PITCH ESTIMATION DEVICE, PITCH ESTIMATION METHOD AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To reduce influence in which momentary variation of a feature amount affects estimation of pitch of object sound.

SOLUTION: A function estimation section 22 estimates a probability density function P of a fundamental frequency for each of a plurality of frames into which a sound signal V is divided. The probability density function P indicates a weight value of a sound model, when modeling the sound signal V of each frame as a mixed distribution of a plurality of sound models for modeling a harmonics structure. A smoothing section 24A suppresses temporal variation of a function value of the probability density function P by calculating an average of the probability density function P over the plurality of frames. A pitch specifying section 26 estimates a fundamental frequency F0 of the sound signal V from a probability density function P after processing by the smoothing section 24.

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