Demodulator for sampled data FM signals

Details Demodulator for sampled data FM signals Demodulator for sampled data FM signals

1989-05-02

1990-03-20

Grimm, Siegfried H.

Demodulators

Frequency modulation demodulator

Having specific distortion, noise or other interference...

329341, 329345, 375 82, H03D 300, H03K 906

Patent

active

049104691

ABSTRACT:
A sampled data FM demodulator samples the FM signal at intervals of (2n.pi.+.pi./2) radians relative to the FM carrier. Pairs of samples S.sub.n and S.sub.n+1 are square and multiplied together to generate sample values S.sub.n.sup.2, S.sub.n+1.sup.2 and S.sub.n S.sub.n+1. These sample values are lowpass filtered in a filter having a cutoff frequency which substantially attentuates at least the second harmonic of the FM carrier. The low pass filtered samples are then combined according to the relation S.sub.n S.sub.n+1 /.sqroot.S.sub.n.sup.2 S.sub.n+1.sup.2 to generate demodulated output samples.

REFERENCES:
patent: 4455533 (1984-06-01), Moraillon
patent: 4528511 (1985-07-01), Smith
patent: 4547737 (1985-10-01), Gibson
patent: 4737729 (1988-04-01), Haussmann
patent: 4750214 (1988-06-01), Hart et al.
F. G. A. Coupe, Digital Frequency Discriminator, Electronics Letters, vol. 15, No. 16, Aug. 1979, pp. 489-490.
Charles Schepers "Wie Demoduliert Man Digitalisierte FM-Trager", Funk-Technik 37 (1982) Heft 10, pp. 418-420.

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