基于方向正交小波基的声源定位

Sound Source Location Based on Directional Orthogonal Wavelet Basis Technology

引入一种光滑性可调的对信号的方向性敏感的周期基插值小波,先对其进行正交化处理,构成二维空间的方向正交小波基,同时对相应的滤波器周期化,给出了快速方向小波变换的算法。对于方向性弱的声音信号可以选择阶数相对高的周期基插值小波来分析,而对于方向性强的信号只要阶数低的周期基插值小波就可以。用传声器阵列对声音信号进行采集,对采集的数据进行快速方向正交小波变换,通过角度和半径方向的图,得到两条比较清晰的半径线,它们的交点唯一确定声源的位置。

In this paper, we employ the two-dimensional directional orthogonal wavelet to locate sound source. We construct the two-dimensional directional orthogonal wavelet through orthogonalizing periodic cardinal interpolatory wavelet which has adjustable-smoothness and is sensitive to the direction, and then perform fast directional wavelet transform. Higher order cardinal interpolatory wavelet is adapted for signal which is worse in directionality. Sound data collected with the use of a alculator is processed on the basis of the above wavelet transform. Sound location can be accurately determined by the intersection point of angle and radius line in diagram. Numerical experiment indicates that this method of sound source location is very efficient.