Lexical tone recognition with spectrally mismatched envelopes.
Lexical tone recognition with spectrally mismatched envelopes.
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DOI：
10.1016/j.heares.2008.09.006
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发表时间：
2008-12
期刊：
影响因子：
2.8
通讯作者：
Xu L
中科院分区：
文献类型：
--
作者：
Zhou N;Xu L
频率-位置失配对英语语音识别的影响已被证明是有害的。本研究利用噪声激励声码器研究了包络谱分布失配对汉语声调识别的影响。在实验1中，语音样本进行处理，以模拟人工耳蜗植入不同的插入深度。在耳蜗中，载体带相对于分析带基底移位1至7 mm。九名听力正常的普通话听众参加了这项实验。基移的载体只有轻微的影响音调识别。声调识别对频谱偏移的抵抗力可以归因于与频谱操纵无关的整体幅度轮廓线索。实验2检查了频率压缩的影响，其中将加宽2、6和10 mm的分析频带压缩分配给较窄的载波频带。9名受试者中的5名参与了实验2。看来，扩展的频率信息，特别是在低频端，可以补偿的失真，从频率压缩。因此，频谱偏移可能不会对音调识别造成严重问题，并且分配更宽的频率范围以包括更多的低频信息可能有利于音调识别。
It has been shown that frequency-place mismatch has detrimental effects on English speech recognition. The present study investigated the effects of mismatched spectral distribution of envelopes on Mandarin Chinese tone recognition using a noise-excited vocoder. In Experiment 1, speech samples were processed to simulate a cochlear implant with various insertion depths. The carrier bands were shifted basally relative to the analysis bands by 1 to 7 mm in the cochlea. Nine normal-hearing Mandarin Chinese listeners participated in this experiment. Basal shift of the carriers only slightly affected tone recognition. The resistance of tone recognition to spectral shift can be attributed to the overall amplitude contour cues that are independent from spectral manipulations. Experiment 2 examined the effects of frequency compression, where widened analysis bands by 2, 6, and 10 mm were compressively allocated to narrower carrier bands. Five of the 9 subjects participated in Experiment 2. It appears that the expanded frequency information especially on the low frequency end can compensate for the distortion from frequency compression. Thus, spectral shift might not pose a severe problem for tone recognition, and allocation of wider frequency range to include more low frequency information might be beneficial for tone recognition.
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