| 摘要 |
PROBLEM TO BE SOLVED: To estimate transition of a basic frequency of an acoustic signal with high accuracy.SOLUTION: Each frequency corresponding to a peak of likelihood that each frequency on a frequency axis corresponds to a basic frequency of an acoustic signal x is identified as a candidate frequency FC[i] every unit period. An index calculation part 72 calculates a likelihood shape index Y1[i, j] according to similarity between a shape of the peak corresponding to the candidate frequency FC[i] during each unit period and a shape of the peak corresponding to the candidate frequency FC[j] during the previous unit period and calculates transition probability T[i, j] between the candidate frequency FC[j] and the candidate frequency FC[i] in accordance with the likelihood shape index Y1[i, j]. |
