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)
12/1991
12/04/1991CN1015030B Method and circuit for suppressing data channel attach interference
12/03/1991US5070500 Memory package system utilizing inductive coupling between memory module and read/write unit
12/03/1991US5070309 RF power amplifier having improved amplifier protection
12/03/1991US5070303 Logarithmic amplifier/detector delay compensation
12/03/1991CA1292782C Automobile shaped miniature radio set
12/03/1991CA1292779C Method and apparatus for infrequent radio users to simply obtain emergency assistance
11/1991
11/28/1991WO1991018492A1 Transceiver mounting assembly having integrally formed lock
11/28/1991WO1991018450A1 Method for assigning channel reuse levels in a multi-level cellular system
11/27/1991EP0458645A2 Subband digital signal encoding apparatus
11/27/1991EP0458592A2 Passive cellular telephone antenna system
11/27/1991EP0458158A2 Method for assigning channel reuse levels in a multi-level cellular system
11/27/1991EP0457964A1 Remote control device, in particular for controlling motor vehicle accessories
11/27/1991EP0457934A1 Circuit arrangement for band switching in tuners
11/27/1991EP0457932A1 Circuit arrangement for band switching in tuners
11/26/1991US5068918 Receiver for terrestrial am and satellite fm-tv broadcasting signals
11/26/1991US5068917 Portable radio transceiver
11/26/1991US5068899 Transmission of wideband speech signals
11/26/1991US5068898 Voice messaging method for selective call receivers
11/26/1991US5068896 Stereo receiver
11/26/1991US5068544 Fsk data waveform shaping circuit
11/26/1991CA2043133A1 Digital signal encoding device
11/26/1991CA1292589C Signal compression circuit, particularly for a telephone set
11/26/1991CA1292560C High voltage regulator in a television apparatus
11/26/1991CA1292517C Digital fm squelch detector
11/26/1991CA1292515C Radio with digitally controlled audio processor
11/26/1991CA1292514C Mechanical fastening system for an electronic equipment housing
11/21/1991EP0457673A2 Signal transmission system for a home network
11/21/1991EP0457542A2 Transceiver with Doppler correction
11/21/1991EP0457448A1 Receiver systems
11/21/1991EP0457391A1 Encoding method and encoding system comprising a subband coder, and a transmitter comprising an encoding system
11/21/1991EP0457390A1 Encoding system comprising a subband coder, and a transmitter comprising an encoding system
11/20/1991CN1014854B Portable radio apparatus
11/19/1991US5067157 Noise reduction apparatus in an FM stereo tuner
11/19/1991US5067136 Wireless alarm system
11/19/1991CA1292275C Transceiver battery charging apparatus and method
11/19/1991CA1292206C Brief case with a portable wireless telephone
11/14/1991WO1991017617A1 Speech-transmission system
11/14/1991DE4033407C1 Electronic control for audio appts. in motor vehicles - comprises push buttons for setting levels and generating confirmation audio signal
11/14/1991DE4014132A1 Sprachuebertragungssystem Sprachuebertragungssystem
11/13/1991EP0456568A2 Method for transmitting a digitally coded message and transmission system
11/13/1991EP0455974A2 Control circuit for a superheterodyne receiver
11/13/1991EP0455738A1 Low bit rate transform coder, decoder and encoder/decoder for high-quality audio.
11/13/1991EP0389559A4 Moldable/foldable radio housing
11/13/1991CN2088762U 立式双工器 Vertical diplexer
11/13/1991CN1014756B Driver circuit for driving light emitting element
11/12/1991US5065451 System and method of frequency calibration in a linked compression-expansion (lincompex) system
11/12/1991US5065423 Paging system with registration mode
11/12/1991US5065411 Diversity receiving system for use in digital radio communication with means for selecting branch by estimating propagation path property
11/12/1991US5065408 Fractional-division synthesizer for a voice/data communications systems
11/12/1991US5065235 CATV terminal unit including memory for storing remote control codes relating to an external apparatus
11/12/1991US5065107 Phase-locked loop bandwidth switching demodulator for suppressed carrier signals
11/07/1991DE4111705A1 Sound signal modulation system for audio system - enables CD player to be played back through FM tuner without additional playback device
11/07/1991DE4014250A1 Casing establishing electric plug-in connection for car radio - provides contacts on frame for plug and pins via PCB
11/06/1991EP0455549A2 A signal transmission system for remote control of electronic apparatus
11/06/1991EP0455388A2 Receiver
11/06/1991EP0455252A2 A radio unit for a telephone set
11/06/1991EP0455046A2 High speed automatic frequency tuning method
11/06/1991EP0454913A1 Compensating for distortion in a communication channel
11/06/1991EP0454694A1 Reactance buffered loop antenna and method for making the same.
