Prelab Part I: AM Modulation

For this lab you will need to create an AM modulator. Use $f_S=48$kHz. For your message, have the program generate a sinusoidal signal. You should be able to vary the message frequency dynamically as your code is running.

1. Why do we modulate?
2. How would you go about generating your message signal. Don't use the $\sin$ function. Write all the equations that you will need.
3. Write a MATLAB code generate your AM signal.
4. Sketch the magnitude of the frequency response.