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)
09/1986
09/16/1986CA1211515A1 Combined adaptive equalization and demodulation circuit
09/16/1986CA1211514A1 Automatic adaptive equalizer having improved reset function
09/10/1986EP0194085A2 Tone detector with pseudo phase locked loop
09/02/1986US4609886 PLL modulation circuit
09/02/1986CA1210877A1 Method of synchronizing parallel channels of orthogonally multiplexed parallel data transmission system and improved automatic equalizer for use in such a transmission system
08/1986
08/26/1986US4608703 Synchronization detection system for data transmission
08/26/1986US4608699 Simulcast transmission system
08/26/1986US4608540 Phase-shift keying demodulator
08/26/1986CA1210540A1 Transmission circuit for a dtmf-telephone set
08/26/1986CA1210514A1 Binary signal decoding apparatus and method
08/26/1986CA1210460A1 Coherent phase shift keyed demodulator with improved sampling apparatus and method
08/20/1986EP0191459A2 Waveform shaping circuit
08/20/1986EP0108117B1 Dual tone multifrequency and dial pulse receiver
08/19/1986CA1210096A1 Equalizer modifying a phase of a gain control signal to carry out equalization
08/19/1986CA1210072A1 Direct modulation fm data receiver
08/14/1986WO1986004762A1 Supervisory audio tone detection in a radio channel
08/13/1986EP0190583A2 Receiver for phase shift modulated carrier signals
08/13/1986EP0190166A1 Rf amplifier with frequency spectrum control.
08/13/1986CN86100810A 波形成型电路 Waveform shaping circuit
08/12/1986US4606051 QPSK demodulator with I and Q post-detection data correction
08/12/1986US4606049 Remote transmitter control system
08/12/1986US4606048 Radio communication system
08/12/1986US4606047 High frequency communications
08/12/1986US4606045 Method and apparatus for detecting an equalizer training period in a receiving-end modem
08/12/1986US4606044 Adjusting data transmission rate based on received signal quality
08/12/1986US4606039 Spread spectrum coding method and apparatus
08/12/1986US4605903 FSK demodulator with high noise immunity digital phase detector
08/12/1986CA1209666A1 Tone receiver for digital data communication systems
08/05/1986US4604713 Tone detector and multifrequency receiver using said detector
08/05/1986US4604583 For use in demodulator
07/1986
07/30/1986CN85100121A Carrier tracking loop using the parity arithmetic
07/29/1986US4603393 Demodulator for constant envelope and continuous phase signals which are angle modulated by a train of binary symbols
07/29/1986CA1208788A1 Frequency-encoding circuit for reducing distortion
07/29/1986CA1208712A1 Circuit for recovering the carrier of an amplitude- and-phase-modulated input signal
07/29/1986CA1208708A1 Dc voltage control circuits
07/22/1986US4602374 Multi-level decision circuit
07/22/1986US4602226 Apparatus for the gated modulation of a radio-frequency carrier signal
07/22/1986CA1208311A1 Timing synchronizing circuit for demodulators
07/15/1986US4601048 Serial minimum shift-keyed modem
07/15/1986US4601046 System for transmitting data through a troposcatter medium
07/15/1986US4601044 Carrier-phase adjustment using absolute phase detector
07/15/1986US4600892 RF amplifier with frequency spectrum control
07/15/1986CA1207841A1 Error-correction system for two-dimensional multilevel signals
07/09/1986EP0186757A2 QAM modulator and demodulator
07/09/1986EP0186691A1 Technique for acquiring timing and frequency synchronization for modem utilizing known (non-data) symbols as part of their normal transmitted data format
07/08/1986US4599732 Technique for acquiring timing and frequency synchronization for modem utilizing known (non-data) symbols as part of their normal transmitted data format
07/08/1986US4599583 Mixed dual frequency generating system
07/02/1986EP0186568A2 Digital demodulator for continuously phase or frequency modulated signals
