基于分频过零点探测的双耳声源定位  

Binaural Sound Localization Based on Detection of Multi-band Zero-crossing Points

作　　者：李从清[1,2] 武方[1] 孙立新[1] 戴士杰[1,3] 

机构地区：[1]河北工业大学机械工程学院,天津300130 [2]天津城市建设学院能源与机械工程系,天津300384 [3]哈尔滨工业大学机器人技术与系统国家重点实验室,哈尔滨150080

出　　处：《河北工业大学学报》2009年第6期1-5,共5页Journal of Hebei University of Technology

基　　金：河北省自然科学基金(F2007000118);机器人技术与系统国家重点实验室开放基金研究项目资助(SKLRS200716);河北省教育厅基金项目(2007315);国家自然科学基金青年基金项目(50804034);天津市大学科学技术发展基金计划项目(2007-1103)

摘　　要：提出一种基于分频过零点探测的双耳声源定位的方法.为了估计ITD,通常方法是利用左右耳瞬间神经发放率的互相关运算求得.可是,这些方法由于涉及互相关运算需要高运算复杂性.而且在噪声多源环境下容易遭受ITD估计的不准确性.在提出的方法中,估计ITD值是通过在采样ITD直方图上加权SNR获得,其SNR估计值是由ITD采样的偏差计算出.因此该方法能提供声源方向的准确估计和噪声鲁棒性.为了证明该方法的有效性,在各种噪声环境下进行了声源定位仿真实验,其结果证实了声源方向估计的准确性和噪声鲁棒性,并且与通常的互相关法相比能够提供显著少的计算复杂性.A method of binaural sound localization based on detection of multi-band zero-crossing points generated from binaural filter-band outputs is presented. To estimate ITD, conventional methods use cross-correlation of left and right in- stantaneous firing rates of neurons. However, these methods require high computational complexity involved in the com- putation of cross-correlation. Furthermore, they suffer from inaccuracies in estimating ITD in noisy multisouree environ- ments. In the suggested method, the ITD values are estimated by a histogram weighted by the estimated SNR computed from the variances of ITD samples. As a result, the method provides an accurate estimate of sound source direction and is more robust to noise. To verify the validity of the method, simulations for sound localization are performed under noise condition. The simulation results show that the method is able to provide an accurate estimate of sound source direction and is more robust to noise while offering significantly less computational complexity compared to the conventional cross- correlation based methods.

关 键 词：声源定位 分频带 过零点 

分 类 号：TB52[理学—物理] TN912[理学—声学]