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)
11/1993
11/27/1993CA2096188A1 Adaptive efficient single/dual tone decoder apparatus and method for identifying call-progression signals
11/25/1993WO1993023941A1 Digital pulse detector
11/25/1993WO1993023928A1 Power line coupler modem device for communication over electrical lines
11/25/1993WO1993023921A1 Method and apparatus for amplifying, modulating and demodulating
11/25/1993CA2135304A1 Method and apparatus for amplifying modulating and demodulating
11/24/1993EP0571079A1 Discriminating and suppressing incoming signal noise
11/24/1993EP0571078A1 Apparatus and method for attenuating received noise signals
11/24/1993EP0571005A2 Method and apparatus for transmission and reception of a digital television signal using multicarrier modulation
11/24/1993EP0570979A1 Quadrature modulation circuit
11/24/1993CN1078838A Carrier recovery processor for a qam television signal
11/23/1993US5265151 Method of improving modem performance by controlling transmitted power of modem, and modem implementing the same
11/23/1993US5265127 Non-linear encoder and decoder for information transmission through non-linear channels
11/23/1993US5265120 Binary phase shift keying modulation system and/or frequency multiplier
11/23/1993US5265119 Method and apparatus for controlling transmission power in a CDMA cellular mobile telephone system
11/23/1993US5265105 Decoding circuit for inhibiting error propagation
11/23/1993US5265097 Data processor
11/23/1993US5264937 Apparatus for time division multiplexed processing of frequency division multiplexed signals
11/23/1993US5264805 For use in an FSK direct conversion system receiver
11/23/1993CA1324642C Modem for rf subscriber telephone system
11/18/1993EP0570216A2 Carrier recovery processor for a QAM television signal
11/18/1993EP0570210A2 System for controlling frequency multiplexing modems
11/18/1993EP0570097A1 Apparatus and robust method for detecting tones
11/18/1993EP0569523A1 High speed data detection and clock recovery in a received multi-level data signal
11/18/1993EP0553289A4 Digital audio broadcasting system
11/18/1993EP0328617B1 Phase demodulator and its application to an mls-type landing system
11/17/1993CN1022787C Method and apparatus for preprocessing and demodulating m-ary phase shift K eyed (psk) signals
11/16/1993US5263052 Viterbi equalizer for radio receiver
11/16/1993US5263051 Device and method of interleaving for a trellis precoding system
11/16/1993US5263046 Spread-spectrum chirp communication with sharply defined bandwidth
11/16/1993US5263026 Maximum likelihood sequence estimation based equalization within a mobile digital cellular receiver
11/16/1993US5263018 Apparatus for time division multiplexed processing of plural QAM signals
11/11/1993WO1993022861A1 Receiver for digital communication system
11/11/1993WO1993022854A1 Radio communication modem for receiving and estimating a transmitted symbol
11/11/1993WO1993022853A1 Optimum estimation of data and parameters for communication systems
11/11/1993WO1993022847A1 Modem-channel bank converter
11/11/1993CA2112221A1 Receiver for a digital communication system
11/10/1993EP0568939A2 FSK receiver
11/10/1993EP0462106B1 Continuous phase shift modulation system with improved spectrum control
11/09/1993US5261120 Method and apparatus for transmitting a signal with an offset which follows a received signal
11/09/1993US5260975 Digital demodulator
11/09/1993US5260973 For processing a baseband input signal and carrier signal
11/09/1993US5260673 π/4 differential encoding for digital cellular mobile systems
11/09/1993US5260671 Receiving circuit for demodulating an angle modulated signal
11/09/1993CA2005399C Double-stage phase-diversity receiver
11/09/1993CA2003580C Automatic frequency control in the presence of data
11/03/1993EP0568291A2 Digital signal processing apparatus with three modulation (TDM,FDM,CDM)sub-systems in parallel
11/03/1993EP0568056A1 Arrangement for correction of synchronous demodulator quadrature phase errors
11/03/1993EP0567650A1 Phase-modulation transmitter and receiver
11/03/1993EP0516741A4 Hybrid analog/digital signal processing
11/02/1993US5259005 Apparatus for and method of synchronizing a clock signal
11/02/1993US5259000 Modulator-demodulator apparatus and system
11/02/1993US5258987 Multilevel coding using trellis-coded modulation and reed-solomon codes
10/1993
