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Class Information
Number: 329/304
Name: Demodulators > Phase shift keying or quadrature amplitude demodulator
Description: Subject matter where the demodulator extracts the modulating signal from a signal which has undergone phase shift keying modulation or quadrature amplitude modulation.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5138272 |
Microwave demodulator for digital radio links using QAM type modulation |
Aug. 11, 1992 |
| 5134634 |
Multilevel quadrature amplitude demodulator capable of compensating for a quadrature phase deviation of a carrier signal pair |
Jul. 28, 1992 |
| 5131014 |
Apparatus and method for recovery of multiphase modulated data |
Jul. 14, 1992 |
| 5128967 |
Symbol state trellis maximum likelihood detection method |
Jul. 7, 1992 |
| 5126682 |
Demodulation method and apparatus incorporating charge coupled devices |
Jun. 30, 1992 |
| 5122758 |
Differential phase demodulator for PSK-modulated signals |
Jun. 16, 1992 |
| 5121070 |
Phase demodulator for PSK-modulated signals |
Jun. 9, 1992 |
| 5117440 |
Digital quadrature phase detection |
May. 26, 1992 |
| 5090027 |
Coherent PSK demodulator with adaptive line enhancer |
Feb. 18, 1992 |
| 5090023 |
Spread spectrum communication system |
Feb. 18, 1992 |
| 5089822 |
Interrogation signal processor for air traffic control communications |
Feb. 18, 1992 |
| 5079513 |
Demodulator and radio receiver having such a demodulator |
Jan. 7, 1992 |
| 5079512 |
Quadrature demodulation of a data sequence following a particular signal sequence with a local reference carrier signal having a frequency different from a received carrier signal |
Jan. 7, 1992 |
| 5077531 |
PSK signal demodulation system |
Dec. 31, 1991 |
| 5067140 |
Conversion of analog signal into I and Q digital signals with enhanced image rejection |
Nov. 19, 1991 |
| 5067139 |
Coherent detector for QPSK modulation in a TDMA system |
Nov. 19, 1991 |
| 5057786 |
Quadrature amplitude modulation wave demodulator provided with band-pass filters for fixed equalizer |
Oct. 15, 1991 |
| 5056122 |
Phase-shift keyed demodulation apparatus |
Oct. 8, 1991 |
| 5040192 |
Method and apparatus for optimally autocorrelating an FSK signal |
Aug. 13, 1991 |
| 5025455 |
Phase ambiguity resolution for offset QPSK modulation systems |
Jun. 18, 1991 |
| 5017883 |
Multiple symbol differential detection |
May. 21, 1991 |
| 5014316 |
Compatible quadrature amplitude modulation detector system |
May. 7, 1991 |
| 5005186 |
Digital demodulator apparatus |
Apr. 2, 1991 |
| 5001724 |
Method and apparatus for measuring phase accuracy and amplitude profile of a continuous-phase-modulated signal |
Mar. 19, 1991 |
| 5001723 |
Sinusoidal M-ary orthogonal keyed decoding |
Mar. 19, 1991 |
| 4998261 |
Spread spectrum signal demodulator |
Mar. 5, 1991 |
| 4989220 |
Method and apparatus for demodulating a class of M-ary phase shift keyed (PSK) signals |
Jan. 29, 1991 |
| 4985688 |
Modulation system capable of accurately compensating for nonlinearities of an amplifier connected thereto |
Jan. 15, 1991 |
| 4975927 |
Demodulator with composite transversal equalizer and eye detection clock synchronizer |
Dec. 4, 1990 |
| 4968955 |
Carrier phase synchronizing circuit capable of recovering carrier phase synchronization at a short time |
Nov. 6, 1990 |
| 4965810 |
Digital differential phase-shift keyed decoder |
Oct. 23, 1990 |
| 4942591 |
Multiple phase PSK demodulator |
Jul. 17, 1990 |
| 4922206 |
Method of demodulation using split delay line |
May. 1, 1990 |
| 4912728 |
Analog-to-digital converter for stepped square QAM demodulators |
Mar. 27, 1990 |
| 4894845 |
Receiver for a phase-shift keyed carrier signal |
Jan. 16, 1990 |
| 4888792 |
Multi-level quadrature amplitude modulation and demodulation system |
Dec. 19, 1989 |
| 4885756 |
Method of demodulating digitally modulated signals, and apparatus implementing such a method |
Dec. 5, 1989 |
| 4881246 |
Method and apparatus for demodulating a class of M-ary phase shift keyed (PSK) signals |
Nov. 14, 1989 |
| 4881049 |
QAM modulator/demodulator |
Nov. 14, 1989 |
| 4871974 |
Coherent phase shift keyed demodulator |
Oct. 3, 1989 |
| 4864244 |
Stepped square-QAM demodulator utilizing all signal points to generate control signals |
Sep. 5, 1989 |
| 4859956 |
Validity decision circuit capable of correctly deciding validity of an error signal in a multilevel quadrature amplitude demodulator |
Aug. 22, 1989 |
| 4860319 |
Apparatus for compensating for phase hits |
Aug. 22, 1989 |
| 4860320 |
Method for recovering a control signal for controlling the phase of a local carrier signal |
Aug. 22, 1989 |
| 4855689 |
Phase lock loop with switchable filter for acquisition and tracking modes |
Aug. 8, 1989 |
| 4853943 |
Manchester code clock and data recovery system |
Aug. 1, 1989 |
| 4849706 |
Differential phase modulation demodulator |
Jul. 18, 1989 |
| 4841547 |
Digital communication system |
Jun. 20, 1989 |
| 4833416 |
QPSK/BPSK demodulator |
May. 23, 1989 |
| 4829260 |
Phase-shift keyed carrier recovery |
May. 9, 1989 |
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