| Patents for H04L 27 - Modulated-carrier systems (89,721) |
|---|
| 08/18/1987 | CA1225727A1 Multifrequency tone distribution using a conferencing arrangement |
| 08/12/1987 | EP0231929A2 Phase shift keying signal demodulation method and apparatus |
| 08/11/1987 | US4686709 Optical Transmission circuit |
| 08/11/1987 | US4686689 For receiving an input signal |
| 08/11/1987 | US4686688 Arrangement for generating an angle-modulated carrier signal of a constant amplitude in response to data signals |
| 08/11/1987 | US4686490 Digital data modulator and digital-to-analog converter |
| 08/11/1987 | US4686484 Phase detection circuit |
| 08/05/1987 | EP0230900A1 Device for clock recovery |
| 08/05/1987 | EP0230559A1 Method for clock-synchronization of a signal receiver |
| 07/30/1987 | EP0152423A4 Maintenance response signalling arrangement for a digital transmission system. |
| 07/29/1987 | EP0229923A2 Multilevel QAM transmission system introducing supplementary signal points |
| 07/28/1987 | US4683578 Automatic gain control using the extreme points of a constellation |
| 07/28/1987 | CA1224878A1 Apparatus and method for suppressing side lobe response in a digitally sampled system |
| 07/28/1987 | CA1224846A1 Microprocessor fsk data communications module |
| 07/23/1987 | EP0151616A4 Control signalling arrangement for a digital transmission system. |
| 07/22/1987 | EP0229443A1 Method and apparatus for identifying the components of a signal |
| 07/21/1987 | US4682344 Rf fsk transmitter |
| 07/21/1987 | US4682343 Processing circuit with asymmetry corrector and convolutional encoder for digital data |
| 07/21/1987 | US4682123 Digital voice and data frequency modulation circuit |
| 07/21/1987 | US4682118 Phase shift keying and phase modulation transmission system |
| 07/21/1987 | US4682117 Quadrature demodulation data receiver with phase error correction |
| 07/21/1987 | CA1224542A1 Demodulator for multilevel amplitude modulation system |
| 07/21/1987 | CA1224541A1 Circuit for establishing accurate sample timing |
| 07/21/1987 | CA1224540A1 Frequency offset correcting circuit |
| 07/21/1987 | CA1224531A1 Method of measuring quality of a signal received by a receiver of a two-dimensional linear modulation data communication system |
| 07/16/1987 | WO1987004311A1 Method of data communication by radio and arrangement therefor |
| 07/14/1987 | US4680778 Fast acquisition circuit for synchronous digital receiver operating in wideband noise |
| 07/14/1987 | US4680777 Quadrature-quadrature phase shift keying |
| 07/14/1987 | US4680775 Device for coding-decoding a binary digital signal bit stream for an "OQPSK" digital modulator-demodulator with four phase states |
| 07/14/1987 | US4680772 Digital signal repeater including means for controlling a transmitter |
| 07/14/1987 | US4680749 Duplex radio transceiver having improved data/tone and audio modulation architecture |
| 07/14/1987 | US4680556 Digital modulation apparatus |
| 07/08/1987 | EP0227773A1 Digital information transmission system and method |
| 07/08/1987 | EP0227729A1 Coherent optical receivers |
| 07/07/1987 | US4679243 Communication system |
| 07/07/1987 | US4679227 Ensemble modem structure for imperfect transmission media |
| 07/07/1987 | US4679208 Equalization system tuning device which updates equalizer coefficients based on selected decision regions |
| 07/01/1987 | EP0227473A2 Error correcting coder/decoder |
| 07/01/1987 | EP0226877A2 Method for transmitting bit signals, bit signal transmitter and receiver for carrying out this method, as well as a record carrier for this method |
| 06/30/1987 | US4677626 Self-synchronizing interleaver for trellis encoder used in wireline modems |
| 06/30/1987 | US4677624 Self-synchronizing de-interleaver for viterbi decoder used in wireline modems |
| 06/30/1987 | US4677619 Method and apparatus for supervising digital radio transmission line |
| 06/30/1987 | US4677398 Pulsed digital multiplex laser generator |
| 06/24/1987 | EP0226514A1 Carrier phase or frequency shift keying modulation device |
| 06/23/1987 | US4675883 Arrangement for Carrier Recovery from Two Received Phase Shift Keyed Signals |
| 06/23/1987 | US4675882 FM demodulator |
| 06/23/1987 | US4675881 Arrangement for recovering a clock signal from an angle-modulated carrier signal having a modulation index m=0.5 |
| 06/23/1987 | US4675863 Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels |
| 06/23/1987 | US4675619 Multiple quadrature-phase amplitude modulating system capable of reducing a peak amplitude |
