Patents
Sitemap › H04 - Electric communication technique › H04L - Transmission of digital information, e.g. telegraphic communication › H04L 27 - Modulated-carrier systems
Patents for H04L 27 - Modulated-carrier systems (89,721)
12/1989
12/13/1989EP0345282A1 Spectrally efficient digital modulation method and apparatus.
12/13/1989CN1038004A Data transmission method and apparatus by period shift keying (tsk)
12/13/1989CN1038003A Method and apparatus for encoding and decoding information signal
12/12/1989US4887314 Optical FSK demodulator
12/12/1989US4887050 Frequency control apparatus and method for a digital radio receiver
12/12/1989US4887044 Pulse counter type demodulator
12/12/1989US4887042 High speed multi-channel phase detector
12/12/1989CA1263900A1 Subscriber unit for wireless digital telephone system
12/06/1989EP0344678A2 Modulating device for a digital radio communications system
12/06/1989EP0344213A1 Viterbi decoder with reduced number of data move operations.
12/05/1989US4885756 Method of demodulating digitally modulated signals, and apparatus implementing such a method
12/05/1989US4885749 Data transmission with improved message format
12/05/1989CA1263771A1 Carrier wave recovery system
12/05/1989CA1263717A1 Modulation detector and classifier
11/1989
11/30/1989DE3817129A1 Method for transmitting 2 or more channels with an alternating current and/or frequency reduction of an alternating coding current
11/30/1989DE3816735A1 Method for transmitting 2 or more channels with an alternating current and/or frequency reduction of an alternating coding current
11/29/1989EP0343273A1 Correction circuit for a pair of digital quadrature signals
11/28/1989US4884285 (DS) transmitter
11/28/1989US4884139 Method of digital sound broadcasting in television channels with spectrum interlacing
11/21/1989US4882737 Signal transmission method
11/21/1989US4882733 Method and apparatus for combining encoding and modulation
11/21/1989US4882552 Coherent frequency exchange keying modulator
11/21/1989CA1263189A1 Automatic level control circuit for an ad converter
11/15/1989EP0341256A1 Modem and method using multidimensional coded modulation.
11/15/1989EP0341238A1 Automatic antenna tuning system for portable communication devices.
11/15/1989EP0116625B1 Multiple simultaneous tone decoder
11/14/1989US4881246 Method and apparatus for demodulating a class of M-ary phase shift keyed (PSK) signals
11/14/1989US4881245 Improved signalling method and apparatus
11/14/1989US4881241 Method and installation for digital communication, particularly between and toward moving vehicles
11/14/1989US4881240 AM equalizer circuit for digital systems
11/14/1989US4881222 Multicarrier demodulator
11/14/1989US4881049 QAM modulator/demodulator
11/08/1989EP0340978A2 Modulator/demodulator apparatus
11/07/1989US4879756 Radio broadcast communication systems
11/07/1989US4879729 Apparatus for the decoding coded frequency modulated signals
11/07/1989US4879728 DPSK carrier acquisition and tracking arrangement
11/02/1989WO1989010661A1 Spectrally efficient method for communicating an information signal
11/02/1989WO1989010658A1 Data transmission method and apparatus by period shift keying (tsk)
11/02/1989EP0340014A2 Adaptive multiharmonic phase jitter compensation
11/02/1989DE3808976A1 Reception method and coherent receiver for continuous phase modulation (CPM) with a reduced dimension number
10/1989
10/31/1989US4878228 Microwave relay station having a common standby channel for signals of different types of modulation
10/31/1989US4878035 Hybrid frequency shift keying modulator and method
10/31/1989US4878029 Complex digital sampling converter for demodulator
10/24/1989US4876737 Satellite data transmission and receiving station
10/24/1989US4876489 Signal processing
10/18/1989EP0337757A1 Endoprostheses with bone resorption preventing means
10/18/1989EP0337671A2 Signal transmission system for machine tools, inspection machines, and the like
10/18/1989EP0337670A2 Signal transmission system for machine tools, inspection machines, and the like
10/18/1989EP0337669A2 Signal transmission system for machine tools, inspection machines, and the like
10/17/1989US4875049 Automatic level control circuit for an ad convertor
10/12/1989DE3909807A1 Remote control
10/11/1989EP0336832A1 Asynchronous digital correlator and demodulators comprising such a correlator
10/11/1989EP0336726A2 Branch metric algorithm for eight-dimensional signal constellation
10/10/1989US4873701 Modem and method for 8 dimensional trellis code modulation
10/10/1989US4873683 TDMA radio system employing BPSK synchronization for QPSK signals subject to random phase variation and multipath fading
10/10/1989US4873500 Phase accumulation continuous phase modulator
10/10/1989CA1262266A1 Demodulation system capable of establishing synchronization in a transient state
10/04/1989EP0335346A2 Digital signal magnetic recording and playback apparatus employing quadrature amplitude modulation
10/04/1989EP0335284A2 Phase to digital conversion method and arrangement for carrying out the method
10/04/1989EP0334868A1 Digital signal coding.
