DETECTION THRESHOLDS FOR ISOLATED VOWELS
DETECTION THRESHOLDS FOR ISOLATED VOWELS
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DOI：
10.1121/1.1894642
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发表时间：
1991-02-01
影响因子：
2.4
通讯作者：
KEWLEYPORT, D
中科院分区：
文献类型：
--
作者：
KEWLEYPORT, D
本文完成了一系列孤立元音的可检测性实验。 刺激由三组十个元音组成：一个合成的，一个来自男性说话者，一个来自女性说话者。 元音持续时间范围为20-160毫秒的每组。 从训练有素的，听力正常的听众使用自适应跟踪范式获得了用于检测孤立的元音。 对于给定的持续时间，在耳机处为相等均方根声压校准的元音的检测阈值在30个元音之间相差22 dB。 此外，一个有序的降低元音阈值，获得了持续时间的增加，从以前的时间整合的数据预测。 几个不同的分析进行了尝试，以解释跨30个元音的差异检测能力。 分析占可听度降低阈值的变化显着，但元音阈值仍然超过15分贝。 元音光谱随后建模为激励模式，并检查了几个检测假设。 一个简单的平均值的激励水平在兴奋的临界带提供了最好的预测水平的变化需要保持阈值水平的响度在所有元音。
A series of experiments on the detectability of vowels in isolation has been completed. Stimuli consisted of three sets of ten vowels: one synthetic, one from a male talker, and one from a female talker. Vowel durations ranged from 20-160 ms for each of the sets. Thresholds for detecting the vowels in isolation were obtained from well-trained, normal-hearing listeners using an adaptive-tracking paradigm. For a given duration, detection thresholds for vowels calibrated for equal rms sound pressure at the earphones differed by 22 dB across the 30 vowels. In addition, an orderly decrease in vowel thresholds was obtained for increased duration, as predicted from previous data on temporal integration. Several different analyses were performed in an attempt to explain the differential detectability across the 30 vowels. Analyses accounting for audibility reduced threshold variability significantly, but vowel thresholds still ranged over 15 dB. Vowel spectra were subsequently modeled as excitation patterns, and several detection hypotheses were examined. A simple average of excitation levels across excited critical bands provided the best prediction of the level variations needed to maintain threshold-level loudness across all vowels.