汉语韵律词F0曲线的优化

汉语韵律词内部音节重音的强弱对总的F0曲线的特征有很大影响。本文参考生成F0曲线的数学优化模型,提出了对由孤立单音节调型曲线串接而成的汉语韵律词的F0曲线的连续性、平滑性、曲线形状、平均值进行整体优化的x2估计方法,实现了在重音作用下的F0曲线的优化。在谐波+噪声合成系统上实验研究了汉语三音节韵律词的64种不包含轻声的调型组合和10种结尾为轻声的调型组合的F0曲线的优化效果,展示优化过程中三个控制参数——平滑因子(smooth)、音节重音强度(stress)、音节F0形状失真度(Distor-tion)对F0曲线整体形状的控制效果和参数取值的有效范围。非正式的听觉实验表明合成语音的自然度有明显提高。

Optimization of F0 Contour of Chinese Prosodic Word

The F0 contour of Chinese prosodic word is influenced greatly by the stress of its syllables.Based on the mathematical model to produce the optimized F0 contour~([1]),this paper proposes a method of x~2 fitting to optimize the continuity,the smoothness,the shape and the average feature of F0 contour of prosodic word,which can achieve the optimization of F0 contour under the function of the stress of the responding syllables.Based on the HNM speech synthesis system,we show the optimized results for the 64 tone series without soft tone and the 10 tone series ending with soft tone.The effects and the value ranges of the control parameters(the smooth factor,the stress and the distortion of syllables) are also studied.The informal listening test shows,the naturalness of synthesized speech has been improved obviously.