Factors affecting masking release for speech in modulated noise for normal-hearing and hearing-impaired listeners
Factors affecting masking release for speech in modulated noise for normal-hearing and hearing-impaired listeners
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DOI：
10.1121/1.2266530
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发表时间：
2006-10-01
影响因子：
2.4
通讯作者：
Houtgast, Tammo
中科院分区：
文献类型：
--
作者：
George, Erwin L. J.;Festen, Joost M.;Houtgast, Tammo
研究了8名正常听力听者、29名感音神经性听障听者和16名模拟听力损失的正常听力听者在固定噪声和几种调幅噪声中对句子的言语接收阈值的测定。这种方法可以确定掩蔽调制的降低效益，正如在听力受损的听众中经常观察到的那样，是由于信号可听性的丧失，还是由于超阈值缺陷，如频谱和时间分辨率的降低，这是在四个独立的心理物理任务中测量的。结果表明，可听性降低只能部分解释掩蔽释放的减少，并且，在考虑阈值以上缺陷时，应考虑与提高呈现水平相关的正常效果。从这个角度来看，降低的光谱分辨率似乎不符合实际的超阈值赤字，而降低的时间分辨率则符合。时间分辨率和年龄是控制调制噪声中语音掩蔽释放的主要因素，占主体间方差的一半以上。它们的影响似乎主要与高刺激频率的处理有关。基于调制噪声下语音清晰度指数的计算结果证实了这些结论。(c) 2006年美国声学学会。
The Speech Reception Threshold for sentences in stationary noise and in several amplitude-modulated noises was measured for 8 normal-hearing listeners, 29 sensorineural hearing-impaired listeners, and 16 normal-hearing listeners with simulated hearing loss. This approach makes it possible to determine whether the reduced benefit from masker modulations, as often observed for hearing-impaired listeners, is due to a loss of signal audibility, or due to suprathreshold deficits, such as reduced spectral and temporal resolution, which were measured in four separate psychophysical tasks. Results show that the reduced masking release can only partly be accounted for by reduced audibility, and that, when considering suprathreshold deficits, the normal effects associated with a raised presentation level should be taken into account. In this perspective, reduced spectral resolution does not appear to qualify as an actual suprathreshold deficit, while reduced temporal resolution does. Temporal resolution and age are shown to be the main factors governing masking release for speech in modulated noise, accounting for more than half of the intersubject variance. Their influence appears to be related to the processing of mainly the higher stimulus frequencies. Results based on calculations of the Speech Intelligibility Index in modulated noise confirm these conclusions. (c) 2006 Acoustical Society of America.