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首页> 美国卫生研究院文献>The Journal of the Acoustical Society of America >Discrimination of interaural temporal disparities conveyed by high-frequency sinusoidally amplitude-modulated tones and high-frequency transposed tones: Effects of spectrally flanking noises
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Discrimination of interaural temporal disparities conveyed by high-frequency sinusoidally amplitude-modulated tones and high-frequency transposed tones: Effects of spectrally flanking noises

机译：高频正弦振幅调制音和高频转置音传达的耳间时间差异的辨别：频谱侧翼噪声的影响

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] reported that spectrally flanking noise increased threshold interaural temporal disparities (ITDs) conveyed by high-frequency transposed tones but rendered them indiscriminable when they were conveyed by high-frequency sinusoidally amplitude-modulated (SAM) tones. This study extends those observations and evaluates the role of “off-frequency listening.” Threshold ITDs were measured using 4-kHz-centered transposed or SAM tonal “targets.” In “baseline” conditions, targets were presented without spectrally flanking noise. Additionally, targets were presented along with continuous diotic broadband Gaussian noise spectrally “notched” between 3.6 and 4.4 kHz. In another condition, only the high-pass segment of the notched noise was continuously present. In the final condition, only the low-pass segment was continuously present. Results indicate that (1) relative to baseline, adding notched noise resulted in similar relative increases of threshold ITDs for both SAM and transposed targets; (2) the presence of the high-pass segment of the notched noise resulted in greater relative increases in threshold ITDs over those obtained in baseline conditions for SAM tones as compared to transposed tones; (3) comparisons among all of the data were consistent with the interpretation that both on-frequency and off-frequency processing of envelope-based ITDs can be disrupted by the presence of a notched noise.
机译：]报告说，频谱侧翼噪声增加了高频转置音调所传达的阈值听觉时间差异（ITD），但当它们被高频正弦振幅调制（SAM）音调所传达时却难以区分。这项研究扩展了这些观察结果，并评估了“低频监听”的作用。阈值ITD使用以4 kHz为中心的移调或SAM音调“目标”进行测量。在“基准”条件下，提出的目标没有频谱侧翼​​噪声。此外，还提出了目标以及在3.6至4.4 kHz之间频谱“陷波”的连续的离散宽带高斯噪声。在另一种情况下，仅连续存在陷波噪声的高通部分。在最终条件下，仅连续存在低通段。结果表明：（1）相对于基线，增加陷波噪声会导致SAM和转置目标的阈值ITD相对增加； （2）与移调音调相比，陷波噪声的高通部分的存在导致阈值ITD的相对增加幅度大于在基线条件下获得的SAM音调的阈值ITD。 （3）所有数据之间的比较与以下解释一致：基于包络的ITD的频率内和频率外处理都可能由于存在陷波噪声而中断。

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