| Patents for H04L 27 - Modulated-carrier systems (89,721) |
|---|
| 04/10/1990 | CA1267703A1 System for controlling operation mode of modulator/demodulator |
| 04/05/1990 | WO1990003699A1 Log-polar signal processing |
| 04/04/1990 | EP0361608A1 Adaptive pre-distortion circuit |
| 04/04/1990 | EP0361151A2 Device for generating an FSK-modulated optical signal with two different polarisation states for an optical transmission system with an optical heterodyne FSK receiver having two filters |
| 04/04/1990 | EP0361150A2 Method for the synchronised keying of the polarisation state of an optical signal in an optical transmission system with heterodyne reception, and device for carrying out the method |
| 04/03/1990 | US4914613 Frequency synthesis method and a synthesizer apparatus using this method |
| 03/28/1990 | EP0360770A1 Log-polar signal processing |
| 03/28/1990 | EP0360178A2 Transmitter circuit for efficiently transmitting communication traffic via phase modulated carrier signals |
| 03/28/1990 | EP0359858A1 Digital demodulator apparatus |
| 03/28/1990 | CN1040883A Modem with improved digital signal processor |
| 03/27/1990 | US4912728 Analog-to-digital converter for stepped square QAM demodulators |
| 03/27/1990 | US4912723 Multipurpose digital IC for communication and control network |
| 03/27/1990 | US4912705 Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels |
| 03/27/1990 | US4912422 Demodulation system for PSK signals with low carrier to noise ratio and large frequency offset |
| 03/27/1990 | CA1267195A1 Technique for synthesizing the modulation of a time varying waveform with a data signal |
| 03/22/1990 | DE3831055A1 Method for the digital coding of information of one, two or more channels and/or reducing the frequency of the alternating coding current or currents and transmission thereof |
| 03/22/1990 | DE3831054A1 Method for the digital coding of information of one, two or more channels and/or reducing the frequency of the alternating coding current or currents and transmission thereof |
| 03/21/1990 | EP0359609A1 Variable rate digital filter for a phase modulator |
| 03/21/1990 | EP0359261A2 Subsignal transmitting system |
| 03/21/1990 | EP0359183A2 System and method of transmitting a complex waveform over a communication channel utilizing lincompex techniques |
| 03/20/1990 | US4910753 FSK demodulating device |
| 03/20/1990 | US4910474 Method and apparatus for generating phase and amplitude modulated signals |
| 03/20/1990 | US4910469 Demodulator for sampled data FM signals |
| 03/20/1990 | US4910467 Method and apparatus for decoding a quadrature modulated signal |
| 03/14/1990 | EP0358582A2 A unique word detection system |
| 03/14/1990 | EP0358466A2 A direct sequence modulation apparatus |
| 03/14/1990 | EP0357799A1 Method and apparatus for modulating a semiconductor laser |
| 03/14/1990 | CN1007196B Tone detector with pseudo locked loop |
| 03/13/1990 | US4908840 PSK modulation with an error correction memory |
| 03/13/1990 | US4908838 Correlation detecting circuit operable in a low frequency |
| 03/13/1990 | CA1266706A1 Radio receiver |
| 03/08/1990 | WO1990002452A1 Mechanism for deriving accurate frequency reference for satellite communications burst demodulator |
| 03/08/1990 | DE3928573A1 Radiowellen-antwortsendervorrichtung in einem antwortsendersystem Radio wave transmitter answering device in a reply transmitter system |
| 03/07/1990 | CN1007115B Waveform shaping circuit |
| 03/06/1990 | US4907217 System and method of transmitting a complex waveform over a communication channel utilizing lincompex techniques |
| 02/28/1990 | EP0356090A2 Fibre optic data coupler |
| 02/28/1990 | EP0355587A2 Timing and carrier recovery in TDMA without preamble sequence |
| 02/27/1990 | US4905282 Feature negotiation protocol and dynamically adjustable retraining sequence for a high speed half duplex modem |
| 02/27/1990 | US4905256 Method and device for multistate modulation and demodulation with adjustable protection level |
| 02/27/1990 | US4905255 Decision directed gain control |
| 02/27/1990 | US4905177 High resolution phase to sine amplitude conversion |
| 02/27/1990 | US4904963 Staggered quadrature phase shift keyed laser modulator |
| 02/22/1990 | DE3828115A1 Method for coding information of one, two or more channels and/or frequency reduction of the alternating coding current or currents and transmission of the latter |
| 02/22/1990 | DE3828100A1 Method for coding information of one, two or more channels and/or frequency reduction of the alternating coding current or currents and transmission of the latter |
| 02/20/1990 | US4903335 Power-saving type receiver |
| 02/14/1990 | EP0354308A2 Integrated terahertz electromagnetic wave system |
| 02/13/1990 | US4901333 Data transmission systems |
| 02/13/1990 | US4901332 Noncoherent-coherent A.C. coupled base band AGC receiver |
