Patent ID: 7858869
Filing Date: 2010-12-28
Classification: G10H

Abstract:
1. A sound analysis apparatus comprising: a performance sound acquisition part that externally acquires a performance sound of a musical instrument; a target fundamental frequency acquisition part that acquires a target fundamental frequency to which a fundamental frequency of the performance sound acquired by the performance sound acquisition part should correspond; a fundamental frequency estimation part that employs tone models which are associated with various fundamental frequencies and each of which simulates a harmonic structure of a performance sound generated by a musical instrument, then defines a weighted mixture of the tone models to simulate frequency components of the performance sound, then sequentially updates and optimizes weight values of the respective tone models so that a frequency distribution of the weighted mixture of the tone models corresponds to a distribution of the frequency components of the performance sound acquired by the performance sound acquisition part, and estimates the fundamental frequency of the performance sound acquired by the performance sound acquisition part based on the optimized weight values; and a decision part that makes a decision on a fundamental frequency of the performance sound, which is acquired by the performance sound acquisition part, on the basis of the target fundamental frequency acquired by the target fundamental frequency acquisition part and the estimated fundamental frequency of the performance sound.