Voice synthesis system

TLDR: In this paper, the authors proposed a method to obtain a synthesized voice with good balance in time length between vocal sounds when the voicing speed of the synthesised voice is varied by determining the section length of the stationary part of a vowel according to mora length.

Abstract: PURPOSE: To obtain a synthesized voice with good balance in time length between vocal sounds when the voicing speed of the synthesized voice is varied by determining the section length of the stationary part of a vowel according to mora length which varies with the voicing speed of the synthesized voice by using a function which is set for each vowel, and expanding or contracting and connecting a voice parameter according to the section length. CONSTITUTION: A phoneme data read part 1 reads phoneme data out of a phoneme data file 2 according to vocal sound sequence information which is inputted. Then a vowel length determination part 3 determines the length of the stationary part of the vowel according to the supplied mora information. Then the function indicating the length relation of the vowel stationary part is used to determine and secure the length of the vowel according to the mora length, and the length of a transition part from a vowel to a consonant or vice versa is found to control the time length of the phoneme, thereby connecting it. Consequently, even when the voicing speed of the synthesized voice is varied, the synthesized voice with good balance in the time length between phonemes is obtained according to the mora length. COPYRIGHT: (C)1991,JPO&Japio