Frequency demodulator having circuit cancelling undesired signal

Details Frequency demodulator having circuit cancelling undesired signal Frequency demodulator having circuit cancelling undesired signal

1988-07-21

1990-03-13

Grimm, Siegfried H.

Demodulators

Frequency modulation demodulator

Having specific distortion, noise or other interference...

329316, 358327, 358328, 358 36, 358167, 455305, H04N 521, H04N 987

Patent

active

049085816

ABSTRACT:
An FM signal obtained by modulating a carrier f.sub.c with a signal f.sub.s is demodulated by a frequency demodulator to obtain a demodulated signal which contains a lower sideband component as an undesired moire component. A moire component generator generates an mf.sub.c -nf.sub.s component (m and n: natural numbers) from the demodulated signal or generates an nf.sub.1 -(n-m)f.sub.c component (f.sub.1 : first lower sideband component of the FM signal) from the FM signal. A subtractor subtracts an output of the moire component generator from the demodulated signal so as to thereby eliminate the undesired moire component. Furthermore, to eliminate a cross-modulation moire due to crosstalk of a low-frequency signal f.sub.L, the moire component generator generates a 2f.sub.L component from the FM signal.

REFERENCES:
patent: 4052740 (1977-10-01), Coleman, Jr.
patent: 4223282 (1980-09-01), de Boer
patent: 4246541 (1981-01-01), Ishigaki
patent: 4291330 (1981-09-01), Hirai
patent: 4561113 (1985-12-01), Naito
patent: 4597021 (1986-06-01), Yamamitsu et al.
patent: 4723175 (1988-02-01), Ishinoi et al.

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