@techreport{oai:ipsj.ixsq.nii.ac.jp:00232533,
 author = {岡田, 翔太 and 北村, 悠 and 齋藤, 大輔 and 峯松, 信明 and Shota, Okada and Yu, Kitamura and Daisuke, Saito and Nobuaki, Minematsu},
 issue = {63},
 month = {Feb},
 note = {歌唱の際，裏声は高音発声や歌唱表現として重要である．しかし，地声での歌声合成器が普及する一方，裏声を合成するモデルはまだ十分に構築されていない．本研究では，地声と裏声の音源波形状の差異に着目し，音源波形状を変形する 2 種類のフィルタを作成することで，地声から裏声への声区変換を行った．この変換は，擬似的に声門波の声門開放時間率に対応するパラメータの操作と，非周期性指標の操作によって行った．このような変換で得られた裏声について，裏声らしさ，自然さの観点での主観評価実験を行った．その結果，中音域では声門開放時間率を大きくするほど裏声に近づくが，自然な音声ではなくなるという評価が得られた．また，非周期性指標を増大させると，音声の裏声度が上がるという結果が得られた．一方で，高音域では上記の傾向は見られず，音域によって適当なパラメータ制御が異なることも示唆された．, When singing, falsetto is important as a high-pitched singing and expressive technique. However, while vocal synthesizers for modal voice are widespread, models for falsetto are not yet sufficiently constructed. In this study, we focused on the difference in the shape of glottal sound wave between modal and falsetto voices, and conducted modal-to-falsetto vocal register conversion by creating two types of filters that transform the shape of glottal sound wave. This transformation was carried out through the operation of parameters related to pseudo open quotient, and of aperiodicity. We conducted subjective evaluations about falsetto-likeness and naturalness of the falsetto obtained through this transformation. The results indicated that in the mid-pitched range, increasing open quotient tended to make the voice more falsetto-like, but at the expense of naturalness. In addition, increasing aperiodicity had a positive effect on the falsetto-likeness. However, in the high-pitched range, these trends were not observed, suggesting that appropriate parameter control depends on the pitch.},
 title = {音源波形状に着目した地声-裏声変換と音源波パラメータの制御},
 year = {2024}
}