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)
04/1978
04/11/1978US4084128 Demodulator for phase reversal modulation system
04/11/1978US4084121 Solid state repeater for three wire synchro with selectable phase and frequency adjustment
04/04/1978US4083009 High reliability diversity communications system
03/1978
03/14/1978US4079355 Method for the transmission of binary information by means of a frequency-modulated signal and a circuit for performing that method
03/14/1978US4079329 Signal demodulator including data normalization
03/14/1978US4079316 Sliding tone command receiver system
03/14/1978US4079202 Digital communication system
03/07/1978US4078255 Sequence generator having amplitudes and phases of spectral components randomly distributed
03/07/1978US4078159 Modified duobinary repeatered span line
03/07/1978US4078157 Method and apparatus for regenerating a modified duobinary signal
02/1978
02/28/1978US4077021 Method and arrangement for coding binary signals and modulating a carrier signal
02/28/1978US4076956 Decision network for receiver of PSK digital signals
02/14/1978US4074199 Vestigial-sideband transmission system for synchronous data signals
02/14/1978US4074119 Code word determination
02/07/1978US4072905 Wide acquisition range MSK demodulator input circuit
01/1978
01/31/1978US4071829 Coherent phase detector using a frequency discriminator
01/24/1978US4070638 Nonlinear surface acoustic wave PSK encoder/correlator
01/17/1978US4069472 Foreground subject-identifying apparatus
01/10/1978US4068198 Phase-locked loop frequency shift key modulator
01/03/1978US4066841 Data transmitting systems
12/1977
12/27/1977US4065722 Demodulation method and circuit for discretely modulated ac signals
12/20/1977US4064487 Receiver and decoder
12/13/1977US4063197 Plural transistor oscillator phase continuous frequency encoder circuit
12/13/1977US4063196 Plural oscillator phase continuous frequency encoder
12/06/1977US4061977 Phase tracking network
12/06/1977US4061886 Dual tone multiple frequency generator
11/1977
11/22/1977US4059805 Phase lock loop carrier generator for receiver of phase modulated carrier pulse signals
11/15/1977US4058805 Digital multitone generator for telephone dialing
11/15/1977US4058742 Radio frequency pulse transmitters
11/08/1977US4057762 Device for phase synchronizing a reproduced reference carrier signal with windows specified for preselected ones of amplitude and phase modulated signal points
11/08/1977US4057759 Communication receiving apparatus
11/01/1977US4056838 In-band signal-to-noise ratio monitor for an FSK relaying system
10/1977
10/25/1977US4055727 Partial response, quadrature amplitude modulation system
10/18/1977US4054842 Channel gain imbalance compensation for FSK demodulator
10/18/1977US4054841 Differential demodulators using surface elastic wave devices
10/18/1977US4054838 QAM phase jitter and frequency offset correction system
10/11/1977US4053837 Quadriphase shift keyed adaptive equalizer
10/11/1977US4053836 Device for transmission of information by pulse code frequency shift modulation
10/11/1977US4053713 Multi-channel multiplex data transmission system
10/04/1977US4052557 Phase-jump detector and corrector method and apparatus for phase-modulated communication systems that also provides a signal quality indication
09/1977
09/20/1977US4049909 Digital modulator
09/13/1977US4048572 Adaptive correction of phase errors in noncoherent demodulation of carrier asymmetrically modulated with digital signals
09/06/1977US4047153 Statistical data detection method and apparatus
09/06/1977US4047114 Digital detector
08/1977
08/30/1977US4045767 Method of ultrasonic data communication and apparatus for carrying out the method
08/23/1977US4044202 Plural frequency signalling systems
08/16/1977US4042884 Phase demodulator with offset frequency reference oscillator
08/09/1977US4041406 Method and apparatus for the determination of the transition of digital data signals modulated with two different signal frequencies
08/09/1977US4041391 Pseudo noise code and data transmission method and apparatus
08/02/1977US4039961 Demodulator for combined digital amplitude and phase keyed modulation signals
08/02/1977US4039959 Two-tone decoder having high noise immunity
08/02/1977US4039952 Digital frequency shift-keyed transmitter
08/02/1977US4039951 Method and apparatus for digitally controlling an amplitude modulated pulse envelope on an rf signal
08/02/1977US4039749 Spread spectrum demodulator
08/02/1977US4039748 Method and device for synchronizing the receiver clock in a data transmission system
07/1977
07/19/1977US4037171 High speed tone decoder utilizing a phase-locked loop
07/19/1977US4037049 Modulator and demodulator for data communications network
07/12/1977US4035767 Error correction code and apparatus for the correction of differentially encoded quadrature phase shift keyed data (DQPSK)
07/12/1977US4035735 Demodulator comprising a phase shift circuit for controlling outputs of an automatic equalizer
07/12/1977US4035725 Automatic passband equalizer for data transmission systems
07/12/1977US4035625 Method and apparatus for performing binary equalization in voice-band phase-modulation modems
07/12/1977US4035581 Code word detecting method
07/05/1977US4034305 Demodulator for signals hybrid modulated by more and less significant digit signals in succession in each clock interval
06/1977
06/28/1977US4032847 Distortion adapter receiver having intersymbol interference correction
06/21/1977US4031471 Automatic frequency control circuit
06/14/1977US4030016 Precision active rectifier circuit
06/14/1977US4029903 Receiver for PSK digital signals
06/07/1977USRE29257 Digital filter for a digital demodulation receiver
06/07/1977US4028641 Linear phase modulator including a pair of Armstrong modulators
06/07/1977US4028626 Digital data receiver with automatic timing recovery and control
06/07/1977US4028622 Selective intermodulation distortion measurement
06/07/1977US4028490 MSK digital data synchronization detector
05/1977
05/31/1977US4027266 Digital FSK demodulator
05/31/1977US4027265 Unbalanced quadriphase demodulator
05/31/1977US4027250 Apparatus and method for reducing effects of amplitude and phase jitter
05/24/1977US4025730 In-band signal receiver
05/24/1977US4025719 Phase-directed decision feedback equalizer
05/17/1977US4024474 Circuit arrangement for wireless transmission of a control signal to the control path or a controllable semiconductor valve, in particular a thyristor
05/17/1977US4024342 System for detecting digital data transmitted by modulating a carrier
05/10/1977US4022988 Fault locating apparatus for digital transmission system
05/03/1977US4021758 Direct modulation 4 phase PSK modulator
05/03/1977US4021757 Phase lock-loop modulator using an arithmetic synthesizer
05/03/1977US4021744 Demodulator for frequency-keyed communication system
05/03/1977US4021743 Phase logic demodulator
05/03/1977US4021653 Digital programmable tone detector
04/1977
04/26/1977US4020461 Method of and apparatus for transmitting and receiving coded digital signals
04/26/1977US4020449 Signal transmitting and receiving device
04/26/1977US4020283 MSK digital data synchronization detector
04/19/1977US4019184 Direction-finding method and system
04/19/1977US4019149 Correlative data demodulator
04/12/1977US4017798 Spread spectrum demodulator
03/1977
03/29/1977US4015222 Modulated passband signal generator
03/29/1977US4015220 Frequency shift keyed toned generator
03/29/1977US4015206 Protective relaying modem receiver
03/29/1977US4015204 Method of telecommunications
03/29/1977US4015082 Multi-channel signal decoder
03/22/1977US4013965 Circuit for preventing errors in decoding information from distorted pulses
03/22/1977US4013960 Quadraphase modulator
03/08/1977US4011511 Frequency-shift digital data link and digital frequency detection system
03/08/1977US4011407 Narrow-band eight-phase modem
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