| 基于小波变换与小波包变换的降噪方法比较 |
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| 引用本文： | 曾宪伟,赵卫明,许晓庆.基于小波变换与小波包变换的降噪方法比较[J].地震地磁观测与研究,2010,31(4):14-19. |
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| 作者姓名： | 曾宪伟 赵卫明 许晓庆 |
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| 作者单位： | 中国银川,750001,宁夏回族自治区地震局 |
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| 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。
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| 关 键 词： | 小波变换 小波包变换 地震子波 降噪 |
Comparison of noise reduction method based on wavelet transform and wavelet packet transform |
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| Zeng Xianwei,Zhao Weiming,Xu Xiaoqing.Comparison of noise reduction method based on wavelet transform and wavelet packet transform[J].Seismological and Geomagnetic Observation and Research,2010,31(4):14-19. |
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| Authors: | Zeng Xianwei Zhao Weiming Xu Xiaoqing |
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| Institution: | (Earthquake Administration of Ningxia Hui Autonomous Region, Yinchuan 750001, China) |
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| 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. |
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| Keywords: | wavelet transformation wavelet packet transform seismic wavelet noise reduction |
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