Wavelet packet decomposition based on entropy threshold for white - noise rejection in pd signal 基于門限值小波包變換抑制局部放電白噪干擾
On the base of briefly introducing the wavelet analysis theory and nonlinear wavelet de - noising theory by soft - thresbolding , some examples of signal recovery with white - noise heavily polluted are given in the paper 本文在簡述了小波分析及噪聲分離的非線性小波理論的基礎(chǔ)上,給出了從噪聲污染信號(hào)中恢復(fù)原信號(hào)的實(shí)例。
Employing the random walk model , the white - noise models and nonlinear models to test the weak efficient market of china " s capital market , this essay find that china " s capital market hasn " t reached the lowest efficient market 本研究采用隨機(jī)游走模型( therandomwalkmodel ) 、白噪聲過程模型( thewhite - noisemodels )和非線性模型( nonlinearmodels )對(duì)我國資本市場(chǎng)進(jìn)行弱型有效市場(chǎng)檢驗(yàn),結(jié)果表明,迄今為止我國資本市場(chǎng)還沒有達(dá)到最低層次的有效市場(chǎng)狀態(tài)。
In chapter 4 , i performed the analyzing work with wavelet and fastica and find that wavelet was a high efficient way to filter the cep signal when i set the wavelet and scaling function to haar , decomposing level to 4 , threshold method to fixed to threshold and white - noise structure to scaled white - noise . it took the advantage that reduced the accumulating times to 60 with more smooth signal and less distortion . but fastica takes no advantage on this facet 本文通過小波變換和獨(dú)立分量快速分析模式識(shí)別的方法對(duì)cep數(shù)據(jù)進(jìn)行了分析處理,同時(shí)與數(shù)字低通橢圓濾波器的處理效果進(jìn)行了比較,發(fā)現(xiàn)用小波對(duì)cep的數(shù)據(jù)進(jìn)行濾波處理時(shí),可以將數(shù)據(jù)的疊加次數(shù)從120降低到60次左右,且信號(hào)的質(zhì)量要比以前的處理方法好;但是獨(dú)立分量快速分析方法效果不很好。