针对暂态信号的时频分布特点,提出了采用小波包的去噪新方法。首先采用小波包变换对暂态信号进行多尺度分解,搜索子频带范数随尺度变化而增大并达到峰值的子频带,然后对子频带内的小波系数进行阈值处理,最后进行信号重构。理论分析和实验结果表明本方法简单、有效。 Aiming at the characteristics of time-frequency distribution of transient signals, a new denoising method using wavelet packet is proposed. Firstly, the wavelet packet transform is used to decompose the transient signals in multi-scale to search the subbands whose subband norm increases with the scale changes and reaches the peak subband. Then, the wavelet coefficients in the subbands are thresholded, and finally the signals are reconstructed. Theoretical analysis and experimental results show that this method is simple and effective.