Super resolution pitch detection based on band - partitioning spectral entropy and signal decomposition in dct domain 分帶譜熵與信號分解的高精度基音檢測算法
In this paper , the theory of wavelet transformation in signal noise reduction is introduced , together with the algorithm of signal decomposition and reconstruction 摘要介紹采用小波變換進(jìn)行信號降噪的原理;利用小波分解和重構(gòu)函數(shù)對乳機主傳動軸應(yīng)力和扭矩信號進(jìn)行降噪處理。
In this thesis , we follow the idea of the beamlet - domain wave field extrapolation methods to construct localized propagators . through comparative study of signal decomposition efficiency using different representation schemes , we select two groups of basic functions with simple expressions and good localization properties for wave field decomposition , propagation and imaging 本論文通過對wft 、小波基、小波包,以及相關(guān)的框架理論等的分析比較,選擇了兩組形式簡單,且具有適宜于波場外推特性的基本函數(shù)集合來進(jìn)行波場分解、傳播及偏移成像問題的研究。
4 ) a sparse matrix based on multi - resolution analysis for signal decomposition was introduced . a compression method for arbitrarily long data on chemical process was developed then . the relative error of decompression data is still acceptably small enough and the compression ratio is large enough when the method was applied to the compression decompression manipulation of historical data on chemical process 浙江大學(xué)博士學(xué)位論文4 )利用小波的多分辨率分析特點,推出了一個用于信號多分辨率分解的稀疏矩陣,在此基礎(chǔ)上給出了一種可對任意長度數(shù)據(jù)進(jìn)行壓縮的方法,并對化工過程的歷史數(shù)據(jù)進(jìn)行數(shù)據(jù)壓縮和還原,壓縮后的解壓縮數(shù)據(jù)仍保持較小的相對誤差,并得到了較大的壓縮比。
( 4 ) since there is no perfect theoretical guide , the characteristics of orthogonal wavelet , semi - orthogonal wavelet and biorthogonal wavelet in signal decomposition and reconstruction are compared , and the conclusion of the study demonstrates that semi - orthogonal wavelet is a good wavelet for fault diagnosis in tilting control system of tilting train . a new approach is presented for deciding the fault threshold . ( 5 ) a generalized wavelet neural network is put forward by integrating wavelet analysis with neural network ( 4 )針對小波基的選擇缺乏完善理論指導(dǎo)的實際情況,通過對常用的正交、半正交、雙正交小波基提取信號特性的比較,確定出了適合擺式列車傾擺控制系統(tǒng)故障診斷的小波基? ?半正交小波基,并提出了一種新的確定故障檢測閾值的方法,可以快速地檢測出故障發(fā)生時刻。