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)
03/1991
03/26/1991US5003552 Carrier aided code tracking loop
03/26/1991CA2025085A1 Multi-system am stereo receiver having preferred mode of operation
03/26/1991CA1282167C Low distortion filters for separating frequency or phase modulated signals from composite signals
03/26/1991CA1282120C Fm receiver
03/21/1991WO1991003883A1 Improved low power dsp squelch
03/21/1991WO1991003882A1 Image canceling mixer circuit on an integrated circuit chip
03/21/1991DE4017418A1 Double tuner type radio receiver - has two oscillators selectively coupled to phase detector, filter, smoothing circuit and divider to form two PLL-circuits
03/21/1991DE3929793A1 Automatic switching system for parallel duplex communication channels - monitors signals received from each channel at each communication device
03/20/1991EP0418149A2 Microcomputer controlled synthesizer-type radio receiver
03/20/1991EP0418036A2 Audible noise reducing
03/20/1991EP0417913A2 Television receiver with circuits for recovering two audio signals
03/20/1991EP0417807A2 Remote control unit
03/20/1991EP0417682A1 Transponder used for positioning of a satellite
03/20/1991EP0417148A1 Fm radio reception unit.
03/20/1991EP0417147A1 Fm radio receptor unit.
03/20/1991CN2073637U Radio & hearing aid convertible amplifier
03/20/1991CN2073632U Network device of antenna feeding source
03/20/1991CN1050116A Digital transmission system using subband coding of digital signal
03/20/1991CN1012119B Design method and apparatus of single frequency duplexer communication system
03/19/1991US5001779 Mounting arrangement for motorcycle stereo system
03/19/1991US5001778 Portable radio receiver
03/19/1991US5001776 In a two-way radio frequency
03/19/1991US5001773 Local oscillator feedthru cancellation circuit
03/19/1991US5001772 Power pack with concealed radio transmitter for portable cellular telephone
03/19/1991US5001757 FM stereo tone detector
03/19/1991US5001723 Sinusoidal M-ary orthogonal keyed decoding
03/19/1991CA1281778C Fm receiver with improved response to rayleigh faded companded signals
03/19/1991CA1281777C Detachable battery pack with a built-in broadband antenna
03/15/1991CA2025240A1 Satellite position-fixing transponder
03/14/1991DE4021482A1 Display and operational command control - has numerous service keys near display for number of audio signal units of different functions
03/14/1991DE3929824A1 Two-band frequency converter for SHF range - has preamplifier, diplexer with filter function and local oscillator in two frequency branches
03/14/1991DE3918131A1 Receiver for coded EM pulse transmissions
03/13/1991EP0416622A2 Predistorter for linearization of electronic and optical signals
03/13/1991EP0416613A2 Transmission power control circuit
03/13/1991EP0416476A2 Circuit for connecting plural mutual decoupled frequency hopping transmitters to an antenna
03/12/1991US4999516 Combined bias supply power shut-off circuit
03/12/1991CA2025012A1 Audible noise reducing
03/08/1991CA2023568A1 Circuit arrangement for connecting two or more frequency-hopping transmitters to an antenna in a manner providing isolation between the transmitters
03/07/1991WO1991003109A1 A method for the contactless transmission of information
03/07/1991WO1991003107A1 System and method of transmitting and receiving a lincompex modulated signal over a communication channel utilizing frequency modulation techniques
03/06/1991EP0415897A1 A method of reducing the power requirements in a mobile radio receiver
03/06/1991EP0415867A1 Syringe-needle system for injections for a unique use
03/06/1991EP0415703A1 Antenna system for portable radio apparatus
03/06/1991EP0415610A2 Radio receiver
03/06/1991EP0414838A1 Process for transmitting a signal.
