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)
11/1980
11/25/1980US4236248 Transmission speed switching system
11/18/1980US4234957 Method and apparatus for generating timing phase error signals in PSK demodulators
11/18/1980US4234870 Vital electronic code generator
11/18/1980US4234852 Coherent frequency shift key demodulator
11/11/1980US4233565 Method and apparatus for a PSK signal detector
11/04/1980US4232318 Duplex microwave radio communication system
11/04/1980CA1089028A1 Filter and demodulation arrangement
11/04/1980CA1089021A1 Arrangement for compensating carrier phase errors in a receiver for discrete data values
10/1980
10/29/1980EP0018242A1 Method and device for stochastic demodulation of phase-shift keyed signals working in time division on several channels
10/29/1980EP0017716A1 Method for initializing an adaptive equalizer starting from an unknown data signal in a transmission system using a double side band modulation with quadrature carriers
10/28/1980US4231094 Method and device for determining the phase intercept in a system employing phase-shift keying modulation
10/28/1980US4231018 Tone signal detector
10/28/1980US4230903 Data transmission system
10/28/1980CA1088638A1 Frequency selective detector circuit
10/28/1980CA1088629A1 Phase-jump detector and corrector method and apparatus for phase-modulated communication systems that also provides a signal quality indication
10/21/1980US4229821 System for data transmission by means of an angle-modulated carrier of constant amplitude
10/21/1980US4229819 Data transmission system
10/21/1980US4229698 Tuning indicator
10/15/1980EP0017301A1 Frequency shift modulator
10/15/1980EP0017130A1 Receiver for high-frequency, electromagnetic waves with frequency adjustment
10/15/1980EP0016783A1 Surface acoustic wave unique word detector and coherent demodulator.
10/14/1980CA1087736A1 Statistical data detection method and apparatus
10/14/1980CA1087703A1 Multi-channel signal decoder
10/09/1980EP0016783A4 Surface acoustic wave unique word detector and coherent demodulator.
10/07/1980US4227255 Signal classifier
10/07/1980US4227252 Method and device for acquiring the initial phase of the clock in a synchronous data receiver
10/07/1980US4227152 Method and device for training an adaptive equalizer by means of an unknown data signal in a quadrature amplitude modulation transmission system
10/07/1980US4227055 Multifrequency receiver
10/07/1980CA1087318A2 Process for receiving unique words
10/07/1980CA1087317A2 Process for receiving unique words
10/01/1980EP0016281A1 A data carrier system, especially a subscriber/digital data carrier system, and a frequency synthesizer suitable therefor
10/01/1980EP0016256A1 Circuit arrangement for correcting the step distortions during the transmission of data with frequency modulation
09/1980
09/30/1980US4225969 Method and apparatus for testing a frequency synthesizer in an RF modem
09/30/1980US4225964 Detection means for providing multiple baud values per individual baud period of a carrier signal to obviate baud timing ambiguities
09/23/1980US4224575 Phase/frequency controlled phase shift keyed signal carrier reconstruction circuit
09/17/1980EP0015730A1 A data transmission system, and a method of passing data through a data transmission system
09/16/1980US4223404 Apparatus for recycling complete cycles of a stored periodic signal
09/16/1980US4223326 Method and device for reducing the probability of loss of a character in a digital transmission employing biphase coding
09/09/1980US4222035 Multiplex system having digital coded power line signals
09/04/1980WO1980001863A1 Coefficient tap leakage for fractionally-spaced equalizers
09/02/1980CA1085003A1 Carrier synchronization system for coherent phase demodulators
08/1980
08/26/1980CA1084590A1 Selective intermodulation distortion measurement
08/20/1980EP0014505A1 Device testing system provided with an echo suppressor
08/20/1980EP0014244A1 Method and device for testing a frequency synthesizer in a HF modem
08/19/1980US4218769 Means for subdividing a baud period into multiple integration intervals to enhance digital message detection
08/19/1980CA1084126A1 High-speed tone decoder utilizing a phase-locked loop
08/12/1980US4217551 Phase modulated data transmission system
08/12/1980US4217467 Amplitude and periodic phase modulation transmission system
08/12/1980CA1083720A1 Correlative converter between a 2.sup.n-ary code sequence and a 2 sun 1 xx-phase carrier pulse sequence
