基于空域相关滤波法的计算机视频线缆传导泄漏信号分析与重建

Analysis and reconstruction of conduction leakage signal of computer video cable based on the spatial correlation filtering method

针对计算机视频线缆(VGA接口线缆,DVI接口线缆)传导发射泄漏信号侦测与重建的问题,在小波变换的基础上提出了基于空域相关滤波的视频泄漏信号去噪方法.首先设计实验系统采集两种典型视频线缆的泄漏信号;然后对泄漏信号进行小波分解,并用空域相关法提取红信号;最后通过边缘检测实现原始视频信号的重建,分析了不同信噪比对信号重建率的影响.实验结果表明,空域相关滤波法能够有效抑制噪声,提高微弱泄漏信号的重建质量,在处理传导泄漏信号中具有重要应用价值.

Aiming at problems of the computer video cable （VGA, DVI） coupling leakage signal de- tection and reconstruction, the signal denoising method based on wavelet transform spatial correlation fil- tering is proposed. Firstly, the experiment system is designed to get the leakage signal of video cable. Then, the collected leakage signal is processed by wavelet transformation, the noise and red signal is sepa- rated through spatial correlation filtering. Finally, the original video signal through edge detection is re- constructed, and the influence of different signal-noise ratio on reconstruction rate is analyze. Experimen- tal results show that the spatial correlation filtering method can effectively suppress noise and improve the weak leakage signal reconstruction quality. The method has a great application value in the conduction leakage signal.