【摘要】 研究了基于小波变换的信号降噪的原理和方法,从中选择阈值法降噪。详细论述了该方法的原理,特点和利用MatLAB中小波分析工具箱进行设计的步骤。对rigrsure,heursure,sqtwolog和minimax4种阈值选择方法进行了定性和定量比较,并实现了压力信号降噪的计算机仿真。通过比较,得出在处理实际输油管道泄漏的压力信号时,sqtwolog阈值选择方法能够更有效去除噪声。更多还原

【Abstract】 Researches the principle and method of the noise reduction based on wavelet transform, chooses the threshold noise reduc- tion, and describes in detail the principles, features and design steps of the threshold method by means of the wavelet analysis tool- box of MatLAB. Rigrsure, heursure, sqtwolog and minimaxi 4 kinds of threshold selection methods are compared qualitatively and quantitatively. Realizes computer simulation of the signal noise reduction. When dealing with the actual pressure signal of the oil pipeline leakage, sqtwolog threshold method shows more effective to eliminate noise.更多还原