Problem in Noised chirp signal

I need to make a noised chirp signal between 1s and 2 second, but i couldn't run the code as below i get errors

   f0=200;
  f1=350;
  FS=700;
  tglobal=0:1/FS:3;
  signal=chirp(tglobal,f0,1,f1);
  %plot(tglobal,signal);
  noise=randn(length(tglobal),1);
  for x=0:1/FS:3
      if x>=1 || x<=2
       x=x+1;
          signal1=randn(size(x.*FS+1),1);
          signal=chirp(x,f0,1,f1)+signal1;
          figure(1);
      end
  end
   figure(3);
      plot(tglobal,signal);