Demodulator of sampled data FM signals from sets of four success

Details Demodulator of sampled data FM signals from sets of four success Demodulator of sampled data FM signals from sets of four success

1983-07-29

1985-10-15

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329110, 329126, 329137, 329145, 375 80, 455214, 455337, H03D 318, H03D 300

Patent

active

045477370

ABSTRACT:
An FM signal is demodulated by the technique of sequentially sampling the signal and combining the samples to approximate the standard formula for the instantaneous frequency deviation ##EQU1## where the dots indicate the first derivative of the samples. The FM signal is assynchronously sampled at approximately four times the carrier frequency rate. Alternate samples are substantially equivalent to orthogonal components x and y of the FM signal. At least four successive samples are successsively stored so that at least four of the lastmost samples are always available for processing. Particular x samples are summed to create averaged samples x.sub.n and differenced to create approximations of derivatives x.sub.n of the x signal components and particular y samples are similarly summed and differenced to create averaged values y.sub.n and derivatives y.sub.n. These values are used in the equation for F.sub.n. In terms of successive samples, S, the equation for F.sub.n becomes

REFERENCES:
patent: 3135917 (1964-06-01), Best et al.
patent: 3470478 (1969-09-01), Crafts
patent: 4224575 (1980-09-01), Mosley et al.
patent: 4242641 (1980-12-01), Houdard
patent: 4286223 (1981-08-01), Shearer
patent: 4338579 (1982-07-01), Rhodes
patent: 4344039 (1982-08-01), Sugiura et al.
patent: 4345211 (1982-08-01), Longworth
patent: 4368434 (1983-01-01), Miller et al.
patent: 4455533 (1984-06-01), Moraillon
F. G. A. Coupe, "Digital Frequency Discriminator", Electronics Letters, Aug. 1979, vol. 15, No. 16, pp. 489-490.
S. Schepers, "Wie Demoduliert man Digitalisierte FM-Trager?", Funk-Technik 37 (1982) Heft 10, pp. 418-420.
P. Draheim, "Digitalisierung der Video-Signalverarbeitung Beispiel: Video-Kassettenrecorder", Elektronik, 10/21/82, pp. 121-124.
Mattei et al., "Symbol Synchronizer for MPSK Signals" U.S. Ser. No. 340,771, filed Jan. 1, 1982.

Affiliated with

Also associated with

Rating

Demodulator of sampled data FM signals from sets of four success does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Demodulator of sampled data FM signals from sets of four success, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Demodulator of sampled data FM signals from sets of four success will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2431962