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)
10/1990
10/23/1990US4965607 Antenna coupler
10/23/1990US4965557 Interactive control of entertainment electronics apparatus
10/23/1990US4964693 Radio having optical controls and method of optically controlling same
10/23/1990CA1275514C Arrangements for producing and recognizing information identifying non-occupied transmission paths in a digital transmission system
10/23/1990CA1275447C Fm communication system with improved response to rayleigh-faded received signals
10/18/1990WO1990012463A1 Spread spectrum-time diversity communications systems and transceivers for multidrop local area networks
10/18/1990WO1990012429A1 Band rejection filtering arrangement
10/18/1990WO1990011675A2 Mixed modulation level communication system
10/17/1990EP0392792A2 Methods and apparatus for transparent tone-in-band transmitter, receiver and system processing
10/17/1990EP0392772A2 Sound signal processing system
10/17/1990EP0392327A1 Damping circuit for the antenna resonance circuit of a radio transmitter-receiver
10/17/1990EP0392132A2 Radio transceiver apparatus with booster
10/17/1990EP0392079A2 Radio transceiver
10/16/1990US4964121 Battery saver for a TDM system
10/16/1990US4964018 Multi-purpose display module system for an electronic instrument
10/16/1990US4963945 Band rejection filtering arrangement
10/16/1990US4963887 Full duplex transponder system
10/16/1990US4963876 Thin programmable remote control transmitter
10/16/1990US4963838 Frequency synthesizer
10/15/1990WO1990013195A1 Analog/digital voice storage cellular telephone
10/11/1990DE3910976A1 Method and device (time code interface) to synchronise an audio-visual sequence
10/10/1990EP0391794A2 Radio communication apparatus
10/10/1990EP0391657A2 Tuner control apparatus having tune-by-label capability
10/10/1990EP0391656A2 Tuner control apparatus having tune-by-label capability and using alphabetical label storage
10/10/1990EP0391020A1 Housing for a portable radio telephone device
10/10/1990EP0390822A1 Identification apparatus and methods.
10/10/1990CN2063701U Infrared remote controlled multi-way electric outlet
10/09/1990US4962544 Radio receiver
10/09/1990US4962543 Battery rundown protection system for an automobile having a radio telephone apparatus with an automatic answering function
10/09/1990US4962523 Radio telephone set used as portable set and vehicle-mounted set
10/09/1990US4962507 Feed forward spread spectrum signal processor
10/09/1990US4962488 Technique for surface to surface communications using high frequency radio with low probability of intercept signaling
10/04/1990WO1990011658A1 A transceiver employing direct sequence spread spectrum techniques
10/04/1990DE4009835A1 Car tape recorder or CD player - has removable unit contg. command data generator and command signal transmitter in response to actuating signal
10/04/1990DE4000425A1 Front cover device for automobile cassette or disc player - has pivoted inner cover and removable front cover providing operating controls
10/03/1990EP0390588A2 Input/output switching circuit
10/03/1990EP0390417A2 Spread-spectrum identification signal for communications systems
10/03/1990EP0390354A2 Apparatus for decreasing the barrier attenuation requirements set on a duplex filter in a digital radio telephone
10/03/1990EP0390041A2 Remote-control apparatus for electronics apparatus
10/03/1990EP0389737A2 Mobile radio telephone device
10/03/1990EP0389705A2 Non-stationary antenna
10/03/1990EP0389676A2 Portable communication device
10/03/1990EP0389559A1 Moldable/foldable radio housing.