| 02/13/1990 | US4901331 Trellis codes with passband spectral nulls |
| 02/13/1990 | US4901319 Transmission system with adaptive interleaving |
| 02/13/1990 | CA1265851A1 Superposed quadrature modulated baseband signal processor |
| 02/08/1990 | WO1990001235A1 High speed multi-channel phase detector |
| 02/08/1990 | DE3820985A1 Method and arrangement for cancelling the intermodulation distortion of a transmitter |
| 02/07/1990 | EP0353779A2 Preamble detection circuit for digital communications system |
| 02/07/1990 | EP0353694A2 Method for the redundancy-reducing error-correcting coding in digital radio relay systems using multi-level modulation |
| 02/06/1990 | US4899367 Multi-level quadrature amplitude modulator system with fading compensation means |
| 01/31/1990 | EP0353109A1 Method and apparatus for the demodulation of digital signals which are modulated in a continuous manner in phase and/or frequency with the help of a constant amplitude envelope carrier |
| 01/30/1990 | US4897857 FSK demodulating device |
| 01/30/1990 | US4897620 Continuous phase shift modulation system with improved spectrum control |
| 01/30/1990 | CA1265202A1 Simplified recovery of data signals from quadrature- related carrier signals |
| 01/24/1990 | EP0352159A1 Frequency drift tolerant method and device for demodulating constant envelope and continuous phase signals angularly modulated by a series of binary symbols |
| 01/24/1990 | EP0351914A1 Modulation device for phase and amplitude modulating a wave |
| 01/24/1990 | EP0351404A1 Process for timing synchronization. |
| 01/24/1990 | CN1039164A Quadrature amplitude modulation with line synchronization pulse for video telephone |
| 01/23/1990 | US4896336 Differential phase-shift keying demodulator |
| 01/23/1990 | US4896123 Quadraphase modulator |
| 01/23/1990 | CA1264824A1 Waveform shaping circuit |
| 01/17/1990 | EP0350999A2 Device to equalize and demodulate binary continuous phase modulated data signals with modulation index 0.5 |
| 01/16/1990 | US4894845 Receiver for a phase-shift keyed carrier signal |
| 01/16/1990 | US4894844 Signal constellations |
| 01/16/1990 | US4894841 Digital direct-sequence spread-spectrum modem |
| 01/16/1990 | US4894624 Combined amplitude modulator and frequency converter |
| 01/10/1990 | CN1038737A Correction circuit for digital quadrature-signal pair |
| 01/09/1990 | US4893341 Digital receiver operating at sub-nyquist sampling rate |
| 01/09/1990 | US4893317 Digital signals and frequency correction in a digital wireless system |
| 01/03/1990 | EP0349185A2 Demodulating phase modulated carrier signal |
| 01/03/1990 | EP0349169A2 Quadrature amplitude modulation with line synchronization pulse for video telephone |
| 01/03/1990 | EP0349064A1 Method of coherently demodulating a continuous phase, digitally modulated signal with a constant envelope |
| 01/03/1990 | EP0348968A2 Multilevel quadrature amplitude modulator capable of reducing a maximum amplitude of a multilevel quadrature amplitude modulated signal regardless of transmission data information or redundant information |
| 01/03/1990 | EP0348402A1 Timing error detector. |
| 01/02/1990 | US4891823 Channel encoder for generating rotationally invariant trellis codes |
| 01/02/1990 | US4891806 Constellation multiplexed inband secondary channel for voiceband modem |
| 01/02/1990 | US4891598 Variable bit rate clock recovery circuit |
| 12/28/1989 | WO1989012935A1 An arrangement for wireless transmission of signals via a serial two-conductor data bus |
| 12/27/1989 | EP0348305A2 Coded modulation communication system |
| 12/27/1989 | EP0348167A2 Digital communicating method and apparatus |
| 12/27/1989 | EP0348100A2 Phase jitter compensation arrangement using an adaptive IIR filter |
| 12/27/1989 | EP0347893A2 Programmable memory for an encoding system |
| 12/27/1989 | EP0347822A1 Filtering device using sinusoidal roll-off at the intermediate frequency in the receiver of a digital modem |
| 12/27/1989 | EP0347541A1 Method for digitally phase-modulating a carrier with data signals, and digital phase modulator for carrying out said method |
| 12/26/1989 | US4890302 Circuit for extracting carrier signals |
| 12/26/1989 | US4890283 High definition television augmentation channel |
| 12/20/1989 | EP0346800A1 Digital separation filter |
| 12/20/1989 | EP0346449A1 A variable frequency rate receiver |
| 12/19/1989 | US4888793 Phase correcting DPSK/PSK receiver with digitally stored phase correction derived from received data |
| 12/19/1989 | US4888792 Multi-level quadrature amplitude modulation and demodulation system |
| 12/19/1989 | US4888557 Digital subharmonic sampling down-converter |
| 12/14/1989 | WO1989012367A1 Synchronous receiver for minimum shift keying transmission |
| 12/13/1989 | EP0346036A2 Method of quadrature-phase amplitude modulation |
| 12/13/1989 | EP0345515A2 Method for carrier recovery |