Abstract: The sound can be accurately located by human auditory system in noisy environment. The main element to realize the location is interaural time difference. But the effects are unsatisfactory when using interaural time difference to locate in noisy environment. In order to resolve this problem, this thesis put forward a sound source locating system based on cochlear nucleus model, and cochlear nucleus model simulated the process of how cochlear deals with auditory information. The process could draw the synchronization information and firing rate from the reaction of auditory nerve fibers to sound, thus realizing the inhibitory of noise, and locating the sound source in noisy environment. The location error of system in noisy environment was 1.297 degrees. The experimental results show that the improved sound locating system can complete locating in noisy environment.

Key words: interaural time difference, neural firing, phase locking, cochlear nucleus model, sound localization

摘要： 人耳听觉系统在噪声环境中能够准确定位感兴趣的声源，实现其定位的主要因素是双耳时间差，但是在噪声环境下利用双耳时间差方法进行定位的效果比较差。针对这一问题，提出一个基于耳蜗核模型的声源定位系统。利用耳蜗核模型模拟耳蜗核对听觉信息的处理机制，提取听觉神经纤维中对语声刺激同步的信息和发放率信息，从而实现对噪声的抑制，完成噪声环境下的声源定位。该系统在噪声环境下定位的误差为1.297°。实验结果证明改进之后的声源定位系统能在噪声环境下进行声源定位。

关键词: 双耳时间差, 神经发放, 锁相, 耳蜗核模型, 声源定位