Listening bandwidths and frequency uncertainty in pure-tone signal detection.
Listening bandwidths and frequency uncertainty in pure-tone signal detection.
复制标题
纯音信号检测中的收听带宽和频率不确定性。
DOI：
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发表时间：
1991
影响因子：
2.4
通讯作者：
E. Hafter
中科院分区：
文献类型：
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作者：
R. Schlauch;E. Hafter
采用改进的探针信号法，研究了频率不确定度对噪声中音调信号检测的影响。检测过程中使用的收听频带宽度直接测量，允许将必须监测多个独立频带的影响与有限频率分辨率的影响分开进行分析。通过在每次试验开始时随机选择一个、两个或四个同时呈现的音调来改变不确定性。大多数实验都给出了一个预期信号，其频率与线索中的一个组成部分相匹配。然而，在剩下的试验中，信号是一个探针，这意味着它的频率与线索中的一个组成部分以恒定的比例不同。以正确率百分比衡量的探头性能下降，与期望值的比值越来越远。使用预期信号的个体心理测量函数将结果转换为分贝，并使用Patterson等人的四舍五入指数滤波器对收听频带进行拟合。Acoust。Soc。[j].科学通报，2002,(3)。所获得的带宽与使用陷波噪声掩蔽器的带宽相当，但是随着信号中元件数量的增加，带宽有一个小而一致的增加。主要结果是，考虑到探测器的限制，包括收听频带的宽度，不确定度的影响可以用1 of- m正交频带模型很好地描述。
The effect of frequency uncertainty on the detection of tonal signals in noise was studied using a modified probe-signal method. Widths of the listening bands used during detection were measured directly, allowing for an analysis that separates the effects of having to monitor multiple independent bands from those due to limited frequency resolution. Uncertainty was varied by beginning each trial with a cue consisting of one, two, or four randomly chosen, simultaneously presented tones. An expected signal, whose frequency matched one of the components in a cue, was presented on a majority of trials. However, on remaining trials, the signal was a probe, which meant that its frequency differed from one of the components in the cue by a constant ratio. Performance as measured in percent correct declined for probes at increasingly distant ratios from the expected values. The results were converted to dB using individual psychometric functions for expected signals and listening bands were fitted using the rounded exponential filter of Patterson et al. [J. Acoust. Soc. Am. 72, 1788-1803 (1982)]. The obtained bandwidths are comparable to those reported using notched-noise maskers, but there is a small but consistent increase in bandwidth with increased numbers of components in the cues. The primary results is that the effects due to uncertainty are well described by a 1-of-M orthogonal band model, which takes into consideration limitations of the detector, including the widths of the listening bands.