title: how to show a modulate signal in Matlab simulink
body: <p>i want to show the signal modulate in simulink but i don't know how to make it
  <img src="https://i.stack.imgur.com/kN64M.png" alt="enter image description here">
  <img src="https://i.stack.imgur.com/M6AfK.png" alt="enter image description here"></p>