消除數(shù)字濾波器中Gibbs現(xiàn)象的研究

針對(duì)數(shù)字濾波器中存在的Gibbs現(xiàn)象，研究了改進(jìn)窗函數(shù)與改變?yōu)V波因子截?cái)嚅L(zhǎng)度綜合法。鑒于該方法通帶和阻帶的截止頻率不易控制的缺點(diǎn)，提出了消除Gibbs現(xiàn)象的一種全新的方法即數(shù)據(jù)翻轉(zhuǎn)法，方法是對(duì)輸入信號(hào)在沒進(jìn)入濾波器
之前對(duì)其進(jìn)行變換來盡量減少Gibbs現(xiàn)象帶來的影響。仿真結(jié)果表明，與上述綜合法比，數(shù)據(jù)翻轉(zhuǎn)法能更有效地消除Gibbs
現(xiàn)象。
關(guān)鍵詞:Gibbs現(xiàn)象:數(shù)據(jù)翻轉(zhuǎn);數(shù)字濾波器
AS tudyingo fE liminatingG ibbsP henomenonin D igitalF ilter
Wa ng X iuf ang Zh an gG ua ng hu a C hen X ue son g
(De pa rtm en to f a u to m atio n a nd c ont rolen gineering,D aqingp etroleumI nstitute,D aqing1 63318)
Abstract: Aimed at Gibbs phenomenon existed in digital filters, synthetic method of both improved window functions and changed
truncation length of filter factors is studied. Being dificult to control cut-of frequency of passband and band-rejection, A new
methodo fd atafl ippingi sp roposed.T hism ethodr educese fectw hichG ibbsp henomenonb ringsv iac onvertingin putsi gnalbe fore
coming into filters. Emulational results indicate that data flipping method can be more efective to delete Gibbs phenomenon
compared with synthetic method.
Keyword:G ibbsp henomenon;da tafil pping;di gitalfi lter