Some Acoustic Measures of the Fundamental Periodicity of Normal and Pathologic Larynges
Some Acoustic Measures of the Fundamental Periodicity of Normal and Pathologic Larynges
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正常和病理喉基本周期性的一些声学测量
DOI：
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发表时间：
1963
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通讯作者：
P. Lieberman
中科院分区：
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作者：
P. Lieberman
通过测量记录的声波波形的相邻基本周期的持续时间之间的差异来计算音高扰动。还使用喉镜拍摄声带的声音同步高速运动照片。结果发现，音高扰动反映了声门面积波的波形变化，以及声门周期性的变化。绝对值为0.5毫秒的扰动显然是由跨声门的气压降的瞬变引起的，而这又可能是由声道配置的变化引起的。具有较长基本周期的扬声器往往具有较大的扰动。本文对23例声带病变者的音高扰动进行了测量。某些声带有病理性生长的扬声器比具有相同中值基频周期的正常扬声器具有更大的音高扰动。“扰动因子”被定义为扰动超过0.5毫秒的百分比。
Pitch perturbations were computed by measuring the differences between the durations of adjacent fundamental periods from recorded acoustic waveforms. Sound‐synchronized high‐speed motion pictures of the vocal cords were also taken with a laryngeal mirror. It was found that pitch perturbations reflect variations in the waveshape of the glottal area wave, as well as variations in glottal periodicity. Perturbations having an absolute value ⩾0.5 msec are apparently induced by transients in the air‐pressure drop across the glottis, which may in turn be caused by changes in vocal‐tract configurations. Speakers with longer fundamental periods tend to have larger perturbations. The pitch perturbations of 23 speakers with pathologic larynges were measured. Certain of the speakers who had pathologic growths on their vocal cords had larger pitch perturbations than did normal speakers with the same median fundamental periods. The “perturbation factor,” which was defined as the percent that perturbations ⩾0.5 msec oc...