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首页> 外文期刊>The Journal of the Acoustical Society of America >Detection and discrimination of frequency glides as a function of direction, duration, frequency span, and center frequency
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Detection and discrimination of frequency glides as a function of direction, duration, frequency span, and center frequency

机译：根据方向，持续时间，频率跨度和中心频率来检测和区分频率滑动

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摘要

The study investigated the ability to detect and discriminate frequency glides under a variety of experimental conditions. The subjects distinguished between a comparison signal that either was level in frequency or was swept across a fixed frequency span, and a target signal that changed more in frequency than the comparison signal. Tone durations were 50 and 400 ms. Nominal center frequencies were 0.5, 2, and 6 kHz; actual center frequencies were varied randomly, or roved, over a range equal to 0.1 times the nominal center frequency. Up- and down-glides were used. The transition span of the comparison signal was either 0, 0.5, 1, or 2 times the equivalent rectangular bandwidth of the auditory filter at the nominal center frequency. Discrimination thresholds were obtained for all combinations of center frequency, direction, and span. Overall, thresholds expressed as Hz/ERB varied little as a function of center frequency. Glide duration had no effect on discrimination. The 50-ms down-glides were more difficult to detect than the 50-ms up-glides; otherwise, the effect of direction was not significant. With the exception of the 50-ms down-glides, detection/discrimination thresholds were similar for the 0-, 0.5-, and 1-ERB transition spans, but increased significantly for the 2-ERB span. The absence of significant variation across frequency supports a place mechanism for the detection of frequency change in gliding tones, based on the detection of changes in the excitation pattern. An excitation pattern model cannot account for the asymmetry noted for glide detection, however.
机译：这项研究调查了在各种实验条件下检测和区分频率滑动的能力。受试者区分了频率相等或扫过固定频率跨度的比较信号和频率比比较信号变化更大的目标信号。音调持续时间为50和400毫秒。标称中心频率为0.5、2和6 kHz;实际中心频率在等于或等于标称中心频率的0.1倍的范围内随机变化或波动。使用上下滑行。比较信号的过渡跨度是标称中心频率下听觉滤波器等效矩形带宽的0、0.5、1或2倍。获得中心频率，方向和跨度的所有组合的鉴别阈值。总体而言，以Hz / ERB表示的阈值随中心频率的变化很小。滑行时间对歧视没有影响。 50毫秒的向下滑行比50毫秒的向上滑行更难检测。否则，方向的影响不明显。除了50毫秒的向下滑行，对于0-，0.5-和1-E​​RB过渡跨度，检测/辨别阈值相似，但对于2-ERB跨度则显着增加。在整个频率上没有明显的变化支持了一种基于检测激励模式变化的位置机制，用于检测滑音中的频率变化。但是，激励模式模型不能解决滑行检测中提到的不对称性。

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