摘要
本文在分析了随机噪声的子波变换系数在不同尺度上的传递特性以及噪声信号奇异性与子波模极大值的关系后 ,提出了用尺度间变化的门限值来抑制带噪湍流信号在不同尺度上的噪声子波系数 ,从而实现了在重构湍流信号中消除噪声的目的 .本文给出了湍流信号的子波去噪的计算机仿真结果 ,并与傅立叶去噪进行了比较 ,从结果上看 。
Based on the characteristics of random noise wavelet transform on different scales and the relationship between the noise Lipschitz and its wavelet modulus maximum, an algorithm was presented where the wavelet transform coefficients of noise-turbulent signal were filtered by changeable threshold so as to reduce the noise in turbulent signal. Some computer de-noising simulation results were given. The results showed that the method was effective both in removing the noise and in enhancing the SNR of the signal.
出处
《实验力学》
CSCD
北大核心
2001年第4期433-437,共5页
Journal of Experimental Mechanics
