低频随机振动和正弦振动对汉语清晰度的影响

目的：探索随机振动和正弦振动因素下生成语音在听觉效果上的变化规律。方法：随机振动采用频率范围2-20Hz,加速度为0.3G、0.5G、0.7G(有效值，下同），正弦振动采用频率4、6、8、10、12Hz,加速度为0.3G、0.5G；在安静及信噪比分别为0dB和-6dB三种状态下对随机振动组、正弦振组及对照组3个组的语音材料进行清晰度测试。结果：和对照组相比，随机振动组，清晰度几科没有变化，正弦振动组，0.3G时4Hz、0.5G时6Hz和8Hz作用下语音清晰度有明显降低，检验结果非常显著。研究还发现，清晰度的降低随听音环境的信噪比的降低而变得严重；结论：正弦振动对发音人发音的影响，会使通话效果变差，并且在听音环境恶劣时尤为突出。

Effect of low frequencey random and sinusoidal vibrations on the intelligibility of Chinese syllables

Objective: Changes of auditory effect on Chinese single syllables uttered by talker under random vibration or sinusoidal vibrations were investigated. Method: Random vibrations with frequency range of 2 to 20Hz were applied to sitting talker, and their accelerations being 0.3G, 0.5G and 0.7G(rms). Sinusoidal vibrations at 4, 6, 8, 10, 12Hz were also applied, their accelerations being 0.3G and 0.5G(rms). The intelligibility tests were made under three conditions(quiet, 0dB and -6dB S/N ratio). The utterances were recorded under random vibrations, sinusoidal vibrations, and the control condition. Results: as compared with the control group, there are almost no difference in the random vibration group, but the decrease of speech illteligibilities in the sinusoidal group is significant, when the frequency is 4Hz at 0.3G acceleration and when the frequencies are 6Hz or 8Hz at 0.5G acceleration. Results show that sinusoidal effects play greater roles as S/N decreases in the listenning environment. Conclusion: speech production will be changed affected by sinusoidal vibration, and the changes will deteriorate communication, especially in adverse listenning environment.