Yost William A
Speech and Hearing Science, Arizona State University, Tempe, AZ 85287-0102, USA.
J Acoust Soc Am. 2009 Sep;126(3):1336-41. doi: 10.1121/1.3192345.
Iterated rippled noise (IRN) was used to study discrimination of IRN stimuli with a lower number of iterations from IRN stimuli with a higher number of iterations as a function of stimulus duration (100-2000 ms). Such IRN stimuli differ in the strength of the repetition pitch. In some cases, the gain used to generate IRN stimuli was adjusted so that both IRN stimuli in the discrimination task had the same height of the first peak in the autocorrelation function or autocorrelogram. In previous work involving short-duration IRN stimuli (<500 ms), listeners were not able to discriminate between IRN stimuli that had different numbers of iterations but the same height of the first peak in the autocorrelation function. In the current study, IRN discrimination performance improved with increases in duration, even in cases when the height of the first peak in the autocorrelation was the same for the two IRN stimuli. Thus, future studies involving discrimination of IRN stimuli may need to use longer durations (1 s or greater) than those that have been used in the past.
迭代波纹噪声（IRN）被用于研究随着刺激持续时间（100 - 2000毫秒）的变化，较少迭代次数的IRN刺激与较多迭代次数的IRN刺激之间的辨别情况。此类IRN刺激在重复音高的强度上有所不同。在某些情况下，用于生成IRN刺激的增益会进行调整，以便辨别任务中的两种IRN刺激在自相关函数或自相关图中具有相同高度的第一个峰值。在先前涉及短持续时间IRN刺激（<500毫秒）的研究中，听众无法辨别具有不同迭代次数但自相关函数中第一个峰值高度相同的IRN刺激。在当前研究中，即使两种IRN刺激的自相关中第一个峰值高度相同，IRN辨别性能也会随着持续时间的增加而提高。因此，未来涉及IRN刺激辨别的研究可能需要使用比过去更长的持续时间（1秒或更长）。