03/05/1991US4998292 Programming method and/or equipment for audio or video appliances
03/05/1991US4998289 Signal integrity control technique for an RF communication system
03/05/1991US4998261 Spread spectrum signal demodulator
03/05/1991US4998110 Power stabilizer and isolation/coupler network
03/05/1991CA1281080C Digital zero-if selectivity section
03/01/1991WO1991003884A1 Battery saver for a tdm system
02/1991
02/28/1991DE3928239A1 Data transmission system for remote control - has central control point with interface distributing remote control signals to controlled electronic devices
02/28/1991DE3928191A1 Electronic central amplifier of HI=FI system - identifies input signal signal source for preamplifier to allow automatic switching
02/28/1991DE3928145A1 Car radio with stored setting variables - uses entered input code to access different sets of stored values
02/27/1991EP0414524A2 Multiple zone audio system
02/27/1991EP0414122A2 City call-receiver
02/27/1991EP0414121A2 Car radio
02/27/1991EP0414114A1 Receiver circuit
02/27/1991EP0413805A1 Battery housing.
02/27/1991CN2072299U Am.fm radio-dialogue apparatus
02/27/1991CN2072298U Radio telecontrolled voltage-regulating switch
02/27/1991CN1049588A Receiver with variable predetection bandwidth based on expected date rate
02/27/1991CN1049584A Method of subcarrier multiplication which preserves am information in fm systems
02/27/1991CN1049581A Subscriber unit for wireless digital subscriber communication system
02/27/1991CN1049449A Torch-like blind man's guider with scale lanquage
02/26/1991WO1991003108A1 Gain/phase compensation for linear amplifier feedback loop
02/26/1991US4996717 Radio receiver noise squelching and operational indicating alarm
02/26/1991US4996715 Cellular
02/26/1991US4996697 Deglitching means for digital communication systems
02/26/1991US4996525 R. F. lockout circuit for electronic locking system
02/25/1991CA2023455A1 Multiple zone audio system
02/21/1991WO1991002414A1 Duplex radio apparatus
02/21/1991DE3926984A1 Car radio and cassette player - monitors radio stations enabling automatic over riding of cassette player
02/20/1991EP0413646A1 A gain control device for a video monitor
02/20/1991EP0413474A2 Pilot cancellation circuit
02/20/1991EP0413472A2 Switched capacitor pilot phase or magnitude detector
02/20/1991EP0413355A2 Vehicular power booster circuitry for multi-level portable transceiver
02/20/1991EP0151616B1 Control signalling arrangement for a digital transmission system
02/20/1991CN2071851U Fm and vhf sound general tuner
02/20/1991CN1049436A Interface for tv-vcr system
02/20/1991CN1049432A Transmission system
02/19/1991US4995099 Power conservation method and apparatus for a portion of a predetermined signal
02/19/1991US4995098 Adaptive scanning method
02/19/1991US4995055 Time shared very small aperture satellite terminals
02/19/1991US4995052 Demodulation method
02/19/1991US4994802 Subscriber unit for wireless digital telephone system
02/19/1991US4994769 SSB modulation and demodulation apparatus
02/19/1991CA1280467C Apparatus and method for decoding an am stereo broadcasting signalof an independent sideband system
02/14/1991DE4025466A1 RF transmitter-receiver for mobile telecommunication system - has signals processed via pin diode unit to improve sensitivity and power
02/13/1991EP0412852A2 Portable radio transceiver system having improved adaptor for transceiver and/or improved receive signal control arrangement
02/13/1991EP0412830A2 Apparatus and method for reduction of intermodulation distortion in an optical fiber network
02/13/1991EP0412583A2 Method and apparatus for controlling a TDM communication device
02/13/1991EP0412462A2 Audio/video apparatus with foldable flat screen
02/13/1991EP0412426A2 Self-oscillating burst mode transmitter with integral number of periods
02/13/1991EP0412421A2 Self-oscillating transmitter
02/12/1991US4993044 Spread-spectrum communication receiver
02/12/1991US4992873 Video signal noise reduction apparatus using amplitude companding and predictive signal processing techniques
02/12/1991US4992794 Transponder and method for the production thereof
02/12/1991US4992754 Predistorter for linearization of electronic and optical signals
02/12/1991CA1280171C Portable wireless communication apparatus
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