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)
04/1983
04/12/1983US4380081 Digital receiver for four-phase-modulated carrier
04/12/1983US4380009 Message communication system
04/06/1983EP0076095A1 Direct conversion radio receiver for F.M. signals
04/06/1983EP0076008A1 A receiver for FFSK modulated data signals
04/05/1983US4379347 Receiver for PCM-encoded multifrequency dialing signals
04/05/1983US4379284 Coherent phase shift keyed demodulator for power line communication systems
04/05/1983US4379266 PSK Demodulator with automatic compensation of delay induced phase shifts
04/05/1983CA1144257A1 Coherent phase shift keyed demodulator for power line communication systems
03/1983
03/31/1983WO1983001167A1 Digital transmitter with vector component addressing
03/31/1983WO1983001166A1 Fsk voiceband modem using digital filters
03/31/1983WO1983001165A1 Data modem clock extraction circuit
03/31/1983WO1983001161A1 System for preventing transient induced errors in phase locked loop
03/31/1983WO1983001159A1 Zero-crossing interpolator to reduce isochronous distortion in a digital fsk modem
03/30/1983EP0075161A1 Switched-capacitor modulator
03/29/1983US4378526 Pulse code demodulator for frequency shift keyed data
03/23/1983EP0074848A2 Method and apparatus for data transmission using chirped frequency-shift-keying modulation
03/22/1983US4377791 Phase displacement modulator having four quadrant phases
03/22/1983CA1143445A1 Band-pass filter circuit
03/15/1983CA1143013A1 Receiver for frequency modulated signals having two quadrature channels
03/09/1983EP0073699A1 Frequency synthesizer with fractional division for use in digital angle modulation
03/08/1983US4376308 Control of coefficient drift for fractionally spaced equalizers
03/03/1983WO1983000783A1 Circuit for the suppression of the carrier
03/02/1983EP0073039A1 Equalizer having a substantially constant gain at a preselected frequency
03/01/1983CA1142280A1 Detector for multifrequency signals
02/1983
02/23/1983EP0072393A2 Digital frequency discriminator
02/16/1983EP0072241A2 Carrier recovery circuit
02/16/1983EP0071979A2 Signal receiving circuit for optical communication
02/09/1983EP0071514A1 Carrier wave recovery device
02/09/1983EP0071325A2 Method of and apparatus for demultiplexing a composite signal containing a plurality of data streams
02/08/1983US4373151 Stochastic demodulator for phase jump-modulated signals, operating in time divided up over several channels
02/03/1983WO1983000413A1 Apparatus for interconnecting data communication equipment and data terminal equipment
02/01/1983US4371839 Differentially coherent signal detector
02/01/1983CA1140635A1 Apparatus for generating constant-envelope, angle-modulated pulse signals
01/1983
01/26/1983EP0070695A2 Radio receiver for frequency shift keyed signals
01/26/1983EP0070287A1 High frequency communications.
