Speech perception adjusts to stable spectrotemporal properties of the listening environment.
Speech perception adjusts to stable spectrotemporal properties of the listening environment.
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DOI：
10.1016/j.heares.2016.08.004
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发表时间：
2016-11
期刊：
影响因子：
2.8
通讯作者：
Zahorik, Pavel
中科院分区：
文献类型：
--
作者：
Stilp, Christian E.;Anderson, Paul W.;Assgari, Ashley A.;Ellis, Gregory M.;Zahorik, Pavel
当感知语音时，收听者补偿语音信号中的混响和稳定的频谱峰值。尽管自然的听音条件通常会增加混响和光谱着色，但这些过程只被单独研究过。混响在时间上模糊了频谱峰值，预计这会增加听众对这些峰值的补偿。使用有或没有模拟混响声场的句子来测试这种预测。在测试元音之前，所有句子都有一个稳定的频谱峰（通过放大与目标元音中的第二共振峰频率[F2]匹配的频率来添加），在F2和频谱包络（倾斜）中从/i/变化到/u/。在实验1中，听众表现出增加的补偿（较大的F2权重的减少和较大的增加，用于识别目标元音的频谱倾斜权重）在混响语音比在nonreverberant语音。在实验2中，补偿的增加被证明不是由于混响尾部造成的。在实验3中，在目标元音的F2频率处向非混响语音添加纯音增加了补偿，揭示了这些效果并不特定于混响。结果表明，感知调整稳定的频谱峰值在听的环境是不受其来源或原因。
When perceiving speech, listeners compensate for reverberation and stable spectral peaks in the speech signal. Despite natural listening conditions usually adding both reverberation and spectral coloration, these processes have only been studied separately. Reverberation smears spectral peaks across time, which is predicted to increase listeners’ compensation for these peaks. This prediction was tested using sentences presented with or without a simulated reverberant sound field. All sentences had a stable spectral peak (added by amplifying frequencies matching the second formant frequency [F2] in the target vowel) before a test vowel varying from /i/ to /u/ in F2 and spectral envelope (tilt). In Experiment 1, listeners demonstrated increased compensation (larger decrease in F2 weights and larger increase in spectral tilt weights for identifying the target vowel) in reverberant speech than in nonreverberant speech. In Experiment 2, increased compensation was shown not to be due to reverberation tails. In Experiment 3, adding a pure tone to nonreverberant speech at the target vowel’s F2 frequency increased compensation, revealing that these effects are not specific to reverberation. Results suggest that perceptual adjustment to stable spectral peaks in the listening environment is not affected by their source or cause.
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