Richards V M
Department of Psychology, University of Florida, Gainesville 32611.
J Acoust Soc Am. 1987 Nov;82(5):1621-30. doi: 10.1121/1.395153.
The ability to discriminate between simultaneously presented 100-Hz-wide bands of noise with envelopes that were either similar or dissimilar was measured. The center frequencies of the noise bands, fL and fL + delta f Hz, were systematically varied. When the bands of noise were separated by an octave, delta f = fL, discriminations were at chance levels. For frequency separations less than an octave, delta f less than fL, discrimination was best for fL = 2500 and 4000 Hz, somewhat poorer for fL = 1000 Hz, and impossible for fL = 350 Hz. Listeners were also asked to discriminate between bands of noise with envelopes that were either perfectly or partially correlated, and bands with envelopes that were either uncorrelated or partially correlated. The data suggest that, when transformed to an equal-variance scale (Fisher's z), equal changes in Fisher's z lead to equal changes in detectability, regardless of the correlation of the envelopes of the reference signal.
测量了区分同时呈现的具有相似或不同包络的100赫兹宽带噪声的能力。噪声带的中心频率fL和fL + δf赫兹被系统地改变。当噪声带相隔一个倍频程时，δf = fL，辨别处于随机水平。对于小于一个倍频程的频率间隔，δf < fL，对于fL = 2500和4000赫兹辨别最佳，对于fL = 1000赫兹稍差，对于fL = 350赫兹则无法辨别。还要求听众区分具有完全或部分相关包络的噪声带，以及具有不相关或部分相关包络的噪声带。数据表明，当转换到等方差尺度（费舍尔z）时，费舍尔z的相等变化导致可检测性的相等变化，而与参考信号包络的相关性无关。
