Carlyon R P, Moore B C
J Acoust Soc Am. 1986 Feb;79(2):461-4. doi: 10.1121/1.393533.
Thresholds were measured for the detection of 20-ms sinusoids, with frequencies 500, 4000, or 6500 Hz, presented in bursts of bandpass noise of the same duration and centered around the signal frequency. A range of noise levels from 35 to 80 dB SPL was used. Noise at different center frequencies was equated in terms of the total noise power in an assumed auditory filter centered on the signal frequency. Thresholds were expressed as the signal levels, relative to these noise levels, necessary for subjects to achieve 71% correct. For 500-Hz signals, thresholds were about 5 dB regardless of noise level. For 6500-Hz signals, thresholds reached a maximum of 14 dB at intermediate noise levels of 55-65 dB SPL. For 4000-Hz signals, a maximum threshold of 10 dB was observed for noise levels of 45-55 dB SPL. When the bandpass noises were presented continuously, however, thresholds for 6500-Hz, 20-ms signals remained low (about 1 dB) and constant across level. These results are similar to those obtained for the intensity discrimination of brief tones in bandstop noise [R. P. Carlyon and B. C. J. Moore, J. Acoust. Soc. Am. 76, 1369-1376 (1984); R. P. Carlyon and B. C. J. Moore, J. Acoust. Soc. Am. 79, 453-460 (1986)].
测量了检测20毫秒正弦波的阈值，正弦波频率分别为500、4000或6500赫兹，以相同持续时间且以信号频率为中心的带通噪声脉冲形式呈现。使用了35至80分贝声压级的一系列噪声水平。不同中心频率的噪声在以信号频率为中心的假设听觉滤波器中的总噪声功率方面是相等的。阈值表示为相对于这些噪声水平，受试者达到71%正确率所需的信号水平。对于500赫兹的信号，无论噪声水平如何，阈值约为5分贝。对于6500赫兹的信号，在55 - 65分贝声压级的中间噪声水平下，阈值最高达到14分贝。对于4000赫兹的信号，在45 - 55分贝声压级的噪声水平下观察到最大阈值为10分贝。然而，当连续呈现带通噪声时，6500赫兹、20毫秒信号的阈值保持较低（约1分贝）且在不同水平上恒定。这些结果与在带阻噪声中对短音强度辨别所获得的结果相似[R. P. 卡利昂和B. C. J. 穆尔，《美国声学学会杂志》76, 1369 - 1376 (1984); R. P. 卡利昂和B. C. J. 穆尔，《美国声学学会杂志》79, 453 - 460 (1986)]。
