Yost W A
Parmly Hearing Institute, Loyola University Chicago, Illinois 60626, USA.
J Acoust Soc Am. 1997 Mar;101(3):1644-8. doi: 10.1121/1.418148.
Two versions of a cascade of delay, gain following delay, and add circuits were used to generate iterated rippled noise (IRN) stimuli. IRN stimuli produce a repetition pitch whose pitch strength relative to the noise percept can be varied by changing the type of circuit, the attenuation, or the number of iterations in the circuit. The repetition pitch of IRN is different when the delayed noise is subtracted (gain < 0) rather than added (gain > 0) to the undelayed noise. In the case of subtraction, IRN pitch is often ambiguous having two or more pitches. Listeners were asked to use pitch strength to discriminate between various pairs of IRN stimuli generated with different gains, different network circuits, and different number of iterations. For most conditions the gain was less than one. The data were described by a description based on an exponential function of the largest peak of the autocorrelation function of IRN stimuli [W. A. Yost, J. Acoust. Soc. Am. 100, 511-518 (1996)] processed such that the spectral dominance region is emphasized. These results suggest that the strength of the pitch of IRN stimuli can be described by temporal processing mechanisms as might be revealed by autocorrelation.
使用了两种由延迟、延迟后的增益以及加法电路组成的级联电路来生成迭代波纹噪声（IRN）刺激。IRN刺激会产生一种重复音高，其相对于噪声感知的音高强度可以通过改变电路类型、衰减或电路中的迭代次数来改变。当从未延迟的噪声中减去延迟后的噪声（增益<0）而不是加上延迟后的噪声（增益>0）时，IRN的重复音高是不同的。在减法的情况下，IRN音高通常不明确，有两个或更多音高。要求听众使用音高强度来区分由不同增益、不同网络电路和不同迭代次数生成的各种IRN刺激对。在大多数情况下，增益小于1。这些数据通过基于对IRN刺激自相关函数最大峰值的指数函数的描述来描述[W. A. 约斯特，《美国声学学会杂志》100, 511 - 518 (1996)]，处理方式是强调频谱主导区域。这些结果表明，IRN刺激的音高强度可以通过自相关可能揭示的时间处理机制来描述。
