【摘要】 在模拟地震记录信号中加入信噪比为17的高斯白噪声,然后分别采用小波降噪和小波包降噪方法,对含噪信号进行降噪处理。在不同降噪阈值下,比较降噪后信号的信噪比。结果表明:在同一降噪阈值下,小波包降噪后信号的信噪比高于小波降噪后信号的信噪比,而且采用wbmpen方法给定的阈值明显可以提高降噪后信号的信噪比。更多还原

【Abstract】 We add white gaussian noise to analog seismic signal with signal-to-noise ratio of 17. Then, we reduce noise of the signal using the method based on wavelet transform and wavelet packet transform.And, we compare the value of signal-to-noise ratio after noise reduction by one method with that by the other under different threshold.Then, we obtain the result. The value of signal-to-noise ratio after noise reduction based on wavelet packet transform is higher than that based on wavelet transform.Furthermore, it is obviously raised that the value of signal-to-noise ration after noise reduction using the method of wbmpen.更多还原