| Patents for H04L 27 - Modulated-carrier systems (89,721) |
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| 04/10/1991 | EP0421601A2 Linearizer for QAM-receiver |
| 04/10/1991 | EP0421533A1 Predistortion apparatus for a digital transmission system |
| 04/10/1991 | EP0421532A1 Predistortion apparatus for a digital transmission system |
| 04/09/1991 | US5007069 Decoding of signals using cophase and differentiating signal detection |
| 04/09/1991 | US5007068 Doppler-corrected differential detection system |
| 04/09/1991 | US5006926 High definition multiple analog component amplitude modulated television transmission system |
| 04/07/1991 | CA2026820A1 Predistortion arrangement for a digital transmission system |
| 04/07/1991 | CA2026819A1 Predistortion arrangement for a digital transmission system |
| 04/04/1991 | WO1991004610A1 Signal digitizing method and system |
| 04/03/1991 | EP0420192A2 Unique word detection apparatus |
| 04/03/1991 | EP0419450A1 Method and system for modulating a carrier signal |
| 04/02/1991 | US5005189 Detection of digital signals received from multipath channels |
| 04/02/1991 | US5005187 Remote control |
| 04/02/1991 | US5005186 Digital demodulator apparatus |
| 04/02/1991 | US5005168 Multirate wire line modem apparatus |
| 04/02/1991 | CA1282494C D/a converter capable of producing an analog signal having levels of a preselected number different from 2 and communication network comprising the d/a converter |
| 03/27/1991 | EP0419432A1 A method of generating quality factors for binary digits obtained in the viterbi-analysis of a signal |
| 03/26/1991 | CA1282127C Digital demodulation system |
| 03/21/1991 | WO1991003871A1 Fully integrated digital fm discriminator |
| 03/20/1991 | WO1991004612A1 A method of generating quality factors for binary digits obtained in the viterbi-analysis of a signal |
| 03/20/1991 | EP0418165A1 A reconfigurable modem for a computer or the like |
| 03/20/1991 | EP0417528A2 Wide-band baseband 90 phase shifting circuit and FSK radio receiver having the same |
| 03/20/1991 | EP0417390A2 GMSK narrowband modem |
| 03/20/1991 | EP0417272A1 Receiver for quadraphase modulation signals. |
| 03/19/1991 | US5001727 Carrier and data recovery and demodulation system |
| 03/19/1991 | US5001724 Method and apparatus for measuring phase accuracy and amplitude profile of a continuous-phase-modulated signal |
| 03/12/1991 | WO1991003899A1 Carrier modulation without sidebands |
| 03/12/1991 | US4999590 Four state phase shift modulator, in particular for amplitude modulation of two carriers in quadrature with a large number of states |
| 03/12/1991 | CA2066735A1 Digital amplitude modulation with zero sidebands |
| 03/07/1991 | WO1991003114A1 Conversion of analog signal into i and q digital signals with enhanced image rejection |
| 03/06/1991 | EP0415406A2 Multilevel quadrature amplitude demodulator capable of compensating for a quadrature phase deviation of a carrier signal pair |
| 03/06/1991 | EP0415108A2 Method of and apparatus for correcting the phase of a playback clock signal |
| 03/05/1991 | CA1281095C Multipurpose digital integrated circuit for communication and control network |
| 03/01/1991 | CA2021749A1 Bi-phase code generation and amplification circuit for microwave and millimeter-wave frequencies |
| 02/27/1991 | EP0413875A1 Timing control for modem receivers |
| 02/27/1991 | EP0140925B1 Modulation detector and classifier |
| 02/27/1991 | CN1049581A Subscriber unit for wireless digital subscriber communication system |
| 02/26/1991 | WO1991003108A1 Gain/phase compensation for linear amplifier feedback loop |
| 02/26/1991 | US4996697 Deglitching means for digital communication systems |
| 02/26/1991 | US4996503 Phase modulator circuit for encoding two binary digits per cycle of sine wave carrier |
| 02/21/1991 | WO1991002421A1 Process and device for converting digitally modulated high-frequency reception signals |
| 02/21/1991 | WO1991002403A1 Spectrally efficient digital fm modulation system |
| 02/20/1991 | EP0413153A2 Quadrature phase demodulation using a training sequence and a local signal offset from the received carrier frequency |
| 02/20/1991 | EP0413108A2 Method of detecting a particular signal sequence which reduces the effects of multipath transmission |
| 02/20/1991 | EP0413073A1 Adaptive loop gain phase filter |
| 02/20/1991 | EP0151616B1 Control signalling arrangement for a digital transmission system |
| 02/19/1991 | US4995052 Demodulation method |
| 02/19/1991 | US4994807 Voltage-to-frequency converter |
