v.Connect : A Singing Synthesis System Enabling Users to Control Vocal Tones
Makoto Ogawa, Syunji Yazaki · 2012
Since the release of Hatsune Miku, interets in singing synthesis increase. For example, a singing synthesis system, UTAU, has been developed as a freeware. Most of these systems, however, lack of the function that users can mix vocal tones at any times. Controling tonal changes in singing requires a large amount of time and data for synthesis. We have developed a singing synthesis system, v.Connect, which connects corresponding phonemes with a time-stretching function to enable users to control tonal changes in singing by specifying the rate of voice morphing. The system processes voice signals with WORLD, a voice synthesis and analysis system, and uses corpora of various tonal voices consisting of Mel cepstra and excitation signals compressed by Vorbis. We constructed a corpus, ”Namine Ritsu Connect”, using the proposed method. It was found that the size of the corpus was two times larger than that of raw waves, and that synthesis from the corpus was 1.7 to 2.2 times faster than that from raw waves. Degradation caused by compression was not sensed subjectively. 1. は じ め に