function [x,Ta] = Reconstroi (X, f)
  
  X = ifftshift(X);
  x = ifft(X);
  
  fa = f(end)*2; %%%%
  Ta = 1/fa;
  
  N = length(x);
  t = [0:(N-1)]'*Ta;
  
  plot(t,x);
  xlabel("Tempo (seg)");
  ylabel("Sinal x(t)");
end