10/03/1990EP0389493A1 Tvro receiver system with automatic bandwidth adjustment
10/03/1990EP0389492A1 Intelligent alarm apparatus with interfacing to a telephone network
10/03/1990CN2063320U Micro electronic instrument hung at root of auricle
10/03/1990CN1045903A Quieting receiver during power interruption
10/03/1990CN1009890B Signal receiver
10/03/1990CA2013424A1 Microwave electric power receiver
10/02/1990USH832 Planar monolithic self-oscillating mixer
10/02/1990US4961203 Signal generator
10/02/1990US4961190 (1+N) Hitless channel switching system
10/02/1990US4961180 Arrangements for producing and recognizing information identifying non-occupied transmission paths in a digital transmission system
09/1990
09/29/1990WO1990011653A1 Paging receiver with continuously tunable antenna and rf amplifier
09/29/1990WO1990011539A1 Radio having optical controls
09/29/1990CA2049969A1 Paging receiver with continuously tunable antenna and rf amplifier
09/26/1990EP0389183A1 Quieting receiver during power interruption
09/26/1990EP0389174A1 Wireless headphones
09/26/1990EP0389012A1 Broadcast receiver for radio or television signals, including a memory for storing preset stations
09/26/1990EP0388919A2 Matrix circuit of FM stereo multiplex demodulation circuit
09/26/1990EP0388894A1 A transmission power control system
09/26/1990CN2062925U "frequency-amplitude" phase-to-earth rebroadcasting machine for rural area
09/26/1990CN2062870U Tripurpose radio with time-counting and timing functions
09/26/1990CN2062827U Receiver for ultrasonic flowmeter
09/26/1990CN1045671A Full-compatibility railway dispatching system device with radio
09/25/1990US4959859 FM Channel separation adjustment
09/25/1990US4959826 Spread spectrum optical communication system with heterodyne detection
09/25/1990US4959810 Universal remote control device
09/25/1990US4959720 Tuner control apparatus having tune-by-label capability
09/25/1990CA1274630A2 Subscriber unit for wireless digital telephone system
09/25/1990CA1274595A1 Signal receiver
09/24/1990CA2012183A1 Spread spectrum communication device
09/21/1990WO1990011652A1 Dsp based radio with diminished power requirements
09/20/1990WO1990010987A2 Energy saving protocol for a communication system
09/20/1990WO1990010982A1 Spread spectrum communications system with randomizing signal
09/20/1990WO1990010981A1 Method for linking rds programme services and rds
09/20/1990WO1990010980A1 Time domain radio transmission system
09/20/1990WO1990010955A1 Battery housing
09/20/1990DE4006427A1 Display system with switched display function - has memory holding two=dimensional image data groups corresponding to respective functions
09/19/1990EP0387810A2 Mobile receiver
09/19/1990EP0387516A2 Combination of a car radio and other communication means
09/19/1990CN2062528U Additional tv double sound/stereo receiver
09/19/1990CN2062527U Radio earphone
09/19/1990CN1045496A Heterodyne stage having precise closed-loop control of amplitude of injection signal thereof
09/18/1990US4958382 Radio transceiver apparatus for changing over between antennas
09/18/1990US4958359 Communication apparatus
09/18/1990US4956895 Removable clip for portable equipment
09/18/1990CA1274283A1 Modified multi-path detector
09/18/1990CA1274282A1 Transmitter having means for controlling out-of-band radiation
09/13/1990DE4007411A1 Data reduction system for digital tone signals
09/13/1990DE3916400A1 Cable reel with incorporated radio appts. - insertable into reel and does not co-rotate on extension cable winding
09/12/1990EP0387071A2 Codable electronic devices, e.g. transponders
09/12/1990EP0387003A1 A shortened mast antenna with compensated circuits
09/12/1990EP0386917A2 Signal distribution systems
09/12/1990EP0386836A1 Method of processing a radio data signal and receiver for performing said method
09/12/1990EP0386835A1 Method of processing a radio data signal, and receiver for performing said method
09/12/1990EP0386718A2 circuit arrangement
09/12/1990EP0386418A2 Method for data reduction of digital audio signals and for approximate recovery of same
09/12/1990EP0386029A1 Demodulation method.
09/12/1990CN1009610B Home unit for wireless digital telephone system
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