| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a filter adjustment device capable of automatically compensating for variations in filter characteristics with high precision based on a result of detecting amplitudes, without performing phase comparison. <P>SOLUTION: According to an embodiment, the filter adjustment device comprises a filter, a reference signal generation module, a control module, an amplitude detection module, and an adjustment module. Filter characteristics of the filter are controlled according to a characteristics control signal. The reference signal generation module generates a reference signal with an amplitude determined according to an amplitude control signal, and supplies the generated reference signal to the filter. The control module sets different filter characteristics of the filter according to the characteristics control signal, and sets different amplitude values of the reference signal according to the amplitude control signal. In a state in which the different filter characteristics of the filter are set according to the characteristics control signal, the amplitude detection module detects amplitude of an output signal of the filter with respect to the reference signal with different amplitudes. The adjustment module determines a desired characteristics control signal that achieves desired filter characteristics according to a plurality of amplitude values detected by the amplitude detection module. <P>COPYRIGHT: (C)2012,JPO&INPIT |
