Features of stimulation affecting tonal-speech perception: Implications for cochlear prostheses
Features of stimulation affecting tonal-speech perception: Implications for cochlear prostheses
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DOI：
10.1121/1.1487843
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发表时间：
2002-07-01
影响因子：
2.4
通讯作者：
Pfingst, BE
中科院分区：
文献类型：
--
作者：
Xu, L;Tsai, YJ;Pfingst, BE
声调语言与英语的不同之处在于，单音节词的音高模式传达词汇意义。在本研究中，音调语音感知的刺激功能的依赖性进行了研究，使用声学模拟的人工耳蜗的CIS型语音处理策略。语音信号的频谱特征的贡献通过改变滤波器频带的数量来评估，而时间包络特征的贡献通过改变用于提取幅度包络的低通截止频率来评估。10名听力正常的中国普通话母语者进行了测试。当低通截止频率固定在512 Hz时，辅音、元音和句子识别作为通道数量的函数得到改善，并在4至6个通道时达到平台。随着通道数量增加到12个（测试的最高数量），对声音质量的主观判断继续改善。音调识别，即，四种普通话声调模式的识别，取决于通道的数量和低通截止频率。音调识别的时间和频谱线索之间的权衡表明，时间线索可以补偿音调识别的频谱线索减少，反之亦然。一个额外的音调识别实验，使用相同的持续时间的音节表现出显着下降，表明持续时间线索有助于孤独的识别。第三个实验表明，识别加工FM模式，模仿普通话的音调模式是穷人时，时间包络和持续时间线索被删除。(C)2002年美国声学学会。
Tone languages differ from English in that the pitch pattern of a single-syllable word conveys lexical meaning. In the present study, dependence of tonal-speech perception on features of the stimulation was examined using an acoustic simulation of a CIS-type speech-processing strategy for cochlear prostheses. Contributions of spectral features of the speech signals were assessed by varying the number of filter bands, while contributions of temporal envelope features were assessed by varying the low-pass cutoff frequency used for extracting the amplitude envelopes. Ten normal-hearing native Mandarin Chinese speakers were tested. When the low-pass cutoff frequency was fixed at 512 Hz, consonant, vowel, and sentence recognition improved as a function of the number of channels and reached plateau at 4 to 6 channels. Subjective judgments of sound quality continued to improve as the number of channels increased to 12, the highest number tested. Tone recognition, i.e., recognition of the four Mandarin tone patterns, depended on both the number of channels and the low-pass cutoff frequency. The trade-off between the temporal and spectral cues for tone recognition indicates that temporal cues can compensate for diminished spectral cues for tone recognition and vice versa. An additional tone recognition experiment using syllables of equal duration showed a marked decrease in performance, indicating that duration cues contribute to Lone recognition. A third experiment showed that recognition of processed FM patterns that mimic Mandarin tone patterns was poor when temporal envelope and duration cues were removed. (C) 2002 Acoustical Society of America.