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)
01/1991
01/08/1991CA1278835C Demodulator including sweep controller for controlling synchronization capture range
01/02/1991EP0405922A2 Method of demodulation
01/02/1991EP0405676A2 Direct-conversion FSK receiver having a DC output independent of frequency drift
01/02/1991EP0405445A2 Output waveform control circuit
01/02/1991CA1278611C Phase controlled demodulator for digital communications system
01/02/1991CA1278610C Stepped square-qam demodulator utilizing all signal points to generate control signals
12/1990
12/27/1990WO1990016125A1 Direct conversion receiver for digital signals and method for demodulation of said signals
12/27/1990EP0404601A2 An automatic gain control system
12/27/1990EP0404462A2 Signal processing apparatus and method
12/27/1990EP0404054A2 Direct modulation phase-shift-keying system and method
12/27/1990CA1278347C Correlation detecting circuit operable in a low frequency
12/25/1990US4980898 Self-oscillating burst mode transmitter with integral number of periods
12/25/1990US4980897 Multi-channel trellis encoder/decoder
12/25/1990US4980767 Technique for determining signal dispersion characteristics in communications systems
12/25/1990US4980687 Digital demodulator
12/25/1990US4980648 Local oscillator signal phase acquisition system for digital demodulator
12/20/1990DE3919530A1 Digitally modulating digital signal - using phase shift keying and stored waveform principles with constant data rate
12/19/1990EP0403247A2 AGC device for producing a gain controlled and d.c. offset removed signal
12/19/1990EP0402918A2 Static image video telephone transmission and reception system
12/19/1990EP0152423B1 Maintenance response signalling arrangement for a digital transmission system
12/18/1990US4979211 Classifier for high speed voiceband digital data modem signals
12/18/1990CA1278062C2 Multipurpose digital integrated circuit for communication and control network
12/18/1990CA1278061C2 Multipurpose digital integrated circuit for communication and control network
12/14/1990WO1990016123A1 Modem capable of detecting out-of-frame synchronism condition
12/14/1990WO1990016117A1 System for removing circuit signal deterioration
12/12/1990EP0401557A2 Method to achieve optical heterodyne reception, insensitive to phase and/or polarization, for an FSK-modulated signal
12/11/1990US4977580 Timing and carrier recovery in TDMA without preamble sequence
12/11/1990CA1277715C Radio broadcast communications systems
12/05/1990EP0400854A2 Data centering method and apparatus
12/05/1990EP0400782A2 Offset correction
12/05/1990EP0400027A1 Method and apparatus for quadrature modulation.
12/05/1990CN1010733B Adaptive blind equalization method and device
12/05/1990CN1010732B Digital radio frequency receiver
12/04/1990US4975927 Demodulator with composite transversal equalizer and eye detection clock synchronizer
12/04/1990US4975654 Data signal discrimination method and apparatus
12/04/1990CA1277381C2 Multipurpose digital integrated circuit for communication and control network
11/1990
11/27/1990WO1990014727A1 Centering multi-level data
11/27/1990US4974236 Arrangement for generating an SSB signal
11/27/1990US4973977 Digital to amplitude modulated analog converter
11/27/1990CA2055470A1 Centering multi-level data
11/22/1990EP0398729A2 Processor modem
11/22/1990EP0398590A2 Modulator
11/21/1990CN1010540B Modem and data communication system
11/20/1990US4972440 Transmitter circuit for efficiently transmitting communication traffic via phase modulated carrier signals
11/20/1990US4972435 Frequency independent information transmission system
11/20/1990CA1276726C Error correcting coder/decoder
11/20/1990CA1276693C Demodulator
11/15/1990WO1990013958A1 Receiver for quadraphase modulation signals
11/15/1990DE3915779A1 Phase-shift keying signals identification system - using evaluation of statistical distribution of phase difference values obtained from sampled phase values of received signal
11/14/1990EP0397537A2 Mapping digital data sequences for data transmission
11/14/1990EP0397536A2 Apparatus for generating sequences of digital signals
11/14/1990EP0397535A2 Modem
