function x = sig_1_gen();
n = 1:1:32;
x = zeros(1, length(n));
x(1:17) = (n(1:17)-1)/16;
x(3) = 4*x(3);
x(10) = 2*x(10);
x(19:3:31) = 0.5*ones(1,length(n(19:3:32)));