【摘要】 分别将傅里叶低通滤波器方法、21点平均法和小波方法用于一种贫煤DTG信号的消噪中,发现小波法效果较好.当小波基为bior 6.8,sqtwolog阈值规则时,其消噪效果最优.通过对滤除噪声的特性分析发现,小波方法和21点平均法滤除的噪声具有独立分布特性,且类似高斯分布.更多还原

【Abstract】 Denoise of derivative hermogravimetry(DTG) signal of a kind of lean coal by Fourier low-pass filter,21-point average method and wavelet threshold method was studied.Results show that the wavelet threshold method is better among method above from the parameter of power spectrum,signal/noise and time shift.When the wavelet basis is bior 6.8 and the threshold method is sqwtolog,the effect of denoise quality with wavelet threshold method is the best one.Statistics characters of the noises that filtered by wavelet threshold method and 21-point average method show that they are independent distribution and similar to Gauss distribution.更多还原