基频是发浊音时声带振动频率,通常用F0表示.在一个音节或连续的语音段中,F0是随时间变化的,这种变化的轨迹形成了基频曲线.基频曲线的走势可以反映出语句的重音、语调等韵律信息,所以对基频曲线的描述和研究就显得尤为重要.该文首先提出了一种基频曲线描述方法,即导数域编码方法,同时探讨了该编码方法在语音发音质量评价中对韵律的作用.实验结果表明基于该描述方法能够提高英语发音语调质量评价的性能,主观和客观评价的相关性由原来的基于基音极值差的0.38提高到0.49.%Fundamental frequency (or pitch), usually named as F0, is the vibration frequency of vocal*cord during the production of voiced sounds. In a syllable or continuous voice paragraph, F0 changes with time and yields the fundamental frequency (or pitch) curves. It is particularly important to descript and investigate the F0 curve because it usually reflects the rhythm information, such as tone and stress. This paper first proposes a new method to describe F0 curve-the derivative domain codes, and then it discusses the role of the coding method on the rhythm in the evaluation of speech pronunciation. Experimental results show that the method can be used to evaluate the English prosody. The correlation coefficient between the subjective and objective scores of pitch extreme difference improves from 0. 38 to 0. 49.
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