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)
10/1991
10/16/1991EP0451342A2 Radio receiver with two receiving systems
10/16/1991EP0451232A1 Code acquisition method and circuit for a spread spectrum signal receiver.
10/15/1991US5058205 Transceiver squelch control method and apparatus
10/15/1991US5058203 Mobile telephone terminal having selectively used processor unit for low power consumption
10/15/1991US5058202 System and method of transmitting and receiving a licompex modulated signal over a communication channel utilizing frequency modulation techniques
10/15/1991US5058139 Notch filter for digital transmission system
10/15/1991US5058128 Spread spectrum communication receiver
10/15/1991US5058107 Efficient digital frequency division multiplexed signal receiver
10/15/1991CA1290840C Tool identification system
10/09/1991EP0451059A1 Circuit for transmission of radioelectric high-frequency radiation, especially for a portable electronic device included in a remote control system for motor vehicles
10/09/1991EP0450476A2 Telemetry transmitter
10/09/1991EP0450382A2 Method for frequency sharing in a frequency hopping communications network
10/09/1991EP0450128A1 Method for active noise suppression in stereo multiplex signals
10/09/1991EP0224556B1 Ensemble modem structure for imperfect transmission media
10/09/1991CN1055271A Controller for g3 type simplex radio facsimile
10/09/1991CN1014290B Circuit for suppression of local oscillator radiation of frequency modulated receiver
10/08/1991US5056153 Mobile electric accessory apparatus
10/08/1991US5056108 Communication system
10/08/1991US5055937 Remote controller for two VTR's
10/08/1991US5055924 Remote-controlled substitution of a defined program part of a tv program by a separately transmitted program part for defined, selected receivers, household terminal for executing the method and method for operating a household terminal
10/08/1991US5055800 Fractional n/m synthesis
10/08/1991US5055659 High speed system for reading and writing data from and into remote tags
10/08/1991CA1290398C Method and apparatus for isolating faults in an antenna system
10/08/1991CA1290255C Variable preemphasis/deemphasis network
10/07/1991WO1991016639A1 Integral modulation
10/07/1991CA2080024A1 Integral modulation
10/02/1991EP0449720A1 Bidirectional transmission active antenna
10/02/1991EP0449199A2 Noise reducing circuit
10/02/1991EP0448754A1 Two-wire-four-wire converter
10/02/1991EP0448753A1 Two-wire-four-wire converter
10/02/1991EP0448665A1 Digital receiver for band-spread signals.
10/02/1991EP0448662A1 System and method of transmitting and receiving a lincompex modulated signal over a communication channel utilizing frequency modulation techniques
10/02/1991EP0448618A1 Improvements to rds radio system.
10/02/1991CN2086022U Automatic receiver for fm broadcast
10/02/1991CN2086021U 多功能收音机 Multifunction Radio
10/02/1991CN1014199B Power conservation method and apparatus for portion of predetermined signal
10/01/1991US5054120 Receiver for personal radio paging service
10/01/1991US5054119 Anti-theft system for a radio receiver used particularly in a motor vehicle
10/01/1991US5054117 Tunable UHF filter for switchable VHF/UHF receiver
10/01/1991US5054115 Radio telephone apparatus
10/01/1991US5054114 Broadband RF transmit/receive switch
10/01/1991US5054112 Electronic data collection system
10/01/1991US5054075 Subband decoding method and apparatus
10/01/1991US5054051 Autodial from database in an electronic wristwatch
10/01/1991US5054022 Local communication bus system comprising a set of interconnected devices, a control bus, and a set of signal interconnections, and a device and a switchbox for use in such system
10/01/1991CA1290062C Data transmission system
10/01/1991CA1290027C Rf power amplifier protection
10/01/1991CA1290023C Housing structure for paging receiver
10/01/1991CA1290022C Two-way radio communications system having selectable operating modes
10/01/1991CA1290021C Trunked radio repeater system
09/1991
09/29/1991WO1991014952A1 Locating system
09/29/1991CA2039427A1 Paging receiver
09/28/1991CA2038811A1 Bidirectional active transmission antenna
09/26/1991DE4108714A1 Radio communication system e.g. for taxi, police or traffic news - allows messages to be digitised and stored in memory for playback
09/26/1991DE4008967A1 Communication system for colour television signals - switching and control functions can be operated or adjusted by several remote controls
09/25/1991EP0448318A2 Array antenna system structure
09/25/1991EP0447987A2 Method for synchronizing a wide area network without global synchronization
09/25/1991EP0447933A1 Communication system for color television signals
09/25/1991EP0447614A2 Antenna duplexer
09/25/1991EP0447495A1 Low time-delay transform coder, decoder, and encoder/decoder for high-quality audio.
