Enhancing Chinese tone recognition by manipulating amplitude envelope: Implications for cochlear implants
Enhancing Chinese tone recognition by manipulating amplitude envelope: Implications for cochlear implants
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DOI：
10.1121/1.1783352
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发表时间：
2004-12-01
影响因子：
2.4
通讯作者：
Fu, QJ
中科院分区：
文献类型：
--
作者：
Xin, L;Fu, QJ
声调识别对于普通话等声调语言的语音理解非常重要。人工耳蜗患者能够通过使用时间线索来感知一些音调信息，例如周期性相关的幅度波动以及基频 (F0) 轮廓和幅度包络之间的相似性。本研究调查修改幅度包络以更好地类似于 F0 轮廓是否可以进一步改善多通道人工耳蜗中的音调识别。对六名正常听力的中国人听四通道人工耳蜗语音处理器的模拟（有或没有幅度包络增强）时测量中文声调和元音识别。提出了两种算法来修改幅度包络以更接近 F0 轮廓。在第一个算法中，针对每个光谱通道调整幅度包络以及周期性波动的调制深度。在第二种算法中，在多通道语音处理之前调整整体幅度包络，从而减少语音频谱包络的任何局部失真。结果表明，两种算法都显着提高了汉语声调识别能力。通过在多通道处理之前调整整体幅度包络以匹配 F0 轮廓，可以更好地保留元音识别，并且需要更少的语音处理计算。结果表明，修改幅度包络使其更接近 F0 轮廓可能是改善中文人工耳蜗患者音调识别的有效方法。 (C) 2004 年美国声学学会。
Tone recognition is important for speech understanding in tonal languages such as Mandarin Chinese. Cochlear implant patients are able to perceive some tonal information by using temporal cues such as periodicity-related amplitude fluctuations and similarities between the fundamental frequency (F0) contour and the amplitude envelope. The present study investigates whether modifying the amplitude envelope to better resemble the F0 contour can further improve tone recognition in multichannel cochlear implants. Chinese tone and vowel recognition were measured for six native Chinese normal-hearing subjects listening to a simulation of a four-channel cochlear implant speech processor with and without amplitude envelope enhancement. Two algorithms were proposed to modify the amplitude envelope to more closely resemble the F0 contour. In the first algorithm, the amplitude envelope as well as the modulation depth of periodicity fluctuations was adjusted for each spectral channel. In the second algorithm, the overall amplitude envelope was adjusted before multichannel speech processing, thus reducing any local distortions to the speech spectral envelope. The results showed that both algorithms significantly improved Chinese tone recognition. By adjusting the overall amplitude envelope to match the F0 contour before multichannel processing, vowel recognition was better preserved and less speech-processing computation was required. The results suggest that modifying the amplitude envelope to more closely resemble the F0 contour may be a useful approach toward improving Chinese-speaking cochlear implant patients' tone recognition. (C) 2004 Acoustical Society of America.