function x = idtfs0(c)
%UNTITLED Summary of this function goes here
%   Detailed explanation goes here
    N = length(c);
    x = zeros(1, N);
    k = 0:N-1;
    for n = 1:N
        x(n) = sum(c.*exp(1i*2*pi*(n-1)*k/N));
    end
end

