The danger of using narrow-band noise maskers to measure "suppression".
The danger of using narrow-band noise maskers to measure "suppression".
复制标题
使用窄带噪声掩蔽器来测量“抑制”的危险。
DOI：
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发表时间：
1985
影响因子：
2.4
通讯作者：
B. Glasberg
中科院分区：
文献类型：
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作者：
B. Moore;B. Glasberg
这些实验研究了知觉提示是否在窄带噪声掩蔽和简短信号的前向掩蔽中观察到的“去掩蔽”效应中起作用。在60 dB SPL水平下，测量了100 Hz宽的噪声掩蔽器产生的前向掩蔽，用于1 kHz正弦信号，该信号具有升余弦包络，在6 dB下降点处持续时间为10 ms，无论是单独的掩蔽器，还是添加到掩蔽器的各种组件（并与掩蔽器同步选通）。发现即使对于极不可能产生显著掩蔽抑制的组分也会发生解蔽：这些包括75-dB SPL 4-kHz正弦曲线、50-dB SPL 1.4-kHz正弦曲线、在4kHz处以0 dB的频谱电平进行低通滤波的噪声，以及在4kHz下低通滤波的噪声，其中在掩蔽加信号的对侧耳朵中呈现20 dB的频谱水平。它的结论是，知觉提示可以发挥重要的作用，在产生unmasking简短的信号以下窄带噪声掩蔽，这是不明智的解释unmasking仅在抑制方面。
These experiments investigated whether perceptual cueing plays a role in the "unmasking" effects which have been observed in forward masking for narrow-band noise maskers and brief signals. The forward masking produced by a 100-Hz-wide noise masker at a level of 60 dB SPL was measured for a 1-kHz sinusoidal signal with a raised-cosine envelope and a duration of 10 ms at the 6-dB-down points, both for the masker alone, and with various components added to the masker (and gated synchronously with the masker). Unmasking was found to occur even for components which were extremely unlikely to produce a significant suppression of the masker: these included a 75-dB SPL 4-kHz sinusoid, a 50-dB SPL 1.4-kHz sinusoid, a noise low-pass filtered at 4 kHz with a spectrum level of 0 dB, and a noise low-pass filtered at 4 kHz with a spectrum level of 20 dB presented in the opposite ear to the masker-plus-signal. It is concluded that perceptual cueing can play a significant role in producing unmasking for brief signals following narrow-band noise maskers, and that it is unwise to interpret the unmasking solely in terms of suppression.