UNCOMODULATED GLIMPSING IN CHECKERBOARD NOISE
UNCOMODULATED GLIMPSING IN CHECKERBOARD NOISE
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DOI：
10.1121/1.405811
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发表时间：
1993-05-01
影响因子：
2.4
通讯作者：
ROSEN, S
中科院分区：
文献类型：
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作者：
HOWARDJONES, PA;ROSEN, S
听众的能力，“瞥见”的声音线索在安静的部分中断的噪音主要是研究使用掩蔽与中断同时发生在整个频率范围内的掩蔽宽带调制中断。在这里，uncommodulated瞥见（瞥见的声音线索分离的时间和频率）的可能性进行了研究。为了实现这一点，语音接收阈值为一组intervocalic辅音自适应测量100赫兹至10千赫粉红噪声分为不同数量的频带的相等的能量。在非调制噪声条件下，奇数和偶数频带以10 Hz的速率交替打开和关闭。这种噪声的频谱图（在对数频率标度上）类似于棋盘的一部分。在“棋盘”噪声中，掩蔽物分为两个和四个频带，但不是八个或更多频带。进一步的研究表明，在两个波段的情况下，这种从掩蔽中的释放确实是由于未调制的瞥见，而不仅仅是由于在一个调制波段中的瞥见。在四波段的情况下，从棋盘噪声掩蔽的释放可以不依赖于uncommodulated瞥见。有趣的是，允许瞥见的条件导致了更大的受试者间变异性。这些结果的影响掩蔽波动的定量分析进行了讨论。
The ability of listeners to ''glimpse'' acoustic cues during the quieter sections of an interrupted noise has primarily been studied using maskers with interruptions occurring simultaneously across the entire frequency range of the masker-broadband comodulated interruptions. Here, the possibility of uncomodulated glimpsing (the glimpsing of acoustic cues separated both in time and frequency) was investigated. To achieve this, speech reception thresholds for a set of intervocalic consonants were adaptively measured in 100-Hz to 10-kHz pink noise divided into a varying number of frequency bands of equal energy. In uncomodulated noise conditions, the odd and even numbered bands were switched on and off alternately at a rate of 10 Hz. The spectrograms of such noises (on log frequency scales), resemble portions of a checkerboard. Glimpsing in ''checkerboard'' noise was found with maskers divided into two and four bands, but not into eight bands or more. Further investigations showed that, in the two-band case, this release from masking was indeed due to uncomodulated glimpsing, and not simply attributable to glimpsing in one of the modulated bands. In the four-band case, the release from masking in checkerboard noise can be accounted for without recourse to uncomodulated glimpsing. Interestingly, conditions which allowed glimpsing resulted in greater intersubject variability. The implications of these results for quantitative analyses of masker fluctuations are discussed.