Monosyllabic word recognition at higher-than-normal speech and noise levels.
Monosyllabic word recognition at higher-than-normal speech and noise levels.
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DOI：
10.1121/1.426848
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发表时间：
1999-04
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影响因子：
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通讯作者：
G. Studebaker;R. L. Sherbecoe;D. M. McDaniel;Catherine A. Gwaltney
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文献类型：
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作者：
G. Studebaker;R. L. Sherbecoe;D. M. McDaniel;Catherine A. Gwaltney
研究了听力正常和轻度至中度感音神经性听力损失的成年人在单音节词识别中强度的影响。刺激是在安静和谈话者频谱匹配的噪声中呈现的带限NU#6单词列表。语音水平范围为64至99 dB SPL，信噪比范围为28至-4 dB。安静时，正常听力者在噪声中的表现基本上保持不变，在固定的S/N比下，它作为言语水平的线性函数而下降。当数据因听力损失的影响而得到纠正时，听力受损受试者的表现与在噪音中测试的正常听力受试者一样。结果表明：（1）噪声环境下的语音清晰度随噪声强度的增加而降低，当噪声强度超过69 dBSPL时，信噪比保持不变，语音清晰度降低，语音和噪声强度的影响是协同的，语音清晰度的降低可以用有效掩蔽强度的相对增加来模拟;（4）当考虑言语可听度的差异时，正常听力和听力受损受试者受到增加的信号水平的类似影响;（5）增加语音和噪音水平对语音识别的负面影响对所有成年受试者都是相似的，至少长达80岁;以及（6）语音的有效动态范围可能大于通常假定的值30 dB。
The effects of intensity on monosyllabic word recognition were studied in adults with normal hearing and mild-to-moderate sensorineural hearing loss. The stimuli were bandlimited NU#6 word lists presented in quiet and talker-spectrum-matched noise. Speech levels ranged from 64 to 99 dB SPL and S/N ratios from 28 to -4 dB. In quiet, the performance of normal-hearing subjects remained essentially constant in noise, at a fixed S/N ratio, it decreased as a linear function of speech level. Hearing-impaired subjects performed like normal-hearing subjects tested in noise when the data were corrected for the effects of audibility loss. From these and other results, it was concluded that: (1) speech intelligibility in noise decreases when speech levels exceed 69 dB SPL and the S/N ratio remains constant; (2) the effects of speech and noise level are synergistic; (3) the deterioration in intelligibility can be modeled as a relative increase in the effective masking level; (4) normal-hearing and hearing-impaired subjects are affected similarly by increased signal level when differences in speech audibility are considered; (5) the negative effects of increasing speech and noise levels on speech recognition are similar for all adult subjects, at least up to 80 years; and (6) the effective dynamic range of speech may be larger than the commonly assumed value of 30 dB.