| Patents for H04L 27 - Modulated-carrier systems (89,721) |
|---|
| 05/18/1989 | WO1989004572A1 Digital dqpsk decoder circuit element |
| 05/16/1989 | US4831663 Digital signal transmission/reception using differential polarization modulation/demondulation |
| 05/16/1989 | US4831637 Apparatus and technique for timing jitter cancellation in a data receiver |
| 05/10/1989 | EP0167531B1 Packetized ensemble modem |
| 05/10/1989 | EP0134810B1 Apparatus and method for suppressing side lobe response in a digitally sampled system |
| 05/09/1989 | US4829598 Optical receiver with an optical coupler and an electronic amplifier |
| 05/09/1989 | US4829594 Adaptive correction of DC error transients |
| 05/09/1989 | US4829566 Apparatus for detecting and discriminating phase jumps in a periodic signal and its application to a telephone tone signal with phase inversions |
| 05/09/1989 | US4829562 Receiver for detecting different fixed frequency signals on a telephone trunkline |
| 05/09/1989 | US4829543 Phase-coherent TDMA quadrature receiver for multipath fading channels |
| 05/09/1989 | US4829542 PSK modem system having improved demodulation reliability |
| 05/09/1989 | US4829260 Phase-shift keyed carrier recovery |
| 05/09/1989 | CA1253929A1 Qpsk modulator or demodulator using subharmonic pump carrier signals |
| 05/09/1989 | CA1253920A1 Process and device for the radio transmission of coded data superimposed on a traditional frequency- modulated broadcast |
| 05/05/1989 | WO1989004095A1 Demodulation method |
| 05/03/1989 | EP0314301A2 Apparatus and method for measuring the signal-to-noise ratio |
| 05/03/1989 | EP0314197A2 A four level frequency shift keying optical communication apparatus |
| 05/03/1989 | EP0314196A2 Validity decision circuit capable of correctly deciding validity of an error signal in a multilevel quadrature amplitude demodulator |
| 05/02/1989 | US4827488 Demodulator for PSK-modulated signals |
| 05/02/1989 | US4827431 Methods and systems for the simultaneous quantitative measurement of phase and amplitude jitter impairments and signal to noise ratio in a qam data communication channel |
| 04/27/1989 | DE3734316A1 Method for producing phase-shifted alternating currents at the same frequency and/or at a multiple of the frequency, especially for telecommunications exchangers |
| 04/26/1989 | EP0313491A1 Four-phase PSK modulator, in particular for the amplitude modulation of two quadrature carriers with a large number of levels |
| 04/25/1989 | US4825452 Digital FSK demodulator |
| 04/25/1989 | US4825448 Subscriber unit for wireless digital telephone system |
| 04/25/1989 | CA1253229A1 Adaptive communication rate modem |
| 04/19/1989 | EP0312200A2 Synchroniser for a decoder and decoder system |
| 04/19/1989 | EP0312047A2 Analog-to-Digital Converter for Stepped Square QAM Demodulators |
| 04/19/1989 | CN1032474A Circuit for recovering carrier in digital transmission systems |
| 04/18/1989 | US4823361 Interference immune digital modulation receiver |
| 04/18/1989 | US4823346 Maximum likelihood decoder |
| 04/18/1989 | US4823339 Method and device for protecting modems against echoes |
| 04/18/1989 | CA1252823A1 Reversible energy spreading data transmission technique |
| 04/11/1989 | US4821291 Improvements in or relating to signal communication systems |
| 04/11/1989 | US4821261 Packet transmission of digital signals over a high capacity channel, particularly over a satellite broadcasting channel |
| 04/11/1989 | CA1252525A1 Demodulator capable of avoiding abnormal demodulation |
| 04/05/1989 | EP0310457A2 Digital premodulation filter |
| 04/05/1989 | EP0309627A1 Apparatus for connecting data processing equipment to a telephone network |
| 04/04/1989 | CA1252237A1 Expanded partial response processing for analog signal enciphering and the like |
| 03/29/1989 | EP0309306A1 Method for detecting false locks of a reference signal on a signal to be demodulated in coherent digital demodulation , and device for carrying out the method |
| 03/29/1989 | EP0309250A2 Correlation detecting circuit operable in a low frequency |
| 03/29/1989 | EP0309038A1 Carrier regeneration circuit for digital transmission systems |
| 03/29/1989 | EP0308891A2 Stepped square-QAM demodulator utilizing all signal points to generate control signals |
| 03/28/1989 | US4817116 Digital radio communication system utilizing quadrature modulated carrier waves |
| 03/28/1989 | US4817089 Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels |
