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首页> 美国卫生研究院文献>The Journal of the Acoustical Society of America >Benefits of preserving stationary and time-varying formant structure in alternative representations of speech: Implications for cochlear implants
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Benefits of preserving stationary and time-varying formant structure in alternative representations of speech: Implications for cochlear implants

机译：在语音的替代表示中保留平稳和随时间变化的共振峰结构的好处：对人工耳蜗的影响

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Cochlear implants have improved speech recognition for deaf individuals, but further modifications are required before performance will match that of normal-hearing listeners. In this study, the hypotheses were tested that (1) implant processing would benefit from efforts to preserve the structure of the low-frequency formants and (2) time-varying aspects of that structure would be especially beneficial. Using noise-vocoded and sine-wave stimuli with normal-hearing listeners, two experiments examined placing boundaries between static spectral channels to optimize representation of the first two formants and preserving time-varying formant structure. Another hypothesis tested in this study was that children might benefit more than adults from strategies that preserve formant structure, especially time-varying structure. Sixty listeners provided data to each experiment: 20 adults and 20 children at each of 5 and 7 years old. Materials were consonant-vowel-consonant words, four-word syntactically correct, meaningless sentences, and five-word syntactically correct, meaningful sentences. Results showed that listeners of all ages benefited from having channel boundaries placed to optimize information about the first two formants, and benefited even more from having time-varying structure. Children showed greater gains than adults only for time-varying formant structure. Results suggest that efforts would be well spent trying to design processing strategies that preserve formant structure.
机译：耳蜗植入物可以改善聋人的语音识别能力，但是在性能与正常听力的听众相匹配之前，还需要进一步的改进。在这项研究中，检验了以下假设：（1）保留低频共振峰结构的努力将有益于植入物的加工，（2）该结构随时间变化的方面将特别有益。使用带有正常听众的声音编码和正弦波刺激，两个实验检查了在静态频谱通道之间放置边界以优化前两个共振峰的表示并保留时变共振峰的结构。这项研究中检验的另一个假设是，通过保持共振峰结构（尤其是时变结构）的策略，儿童可能比成年人受益更多。 60个听众为每个实验提供了数据：5岁和7岁的每个年龄段分别有20名成人和20名儿童。材料是辅音-元音辅音单词，句法正确的四个单词，无意义的句子和句法正确的五个单词，有意义的句子。结果表明，各个年龄段的收听者都受益于放置通道边界以优化有关前两个共振峰的信息，而受益于时变结构，则受益更大。仅在随时间变化的共振峰结构上，儿童表现出比成人更大的收益。结果表明，在设计能够保留共振峰结构的加工策略时将花费大量精力。

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