09/25/1991EP0380475A4 Fm communications system with improved response to rayleigh-faded received signals
09/25/1991CN2085581U Automatic turn-off device for telecontrol electric appliance
09/25/1991CN1054866A Stability detection method and apparatus for tuning system
09/24/1991US5052050 Direct conversion FM receiver
09/24/1991US5052049 Paging receiver with continuously tunable antenna
09/24/1991US5052027 Programmable noise bandwidth reduction by means of digital averaging
09/24/1991US5052020 Method of and apparatus for controlling modulation of digital signals in frequency-modulated transmissions
09/24/1991US5051993 Mixed modulation level communication system
09/24/1991US5051991 Method and apparatus for efficient digital time delay compensation in compressed bandwidth signal processing
09/24/1991US5051979 Method and apparatus for errorless switching
09/24/1991US5051741 Locating system
09/24/1991US5051700 Feedback circuit for noiseless damping of the Q of an MRI receiver coil antenna
09/22/1991WO1991015068A1 Communication system using spread spectrum and leaky transmission line
09/21/1991WO1991015918A1 Full-duplex, sub-band spread spectrum communications system
09/19/1991WO1991014311A1 Zero if radio receiver for intermittent operation
09/19/1991DE4008657A1 Transportable radio telephone - uses disc shaped with handset cord retaining channel to improve portability
09/19/1991DE4008598A1 Key interface for mobile radio equipment - uses only two keys and time interval measurements in conjunction with speech circuitry
09/19/1991DE4008186A1 HF signals receiving circuitry for e.g. cable TV - uses variable capacitance diodes for tuning to VHF and UHF bands and conversion to IF
09/18/1991EP0447302A1 Time-multiplexed radio communication device
09/18/1991EP0447237A2 Frequency control in single sideband mobile radio systems
09/18/1991EP0447194A2 Radio receiver antenna arrangements
09/18/1991EP0446470A2 Noise reducing circuit
09/18/1991EP0446297A1 Two-way radio with voice storage
09/17/1991US5050238 Shielded front end receiver circuit with IF amplifier on an IC
09/17/1991US5050237 Radio receiver having automatic bandwidth control during tuning
09/17/1991US5050235 Transmitter using gallium arsenide FET with means for controlling gate bias voltage of the FET for suppressing undesired signal at a start condition of the transmitter
09/17/1991US5050217 Dynamic noise reduction and spectral restoration system
09/17/1991US5050192 Automatic gain control
09/17/1991US5049857 Multi-mode electronic article surveillance system
09/17/1991CA1289276C Optical fiber transmission apparatus, in particular for submarine use
09/17/1991CA1289196C Fmx stereophonic broadcaster receiver
09/12/1991DE4006362A1 Car radio adaptor for mains or battery operation - has inserter device in front housing with protective flap and plug connector system
09/11/1991EP0446050A2 Signal transmission/reception switching apparatus
09/11/1991EP0446037A2 Hybrid perceptual audio coding
09/11/1991EP0446031A2 Apparatus for encoding digital signals
09/11/1991EP0446024A2 Spread-spectrum communication system
09/11/1991EP0445887A2 Method of optimising the transmission of idle beacon messages in a communications system and a communications system operable in accordance with the method
09/11/1991EP0445885A1 Receiver with means for acquisition and comparison of identification data of two transmission channels
09/11/1991EP0394257A4 Low power digital receiver
09/11/1991EP0393089A4 Transponder
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