| 摘要 |
There is provided a filter characteristic adjusting apparatus and a filter characteristic adjusting method which can avoid an increase in circuit scale of the filter characteristic adjusting apparatus, and can speedily adjust a characteristic frequency of the filter to a desired frequency. When performing characteristic adjustment for the filter, the test signal generation unit ( 31 ) generates a test signal (s 14 ) which is a pulse signal having the same frequency as the characteristic frequency of the filter ( 10 ) on the basis of a reference signal (s 17 ), and a phase-shifted test signal (s 14 ') that is obtained by shifting the phase of the test signal (s 14 ) by a predetermined amount with a phase shift unit ( 32 ) in a control signal generation unit ( 33 ) is compared with a filter output signal (s 16 ) that is obtained by inputting the test signal (s 14 ) into the filter ( 10 ) to obtain a phase difference between the signals, and then the phase difference is subjected to a binary search to generate a control signal (s 11 ).
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