Assmann P F, Nearey T M
J Acoust Soc Am. 1987 Feb;81(2):520-34. doi: 10.1121/1.394918.
Vowel matching and identification experiments were carried out to investigate the perceptual contribution of harmonics in the first formant region of synthetic front vowels. In the first experiment, listeners selected the best phonetic match from an F1 continuum, for reference stimuli in which a band of two to five adjacent harmonics of equal intensity replaced the F1 peak; F1 values of best matches were near the frequency of the highest frequency harmonic in the band. Attenuation of the highest harmonic in the band resulted in lower F1 matches. Attenuation of the lowest harmonic had no significant effects, except in the case of a 2-harmonic band, where higher F1 matches were selected. A second experiment investigated the shifts in matched F1 resulting from an intensity increment to either one of a pair of harmonics in the F1 region. These shifts were relatively invariant over different harmonic frequencies and proportional to the fundamental frequency. A third experiment used a vowel identification task to determine phoneme boundaries on an F1 continuum. These boundaries were not substantially altered when the stimuli comprised only the two most prominent harmonics in the F1 region, or these plus either the higher or lower frequency subset of the remaining F1 harmonics. The results are consistent with an estimation procedure for the F1 peak which assigns greatest weight to the two most prominent harmonics in the first formant region.
进行了元音匹配和识别实验，以研究合成前元音第一共振峰区域中谐波的感知贡献。在第一个实验中，听众从F1连续体中选择最佳语音匹配，作为参考刺激，其中两到五个相邻且强度相等的谐波带取代了F1峰值；最佳匹配的F1值接近该带中最高频率谐波的频率。该带中最高谐波的衰减导致F1匹配值降低。最低谐波的衰减没有显著影响，但在双谐波带的情况下除外，此时会选择更高的F1匹配值。第二个实验研究了F1区域中一对谐波之一强度增加导致的匹配F1的变化。这些变化在不同谐波频率上相对不变，并且与基频成正比。第三个实验使用元音识别任务来确定F1连续体上的音素边界。当刺激仅包括F1区域中两个最突出的谐波，或这些谐波加上其余F1谐波的高频或低频子集时，这些边界没有实质性改变。结果与F1峰值的估计程序一致，该程序赋予第一共振峰区域中两个最突出的谐波最大权重。
