Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1989-02-28
1989-08-29
Laroche, Eugene R.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329122, 329168, H03D 318
Patent
active
048620980
ABSTRACT:
A detector for a first continuous-wave-modulation signal is supplied an unmodulated carrier signal in addition to the first continuous-wave-modulation signal. Means are provided for modulating the unmodulated carrier signal responsive to output signal from the detector to generate a second continuous-wave-modulation signal encoding a previous value of output signal, as delayed to provide a predicted input signal, in the same way the first continuous-wave-modulation signal encodes the input signal. The first and second continuous-wave-modulation signals are linearly combined so as to cancel the correlated portions of them and to develop a third continuous-wave-modulation signal with suppressed carrier, which is detected to recover an error signal. This error signal is combined with the predicted input signal obtained by delaying a previous value of said output signal, thereby to generate the current output signal of the detector. The continuous-wave-modulation can be amplitude-modulation, pulse-amplitude-modulation, narrowband phase-modulation, narrowband frequency-modulation or narrowband combined-frequency-and-phase-modulation, by way of example.
REFERENCES:
patent: 4403194 (1983-09-01), Talbot
patent: 4495475 (1985-01-01), Mark et al.
patent: 4731844 (1988-03-01), Christopher
Daniel Denaro et al., "The Easy Way to Interface an LVDT to Digital", Analogue Dialogue, 20-2, 1986, pp. 19-21.
L. M. DeVito, "A 10 ppm Resolution Interface Circuit for a Position Transducer", 1988, IEEE International Solid State Circuits Conf, Feb. 18, 1988, pp. 194-195.
"LVDT to Digital Converter", catalog published by Analog Devices, Norwood, Mass., circa 1986.
"HSD/HRD 1024 Improved, Second Generation Synchro(Resolver)-to-Digital Converter Microprocessor Compatible 14-bit Hybrid", catalog by Natel Eng. Co., Inc., Simi Valley, Calif., 1986.
S. Haykin, Communications Systems, 2nd edition, John Wiley & Sons, 1983, pp. 125-135.
"Adaptive Noise Cancelling: Principles & Applications", B. Widrow et al., Proceedings of the IEEE, vol. 63, No. 12, pp. 1692-1716, Dec. 1975.
"Stationary and Non-Stationary Learning Characteristics of the LMS Adaptive Filter", B. Widrow et al., Proceedings of the IEEE, vol. 64, No. 8, pp. 1151-1162, Aug. 1976.
Thompson Barbara A.
Yassa Fatby F.
Davis Jr. James C.
General Electric Company
LaRoche Eugene R.
Limberg Allen L.
Pascal Robert J.
LandOfFree
Continuous-wave-modulation detectors using prediction methods does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Continuous-wave-modulation detectors using prediction methods, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Continuous-wave-modulation detectors using prediction methods will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2241160