| 03/28/1989 | US4816783 Method and apparatus for quadrature modulation |
| 03/23/1989 | DE3730399A1 Method and device for transmitting a digital signal |
| 03/21/1989 | US4815137 Voiceband signal classification |
| 03/21/1989 | US4815136 Voiceband signal classification |
| 03/21/1989 | US4814719 Unsymmetrical QPSK demodulator |
| 03/21/1989 | US4814717 FSK frequency discriminator for a coherent optical transmission system |
| 03/21/1989 | CA1251586A1 Ensemble modem structure for imperfect transmission media |
| 03/21/1989 | CA1251566A1 Digital signal generating device |
| 03/21/1989 | CA1251526A1 Multiple quadrature-phase amplitude modulating system capable of reducing a peak amplitude |
| 03/15/1989 | EP0306941A2 Variable bit rate clock recovery circuit |
| 03/15/1989 | EP0306760A1 Coherent digital signal blanking, biphase modulation and frequency doubling circuit and methodology |
| 03/15/1989 | EP0306713A2 Method and device for data processing |
| 03/15/1989 | EP0161264B1 Carrier-phase adjustment using absolute phase detector |
| 03/14/1989 | US4813058 FSK signal demodulator |
| 03/14/1989 | US4812786 Method and system for providing precise multi-function modulation |
| 03/09/1989 | WO1989002200A1 Adaptive jitter-tracking method and system |
| 03/09/1989 | WO1989002188A1 Phase demodulator and its application to an mls-type landing system |
| 03/09/1989 | DE3828623A1 Method for generating frequency and/or phase changes in alternating currents, for example for use in quadrature amplitude modulation (QAM) and for taking samples |
| 03/08/1989 | EP0305775A2 FSK demodulation circuit |
| 03/08/1989 | EP0305546A1 Digital demodulator apparatus. |
| 03/07/1989 | US4811363 Method for recovering a phase difference signal |
| 03/07/1989 | US4810921 Elastic surface wave device |
| 03/07/1989 | CA1250898A1 Radio frequency modem and method |
| 03/01/1989 | EP0305164A2 Vector modulation signal generator |
| 03/01/1989 | EP0305125A1 FSK discriminator |
| 03/01/1989 | CN1003484B Equipment for producing angular modolation carrier signals of consant amplitude in response to data signals |
| 02/28/1989 | US4809300 Branch metric algorithm for eight-dimensional signal constellation |
| 02/28/1989 | US4809299 Frequency independent information transmission system |
| 02/28/1989 | US4809296 Method for transmitting data via the lines of a power supply system |
| 02/28/1989 | US4808937 Phase-locked loop for a modem |
| 02/28/1989 | CA1250673A1 Subscriber rf telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of rf channels |
| 02/23/1989 | WO1989001726A1 Fsk discriminator |
| 02/22/1989 | CN1031306A Home unit for wireless digital telephone system |
| 02/22/1989 | CN1003399B 解调器 Demodulator |
| 02/21/1989 | US4807254 Carrier wave recovery system |
| 02/21/1989 | US4807253 Time-varying trellis-coded modulation formats which are robust in channels with phase variations |
| 02/21/1989 | US4807252 Digital communication system |
| 02/21/1989 | US4807251 PSK modem system with improved demodulation reliability |
| 02/14/1989 | US4805189 Signal processing system |
| 02/14/1989 | US4805174 Error correcting coder/decoder |
| 02/14/1989 | US4804931 Digital amplitude modulator - transmitter |
| 02/14/1989 | CA1250024A1 Supervisory audio tone detection in a radio channel |
| 02/09/1989 | WO1989001208A1 Data carrying devices |
| 02/08/1989 | EP0302622A2 Method of communicating stuffing indications in a multi-level communications system |
| 02/08/1989 | EP0302511A2 Sequential decoder having a short resynchronization interval |
| 02/07/1989 | US4803438 8-phase phase-shift keying demodulator |
| 02/02/1989 | DE3724537A1 Method for obtaining a phase error signal, and an arrangement for this purpose |
| 02/02/1989 | DE3724536A1 Conditioning of control signals in order to resolve the phase ambiguity in the case of n-PSK signals |
| 02/01/1989 | EP0301282A1 Signal transmission method |
| 02/01/1989 | EP0301240A2 Direct sequence digital spread spectrum modem |
| 01/31/1989 | US4801899 Quadrature amplitude modulation/demodulation device using multi-level digital signals |
| 01/25/1989 | EP0300565A1 Signal decoding device relating to frequency modulated transmissions |
| 01/25/1989 | EP0300476A2 Processing of control signals for suppressing the phase ambiguity in n-PSK signals |
| 01/25/1989 | EP0300265A2 Digital tone detection method |
| 01/24/1989 | US4800576 Convolution data recovery circuit |
| 01/24/1989 | US4800575 Modem FSK demodulation method and apparatus |