实验研究了帧长对汉语音段反转言语可懂度的影响。实验结果表明,帧长在64 ms以下,汉语音段反转言语具有较高的可懂度;帧长在64～203 ms之间,可懂度随帧长的增加逐渐降低;帧长在203 ms以上,可懂度为0。在帧长8 ms时,汉语的声调失真导致可懂度下降。原始语音信号和音段反转言语的调制谱的分析表明,调制谱失真大小和可懂度密切相关。因此,用原始语音信号和音段反转言语的窄带包络间的归一化相关值可以衡量调制谱失真大小,基于语音的语言传输指数法计算的客观值和实验结果显著相关(r=0.876,p<0.01)。研究表明,语言可懂度与窄带包络有关,音段反转言语的可懂度和保留原始语音信号的窄带包络密切相关。 The effect of frame length on reversal speech intelligibility of Chinese speech segments was experimentally studied. Experimental results show that the frame length is under 64 ms and the Chinese speech segment has a high degree of intelligibility. The frame length is between 64 and 203 ms and the speech intelligibility gradually decreases with increasing frame length. ms or above, intelligibility is 0. At a frame length of 8 ms, the Chinese tonal distortion leads to a loss of intelligibility. Analysis of the modulation spectrum of the original speech signal and the pitch-reversed speech shows that the magnitude of the modulation spectrum distortion is closely related to the intelligibility. Therefore, the distortion of the modulation spectrum can be measured by the normalized correlation between the original speech signal and the narrowband envelope of the speech segment speech. The objective value calculated by speech-based speech transmission index method is significantly correlated with the experimental results (r = 0.876, p <0.01). The research shows that the speech intelligibility is related to the narrowband envelope, and the intelligibility of the speech segment inversion speech is closely related to the narrowband envelope preserving the original speech signal.