1980	US4223830 Identification system
09/17/1980	EP0015797A1 Selectively variable audio-video interconnection system
09/17/1980	EP0015754A1 Audio transmission system
09/17/1980	EP0015706A1 Electronically tunable radio receiver
09/16/1980	US4223406 Multi band radio receiver system with phase locked loop
09/16/1980	US4223404 Apparatus for recycling complete cycles of a stored periodic signal
09/16/1980	CA1085741A1 Muting circuit for loudspeaker
09/09/1980	US4222121 Frequency synthesizer type receiver having a channel selection device
09/09/1980	US4222120 Tuning position display system
09/09/1980	US4222119 Multi-purpose radio
09/09/1980	US4222115 Spread spectrum apparatus for cellular mobile communication systems
09/09/1980	US4222113 Transmit-receive switching unit
09/09/1980	US4221934 Compandor for group of FDM signals
09/09/1980	US4221930 FM Defect compensation apparatus
09/09/1980	US4221928 Noise reduction circuit for stereo signals
09/03/1980	EP0015161A1 Electronically tunable receiver
09/03/1980	EP0014750A1 System with several radiotelephones for changing over from "alternating duplex communication" to "two-way speech communication"
09/02/1980	US4220875 Electronic circuit having its impedance controlled by an external signal
09/02/1980	CA1085004A1 Amplifier with muting circuit
08/1980
08/26/1980	US4219888 Surface acoustic signal defader
08/26/1980	US4219779 Self-oscillating mixer circuit
08/26/1980	US4219778 Signal processing circuit for an FM signal receiver
08/26/1980	CA1084642A1 Bidirectional voice frequency repeater
08/19/1980	US4218774 Automatic gain control circuit
08/19/1980	US4218662 Circuit arrangement for optional dynamic compression or expansion
08/19/1980	CA1084185A1 Transformerless two-wire/four-wire hybrid with dc sourcing capability
08/19/1980	CA1084126A1 High-speed tone decoder utilizing a phase-locked loop
08/19/1980	CA1084119A1 Digital frequency synthesizer receiver
08/12/1980	US4217661 Audio signal transmission system and method incorporating automatic frequency correction
08/12/1980	US4217586 Channel estimating reference signal processor for communication system adaptive antennas
08/12/1980	US4217554 Circuits for reducing intermodulation noise
08/12/1980	US4217549 Device for two-way information link
08/12/1980	CA1083488A1 Pulse code modulated digital audio system
08/07/1980	WO1980001633A1 Modified vestigial side band transmission system
08/07/1980	WO1980001631A1 Process and device for detecting and interpreting a distress signal
08/06/1980	EP0014110A1 Transmitter-receiver and use thereof in a telecommunication network
08/05/1980	US4216545 Method and apparatus of communicating emergency signals from a transceiver in a transceiver communication network, particularly for citizen-band emergency use
08/05/1980	US4216496 Apparatus for detecting and measuring interference in transmission signals
08/05/1980	US4216432 Automatic switching system for a combination transceiver-auxilliary receiver radio
08/05/1980	US4216430 Noise eliminating circuit with automatic gain control
08/05/1980	US4216427 Adaptive audio compressor
08/05/1980	US4216354 Process for compressing data relative to voice signals and device applying said process
08/05/1980	US4216353 Adaptive multiplex blend control for stereo decoder to maintain signal to noise ratio
07/1980
07/29/1980	US4215431 Wireless transmission system
07/29/1980	US4215428 Time ratio controlled inverter
07/29/1980	US4215372 Television signal interference elimination circuit including a trap circuit
07/29/1980	US4215312 Radio receiver
07/29/1980	CA1082777A2 Frequency locking system
07/23/1980	EP0013421A1 Device for the location of persons
07/23/1980	EP0013343A1 Process and device to detect a pseudo-random sequence of 0 degree and 180 degree phase changes of the carrier in a data receiver
07/23/1980	EP0013341A1 Time compression system for speech signals
07/22/1980	US4214244 Null pattern technique for reduction of an undesirable interfering signal
07/22/1980	US4214217 Electronic tuning circuit having image trapping element
07/22/1980	US4214212 Tuner device for a television receiver
07/22/1980	US4214211 Electrostatic destruction preventing circuit for use in a receiver
07/22/1980	US4214129 Sideband cancellation circuit for a transmission line communications system receiver
07/22/1980	CA1082313A1 Transmitter/receivers
07/15/1980	US4213103 Circuit for detecting and controlling simultaneous conduction of two switches connected in series
07/15/1980	US4213096 Phaselock receiver with phaselock detector
07/15/1980	US4213078 Battery holder and connector for a radio receiver or the like
07/15/1980	CA1081873A1 Dual mode frequency synthesizer for a television tuning apparatus
07/15/1980	CA1081791A1 Am receiver
07/10/1980	WO1980001446A1 Micro-wave frequency telecommunication device
07/09/1980	EP0013248A1 Hyperfrequency telecommunications apparatus
07/09/1980	EP0013223A1 Harmonics filtration device for a radio transmitter
07/09/1980	EP0013124A1 Digital signal processing method and apparatus
07/08/1980	US4212013 Duplex-transmitter receiver arrangement
07/08/1980	US4211998 Method of and remote control apparatus for remotely controlling a medical appliance
07/08/1980	US4211979 Circuit arrangement for eliminating waveform distortion of an angle-modulated signal transmitted over multipaths
07/08/1980	US4211978 Cross-talk component cancellation circuit in an angle-modulated wave signal transmission system
07/08/1980	US4211977 Mixer circuit arrangement
07/08/1980	US4211975 Local signal generation arrangement

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