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单耳通信时,周边噪声对语言可懂度产生影响。针对信号侧语音信号强度70 dB时,研究3种不同类型噪声下,干扰侧不同强度噪声和信号侧不同信噪比情况的语言可懂度。实验结果表明:当信号侧信噪比大于某一阈值时,干扰侧噪声对可懂度不产生显著影响,该阙值同噪声类型有关;而在信号侧低信噪比的情形下,干扰侧适当强度噪声可提高信号侧语言可懂度,最佳干扰噪声级为78~82 dB,过大的干扰侧噪声级导致可懂度下降。基于心理声学和生理学的初步机理发现:噪声环境下的语音识别中,对侧耳中耳肌肉伸缩对噪声感知的抑制提高了信号侧语言可懂度。
In single-ear communication, ambient noise has an impact on the speech intelligibility. When the speech signal intensity of signal side is 70 dB, the speech intelligibility of different intensity noise on interference side and different signal-to-noise ratio on signal side under three different types of noise is studied. The experimental results show that when the signal-to-noise ratio of the signal side is greater than a certain threshold, the interference side noise has no significant effect on the intelligibility, which is related to the type of noise. In the case of low signal-to-noise ratio at the signal side, Appropriate intensity noise can improve the signal-side speech intelligibility, the best interference noise level is 78 ~ 82 dB, and the excessive interference side noise level leads to a decrease in the intelligibility. Based on the preliminary mechanism of psychoacoustics and physiology, it is found that in speech recognition under noisy environments, the suppression of noise perception by contralateral middle ear muscles increases the speech intelligibility.