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EE451L Fall 2008 Lab: Amplitude Modulation and Demodulation - Prof. Hector Erives, Lab Reports of Digital Signal Processing
A lab assignment for ee451l students in the fall 2008 semester. The assignment involves designing and implementing an am modulator using a sinusoidal message signal, and analyzing the frequency response and demodulation process. Students are required to write equations, generate matlab code, and sketch the magnitude of the frequency response.
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**EE451L Fall 2008
The Prelab** For this lab you will need to create an AM modulator. Use fs =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. Amplitude Modulation
- Why do we modulate?
- How would you go about generating your message signal. Write all the equations that you will need.
- Write a MATLAB code to generate your AM signal.
- Sketch the magnitude of the frequency response. Amplitude Demodulation
- On a magnitude spectrum plot identify: (a) where is the passband, (b) where is the stopband, (c) where is the transition band. Also, explain what is meant by passband ripple and stopband ripple.
- Use MATLAB to create an elliptic filter with the following specifications: Rp = 0.1 dB and Rs = 50 dB. What is the order of the filter?
- Use MATLAB to express the filter as a cascade of second-order systems. You can use fdatool.