一种相位编码的声源信号研究

Research and Implementation in Sound Signal Based on Phase Codes

在多声源声音定位系统当中,传统的声音发射信号在传播过程中容易受到风场、温度场、环境噪声等影响,加上声波自身的反射、衍射、散射特性,导致传声器接收到的声音信号极其微弱、不易识别,进而导致定位距离受到限制、定位精度受到影响。为了解决上述问题,从声音发射信号的要求入手进行理论分析,提出了一种相位编码的声音发射信号,经过Matlab仿真分析得出,与传统声音信号相比,相位编码信号使得传播过程信号衰减减小,经过匹配滤波接收后,辨识度增加。

The problem in the initiative sound location is that the transmitting procedure is affected by the wind field and temperature field easily, including the noise effect from the environment, the characteristic of sound, such as reflection refraction diffraction and the reflection characters from the goal＇ s surface, which lead to signal more weaker and increasing the difficulty of signal extraction. All those above affect location＇ s distance and precision, so focusing on the problem, through analysis the sounds signal characteristic and form, a solution to the corresponding is put forward, which is based on the phase codes. The results after simulation in Matlab show that the sound signals express less attenuation and the distinguish is more strong in the same conditions because of phase codes compared with general sound signals.