01/26/1983EP0016783B1 Surface acoustic wave unique word detector and coherent demodulator
01/25/1983US4370748 Apparatus and method for detecting the presence of a pulsed radio frequency signal
01/25/1983US4370747 Data transmission
01/25/1983US4370650 Tone detection circuitry
01/25/1983CA1140216A1 Data modem false equilibrium circuit
01/18/1983US4369425 Voiced alerting system
01/11/1983US4368542 Phase canceller for carrier recovery network
01/11/1983US4368439 Frequency shift keying system
01/11/1983US4368434 Programmable digital detector for the demodulation of angle modulated electrical signals
12/1982
12/28/1982US4366547 Digital filter with scaled tap coefficients
12/22/1982EP0067395A2 Modem with low part
12/22/1982EP0067378A2 Constrained adaptive equalizer
12/21/1982US4365211 Phase-locked loop with initialization loop
12/21/1982US4365205 Demodulator for signal which is frequency modulated by digital data
12/21/1982CA1138058A1 Hybrid automatic gain control circuit
12/15/1982EP0067010A1 Methods for operation of programmable signal control circuits
12/15/1982EP0066839A1 A digital burst signal transmission system
12/14/1982CA1137632A1 Pulse code demodulator for frequency shift keyed data
12/14/1982CA1137573A1 Band pass filter circuit
12/14/1982CA1137571A1 Method of demodulating a quadphase coded data signal and receiver for carrying out the method
12/08/1982EP0066338A1 FM-broadcasting system with transmitter identification by means of a binary phase-modulated, differentially coded code signal
12/08/1982EP0066229A1 Method of and apparatus for demodulating FSK signals
12/08/1982EP0066076A1 Integrated circuit FSK modem
12/07/1982US4362997 Quadriphase differential demodulator
12/01/1982EP0065805A1 Receiver for angle-modulated carrier signals
12/01/1982EP0065764A2 Digital radio system
12/01/1982EP0065763A2 Arrangement for the fast detection of frequency-shift keying signals in a radio link
12/01/1982EP0065598A1 Improvements in telecommunication receivers
11/1982
11/30/1982US4361904 Method of testing transceiver and transceiver including testing apparatus
11/30/1982US4361894 Band-pass filter circuit
11/30/1982US4361817 Bi-phase modulator/demodulator
11/23/1982CA1136299A1 Multiplexed carrier transmission through harmonic polluted medium
11/23/1982CA1136220A1 Carrier transmission through harmonic polluted means
11/17/1982EP0064728A2 Multiple phase digital modulator
11/16/1982US4359692 Rapid acquisition shift keyed signal demodulator
11/16/1982US4359648 Pulse signal control circuits
11/16/1982CA1135801A1 Quadrature transposition stage
11/10/1982EP0064131A2 Digital modulation method
11/09/1982US4358853 Digital modem transmitter
11/08/1982EP0053629A4 Voiceband data set.
11/03/1982EP0063842A1 Carrier recovery device for a 16-state amplitude and phase modulation, and digital data receiving system using such a device
10/1982
10/28/1982WO1982003736A1 Circuits for producing an output waveform synchronized with the timing of a given waveform
10/27/1982EP0063414A2 Apparatus for coupling signals to or from a two-wire line
10/26/1982CA1134519A1 Transmitter and receiver for an orthogonally multiplexed qam signal of a sampling rate n times that of pam signals, comprising an n/2-point offset fourier transform processor
10/26/1982CA1134447A1 Data transmission system
10/19/1982US4355407 Device for disconnecting the receiver in case of a small signal-to-noise ratio for a digital-modulated radio system
10/19/1982US4355406 Carrier detector in a modem provided with an echo canceler
10/19/1982US4355405 Digital signalling system
10/19/1982US4355404 Carrier recovery network for QPSK modems employing synchronized oscillators
10/19/1982US4355402 Data modem false equilibrium circuit
10/19/1982US4355401 Radio transmitter/receiver for digital and analog communications system
10/19/1982US4355397 Full duplex communication system for voice grade channels
10/19/1982US4355303 Receiver for a distribution network power line carrier communication system
10/19/1982CA1134047A1 Device for measuring the quality of a digital radio link
10/19/1982CA1134046A1 Circuit for converting binary digital signals into pseudoternary a.c. pulses
10/13/1982EP0062442A2 Apparatus for coupling signals to or from a two-wire line
10/13/1982EP0062435A1 Means providing novel signal structures for QCM modulation
10/12/1982US4354248 Programmable multifrequency tone receiver
10/06/1982EP0061853A1 Tone detection circuitry
09/1982
09/28/1982US4352199 Method and device for detecting and interpreting a distress signal
09/28/1982US4352194 System and method for frequency discrimination
09/28/1982US4352192 Timing signal synchronization device
09/28/1982US4352071 Planar QPSK demodulator
09/21/1982US4351062 Method and apparatus for suppressing digital error noise in digital communication
09/21/1982US4351061 Method of phase synchronization in a synchronous data transmission system, and apparatus for carrying out the method
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