07/02/1986CN85104473A Storing responce type digital frequency modulation method
07/02/1986CA1207039A Constant envelope offset qpsk modulator
06/1986
06/25/1986EP0185610A2 Device for contactless signal and energy transmission
06/25/1986EP0185496A2 Error-correction coding for multilevel transmission system
06/25/1986EP0185203A2 Digital minimum shift keyed modulator
06/25/1986EP0185120A1 Underwater communication
06/24/1986US4597107 Modulation detector and classifier
06/24/1986US4597090 Block coded modulation system
06/24/1986US4597089 Single pulse fast learn modem
06/24/1986CA1206553A2 Telemetry system with signal booster for digital data transmission through a transmission line
06/24/1986CA1206529A1 Carrier wave regenerating circuit
06/19/1986WO1986003643A1 Method and circuit for detecting the information contained in a received signal
06/18/1986EP0184953A1 Method and device for digital information transmission using differential frequency shift keying
06/18/1986EP0184805A2 Demodulator
06/17/1986US4596022 FSK data communication system
06/17/1986US4596011 Data transmission system for a local network
06/17/1986CA1206215A1 Demodulation device for composite psk-psk modulated waves
06/11/1986EP0183765A1 Data communication method and appartus
06/10/1986US4594727 Synchronous receiver
06/10/1986US4594725 Combined adaptive equalization and demodulation circuit
06/10/1986CN85109557A 解调器 Demodulator
06/10/1986CN85100039A Digital communication multiplex transmission system for level multiplex
06/05/1986WO1986003356A1 Data modem system
06/04/1986EP0182850A1 Circuit for demodulating phase shift keyed signals
06/03/1986CA1205541A2 Power supply circuit
05/1986
05/27/1986US4592075 Phase-shift keying demodulator
05/27/1986US4592073 Burst signal transmission system
05/27/1986US4592071 Recovery of carrier and clock frequencies in a phase or amplitude state modulation and coherent demodulation digital transmission system
05/27/1986US4592009 MSK surface acoustic wave convolver
05/27/1986US4591797 PSK demodulator having an AFC circuit
05/14/1986EP0180969A2 Automatic level control circuit for an AD converter
05/10/1986CN85108891A D/a converter capable of producing an analog signal having levels of a preselected number different from 2 to the power n and communication network comprising the d/a converter
05/07/1986EP0180339A2 A multi-mode radio transceiver
05/06/1986US4587498 Circuit for recovering the carrier of an amplitude-and-phase-modulated input signal
05/06/1986CA1204177A1 Symmetrical polyphase networks
05/06/1986CA1204164A1 Data transmission system for a local network
04/1986
04/30/1986EP0179393A1 Intermediate frequency transversal equalizer
04/29/1986US4586186 Maintenance response signalling arrangement for a digital transmission system
04/29/1986US4586182 Source coded modulation system
04/29/1986US4585998 Method and device for coherent demodulation of a digitally modulated carrier
04/29/1986US4585909 Transmission circuit for a DTMF-telephone set
04/22/1986US4584692 Data transmitting-receiving system
04/22/1986US4584652 Apparatus and method for determining in-phase and quadrature-phase components
04/22/1986US4584540 Digital direct modulator with type of modulation selection
04/22/1986US4584533 Non-coherent BPSK demodulator
04/22/1986CA1203632A1 Method and apparatus for transferring digital data
04/22/1986CA1203595A1 Transmitter equalization for modems in a polled arrangement
04/22/1986CA1203582A1 Adaptive differential psk demodulator
04/22/1986CA1203577A1 Transmission circuit for modems employing frequency shift keying
04/16/1986EP0177883A1 Carrier recovery arrangement for received 2-PSK signals
04/15/1986US4583239 Digital demodulator arrangement for quadrature signals
04/15/1986US4583238 Synchronous data transmission system using a carrier modulated by an envelope of constant amplitude
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