AUDITORY-FILTER CHARACTERISTICS DERIVED FROM DIRECT-MASKING DATA AND PULSATION-THRESHOLD DATA WITH A RIPPLED-NOISE MASKER
AUDITORY-FILTER CHARACTERISTICS DERIVED FROM DIRECT-MASKING DATA AND PULSATION-THRESHOLD DATA WITH A RIPPLED-NOISE MASKER
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DOI：
10.1121/1.381541
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发表时间：
1977-01-01
影响因子：
2.4
通讯作者：
HOUTGAST, T
中科院分区：
文献类型：
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作者：
HOUTGAST, T
掩模是波纹噪声，其功率谱（线性频率尺度上的强度）根据正弦函数形状。测试信号是纯音。波纹噪声的掩蔽效果[在人类受试者中]取决于其波峰和波谷相对于测试音调频率的位置，但对于高波纹密度（因此，对于沿频率尺度的峰对峰距离较小的波纹），这种依赖性降低了。掩蔽实验的结果作为测试音调频率周围纹波的位置和密度的函数，可以根据滤波器特性估计听觉频率分辨率的程度。采用了直接掩蔽、前向掩蔽和脉冲阈值三种信号生成范式。从脉冲阈值数据和前向掩蔽数据估计的频率分辨率明显高于直接掩蔽数据估计的频率分辨率。当用听觉滤波器带宽表示时，差异大约是2倍。这种差异被解释为通过横向抑制来反映光谱锐化，这显然仅在掩模和测试音调非同时呈现的阈值测量中表现出来。
The masker was rippled noise, with a power spectrum (intensity on a linear frequency scale) shaped according to a sinusoidal function. The test signal was a pure tone. The masking effectiveness of the rippled noise [in human subjects] depended on the position of its peaks and troughs relative to the test-tone frequency, but this dependence decreased for high-ripple densities (thus, for ripples with small peak-to-peak distances along the frequency scale). The results of masking experiments as a function of the position and density of the ripple around the test-tone frequency allowed an estimation of the degree of auditory frequency resolution in terms of a filter characteristic. Several maksing paradigms were applied: direct masking, forward masking and pulsation threshold. The degree of frequency resolution estimated from pulsation-threshold data and forward-masking data was substantially higher than that estimated from direct-masking data. The difference was about a factor of 2 when expressed in terms of the auditory filter bandwidth. This difference was interpreted as reflecting spectral sharpening by lateral suppression, which apparently manifests itself only in threshold measurements where masker and test tone are presented non-simultaneously.