| 摘要 |
<p>A FM signal obtained by modulating a carrier fc with a signal fs is demodulated by a frequency demodulator to obtain a demodulated signals which contains a lower sideband component as an undesired moire component. A moire component generator generates a mfc - nfs component (m, n: natural number) from the demodulated signal or generates a 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 thereby to eliminate the undesired moire component. Further, 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.</p> |
