信号处理中去噪算法的改进仿真

英文篇名：Simulation of improved denoising algorithm in signal processing
中文刊名：计算机工程与应用
英文刊名：Computer Engineering and Applications
作者：刘跃华 ; 曾迎生
英文作者：LIU Yue-hua1 ; ZENG Ying-sheng21.Department of Computer and Electronic Engineering ; Hunan Business College ; Changsha 410205 ; China 2.Institute of Mechatronics and Automation ; National University of Defense Technology ; Changsha 410073 ; China
中文关键词：小波变换 ; 模极大值去噪 ; 交替投影法
英文关键词：wavelet transform ; denoising of modulus maximum ; Alternating Projection(AP) algorithm
出版日期：2009-02-01
机构：湖南商学院计算机与电子工程学院;国防科技大学机电工程与自动化学院自动化研究所;
年：2009
期：04
出版单位：计算机工程与应用

摘要

针对信号处理中交替投影法去噪计算量大的缺点,提出了改进方法,改进后的方法首先利用Ad hoc算法求出信号的模极大值,然后对模极大值点分段进行抛物线插值,从而得到信号的估计小波系数,最后利用估计小波系数重构信号,实现去噪的目的。仿真实验证明:该方法能有效去除噪声,与交替投影法相比,该算法在原理上更简单,程序实现更容易,去噪速度更快,是更加实用的方法,特别是便于用硬件实现。
Aiming at the high cost of the AP algorithm's computation in the signal processing,an improved method has been proposed in this paper.Firstly the modulus maximum of the signal is calculated by the Ad hoc algorithm in the improved method,then the signal estimated coefficients of wavelet can be obtained from the parabola's inserted value of subsection between the points of modulus maximum,finally the purpose of denoising can be achieved by the signal reconstruction based on these coefficients.The simulation results show that the method can filter noises effectively and the principle of the method is more simple and which makes the program can be completed more easily and the speed of denoising is higher and the method is more practical compared with AP algorithm,especially more convenient to realize it by hardware.

引文

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