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)
09/1982
09/21/1982CA1132270A1 Digital multi-level multi-phase modulation communication system
09/14/1982US4349785 Phase-controlling feedback circuit for single sideband demodulation
09/08/1982EP0059415A1 System for demodulation of phase-shift keying signals
09/07/1982US4348769 Circuitry for extraction of a transmission clock signal from-modulated data transmissions
09/07/1982US4348641 Digital baseband carrier recovery circuit
09/07/1982CA1131317A1 Method and device for detecting and interpreting a distress signal
09/02/1982WO1982002985A1 Biphase detector
09/01/1982EP0058754A2 Arrangement for injecting digital signals into a line system
08/1982
08/31/1982US4347616 Digital multi-level multi-phase modulation communication system
08/31/1982US4347408 Multi-frequency signal receiver
08/31/1982CA1130927A1 Memory system adapted to receive a radio frequency signal
08/31/1982CA1130923A1 Vital electronic code generator
08/31/1982CA1130866A1 Digital signal reception system
08/24/1982US4346473 Error correction coding method and apparatus for multilevel signaling
08/24/1982US4346472 Method and apparatus for eliminating double bit errosion in a differential phase shift keying system
08/24/1982US4346448 Generation of electric signals having approximately sinusoidal waveforms
08/24/1982US4346367 Circuit for converting binary digital signals into pseudoternary A.C. pulses
08/18/1982EP0058113A2 Switched capacitor filter and modem using such a filter
08/17/1982CA1129974A1 Phase modulated data transmission system
08/10/1982US4344178 Costas loop QPSK demodulator
08/10/1982US4344177 Equalizer comprised of equalizer sections which include internal accumulation circuits
08/10/1982US4344041 Biphase detector
08/10/1982US4343759 For data receiver
08/10/1982CA1129506A1 Circuit for recovering the carrier of a synchronous digital signal transmitted by amplitude modulation
08/05/1982WO1982002633A1 High frequency communications
08/03/1982CA1129103A1 One-bit frequency-shift-keyed modulator
07/1982
07/27/1982CA1128614A1 Multi-frequency signal receiving apparatus
07/27/1982CA1128613A1 Carrier recovery apparatus
07/20/1982CA1128187A1 Method and apparatus for demodulating signals in logging while drilling system
07/14/1982EP0055922A1 Adaptive equalizer for quadrature amplitude modulation
07/13/1982US4339824 Clock recovery circuit for TDMA system or message switching system
07/13/1982US4339817 Clock recovery circuit for burst communications systems
07/13/1982US4339725 Synchronous demodulator for multi-phase PSK signal
07/13/1982EP0046804A4 Message communication system.
07/08/1982WO1982002304A1 Tone detector circuit
07/07/1982EP0055373A1 Method for demodulating single sideband signals
07/06/1982US4338579 Frequency shift offset quadrature modulation and demodulation
07/06/1982US4338574 Carrier recovering circuit for phase modulated signal
06/1982
06/30/1982EP0054583A1 Method of transmitting binary data sequences and arrangement for enabling the rapid determination of the end of a transmitted binary data sequence
06/30/1982EP0054582A1 Communication system in which data are transferred between terminal stations and satellite stations by infrared signals
06/29/1982CA1126865A1 Programmable digital tone detector
06/29/1982CA1126849A1 Method and apparatus for demodulating signals in a logging while drilling system
06/29/1982CA1126848A1 Method and apparatus for demodulating signals in a logging while drilling system
06/29/1982CA1126826A1 Coefficient tap leakage for fractionally-spaced equalizers
06/24/1982WO1982002131A1 Method and apparatus for demodulating differentially encoded phase modulated data transmissions
06/22/1982US4336613 Charge coupled device filters and modems incorporating such filters
06/22/1982US4336500 MSK Demodulator frequency acquistion apparatus and method
06/16/1982EP0053939A1 Digital phase locked loop pull-in circuitry
06/16/1982EP0053629A1 Voiceband data set.
