中国人群的同时掩蔽测量及其特性分析

基于心理声学听音实验,进行了中国人群的听觉同时掩蔽阈值测量,其中掩蔽声为第4~22临界带带宽粉红噪声,掩蔽声压级60 dB和80 dB,被掩蔽声为频率在临界带频率范围内及其附近的纯音信号。在此基础上,对同时掩蔽特性进行了分析和讨论,并与相关文献的结论进行了比较。结果显示掩蔽曲线随着掩蔽声压级增大非对称性增强,上升沿与下降沿斜率差异增大。不同临界带的掩蔽曲线的平均峰值呈现无规分布,并不如前人模型所描述,从低频到高频单调衰减。掩蔽增长率在被掩蔽声频率较高时,普遍有一定的下降趋势,与前人测量结果有所差异。

Chinese simultaneous masking measurement and their characteristics analysis

Based on psychoacoustics detection,Chinese simultaneous masking thresholds were measured,where maskers were 4th to 22nd critical-bandwidth pink noises at the level of 60 dB and 80 dB,and maskees were pure tones whose frequencies were within and near the corresponding critical band.The characteristics of simultaneous masking were analyzed and discussed on the basis of the data,and were compared with the conclusions of related literatures.It was shown that the masking curves were more asymmetrical,and the difference between up and down slopes were larger as masker level increased.Average peaks of curves of different critical bands were distributed randomly,but did not decrease monotonously as previous model described.Suppression slopes generally decreased at high maskee frequency,which was remarkably different from previous measure results.