| 摘要 |
<p>An interference wave signal frequency is highly accurate and the interference wave signal is surely removed. A controller 51 of an interference wave signal remover 50 detects the interference wave signal based on a frequency scanning result by an entire-range frequency scanner 53, and sets a notch filter 52 to attenuate the interference wave signal frequency. A local scan frequency band BWf L of a local frequency scanner 54 is set by having the interference wave signal frequency as its central frequency, local scan frequencies BIN L are set so that frequency bands overlap with each other between adjacent frequency BIN. The local frequency scanner 54 frequency-scans input signals to the notch filter 52. The controller 51 calculates a frequency error ´f of the interference wave signal frequency based on the frequency scanning result by the local frequency scanner 54, corrects the interference wave signal frequency which is based on the frequency scanning result by the entire-range frequency scanner 53 by the frequency error ´f, and updates the setting of the notch filter 52.</p> |
