Hillenbrand J
RIT Research Corporation, Rochester, New York.
J Acoust Soc Am. 1988 Jun;83(6):2361-71. doi: 10.1121/1.396367.
The purpose of this study was to investigate univariate relationships between perceived dysphonia and variation in pitch perturbation, amplitude perturbation, and additive noise. A time-domain, pitch-synchronous synthesis technique was used to generate sustained vowels varying in each of the three acoustic dimensions. A panel of trained listeners provided direct magnitude estimates of roughness in the case of the stimuli varying in pitch and amplitude perturbation, and breathiness in the case of the stimuli varying in additive noise. Very strong relationships were found between perceived roughness and either pitch or amplitude perturbation. However, unlike results reported previously for nonspeech stimuli, the subjective quality associated with pitch perturbation was quite different from that associated with amplitude perturbation. Results also showed that perceived roughness was affected not only by the amount of perturbation, but also by the degree of correlation between adjacent pitch or amplitude values. A strong relationship was found between perceived breathiness and signal-to-noise ratio. Contrary to previous findings, there was no interaction between signal-to-noise ratio and the amount of high-frequency energy in the periodic component of the stimulus: Stimuli with similar signal-to-noise ratios received similar ratings, regardless of differences in the spectral slope of the periodic component.
本研究的目的是调查感知到的发声障碍与音高扰动、幅度扰动和附加噪声变化之间的单变量关系。采用时域、音高同步合成技术生成在三个声学维度中每个维度都有所变化的持续元音。一组经过训练的听众对音高和幅度扰动变化的刺激提供粗糙度的直接量级估计，对附加噪声变化的刺激提供呼吸声的直接量级估计。研究发现，感知到的粗糙度与音高或幅度扰动之间存在非常强的关系。然而，与之前关于非语音刺激的报告结果不同，与音高扰动相关的主观质量与与幅度扰动相关的主观质量有很大差异。结果还表明，感知到的粗糙度不仅受扰动量的影响，还受相邻音高或幅度值之间的相关程度的影响。研究发现，感知到的呼吸声与信噪比之间存在很强的关系。与之前的研究结果相反，信噪比与刺激周期成分中的高频能量含量之间没有相互作用：具有相似信噪比的刺激获得相似的评分，无论周期成分的频谱斜率存在差异。
