Determinants of the irrelevant speech effect: Changes in spectrum and envelope.
Determinants of the irrelevant speech effect: Changes in spectrum and envelope.
复制标题
不相关语音效果的决定因素：频谱和包络的变化。
DOI：
10.1121/1.5111749
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
W. Ellermeier
中科院分区：
文献类型：
--
作者：
Josef Schlittenlacher;Katharina Staab;Özlem Çelebi;A. Samel;W. Ellermeier
不相关的声音效果（伊势）表示短期记忆在暴露于声音时被破坏的事实。伊势是最大的演讲。本研究调查了导致伊势的潜在声学特性。刺激只包含频谱内容的变化，只包含包络的变化，或两者都包含。为此，进行了两个实验，并开发了两种声码策略，以降低语音的频谱内容和包络独立。第一种策略采用基于感知维度的噪声声码器，将原始话语分析为1、2、4、8或24个通道（临界频带）并独立地操纵响度。第二种策略涉及信号的时间分割，冻结频谱或电平持续时间范围从50 ms到14 s。在这两个实验中，单独的包络变化对性能没有可测量的影响，但是当光谱内容和包络变化时，伊势显著增加。此外，当包络变化与频谱变化不相关时，效果大小与恒定响度包络相同。这表明伊势主要是由光谱变化引起的，但同时发生的水平变化往往会放大它。
The irrelevant sound effect (ISE) denotes the fact that short-term memory is disrupted while being exposed to sound. The ISE is largest for speech. The presented study investigated the underlying acoustic properties that cause the ISE. Stimuli contained changes in either the spectral content only, the envelope only, or both. For this purpose two experiments were conducted and two vocoding strategies were developed to degrade the spectral content of speech and the envelope independently. The first strategy employed a noise vocoder that was based on perceptual dimensions, analyzing the original utterance into 1, 2, 4, 8, or 24 channels (critical bands) and independently manipulating loudness. The second strategy involved a temporal segmentation of the signal, freezing either spectrum or level for durations ranging from 50 ms to 14 s. In both experiments, changes in envelope alone did not have measurable effects on performance, but the ISE was significantly increased when both the spectral content and the envelope varied. Furthermore, when the envelope changes were uncorrelated with the spectral changes, the effect size was the same as with a constant-loudness envelope. This suggests that the ISE is primarily caused by spectral changes, but concurrent changes in level tend to amplify it.
影响因子：
1.6
作者：
Hughes, Robert W.
通讯作者：
Hughes, Robert W.