10/04/1989EP0334867A1 Duplex data transmission.
10/03/1989US4871987 FSK or am modulator with digital waveform shaping
10/03/1989US4871975 Carrier recovery circuit for offset QPSK demodulators
10/03/1989US4871974 Coherent phase shift keyed demodulator
10/03/1989US4871973 Demodulator including sweep controller for controlling synchronization capture range
09/1989
09/27/1989EP0334587A2 Signal processing system
09/27/1989EP0334549A2 Method and apparatus for wideband transmission of digital signals between a telephone central office and customer premises
09/26/1989US4870660 Variable frequency rate receiver
09/26/1989US4870659 FSK demodulation circuit
09/26/1989CA1261980A1 Signal processing system
09/26/1989CA1261928A1 Decision timing control circuit
09/26/1989CA1261924A1 Digital zero if circuit
09/26/1989CA1261398A1 Method and apparatus for the transmission of binary data signals by frequency shift keying
09/26/1989CA1261397A1 Method for the transmission of digital data
09/26/1989CA1260641A1 (ds) transmitter
09/26/1989CA1260564A1 Quadrature amplitude modulation/demodulation device using multi-level digital signals
09/20/1989EP0333387A2 Squaring circuits in mos integrated circuit technology
09/20/1989EP0333044A1 Synchronisation device for offset quadrature phase-shift keying
09/19/1989US4868896 Optical superheterodyne receiver for, in particular, phase-shift modulated light
09/19/1989US4868864 Autocorrelating 2400 bps handshake sequence detector
09/19/1989US4868863 Apparatus for connecting data processing equipment to a communication network
09/19/1989US4868850 MODEM communication system having training means and method for training same
09/19/1989US4868810 Multi-stage transmitter aerial coupling device
09/13/1989EP0332302A2 Phase perturbation compensation system
09/13/1989EP0332290A2 Equaliser for radio receiver
09/13/1989EP0332087A1 Frequency modulator
09/13/1989CN1035597A Digital dqpsk circuit
09/12/1989USRE33056 Signal structures for double side band-quadrature carrier modulation
09/12/1989US4866771 Signaling system
09/12/1989US4866739 Digital fast recovery timing algorithm
09/12/1989US4866734 Receiver for spread spectrum communication
09/12/1989US4866647 Continuously variable digital delay circuit
09/12/1989US4866449 Multichannel alignment system
09/12/1989US4866395 Universal carrier recovery and data detection for digital communication systems
09/08/1989WO1989008360A1 An adaptive detection method for quantized signals
09/08/1989WO1989008356A1 Method and apparatus for modulating a semiconductor laser
09/05/1989US4864591 Facsimile signal modulation detector
09/05/1989US4864244 Stepped square-QAM demodulator utilizing all signal points to generate control signals
08/1989
08/31/1989DE3805263A1 Method for transmitting information on the basis of quadrature amplitude modulation
08/29/1989US4862516 System for automatically tuning the antenna of a miniature portable communications device
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