| 摘要 |
An FM signal obtained by modulating a carrier fc with a signal fs 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 mfc-nfs component (m and n: natural numbers) from the demodulated signal or generates an nf1-(n-m)fc component (f1: 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 fL, the moire component generator generates a 2fL component from the FM signal.
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