| 摘要 |
PROBLEM TO BE SOLVED: To remove an interference wave if the frequency of the interference wave varies with the lapse of time.SOLUTION: A receiver circuit includes a frequency detection circuit 3 for detecting the reception spectrum of the interference wave which includes higher power than specific power P1 among the reception spectra of signals passing through a band-pass filter 2. A frequency band, which includes a center frequency (fnh) of a reception spectrum detected by the frequency detection circuit 3, is set to a cutoff band B. A variable band rejection filter 4 cuts off the interference wave of the center frequency (fnh) which is included in the radio signal and output from an antenna 1, to pass a signal (signal in a band B' other than the cutoff band B) other than the interference wave. |
