基于小波阈值的激光探测声音信号去噪研究

Research on Denoising Method of Laser Detection Sound Signal Based on Wavelet Threshold

激光声音探测技术是声音探测领域中重要的研究方向,但该探测技术极易受到背景光、大气湍流等引起的噪声干扰,对探测信号的噪声进行抑制是激光声音探测技术的关键.提出一种改进的阈值函数,通过调整参数可以改变小波系数估计值与原小波系数之间的偏差,同时尽量保存信号的特征信息.在实验室环境下通过实验验证了基于所提改进阈值函数的小波阈值去噪法的有效性,探测信号经去噪处理后噪声得到有效去除。

Laser sound detection technology is an important research direction in the field of voice detection, but this detection technology is vulnerable to noise interferences, which are mainly caused by background light and atmospheric turbulence. The noise suppression of detection signal is the key of laser sound detection technology. Therefore, an improved threshold function is proposed. By adjusting parameters, the deviation between the wavelet coefficients and the original wavelet coefficients can be changed, and the feature informa- tion of the original signals can be preserved as much as possible. In laboratory environment, the effectiveness of wavelet threshold denoising method based on the improved threshold function is verified by experiments. After denoising, the noise is effectively removed