| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a filter circuit in which a center frequency of a band-pass filter can be easily and optionally changed, and a method and program for controlling the same. <P>SOLUTION: A filter circuit 1 includes a band-pass filter 2 which has a changeable center frequency, and outputs a first output signal by filtering the input signal; an adjustment signal generation unit 3 for generating an adjustment signal containing a first signal having a frequency of f1 and a second signal having a frequency of f2; a band-pass filter 4 outputting a second output signal having the changeable center frequency by filtering the adjustment signal; and a control signal generation circuit 5 which detects an intensity of the second output signal and generates a control signal for controlling the center frequency of the band-pass filter 2 and band-pass filter 4. <P>COPYRIGHT: (C)2013,JPO&INPIT |
