Sampling frequency shift amount estimating apparatus, shift amount estimating method, and shift amount estimating program

摘要

PROBLEM TO BE SOLVED: To solve the problem in which, when a sampling frequency is non synchronous in a reproduction system and recording system, it is hard to obtain impulse response characteristics with high accuracy.SOLUTION: A sampling frequency deviation-amount estimation device is configured to: sample a recording signal obtained through recording a measurement signal as shifting a sample frequency at a first interval within a first frequency range; set a narrower second frequency range on the basis of a plurality of SN ratios of post-resampled first recording signals; sample the recording signal at a second interval narrower than the first interval as shifting the sampling frequency within the second frequency range; set a narrower third frequency range on the basis of a plurality of SN ratios of post-resampled second recording signals; convert the sampling frequency of the second recording signal in which the SN ratio is highest within the third frequency range and at a third interval narrower than the second interval by a linear interpolation; and estimate an amount of deviation between a source of the measurement signal and the sampling frequency on the basis of a plurality of SN ratios of post-linearly interpolated third recording signals.SELECTED DRAWING: Figure 2