% hilosync.m
% usage: Y = hilosync(X,l,h) 
% Performs a low pass high pass synthesis on the columns of X.
% It is assumed that length(h), length(l) <= #rows(X) 
% both l and h are time reversed 

function Y=hilosync(X,l,h)
m = size(X,1);
l = l(:);
h = h(:);
Xl = X(1:(m/2),:);
Xh = X((m/2+1):m,:);
Y = crevconv2(upc(Xl),l)+crevconv2(upc(Xh),h);