Effects of spectral smearing and temporal fine structure degradation on speech masking release
Effects of spectral smearing and temporal fine structure degradation on speech masking release
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DOI：
10.1121/1.3126344
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发表时间：
2009-06-01
影响因子：
2.4
通讯作者：
Lorenzi, Christian
中科院分区：
文献类型：
--
作者：
Gnansia, Dan;Pean, Vincent;Lorenzi, Christian
本研究评估了频谱拖尾和时间精细结构（TFS）退化对掩蔽释放（MR）的影响（与正常听力听众观察到的稳定噪声相比，调幅语音识别的改善）。音节和噪声刺激使用频谱拖尾算法或音调激励声码器进行处理。这两种处理方案通过2和4的因子模拟听觉滤波器的加宽。听觉处理的早期阶段的模拟表明，这两种方案产生可比的激励模式，然而，TFS传达的基频（F0）信息的声码器比频谱涂抹算法退化更严重。这两种方案都减少了MR，但对于每个频谱拖尾量，声码器产生了更大的减少MR比频谱拖尾算法，符合每个方案对F0表示的影响。此外，频谱拖尾对两种方案产生的MR的影响在方式和浊音上是不同的。最后，中度听力损失的听众的MR数据匹配良好的MR数据获得正常听力的听众与声码刺激，这表明受损的频率选择性单独可能不足以占减少MR听力受损的听众。(C)2009年，美国声学学会。[DOI：10.1121/1.3126344]
This study assessed the effects of spectral smearing and temporal fine structure (TFS) degradation on masking release (MR) (the improvement in speech identification in amplitude-modulated compared to steady noise observed for normal-hearing listeners). Syllables and noise stimuli were processed using either a spectral-smearing algorithm or a tone-excited vocoder. The two processing schemes simulated broadening of the auditory filters by factors of 2 and 4. Simulations of the early stages of auditory processing showed that the two schemes produced comparable excitation patterns; however, fundamental frequency (F0) information conveyed by TFS was degraded more severely by the vocoder than by the spectral-smearing algorithm. Both schemes reduced MR but, for each amount of spectral smearing, the vocoder produced a greater reduction in MR than the spectral-smearing algorithm, consistent with the effects of each scheme on F0 representation. Moreover, the effects of spectral smearing on MR produced by the two schemes were different for manner and voicing. Finally, MR data for listeners with moderate hearing loss were well matched by MR data obtained for normal-hearing listeners with vocoded stimuli, suggesting that impaired frequency selectivity alone may not be sufficient to account for the reduced MR observed for hearing-impaired listeners. (C) 2009 Acoustical Society of America. [DOI: 10.1121/1.3126344]