SPEECH SYNTHESIS METHOD, DEVICE, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To maintain continuity of intonation of a synthetic speech to select a candidate phoneme so that the synthetic speech becomes high quality even for such a target that voiced sounds are connected to each other via voiceless sounds.

SOLUTION: A speech synthesis method includes: a preceding voiced sound candidate phoneme search sub-step of searching a candidate phoneme which is selected as a candidate phoneme suitable for a target to be the (i-k)-th voiced sound in which k is 2 or more and k is the minimum (hereafter, called as the (i-k)-th candidate phoneme) when the i-th target (i is a natural number equal to or more than 3) is the voiced sound, and the (i-1)-th target is a voiceless sound; a connection F0 sub-cost calculation sub-step of calculating a connection F0 sub-cost from an F0 value at a terminal position of the (i-k)-th candidate phoneme and F0 value groups at the head positions of the respective candidate phonemes of the i-th candidate phoneme group; and a selection sub-step of selecting one candidate phoneme suitable for the i-th target from the i-th candidate phoneme group based on the connection F0 sub-cost.

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