The danger of using narrow‐band noise maskers to measure ‘‘suppression’’
作者:
Brian C. J. Moore,
Brian R. Glasberg,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1985)
卷期:
Volume 77,
issue 6
页码: 2137-2141
ISSN:0001-4966
年代: 1985
DOI:10.1121/1.391738
出版商: Acoustical Society of America
数据来源: AIP
摘要:
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 supression 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.
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