| 02/19/1991 | US4994802 Subscriber unit for wireless digital telephone system |
| 02/13/1991 | EP0412946A2 A demodulator for biphase, suppressed-carrier PSK signals |
| 02/13/1991 | EP0412884A1 Radio system for data transmission to a low cost passive terminal |
| 02/13/1991 | EP0412616A2 Receiver for time-varying distorted data signals |
| 02/13/1991 | EP0412490A2 Method for correcting waveform data in digital signal modulation and base band signal generator using data provided by this method |
| 02/13/1991 | EP0412427A2 Sample-and-hold digital phase-locked loop for ASK signals |
| 02/13/1991 | EP0412426A2 Self-oscillating burst mode transmitter with integral number of periods |
| 02/13/1991 | EP0412424A2 High speed digital telemetry system for implantable device |
| 02/13/1991 | EP0412291A2 Quadrature FSK receiver with compensation for frequency offset |
| 02/13/1991 | EP0412234A2 Demodulated data recognition and decision device |
| 02/13/1991 | EP0412207A1 Automatic frequency control circuit |
| 02/12/1991 | US4993048 Self-clocking system |
| 02/12/1991 | US4993047 Volterra linearizer for digital transmission |
| 02/12/1991 | US4993046 Coded modulation communication system |
| 02/07/1991 | WO1991001593A1 Saw device tapped delay line and apparatus using same |
| 02/06/1991 | EP0411207A2 Digital receiver operating at sub-nyquist sampling rate |
| 02/06/1991 | EP0138988B1 Simultaneous transmission of speech and data over an analog channel |
| 02/05/1991 | US4991184 Data communication system having a speed setting variable with transmission quality factors |
| 02/05/1991 | US4990867 For converting two digital signals |
| 02/05/1991 | CA1279906C Carrier recovery circuit for offset qpsk demodulators |
| 02/05/1991 | CA1279899C Security system with saw transmitter |
| 02/01/1991 | CA2004248A1 Digital receiver operating at sub-nyquist sampling rate |
| 01/31/1991 | DE3924635A1 Duplex digital data and simultaneous alarm signal transmission - using half of channel bandwidth for data traffic and remainder for alarm transmission in fail-back mode |
| 01/30/1991 | EP0410532A1 Method of synchronization by correlation |
| 01/30/1991 | CN1011463B Digital dqpsk circuit |
| 01/30/1991 | CN1011462B Transmission method and receiver of digital signal packet on the great capacity of transmission path |
| 01/30/1991 | CN1011461B Ensemble modem structure for imperfect transmission media |
| 01/29/1991 | US4989243 Use in a public telephone |
| 01/29/1991 | US4989220 Method and apparatus for demodulating a class of M-ary phase shift keyed (PSK) signals |
| 01/29/1991 | US4989219 Midlevel carrier modulation and demodulation techniques |
| 01/29/1991 | US4988951 Quadrature phase demodulator capable of operating under a wide input dynamic range |
| 01/29/1991 | CA2021974A1 Synchronisation method by means of correlation |
| 01/23/1991 | EP0409641A2 Multipoint connected communication system having function of retraining modems provided therein and method of retraining the modems |
| 01/23/1991 | EP0409142A2 FSK data waveform shaping circuit |
| 01/23/1991 | EP0220314B1 Reversible energy spreading data transmission technique |
| 01/23/1991 | CN1048776A Ensemble modem structure for imperfect transmission media |
| 01/23/1991 | CN1048775A Ensemble modem structure for imperfect transmission media |
| 01/23/1991 | CN1048774A Ensemble modem structure for imperfect transmission media |
| 01/22/1991 | US4987375 Carrier lock detector for a QAM system |
| 01/22/1991 | US4987374 FSK demodulator |
| 01/16/1991 | EP0408238A2 A frequency synthesiser |
| 01/16/1991 | EP0408026A2 Mobile communications system insensitive to false frame sync |
| 01/16/1991 | EP0407958A1 Reception apparatus for directional radio links |
| 01/16/1991 | EP0407956A1 Method of differential encoding for a phase modulation system |
| 01/16/1991 | EP0407673A1 Process of synchronizing a receiving modem after a training on data |
| 01/16/1991 | CN1048639A Synthetic digital modulator |
| 01/15/1991 | US4985900 Non-intrusive channel-impairment analyzer |
| 01/15/1991 | US4985688 Modulation system capable of accurately compensating for nonlinearities of an amplifier connected thereto |
| 01/15/1991 | US4985684 Fully integrated digital FM discriminator |
| 01/09/1991 | EP0406507A1 Block coding scheme for fractional-bit transmission |
| 01/08/1991 | US4984297 Four level frequency shift keying optical communication apparatus |
| 01/08/1991 | CA1278857C Frequency demodulator for television receiver with time multiplexing |