Formant-frequency variation and informational masking of speech by extraneous formants: evidence against dynamic and speech-specific acoustical constraints.
Formant-frequency variation and informational masking of speech by extraneous formants: evidence against dynamic and speech-specific acoustical constraints.
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DOI：
10.1037/a0036629
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发表时间：
2014-08
期刊：
影响因子：
--
通讯作者：
Bailey PJ
中科院分区：
文献类型：
--
作者：
Roberts B;Summers RJ;Bailey PJ
言语是如何在感知上与其他言语分离的，人们仍然知之甚少。最近的研究表明，外部共振峰损害可懂度的能力取决于其频率轮廓的变化。本研究探讨了操纵这种变化的深度和模式的影响。三个共振峰（F1+F2+F3）构成自然句子的合成类似物分布在两只耳朵上，还有一个F2的竞争者（F2C），听众必须拒绝以优化识别（左= F1+F2C;右= F2+F3）。F1 − F3的频率等值线都被缩放到其自然深度的50%，对可懂度的影响很小。竞争者通过将F2的频率轮廓关于其几何平均值（类似于语音的模式）反转或使用与反转的F2C的平均速率和变化深度相匹配的规则和任意频率轮廓（三角波，不类似于语音）来创建。添加竞争者通常会降低清晰度;这种降低取决于F2C变化的深度，对于100%深度最大，对于50%深度居中，对于0%深度（恒定）F2C最小。这表明竞争者的影响取决于频率变化的整体深度，而不是相对于目标共振峰的深度。没有调谐（即，对于50%的情况，可懂度没有最小值）表明拒绝无关共振峰的能力不依赖于共振峰-频率变化的深度的相似性。此外，三角波的竞争对手是有效的，因为他们更像语音的同行，这表明从合奏共振峰的选择也不依赖于语音特定的限制。
How speech is separated perceptually from other speech remains poorly understood. Recent research indicates that the ability of an extraneous formant to impair intelligibility depends on the variation of its frequency contour. This study explored the effects of manipulating the depth and pattern of that variation. Three formants (F1+F2+F3) constituting synthetic analogues of natural sentences were distributed across the 2 ears, together with a competitor for F2 (F2C) that listeners must reject to optimize recognition (left = F1+F2C; right = F2+F3). The frequency contours of F1 − F3 were each scaled to 50% of their natural depth, with little effect on intelligibility. Competitors were created either by inverting the frequency contour of F2 about its geometric mean (a plausibly speech-like pattern) or using a regular and arbitrary frequency contour (triangle wave, not plausibly speech-like) matched to the average rate and depth of variation for the inverted F2C. Adding a competitor typically reduced intelligibility; this reduction depended on the depth of F2C variation, being greatest for 100%-depth, intermediate for 50%-depth, and least for 0%-depth (constant) F2Cs. This suggests that competitor impact depends on overall depth of frequency variation, not depth relative to that for the target formants. The absence of tuning (i.e., no minimum in intelligibility for the 50% case) suggests that the ability to reject an extraneous formant does not depend on similarity in the depth of formant-frequency variation. Furthermore, triangle-wave competitors were as effective as their more speech-like counterparts, suggesting that the selection of formants from the ensemble also does not depend on speech-specific constraints.
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影响因子：
2.4
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