%approximations close all; clear all; iter=8; [LO_D,HI_D,LO_R,HI_R] = WFILTERS('db5'); h=LO_R * 2 / sum(LO_R) h(2)=h(2)+0.01 K=length(h)-1; S=2^iter; p=ones(1,S); hu=upsam(h,S); for iter =1:iter my_conv=conv(hu,p); p=my_conv(1:2:length(my_conv)); plot(p); pause; end