08/12/1980CA1083678A1 Carrier wave recovery circuit
08/07/1980WO1980001631A1 Process and device for detecting and interpreting a distress signal
08/06/1980EP0013857A1 Demodulation device for a frequency shift modulated analog signal
08/05/1980US4216543 Means for deriving baud timing from an available AC signal
08/05/1980US4216542 Method and apparatus for quadriphase-shift-key and linear phase modulation
08/05/1980US4216463 Programmable digital tone detector
08/05/1980CA1083227A1 Method and apparatus for performing binary equalization in voice-band phase-modulation modems
07/1980
07/29/1980US4215427 Carrier tracking apparatus and method for a logging-while-drilling system
07/29/1980US4215425 Apparatus and method for filtering signals in a logging-while-drilling system
07/29/1980US4215239 Apparatus for the acquisition of a carrier frequency and symbol timing lock
07/23/1980EP0013343A1 Process and device to detect a pseudo-random sequence of 0 degree and 180 degree phase changes of the carrier in a data receiver
07/23/1980EP0013329A1 Method and circuit arrangement for the transmission of a binary signal by frequency-modulation
07/22/1980CA1082318A1 Wide acquisition range msk demodulator input circuit
07/22/1980CA1082313A1 Transmitter/receivers
07/15/1980US4213097 Hybrid automatic gain control circuit
07/15/1980US4213095 Feedforward nonlinear equalization of modulated data signals
07/15/1980US4213094 Poly-phase modulation systems
07/15/1980US4213006 Circuit arrangement for the coarse synchronization of carrier signals and pulse signals with data signals in a data receiver
07/09/1980EP0012917A1 Homodyne transmission system
07/09/1980EP0012884A1 Process and apparatus for detecting a pseudo-random sequence of two symbols in a data receiver using a double sideband modulation with quadrature carriers
07/08/1980US4212013 Duplex-transmitter receiver arrangement
07/08/1980US4211996 Error correction system for differential phase-shift-keying
07/08/1980CA1081364A1 Differential detection systems with non-redundant error correction
07/01/1980US4210879 Four-phase staggered shift keying modulator system
07/01/1980CA1080807A1 Distortion adapter receiver having intersymbol interference correction
06/1980
06/24/1980US4209750 Swept-carrier transmission system adapted for use in process control systems
06/17/1980CA1079877A1 Method of telecommunications
06/17/1980CA1079859A1 Digital modulator
06/17/1980CA1079857A1 Multi-line, multi-mode modulator using bandwidth reduction for digital fsk and dpsk modulation
06/12/1980WO1980001229A1 Phase correction circuit
06/03/1980US4206423 Digitized phase modulating means
06/03/1980US4206320 High speed modem suitable for operating with a switched network
05/1980
05/20/1980US4204164 Noise detector circuit
05/20/1980CA1078030A1 Digital phase detector
05/14/1980EP0011015A1 Regenerative digital radio repeater, and a transmission network including such repeaters
05/14/1980EP0011014A1 Device for measuring the quality of a digital connection and transmission equipments including such a device
05/14/1980EP0010731A1 Quaternary modulation method for digital data transmission and device for realizing this method
05/06/1980US4201942 Data conversion system
05/01/1980WO1980000903A1 A method of phase synchronization in a synchronous data transmission system,and apparatus for carrying out the method
04/1980
04/29/1980US4200838 Apparatus for evaluating the error rate of binary digital signals
04/29/1980CA1076650A1 Fsk demodulator
04/22/1980US4199821 Data transmission
04/22/1980US4199809 Programmable data terminal set
04/22/1980US4199761 Multichannel radio communication system for automated power line distribution networks
04/22/1980CA1076262A1 Method and apparatus for determining the initial values of the coefficients of a complex transversal equalizer
04/22/1980CA1076219A1 Demodulator for combined digital amplitude and phase keyed modulation signals
04/15/1980CA1075844A1 Halogen-containing fire retardant additive with improved heat stability
04/08/1980US4197501 System for reception of frequency modulated digital communication signals
04/08/1980CA1075364A1 Multiport programmable digital data set
04/08/1980CA1075361A1 Data transmission, particularly with delta modulation
04/08/1980CA1075317A1 Qam phase jitter and frequency offset correction system
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