| 06/23/1987 | CA1223367A1 Differential coding system and apparatus therefor |
| 06/23/1987 | CA1223308A1 Automatic gain control circuit |
| 06/16/1987 | US4674105 Digital signal processor |
| 06/16/1987 | US4674103 Method and arrangement for detecting the presence of a training signal in a modem receiver |
| 06/10/1987 | EP0225269A1 Phase shift-keyed modulator 22n-QAM and, in particular, a 4-PSK modulator |
| 06/10/1987 | EP0225218A1 Frequency synthesis method and synthesis apparatus using this method |
| 06/09/1987 | US4672641 Surface acoustic wave device for data rate reduction |
| 06/09/1987 | US4672640 Radio receiver |
| 06/09/1987 | US4672636 AFC circuit for direct modulation FM data receivers |
| 06/09/1987 | US4672634 Arrangement for generating an angle-modulated carrier signal of constant amplitude in response to data signals |
| 06/09/1987 | US4672632 Optimized communications system and method employing channel synthesis and phase lock detection |
| 06/09/1987 | US4672631 Radio receiver with variable phase shift correction |
| 06/03/1987 | CN85107546A Multiple quadrature-phase amplitude modulating system capable of reducing peak amplitude |
| 06/02/1987 | US4670889 Frequency control for point to multipoint radio |
| 06/02/1987 | US4670888 Frequency modulated modem transmitter |
| 06/02/1987 | US4670887 Multiplexed PSK demodulator |
| 06/02/1987 | US4670875 Multiplexed dual tone multi-frequency encoding/decoding system for remote control applications |
| 05/26/1987 | US4669095 Maximum distance from zero crossing MSK demodulator |
| 05/26/1987 | US4669094 FSK data receiver |
| 05/26/1987 | CA1222289A1 Digital data receiver including timing adjustment circuit |
| 05/20/1987 | CN86105925A Transmission method and receiver of digital signal packet on the great capacity of transmission path, especially satellite transmission path |
| 05/20/1987 | CN86105333A 数字射频接收机 Digital RF Receiver |
| 05/19/1987 | US4667334 System for broadcasting data packets originating from different sources |
| 05/12/1987 | US4665534 Method of and apparatus for determining time origin of timer for modem |
| 05/12/1987 | US4665532 Radio communication system |
| 05/12/1987 | CA1221740A1 Premodulation filter for generating in combination with a fm transmitter a generalized tamed frequency signal |
| 05/06/1987 | EP0220705A2 Quadriphase phase modulation system |
| 05/05/1987 | US4663768 Diversity system of selection type equipped with a code correction/switch circuit for receiving a PSK or QAM wave carrying differentially encoded signal |
| 05/05/1987 | US4663675 Apparatus and method for digital speech filing and retrieval |
| 04/29/1987 | EP0219863A2 Lock circuit for carrier recovery from a QAM signal |
| 04/28/1987 | US4661948 Digital quadrature amplitude modulator |
| 04/28/1987 | US4661945 Differential coding system and apparatus therefor |
| 04/21/1987 | US4660215 Transmitter/receiver system |
| 04/21/1987 | US4660214 QANI Trellis-coded signal structure |
| 04/21/1987 | US4660213 Signal structure for data communication |
| 04/21/1987 | US4659999 Direct frequency synthesizer which is step-wise variable and has phase continuity and phase reproducibility when switching frequencies |
| 04/14/1987 | US4658420 Tone responsible disabler circuit for an echo canceller |
| 04/14/1987 | US4658405 Radio communication system |
| 04/14/1987 | US4658364 Signal processing apparatus |
| 04/14/1987 | CA1220531A1 8-phase phase-shift keying demodulator |
| 04/14/1987 | CA1220526A1 Recovery of carrier and clock frequencies in a phase or amplitude state modulation and coherent demodulation digital transmission system |
| 04/09/1987 | DE3536032A1 Demodulation method for binary frequency-modulated signals |
| 04/09/1987 | DE3535988A1 Method and device for demodulating a binary frequency-modulated signal |
| 04/09/1987 | DE3531635A1 Method for two-track digital signal transmission in an unbalanced band-limited channel by means of quadrature amplitude modulation |
| 04/08/1987 | EP0217570A2 Error-correcting modem |
| 04/08/1987 | EP0217328A2 Transversal equalizer |
| 04/07/1987 | US4656648 Process for the noncoherent demodulation of a digital signal |
| 04/07/1987 | US4656647 Pulsed bi-phase digital modulator system |
| 04/07/1987 | US4656646 Serial minimum shift-keyed modem |
| 04/07/1987 | US4656644 Digital radio receiving apparatus |
| 04/07/1987 | US4656630 Automatic gain control circuit |