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arXiv 2209.09512eess.ASeess.SP
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基于经验模态分解和人工神经网络的肺音信号降噪组合模型

A Combined Model for Noise Reduction of Lung Sound Signals Based on Empirical Mode Decomposition and Artificial Neural Network

Mozhde Firoozi Pouyani, Mansour Vali, Mohammad Amin Ghasemi

摘要:

近年来,已经提出了肺音(LS)信号的计算机分析作为分析肺部状态的工具,但是一直存在主要挑战,包括LS被来自不同强度的不同来源的环境噪声污染。LS信号降噪的常用方法之一是基于信号的离散小波变换(DWT)系数或经验模式分解(EMD)的阈值化,然而,在这些方法中,需要计算信噪比值以确定合适的阈值来去除噪声。针对这一问题,本文提出了一种基于经验模态分解(EMD)和人工神经网络(ANN)的组合模型。该模型能够在不需要阈值处理甚至不需要信噪比估计的情况下,滤除-2 ~20dB范围内的白噪声和粉红噪声,同时较好地保留了LS信号的主要成分。将该方法与经验模态分解自定义方法进行了比较,从信噪比、拟合准则等方面表明了该方法的绝对优越性。例如,在SNR = 0 dB时,对于白噪声和粉红噪声,组合方法可以分别提高SNR 9.41和8.23dB,而对于EMD-自定义方法,相应的值分别为5.89和4.31dB。

英文摘要:

Computer analysis of Lung Sound (LS) signals has been proposed in recent years as a tool to analyze the lungs' status but there have always been main challenges, including the contamination of LS with environmental noises, which come from different sources of unlike intensities. One of the common methods in noise reduction of LS signals is based on thresholding on Discrete Wavelet Transform (DWT) coefficients or Empirical Mode Decomposition (EMD) of the signal, however, in these methods, it is necessary to calculate the SNR value to determine the appropriate threshold for noise removal. To solve this problem, a combined model based on EMD and Artificial Neural Network (ANN) trained with different SNRs (0, 5, 10, 15, and 20dB) is proposed in this research. The model can denoise white and pink noises in the range of -2 to 20dB without thresholding or even estimating SNR, and at the same time, keep the main content of the LS signal well. The proposed method is also compared with the EMD-custom method, and the results obtained from the SNR, and fit criteria indicate the absolute superiority of the proposed method. For example, at SNR = 0dB, the combined method can improve the SNR by 9.41 and 8.23dB for white and pink noises, respectively, while the corresponding values are respectively 5.89 and 4.31dB for the EMD-Custom method.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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