In part four , a new method of design linear phase filter banks with sopot ( sum of powers of two ) coefficients is presented on the basis of perfect reconstruction lattice structure filter banks 第四部分,在完全重構(gòu)線性相位格型濾波器組的基礎(chǔ)上,我們提出了一種設(shè)計無乘法的線性相位濾波器組的新方法,實驗證明該方法是有效的。