COMPARISON OF AUDITORY FILTER SHAPES DERIVED WITH 3 DIFFERENT MASKERS
COMPARISON OF AUDITORY FILTER SHAPES DERIVED WITH 3 DIFFERENT MASKERS
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DOI：
10.1121/1.390487
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发表时间：
1984-01-01
影响因子：
2.4
通讯作者：
NIMMOSMITH, I
中科院分区：
文献类型：
--
作者：
GLASBERG, BR;MOORE, BCJ;NIMMOSMITH, I
通过测量1 khz正弦信号的阈值，为3种不同的主类型导出了听觉滤波器形状：具有可变宽度的频谱陷波的噪声；2音调，变频分离；以及具有可变纹波密度的正弦纹波谱的噪声。在每种情况下，掩模频谱与信号频率是对称的，信号电平是固定的，掩模电平是可变的，使用自适应的，2-alternative的，强制选择的程序来确定阈值。同时屏蔽和前向屏蔽都使用了。同时掩蔽的听觉滤波器形状比前向掩蔽的更宽。在同时掩蔽中，导出的滤波器与3种掩蔽器类型相似，尽管从波纹噪声数据导出的滤波器有比其他掩蔽器更宽的趋势。在前向掩蔽中，由3种掩蔽器类型的数据导出的听觉滤波器在带宽和滤波器裙边斜率上有很大差异，并且有一部分纹波噪声滤波器为负值。显然，抑制具有提高频率选择性的作用，这种作用在正向掩蔽中表现出来，而在同时掩蔽中则没有。增强的程度和性质因不同的掩膜类型而不同。
Auditory filter shapes were derived for 3 different master types, by measuring threshold [in humans] for a 1-kHz sinusoidal signal masked by: a noise with a spectral notch of variable width; 2 tones with variable frequency separation; and a noise with a sinusoidally rippled spectrum with variable ripple density. In each case the masker spectrum was symmetric about the signal frequency, the signal level was fixed and the masker level was varied to determine threshold using an adaptive, 2-alternative, forced-choice procedure. Both simultaneous and forward masking were used. The auditory filter shapes derived from the data were broader in simultaneous masking than in forward masking for all 3 masker types. In simultaneous masking the derived filters were similar for the 3 masker types, although there was a tendency for the filters derived from the rippled-noise data to be broader than those for the other maskers. In forward masking the auditory filters derived from the data for 3 masker types differed considerably in bandwidth and the slope of the filter skirts, and in that a portion of the rippled-noise filter was negative valued. Apparently, suppression has the effect of enhancing frequency selectivity, and this effect is revealed in forward but not in simultaneous masking. The degree and nature of the enhancement differs for different masker types.