| 摘要 |
PROBLEM TO BE SOLVED: To improve estimation accuracy of a fundamental frequency as a whole, even when a waveform of an input sound signal is unstable in an attack period. SOLUTION: In an attack detection 1a, attack detection is performed by dividing an input sound signal into frames. In an estimation 41 of a probability density function of a fundamental frequency, the probability density function of the fundamental frequency is estimated for each frame by an Expectation-Multiplication (EM) algorithm. In a continuous tracking 42 of the fundamental frequency by a multi-agent model, the fundamental frequency is estimated from the probability function. At that time, control for switching over calculation modes of the process 41 and 42 for obtaining the fundamental frequency is performed, depending on whether or not, a frame to be processed is in the attack period. COPYRIGHT: (C)2008,JPO&INPIT
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