10/28/1993WO1993021710A1 Coordinated coding for digital transmission
10/27/1993EP0566773A2 FSK modulation system
10/26/1993US5257415 Automatic transmission level control device
10/26/1993US5257309 Dual tone multifrequency signal detection and identification methods and apparatus
10/26/1993US5257293 Phase locked loop for extracting clock pulses through wave differential method
10/26/1993US5257291 Circuit for evaluating frequency difference
10/26/1993CA1323671C Vector modulation signal generator
10/21/1993DE4234336C1 Demodulator for FSK signals - uses multiphase filter with separate Fourier transformation network for each frequency shift frequency
10/20/1993EP0566331A2 Coded modulation using a combination of convolutional and block codes
10/20/1993EP0566330A2 Multilevel coding using trellis-coded modulation and reed-solomon codes
10/20/1993EP0566257A1 Method and apparatus for providing antenna diversity
10/20/1993EP0565659A1 Multichannel tdm communication system slot phase correction
10/20/1993EP0565652A1 Peak to average power ratio reduction methodology for qam communications systems
10/20/1993EP0557297A4 Method and apparatus for modulating and dectecting a subcarrier signal for an inductively coupled transponder
10/20/1993EP0538456A4 Receiver with signal classifier
10/19/1993US5255292 to prevent false-locking and accelerate acquisition
10/19/1993US5255290 Method and apparatus for combined frequency offset and timing offset estimation
10/19/1993US5255289 Symbol timing recovery circuit
10/19/1993US5255288 Arrangement for converting binary input signal into corresponding in-phase and quadrature phase signals
10/19/1993US5255269 Transmission of data by frequency modulation using gray code
10/19/1993US5255086 Method and apparatus for RF data transfer in a CATV system
10/19/1993US5254958 Phase-lock-loop circuit and method for compensating, data bias in the same
10/19/1993CA1323402C Method and apparatus for decoding a quadrature modulated signal
10/14/1993WO1993020658A1 Multiresolution digital television broadcast system
10/13/1993EP0565470A1 Method for transmission of digital radio-paging messages and radio-pager therefor
10/13/1993EP0565332A2 CCD delay line
10/13/1993EP0565229A2 Method and system for modem command processing during data transfer
10/13/1993EP0564850A1 A symmetrically balanced phase and amplitude base band processor for a quadrature receiver
10/13/1993EP0564702A2 Method of data transmission on telephone lines
10/13/1993EP0536390A4 Data bit to constellation symbol mapper
10/12/1993US5253272 Digital data transmission system with adaptive predistortion of transmitted pulses
10/12/1993US5253271 Method and apparatus for quadrature amplitude modulation of digital data using a finite state machine
10/12/1993US5253270 Apparatus useful in radio communication of digital data using minimal bandwidth
10/12/1993US5253250 Routing and switching of high-speed optical data with the header transmitted on a subcarrier frequency
10/12/1993US5253097 Demodulator and a polarization diversity receiver for coherent optical communication provided with the demodulator
10/12/1993CA1323104C Digital to amplitude modulated analog converter
10/11/1993WO1993021717A1 Radio frequency broadcasting systems and methods using two low-cost geosynchronous satellites
10/07/1993CA2090739A1 A symmetrically balanced phase and amplitude base band processor for a quadrature receiver
10/06/1993EP0564426A1 A method and arrangement for demodulating a frequency modulated signal
10/06/1993EP0564361A1 Demodulation apparatus for pi/4-QPSK signals
10/06/1993EP0564355A1 Photoreceiver for frequency-modulated optical signals
10/06/1993EP0564075A1 Continuous phase FSK modulated optical transmission system with local osciallator control
10/06/1993EP0563300A1 Apparatus and method for equalizing a corrupted signal in a receiver
10/06/1993EP0563252A1 Multi-modulation scheme compatible radio
10/06/1993CN1077072A 可变速度异步调制解调器 Variable-speed asynchronous modem
10/06/1993CN1077069A Apparatus and method for reducing message collision between mobile stations simultaneously accessing a base station in a cdma cellular communications system
10/05/1993US5251324 Method and apparatus for generating and collecting viewing statistics for remote terminals in a cable television system
10/05/1993US5251237 Receiver for a digital transmission system
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