A Threshold Denoising Method Based on Emd
نویسندگان
چکیده
The denoising method based on empirical mode decomposition (EMD) can be broadly divided into: IMF extraction method and IMF threshold approach. Aiming to the problems of how to select IMFs in extraction method and the processing of the selected IMFs, a threshold denoising method based on EMD is put forward. In this method, the standard of IMF selection in energy viewpoint is offered, and the IMFs upping to the standard are selected firstly, then, through comparing the average energy of all unselected IMFs with the energy of each selected IMF, the singular selected IMFs are confirmed, and denoised by threshold. Finally, the denoised signal is obtained by summing up all selected IMFs. The current method combines the soft threshold denoising method with the IMF selection together, compared with other denoising methods, the effectiveness and superiority of the method is validated. The result provides support for improving the denoising effect in engineering.
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