11/06/1991CN1056026A Noise-reducing receiving circuit
11/05/1991US5063611 Theft-protected vehicular accessory apparatus, particularly car radio and audio equipment
11/05/1991US5063572 Channelized delay and mix chip rate detector
11/05/1991US5063571 Method and apparatus for increasing the data rate for a given symbol rate in a spread spectrum system
10/1991
10/31/1991WO1991017605A1 Fractional n/m synthesis
10/31/1991WO1991016769A1 Adaptive-block-length, adaptive-transform, and adaptive-window transform coder, decoder, and encoder/decoder for high-quality audio
10/31/1991WO1991016768A1 Receiver for satellite reception
10/31/1991WO1991016767A1 Radio sensitivity enhancer
10/31/1991DE4013885A1 Complex impedance model for 2-wire 4-wire interface
10/30/1991EP0454266A2 Receiver comprising a circuit for estimating frequency offset
10/30/1991EP0454192A1 Transmission network for transmitting signals, comprising nodes and transmission sections with backup capacity
10/30/1991EP0454036A1 Method and device for going back to a normal connection after the use of a help connection in a data transmission system
10/30/1991CN2087843U Intercommunication set capable of making transmission by use of wired broadcasting line
10/30/1991CN1055852A Secodary transmitting receiving system for tv accompanying sound
10/30/1991CN1055830A Adaptive-block-lenght, adaptive-transform, and adaptive-window transform coder, decoder, and encoder/decoder for high-quality audio
10/29/1991US5062149 Millimeter wave device and method of making
10/29/1991US5062121 Spread spectrum communication device
10/29/1991CA1291537C2 Portable communications receiver with separated information presentation means and improved battery saving function
10/28/1991WO1991017606A1 Digital automatic gain control
10/27/1991WO1991016759A1 Fractional-division synthesizer for a voice/data communications system
10/23/1991EP0453282A2 Digital subband encoding apparatus
10/23/1991EP0453213A2 Reducing interference in R.F. signals
10/23/1991CN2087401U Radio set with luminous needle and disk
10/22/1991US5060310 Apparatus and method for reduction of intermodulation distortion in an optical fiber network
10/22/1991US5060300 Receiver switchable between network supply mode and power-conserving battery supply mode
10/22/1991US5060298 Monolithic double balanced mixer with high third order intercept point employing an active distributed balun
10/22/1991US5060297 TVRO receiver system with tracking filter for rejection of image frequencies
10/22/1991US5060294 Dual mode power amplifier for radiotelephone
10/22/1991US5060293 Antenna switch for transmit-receive operation using relays and diodes
10/22/1991US5060180 Programmable digital loop filter
10/22/1991US5059836 Differential-time-constant bandpass filter using the analog properties of digital circuits
10/22/1991CA1291218C Analog/digital data storage system
10/17/1991WO1991015920A1 Interconnection and control of multiple audio and video media devices
10/17/1991WO1991015912A1 Radio communication system using spread spectrum techniques
10/17/1991WO1991015911A1 Communication system
10/17/1991WO1991015902A1 Assistive listening device
10/17/1991DE4039117A1 Automatic station selection process for RDS preselect receiver - using stored list of alternative network frequencies to initiate follow-up tuning sequence if required
10/17/1991DE4011238A1 Data transmission system with controlled transmission characteristic - uses linear and nonlinear digital filters inserted in transmission path
10/16/1991EP0452011A2 Hand-held transceiver as a modular unit
10/16/1991EP0451885A1 Audio or video apparatus with in-built loud-speaker
10/16/1991EP0451369A1 Vehicle communication control
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