11/14/1990EP0397094A2 Spread spectrum communication system
11/14/1990EP0397077A2 A system for interrupting a transmitter output wave
11/12/1990CA2014867A1 Generalized partial response channel signaling systems
11/07/1990EP0396049A2 Multi-carrier high speed modem
11/06/1990US4969163 Timing control for Modem receivers
11/06/1990US4968970 Method of and system for power line carrier communications
11/06/1990US4968955 For use in a receiver
11/02/1990CA2014354A1 Multi-carrier high speed modem
11/02/1990CA2013929A1 Demodulator for sampled data fm signals
10/1990
10/31/1990EP0395494A2 Method of and system for power line carrier communications
10/31/1990EP0395368A2 Quadrature phase demodulator capable of operating under a wide input dynamic range
10/31/1990EP0394895A1 Communication adapter for remote control terminal
10/31/1990DE3926201C1 Unit for demodulating binary FM signal on narrow band channel - obtains binary number by subtraction for uses as duration signal using counters
10/31/1990DE3915137C1 Circuit for data exchange in traffic - uses optical carrier wave with length of additional pulses adjusted to bandwidth of input circuit
10/30/1990US4967406 Subsignal transmitting system
10/30/1990US4967164 Adaptive predistortion circuit
10/25/1990DE4012527A1 Communications device for base band signals
10/24/1990EP0394064A2 Direct conversion receiver with dithering local carrier frequency for detecting transmitted carrier frequency
10/24/1990CN1046424A Frequency shift keying modulation and demodulation for serial communication on current loop
10/24/1990CN1046423A 解调电路 Demodulation circuit
10/23/1990USRE33404 Enhanced distance data transmission system
10/23/1990US4965866 Very low loss microwave modulator having two phase states O, π
10/23/1990US4965857 Method for synchronized polarization switching of an optical transmission signal of an optical transmission system having superheterodyne reception and an apparatus for the implementation of said method
10/23/1990US4965810 Digital differential phase-shift keyed decoder
10/23/1990US4965641 Processor modem
10/23/1990US4965536 Quadrature amplitude modulation system using digital filters
10/19/1990CA2014827A1 Baseband signal communication apparatus
10/18/1990WO1990012457A1 Frequency control apparatus and method for a digital radio receiver
10/18/1990DE3912497A1 Gleichzeitige energie- und datenrueckuebertragung ueber lose transformatorische kupplung Simultaneous energy and datenrueckuebertragung about loose coupling transformer
10/17/1990EP0392723A2 Data communications apparatus and method
10/17/1990EP0392647A2 Current loop arrangements with FSK
10/17/1990EP0392538A2 Quadrature amplitude modulation communication system with transparent error correction
10/17/1990CN1046251A Method and apparatus for reducing noise on signal encodable on plurality of predetermined levels
10/12/1990CA2013866A1 Frequency shift keying modulation and demodulation for serial communication on a current loop
10/11/1990DE3903944A1 Symbol clock and carrier phase synchronisation method for coherent digital signal receivers with multi-dimensional signal representation
10/10/1990EP0391354A2 Method of generalizing the Viterbi-algorithm and apparatus to carry out the method
10/10/1990CN1046074A Frequency control apparatus and method for digital radio receiver
10/10/1990CN1009986B Multi-stage transmitter aerial coupling device
10/09/1990USRE33380 Voiceband data set
10/09/1990US4962510 Phase modulated system with phase domain filtering
10/09/1990US4962496 Transmission of data via power lines
10/03/1990EP0390645A1 Method of/and device for noise reduction on a codable multi-predetermined level signal
10/03/1990EP0390609A2 Adjacent channel interference canceller with means for minimizing intersymbol interference
10/03/1990EP0390351A2 Method and apparatus for the demodulation of binary PSK signals
10/03/1990EP0389974A1 Frequency control apparatus and method for a digital radio receiver
10/03/1990CN1045902A Wave-form generator
10/02/1990US4961206 Data modem system
10/02/1990CA1274929A1 Method of communicating stuffing indications in a multi-level communications system
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