Detecting temporal onset and offset asynchrony in multicomponent complexes.
Detecting temporal onset and offset asynchrony in multicomponent complexes.
复制标题
检测多组分复合体中的时间起始和偏移异步。
DOI：
--
复制
发表时间：
1993
影响因子：
2.4
通讯作者：
D. Green
中科院分区：
文献类型：
--
作者：
J. Zera;D. Green
的能力，听众检测到的多成分复合物中的成分的时间的开始或偏移。监听器区分一个标准的复合体，其中所有的组件都是同步的，从一个异步复合体。在最初的实验中，通过在从高斯分布中提取的时间开始（起始实验）或结束（偏移实验）谐波来创建谐波。在后来的实验中，通过在复合体中的其他组件之前或之后仅启动或终止某些组件来创建复合体。一个复杂的由20个谐波分量与200赫兹的基本。另一种多组分复合物使用以对数频率（200至4000 Hz）等间隔隔开的组分。研究的参数是上升或衰减时间的组件，一个复杂的持续时间，和位移组件的频率位置。获得的阈值是不同的起始和偏移量。对于谐波复合波中的起始波，阈值是上升时间的非单调函数，对于1 ms的上升时间获得的最小值为0.2 ms。阈值通常随着衰减时间的增加而单调，范围从0.45-具有短得多的信号持续时间的实验表明，前向和后向掩蔽在所观察到的信号持续时间的差异中起的作用很小。阈值。作为异步分量的频率区域的函数测量的谐波刺激的起始阈值在约2000 Hz处显示出0.2 ms的最小值。抵消的阈值大约大十倍。对于对数复合物，在某些条件下，阈值大了近两个数量级。实验中，听众辨别的变化，无论是在开始或偏移的宽带刺激包络表明，检测时间的时间依赖于频率通道之间的比较，而不是在时间的开始或偏移的声音的整体能量的差异。
The ability of listeners to detect asynchrony in either the temporal onset or offset of components in multicomponent complexes was measured. The listener discriminated a standard complex, one in which all components were synchronous, from an asynchronous complex. In the initial experiments, asynchrony was created by starting (onset experiments) or ending (offset experiments) the harmonics at times drawn from a Gaussian distribution. In later experiments, asynchrony was created by starting or terminating only certain components before or after the other components in the complex. One complex consisted of 20 harmonic components with a fundamental of 200 Hz. Another multicomponent complex used components spaced at equal intervals in logarithmic frequency (200 to 4000 Hz). The parameters investigated were rise or decay time of components, duration of a complex, and frequency position of displaced components. The obtained thresholds were different for onset and offset asynchrony. For onset asynchrony in harmonic complexes, the thresholds were a nonmonotonic function of rise time with a minimum of 0.2 ms obtained for a rise time of 1 ms. For offset asynchrony, thresholds were generally monotonic with increases in decay time and ranged from 0.45-1.3 ms. Experiments with a much shorter signal duration demonstrated that forward and backward masking played little role in the observed differences in thresholds. Onset thresholds for harmonic stimuli measured as a function of the frequency region of the asynchronous component(s) showed a minimum of 0.2 ms at about 2000 Hz. The thresholds for offset were about ten times larger. For logarithmic complexes, in some conditions, thresholds were larger by nearly two orders of magnitude. Experiments in which the listeners discriminated changes either in the onset or offset envelope of the wideband stimulus suggest that detection of temporal asynchrony depends on comparison between frequency channels rather than on differences in the temporal onset or offset of the overall energy of the sounds.