SOUND ANALYSIS APPARATUS AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To precisely estimate a fundamental frequency by using preknowledge characteristic of a musical instrument when finding the frequency of a sound being generated from an input sound signal by EM algorithm.

SOLUTION: A form estimation step 413 selects a peak of a sound likely to be generated out of peaks of weights during sequential updating of weights corresponding to various fundamental frequencies in an E step and an M step 411, so as to satisfy a constraint defined by the sound source structure data 413F. A predistribution imparting step 414 imparts a predistribution to the weights of the tone models so as to emphasize the selected peak.

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