双耳时间差上升沿算法中阈值的选择  

Criterion Selection in the Leading-edge Method for Evaluating Interaural Time Difference

作　　者：钟小丽[1] 

机构地区：[1]华南理工大学物理科学与技术学院声学研究所,广东广州510641

出　　处：《电声技术》2007年第9期47-52,共6页Audio Engineering

基　　金：国家自然科学基金(10374031)

摘　　要：上升沿法是计算双耳时间差的1种常用方法。采用3种不同对象的头相关脉冲响应数据,分别计算了不同判定阈值(5%,10%,15%,20%)下的双耳时间差,研究了上升沿算法中合理的判定阈值范围以及采用不同判定阈值时上升沿算法的稳定性。结果表明,判定阈值的选择与研究对象、头相关脉冲响应获取手段等因素有关;而稳定性主要取决于双耳头相关脉冲响应的上升斜率,复杂的、非对称的生理结构将使声源异侧耳的上升斜率减小,从而导致上升沿算法的不稳定,这在侧向表现得最明显;建议采用10%的判定阈值。Leading-edge method is commonly used in evaluating ITD（Interaural Time Difference）. The seleclion of rational criterion range and the stability of leading-edge method are investigated by applying leading-edge method to three different HRIR（Head-Related Impulse Response） data with four different criterions,namely 5%, 10%, 15%, and 20%. Results show that the rational criterion selection depends on research object, the way of obtaining HRIR, etc. And the stability of leading-edge method depends on the rising slope of binaural HRIRs. Decreased by the complicated and dissymmetrical anatomical structure, the rising slope of HRIR leads to instability of leading-edge nlethod, especially at lateral azinluths. Anlong the rational criteria, 10% criterion is reconlnlended. All the conclusions are helpful for understanding and applying leading-edge nlethod properly.

关 键 词：双耳时间差 头相关脉冲响应 上升沿算法 

分 类 号：TB52[理学—物理]