%approximations
iter=7;
[LO_D,HI_D,LO_R,HI_R] = WFILTERS('db2');
h=LO_R * 2 / sum(LO_R)

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