function y = invwave( x )
% WAVELET Take Daubechies 4 tap wavelet transform

[ m, n ] = size( x );
y = x;
size = n;

while size >= 8
	size = size / 2;
end

while size <= n
	y( 1:size ) = invdau4( y( 1:size ) );
	size = size * 2;
end