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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 |
| 4817116 |
Digital radio communication system utilizing quadrature modulated carrier waves |
Mar. 28, 1989 |
| 4807251 |
PSK modem system with improved demodulation reliability |
Feb. 21, 1989 |
| 4795986 |
Method and circuit for carrier synchronism recovery in PSK coherent demodulators |
Jan. 3, 1989 |
| 4794341 |
Digital filters and demodulators |
Dec. 27, 1988 |
| 4794623 |
Recovery of carrier signal from QAM double sideband suppressed carrier IF signal for use in synchronous demodulation |
Dec. 27, 1988 |
| 4780887 |
Carrier recovery circuitry immune to interburst frequency variations |
Oct. 25, 1988 |
| 4769816 |
Qpsk demodulator |
Sep. 6, 1988 |
| 4737728 |
Digitally processed demodulator for quadrature modulated signals |
Apr. 12, 1988 |
| 4675619 |
Multiple quadrature-phase amplitude modulating system capable of reducing a peak amplitude |
Jun. 23, 1987 |
| 4674105 |
Digital signal processor |
Jun. 16, 1987 |
| 4669095 |
Maximum distance from zero crossing MSK demodulator |
May. 26, 1987 |
| 4660213 |
Signal structure for data communication |
Apr. 21, 1987 |
| 4647863 |
Saw transition detector for PSK signals |
Mar. 3, 1987 |
| 4646325 |
Index decoder for digital modems |
Feb. 24, 1987 |
| 4635279 |
Arrangement for coherently generating sinusoids of different frequencies, and angle modulation data receiver using the arrangement |
Jan. 6, 1987 |
| 4634990 |
Apparatus for demodulating differential phase shift keyed signals |
Jan. 6, 1987 |
| 4631486 |
M-phase PSK vector processor demodulator |
Dec. 23, 1986 |
| 4583047 |
Reception circuit for a wave modulated at one time in frequency by an analog signal and at another time in phase by a digital signal |
Apr. 15, 1986 |
| 4577335 |
Coherent data communications technique |
Mar. 18, 1986 |
| 4538284 |
Signal structures with data encoding/decoding for QCM modulations |
Aug. 27, 1985 |
| 4514697 |
Coherent phase shift keyed demodulator with improved sampling apparatus and method |
Apr. 30, 1985 |
| 4498050 |
Demodulation device for composite PSK-PSK modulated waves |
Feb. 5, 1985 |
| 4414675 |
MSK and OK-QPSK signal demodulator |
Nov. 8, 1983 |
| 4379266 |
PSK Demodulator with automatic compensation of delay induced phase shifts |
Apr. 5, 1983 |
| 4371839 |
Differentially coherent signal detector |
Feb. 1, 1983 |
| 4338579 |
Frequency shift offset quadrature modulation and demodulation |
Jul. 6, 1982 |
| 4242641 |
Methods and apparatus for demodulating a differentially phase-modulated signal |
Dec. 30, 1980 |
| 4241454 |
Hard limiting acquisition technique for PSK carrier detector |
Dec. 23, 1980 |
| 4158105 |
Clock extraction device for double-binary phase-shift keying system |
Jun. 12, 1979 |
| 4110706 |
Phase synchronizing circuit |
Aug. 29, 1978 |
| 4071829 |
Coherent phase detector using a frequency discriminator |
Jan. 31, 1978 |
| 4065722 |
Demodulation method and circuit for discretely modulated ac signals |
Dec. 27, 1977 |
| 4054841 |
Differential demodulators using surface elastic wave devices |
Oct. 18, 1977 |
| 3991377 |
Differential phase shift keying demodulator |
Nov. 9, 1976 |
| 3990015 |
Differential phase shift keyed detector utilizing a circulating memory |
Nov. 2, 1976 |
| 3980962 |
Demodulators |
Sep. 14, 1976 |
| 3973211 |
Combiner-demodulator for phase shift keyed suppressed carrier signals received over two transmission paths |
Aug. 3, 1976 |
| 3971999 |
Coherent phase demodulator for phase shift keyed suppressed carrier signals |
Jul. 27, 1976 |
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