首页> 外文学位 >TEMPORAL SPECIFICITY: SIGNAL DETECTION AS A FUNCTION OF TEMPORAL POSITION (PSYCHOACOUSTICS, SIGNAL DETECTION).
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TEMPORAL SPECIFICITY: SIGNAL DETECTION AS A FUNCTION OF TEMPORAL POSITION (PSYCHOACOUSTICS, SIGNAL DETECTION).

机译:时间特异性:信号检测作为时间位置的一种功能(心理声学,信号检测)。

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摘要

The listener's response process is modeled as a temporal window through which the incoming stimulus waveform is viewed with the window positioned so as to maximize signal-to-noise ratio. To test this model, listeners were asked to detect a .5 ms pulse in a noise background during a 1500 ms observation interval. Using the probe-signal method (G. Z. Greenberg and W. D. Larkin, J. Acoust. Soc. Am., 44, 1513-1523, 1968) in a yes/no task; a primary signal which had a fixed temporal position was presented on 40%, a probe signal (variable temporal position) on 10%, and noise alone on 50% of the trials. Listeners' performance, which was measured as hit rate, was maximal at those positions near the primary. In separate experiments, this effect was shown to be independent of the position of the primary.; In companion experiments not utilizing the probe-signal method, it was determined that signals positioned at any point within the observation interval were equally detectable if presented in isolation. However, if a signal could occur with equal probability at any of seven positions (temporal uncertainty), then performance worsened. This decrease can be accounted for by a temporal window which changes from a narrow configuration yielding a large signal-to-noise ratio in the first instance to a broadened state producing a reduced signal-to-noise ratio in the second case.
机译:收听者的响应过程被建模为一个时间窗口,通过该时间窗口可以查看传入的刺激波形,并将该窗口放置在窗口中,以使信噪比最大化。为了测试该模型,要求听众在1500毫秒的观察间隔内在噪声背景中检测到0.5毫秒的脉冲。在是/否任务中使用探测信号方法(G. Z. Greenberg和W. D. Larkin,J. Acoust。Soc。Am。,44,1513-1523,1968);在试验中,具有固定时间位置的主要信号占40%,探测信号(可变时间位置)占10%,仅噪声占50%。聆听者的表现(以命中率衡量)在靠近小学的位置处达到最高。在单独的实验中,这种效应被证明与初级位置无关。在不使用探测信号方法的伴随实验中,确定了如果单独提供,则位于观察间隔内任意点的信号同样可以被检测到。但是,如果在七个位置中的任何一个位置都可能以相等的概率发生信号(时间不确定性),则性能会变差。这种减小可以由时间窗口来解释,该时间窗口从在第一情况下产生大的信噪比的狭窄配置变化到在第二情况下产生减小的信噪比的加宽状态。

著录项

  • 作者

    LEIS ROSSIO, BEVERLY.;

  • 作者单位

    The University of Iowa.;

  • 授予单位 The University of Iowa.;
  • 学科 Health Sciences Audiology.
  • 学位 Ph.D.
  • 年度 1986
  • 页码 161 p.
  • 总页数 161
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 耳科学、耳疾病;
  • 关键词

  • 入库时间 2022-08-17 11:51:06

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