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采用一种新的阈值确定方法 :二次平方损失函数法 (QSLF法 ) ,通过对待分析信号进行小波变换 ,在小波变换域中 ,把小波系数进行阈值处理 ,即 :增强属于信号的小波系数 ,减弱或去除属于噪声的系数 .然后进行小波变换的逆变换 ,虽然会造成在小程度上丢失了一些细节 ,但只要考虑到抑制干扰噪声与所保留信号细节之间的权衡问题 ,仍能恢复出所期望的待分析信号 .计算机模拟实验结果表明 :该方法能有效的消除噪声
In this paper, a new method of threshold determination: QLSF (quadratic squared loss function) is proposed. Through the wavelet transform of the signal to be analyzed, the wavelet coefficients are thresholded in the wavelet transform domain, that is, the wavelet coefficients belonging to the signal are enhanced, Attenuate or remove coefficients that are noise, and then carry out the inverse transform of the wavelet transform, although some details are lost to a small extent, as long as the trade-off between suppression of the interference noise and the details of the retained signal is taken into account, The expected signal to be analyzed.Computer simulation results show that this method can effectively eliminate the noise