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在传统小波阈值降噪的基础上,提出了一种基于提升小波的改进阈值降噪方法,用于不同信噪比条件下实测压电传感器输出声信号的降噪,并与传统的硬、软阈值降噪方法进行对比。结果表明:该方法降低了硬、软阈值法降噪后信号的振荡,相比于硬阈值和软阈值降噪,信噪比SNR值最多可提高58.32%,降噪均方差MSE值最多可降低64.28%。最后通过Wigner-Ville时频分布进一步验证了该方法的有效性。
Based on the traditional wavelet threshold denoising, an improved threshold denoising method based on lifting wavelet is proposed to reduce the noise of the output acoustic signal of piezoelectric sensor under different signal-to-noise ratio. Compared with the traditional hard and soft Threshold noise reduction method for comparison. The results show that this method reduces the signal oscillation after the hard and soft threshold denoising. Compared with the hard threshold and soft threshold denoising, this method can improve the SNR value of signal-to-noise ratio by up to 58.32% and the MSE of noise reduction can reduce 64.28%. Finally, the validity of this method is further verified by Wigner-Ville time-frequency distribution.