强噪声环境下高速列车内语言清晰度评价与分析

为了对高速列车车内强噪声环境下的语言清晰度进行定量分析,利用最新语言传输指数间接测量方法及其与汉语语言清晰度的关系,得到不同运行速度和语音声级下车内不同位置的语言清晰度.结果表明,受电弓下部车内位置语言清晰度状况最差;该位置的语言清晰度随速度呈线性规律变化,随语音声级呈二次非线性规律变化.采用多元非线性回归分析,建立以语音声级和列车运行速度为自变量的车内语言清晰度的关系式.试验测试结果与计算结果的标准差为1.75%,拟合优度为0.963,表明该关系式可以较好地模拟三者之间的相关关系.与基于语言清晰度指数的评价方法相比较,该评价方法所需的客观参量测量更简单,更具应用价值.

Evaluation and Analysis of Speech Intelligibility in High speed Train Compartments Under Strong Noise Environment

For the quantitative analysis of the speech articulation in high speed train compartment under strong noise environment, the speech articulation was achieved in different positions of high speed train compartments under different speeds and speech levels by using the relationship between Chinese speech articulation and the speech transmission index (STI) according to IEC 60268 16(2011). The results show that the interior location below the pantograph is the weakest position for speech articulation. In addition, at this position speech articulation changes with speed linearly rule and with speech level quadratic nonlinearly. Then, by using multivariate nonlinear regression analysis, the relational expression of interior speech articulation, speed and speech level was established. The standard deviation between the test results and the curve was 1.75% and the coefficient of determination R2 was 0.963, which indicates that the expression can well simulate the relationship among them. Compared with the evaluation method based on speech transmission index, the objective parameter of this evaluation method is simpler and this method has more application values.