We have been investigating the effect of speech rate alteration on Japanese speech intelligibility, especially the differences by phonetic feature. We evaluated this difference in intelligibility using the Japanese Diagnostic Rhyme Test (DRT) on artificially speed-altered speech, such as time-expanded speech (1.6 times the original length, or 60% time expansion) and time-contracted speech (0.6 times the original length). Artificial speaking rate alteration was shown to have some effect or degradation on the Japanese speech intelligibility depending on the phonetic feature, initial consonant feature, and succeeding vowel context. Nasal and unvoiced plosives were relatively not affected by speed alteration. Syllables with vowel context /i/ showed 10% higher intelligibility when time-expanded. These results suggest guidelines for feature-dependent intelligible speed alteration methods.
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机译：我们一直在调查语音率改变对日语语音可懂度的影响，尤其是语音特征的差异。我们使用日本诊断押韵（DRT）对人工速度改变的语音（例如延长的语音（原始长度1.6倍或60％扩展）和时间收缩语音（0.6倍）进行这种差异原始长度）。根据语音特征，初始辅音功能和成功的元音上下文，显示人为说话率改变对日语语音智能性有一些效果或劣化。鼻腔和清音涂层相对不受速度变化的影响。音节与元音上下文/ i /在延长时显示了10％的可懂度。这些结果建议了特征依赖性可理解速度改变方法的指导。
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