06/15/1982US4335446 Terminal equipment for data-transmission network including digitally operating modem
06/15/1982US4335354 Sensitive demodulator for frequency shift keyed carrier signals
06/15/1982CA1125870A1 Tone signal detectors
06/08/1982US4334312 Phase synchronizing circuit for use in multi-level, multi-phase, superposition-modulated signal transmission system
06/08/1982US4334249 Apparatus for use in recording a pulse signal on a magnetic recording medium
06/08/1982CA1125404A1 Method for generating a pseudo-signal in an error rate supervisory unit and circuit for carrying out the same
06/08/1982CA1125403A1 Clock memory for digital data communications system
06/02/1982EP0053051A1 Method of transmitting operational signals of a digital microwave link; transmitter and receiver for carrying out such a method
06/01/1982US4333150 Signal receiving apparatus and method
05/1982
05/26/1982EP0052463A1 Soft decision convolutional code transmission system
05/18/1982US4330863 Demodulator arrangement
05/18/1982US4330687 Audio and full duplex digital data carrier system
05/12/1982EP0051473A1 Phase-locked loop with initialization loop
05/11/1982US4329678 Method and apparatus for remotely controlling an electrical appliance
05/04/1982US4328587 Phase slip detector and systems employing the detector
05/04/1982US4328576 Wide band demodulator of phase modulated signals
05/04/1982CA1123101A1 Data transmission system
05/04/1982CA1123058A1 Receiver for data-transmission system operating with single-sideband amplitude modulation
04/1982
04/27/1982US4327440 Signal detector for use in digital communication
04/27/1982US4327439 Method for generating modem transmission signals with quadrature amplitude modulation
04/21/1982EP0050082A1 Full duplex communication system for voice grade channels
04/20/1982US4326256 Frequency discriminating circuit
04/20/1982CA1122294A1 Power line signalling system
04/13/1982CA1121871A1 Derangement detector in a receiver of a system for data transmission by means of phase modulation of a carrier
04/07/1982EP0049189A1 Methods for generating the modulations "duobinary FSK","tamed FSK" and "TFM", and modulators for carrying out these methods
04/07/1982EP0049059A2 Pulse code demodulator for frequency shift keyed data
04/06/1982US4324001 Synchronizer for MSK burst communications
04/06/1982US4323862 Frequency shift modulator with circuitry for simple change-over between high and low channels
03/1982
03/31/1982EP0048475A1 Transversal equalizer
03/30/1982US4322851 Decoding logic for frequency shift keying receiver
03/29/1982EP0040217A4 Apparatus for and method of processing data signals.
03/23/1982CA1120559A1 Digital demodulator for phase shift keyed signals
03/16/1982US4320526 Adaptive phase-jitter tracker
03/16/1982US4320523 Digital signal reception system
03/16/1982US4320522 Programmable frequency and signalling format tone frequency encoder/decoder circuit
03/16/1982US4320517 Method and device for effecting the initial adjustment of the clock in a synchronous data receiver
03/16/1982US4320499 System for multi-level data transmission by means of an angle-modulated carrier having a constant amplitude
03/16/1982US4320361 Amplitude and frequency modulators using a switchable component controlled by data signals
03/16/1982US4320345 Adaptive differential PSK demodulator
03/16/1982CA1120121A1 Method and apparatus for generating timing phase error signals in psk demodulators
03/10/1982EP0046804A1 Message communication system
03/10/1982EP0046791A1 Tranciever for phase-shift modulated signals
03/09/1982CA1119677A1 Rhytm recovery device
03/03/1982EP0046682A1 Single channel duplex communication system
03/02/1982US4318049 Carrier recovery circuit for use in a multi-level phase shift keying demodulator
02/1982
02/23/1982US4317219 Mobile radio system
02/23/1982US4317210 Coherent receiver for angle-modulated data signals
02/23/1982US4317209 FSK Tone generator circuit
02/23/1982US4317207 Data transmission system
02/23/1982US4317206 On line quality monitoring
02/17/1982EP0045923A1 Digital receiver for four-phase differential modulated signals
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