Freyman R L, Nerbonne G P
Department of Communication Disorders, University of Massachusetts, Amherst 01003.
J Speech Hear Res. 1989 Sep;32(3):524-35. doi: 10.1044/jshr.3203.524.
The purpose of this study was to evaluate the extent to which variations in the consonant-vowel (C-V) intensity ratio could account for variations in speech intelligibility among the productions of 10 talkers. Fifty normal-hearing individuals listened in noise to syllables consisting of voiceless consonants followed by the vowel /a/ under three conditions in which: (a) C-V ratio varied naturally as produced by the talkers, and the stimuli were calibrated according to vowel intensity; (b) C-V ratios were increased and equated via digital signal processing; and (c) C-V ratios were unmodified, but the syllables were calibrated according to consonant level rather than vowel level. Results indicated that variations in C-V ratio explained a great deal of the variation in the intelligibility of some consonants (/s, S, tS/) but not others (the voiceless stops). This difference may well be due to differences in audibility between the two groups of consonants when they are presented at similar consonant-to-noise ratios. The majority of the data suggest that the importance of C-V ratio is related to the intensity of consonants but is independent of the ratio per se between consonant and vowel levels.
本研究的目的是评估辅音-元音（C-V）强度比的变化在多大程度上能够解释10名讲话者发音中言语可懂度的变化。50名听力正常的个体在噪声环境中听取由清辅音后接元音/a/组成的音节，实验设置了三种条件：（a）C-V比随讲话者的自然发音而变化，且刺激音根据元音强度进行校准；（b）通过数字信号处理提高并使C-V比相等；（c）C-V比未作修改，但音节根据辅音水平而非元音水平进行校准。结果表明，C-V比的变化解释了部分辅音（/s、ʃ、tʃ/）可懂度的大量变化，但对其他辅音（清塞音）则不然。这种差异很可能是由于两组辅音在以相似的辅音-噪声比呈现时，可听度存在差异。大多数数据表明，C-V比的重要性与辅音强度有关，但与辅音和元音水平之间的比例本身无关。
