Yost W A
Parmly Hearing Institute, Loyola University Chicago, Illinois 60626, USA.
J Acoust Soc Am. 1996 Jul;100(1):511-8. doi: 10.1121/1.415873.
Iterated rippled noise (IRN) stimuli are generated by a cascade of delay (d), gain (g), and add networks. The matched pitch of IRN stimuli was determined as a function of the type of network used to generate IRN stimuli, the delay (d = 2, 4, and 8 ms), the number of iterations (n = 1,2,3,4,6,8) of the delay and add networks, and whether the delayed noise was added (g = 1) to or subtracted (g = -1) from the undelayed noise. The matched pitch of IRN stimuli did not depend on the type of network. When g = 1 (addition), the matched pitch did not depend on the number of stages of iterations (n) and was always equal to the reciprocal of the delay (1/d). When g = -1 (subtraction), the match pitch depended on n. When n = 1, the matched pitch of IRN stimuli was ambiguous having two pitches in the region of 1/d +/- 10%. When n = 8, the match pitch was equal to 1/2d. This change in the pitch occurred between n = 2 and 6. The results are discussed in terms of spectral and temporal models of complex pitch processing. A temporal model based on autocorrelation was able to provide quantitative predictions for the pitch of these IRN stimuli. However, a spectral type of model can also account for the pitch of these IRN stimuli.
迭代波纹噪声（IRN）刺激是由延迟（d）、增益（g）和加法网络的级联产生的。IRN刺激的匹配音高是根据用于生成IRN刺激的网络类型、延迟（d = 2、4和8毫秒）、延迟和加法网络的迭代次数（n = 1、2、3、4、6、8）以及延迟噪声是加到（g = 1）还是从未延迟噪声中减去（g = -1）来确定的。IRN刺激的匹配音高不取决于网络类型。当g = 1（加法）时，匹配音高不取决于迭代阶段数（n），并且总是等于延迟的倒数（1/d）。当g = -1（减法）时，匹配音高取决于n。当n = 1时，IRN刺激的匹配音高不明确，在1/d +/- 10%的区域有两个音高。当n = 8时，匹配音高等于1/2d。这种音高变化发生在n = 2和6之间。根据复杂音高处理的频谱和时间模型对结果进行了讨论。基于自相关的时间模型能够为这些IRN刺激的音高提供定量预测。然而，频谱类型的模型也可以解释这些IRN刺激的音高。
