消除数字滤波器中Gibbs现象的研究

针对数字滤波器中存在的Gibbs现象，研究了改进窗函数与改变滤波因子截断长度综合法。鉴于该方法通带和阻带的截止频率不易控制的缺点，提出了消除Gibbs现象的一种全新的方法即数据翻转法，方法是对输入信号在没进入滤波器
之前对其进行变换来尽量减少Gibbs现象带来的影响。仿真结果表明，与上述综合法比，数据翻转法能更有效地消除Gibbs
现象。
关键词:Gibbs现象:数据翻转;数字滤波器
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