Sampling rate converting apparatus and sampling rate converting method

A sampling rate converting method in a sampling rate converting apparatus that performs sampling frequency conversion to an input signal sampled at a predetermined sampling period the sampling rate converting method comprising:

• a sampling-phase detecting step of calculating a sampling phase based on sampling timing after the sampling frequency conversion for each the operation reference clock, based on a ratio between an arbitrary clock frequency and a sampling frequency after the sampling frequency conversion;
• a sampling-clock detecting step of detecting a sampling period after the sampling frequency conversion, based on the sampling phase;
• a filtering step of applying filtering to the input signal and generating a post-conversion signal based on a signal after the filtering and the sampling period, the post-conversion signal being a signal after the sampling frequency conversion;
• and
• a filter control step of setting a filter coefficient used for the filtering, based on the sampling phase.