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)
09/1981
09/30/1981EP0036800A1 Device for linking a private telephone network to the public network
09/30/1981EP0036746A2 Method and apparatus for line isolation and interference shielding for a shielded conductor system
09/30/1981EP0036431A1 Transmitter having a phase-locked loop
09/29/1981US4292686 Tuning system for receiver of pilot-modulated carrier waves
09/29/1981US4292594 Method and apparatus for carrier regeneration and synchronous amplitude demodulation
09/29/1981US4292479 Separation and balance device for telephone exchanges
09/29/1981US4292467 Control for audio receiver
09/23/1981EP0036354A1 Device for the acquisition and for taking the mean value of samples of a noise affected periodic signal
09/22/1981US4291410 Multipath diversity spread spectrum receiver
09/22/1981US4291409 Spread spectrum communications method and apparatus
09/22/1981US4291290 UHF-VHF tuner having damping means to reduce interference in UHF band
09/22/1981CA1109525A1 Automatic modulation control apparatus
09/15/1981US4290144 Radio communications systems
09/15/1981US4289939 Longitudinal balance arrangements for two-to-four wire telecommunication line circuits
09/15/1981CA1109129A1 Electronic switching systems
09/09/1981EP0035257A1 Device for switching off a receiver at a small signal-to-noise ratio for a digital modulation radio system
09/09/1981EP0035166A1 Digital receiver
09/08/1981US4288868 Satellite communication system for speech and telegraphy
09/08/1981US4288820 Time-axis picture-signal converter for facsimile and the like
09/08/1981US4288753 Muting circuit with operational amplifier
09/08/1981CA1108708A1 Interleaved binary coded signal translation device
09/02/1981EP0034652A1 Mobile apparatus with a device for printing information
09/02/1981EP0034624A1 Housing for electronic apparatus with elastomer outer layer
09/01/1981US4287604 RF and IF Circuitry of an uplink receiver
09/01/1981US4287599 Multi-channel communication device with manual and automatic scanning electronic channel selection
09/01/1981US4287475 Circuit for the adaptive suppression of narrow band interference
09/01/1981CA1108328A1 Voltage controlled current sources for active hybrid circuit
09/01/1981CA1108327A1 Electronic hybrid and hybrid repeater with bridge circuit
09/01/1981CA1108262A1 Dual speed full duplex data transmission
08/1981
08/27/1981EP0029027A4 Antenna low-noise q spoiling circuit.
08/25/1981US4286335 Coaxial dual antenna connection arrangement for communications apparatus
08/25/1981US4286333 Data transmission
08/25/1981US4286290 Fast recovery squelch circuit for a video disc player
08/25/1981US4286262 Electronic transmitter device
08/25/1981US4286238 Harmonic filtering device for radio transmitter
08/25/1981US4286116 Device for the processing of voice signals
08/25/1981US4286114 Two-wire resistance bridges for private line circuits
08/20/1981WO1981002374A1 Modular stereophonic high fidelity installation
08/19/1981EP0033854A1 Control unit for a car radio
08/18/1981US4285066 Receiver having a search tuning circuit
08/18/1981US4285065 Radio with audio graphic equalizer
08/18/1981US4285060 Spread spectrum code tracking loop
08/18/1981US4284859 Adaptive electronic hybrid circuit
08/18/1981CA1107389A1 Television signal processing circuit including a trap circuit
08/12/1981EP0033390A1 Scanning radio receiver and transmitter
08/11/1981US4283795 Adaptive cross-polarization interference cancellation arrangements
08/11/1981US4283794 Measuring radio-frequency impedance
08/11/1981US4283793 Muting signal generation circuit for an FM receiver
08/11/1981CA1106919A1 Method and device for determining the phase intercept in a system employing phase-shift keying modulation
08/04/1981US4282603 Synthesizer tuner
08/04/1981US4282512 Data communication system
08/04/1981CA1106491A1 Muting circuit
07/1981
07/29/1981EP0032878A2 Radio receiver
07/29/1981EP0032598A1 Portable paging receiver with a shift register and a direct current converter
07/28/1981US4281414 Receiving channel number indication system for television receiver
07/28/1981US4281314 Selection switching apparatus
07/28/1981US4281295 Noise reducing apparatus
07/28/1981US4281219 Telephone line circuit
07/28/1981US4281217 Apparatus and method for the identification of specially encoded FM stereophonic broadcasts
07/28/1981CA1106055A1 Method for transmitting a facsimile signal by sequential edge differential coding
07/28/1981CA1106000A1 Selective call radio communication receiver
07/22/1981EP0032330A1 Subharmonic mixer for millimeter wave receiver, and receiver using such a mixer
07/22/1981EP0032328A1 Method and apparatus for initiating the protection of a line of a digital transmission trunk
07/22/1981EP0032327A2 Process and apparatus for protecting a digital transmission trunk
07/22/1981EP0032276A1 Signal Processing Apparatus
07/21/1981US4280139 Muting circuit for a television receiver
07/21/1981US4280113 Filter for microwaves
07/21/1981US4280101 Stereophonic signal demodulation circuit
07/21/1981CA1105575A1 Amplitude and frequency modulation system
07/14/1981US4279034 Digital communication system fault isolation circuit
07/14/1981US4279018 PN Lock indicator for dithered PN code tracking loop
07/14/1981US4278951 Solid-state millimeter wave source comprising a directive antenna
07/14/1981US4278848 Automatically adjustable bidirectional-to-unidirectional transmission network
07/14/1981US4278847 Transformerless hybrid circuits
07/14/1981CA1105090A1 Apparatus and method for frequency channel selection in a radiotelephone system
07/09/1981WO1981001932A1 Communication control device in a duplex transmission network
07/09/1981WO1981001931A1 Radio-receiver and/or radio-transmitter station
07/09/1981WO1981001930A1 Interfering-wave elimination device
07/09/1981WO1981001916A1 Input coupling device for a receiver
07/08/1981EP0031746A2 Circuit for the demodulation of a signal modulated by digital information and receiver comprising such a circuit
06/1981
06/30/1981US4276653 Device for receiving radio call messages
06/30/1981US4276638 Frequency multiplexed radio link apparatus
06/30/1981EP0023223A4 Modified vestigial side band transmission system.
06/30/1981CA1104212A1 Fm stereophonic receiver having muting and mode changing
06/30/1981CA1104061A1 Apparatus and method for peak-limiting audio frequency signals
06/24/1981EP0030874A1 Distortion reducing circuit for an FM receiver
06/23/1981US4275397 Interference canceling random access discrete address multiple access system
06/23/1981US4275369 Filter for microwaves
06/23/1981US4275276 Automatically adjustable bidirectional-to-unidirectional transmission network
06/23/1981US4275270 Speech detector for use in an adaptive hybrid circuit
06/23/1981CA1103785A1 Garage door opener
06/23/1981CA1103587A1 Narrow band transmission system and method
06/16/1981US4274082 Transmission system for the digital control of devices
06/16/1981CA1103355A1 Method for digital ru-length coding with redundance reduction for transmission of binarily coded picture informations
06/09/1981US4272846 Method for cancelling impulsive noise
06/09/1981US4272656 Quasi-resistive battery feed for telephone circuits
06/09/1981CA1102882A2 Wired broadcasting systems
06/03/1981EP0029490A1 Method of converting linear-coded digital signals into non-linear coded digital signals according to a multiple segment characteristic responding to the A law or the mu law
06/02/1981US4271535 Noise eliminating system
06/02/1981US4271534 Microwave receiver
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