Midterm Tips and Some Notes on That

Midterm exam will be on the regular lecture time (9:00 Tuesday, April 5)

Closed book, no cheat-sheet. Bring your calculator!

Tips before the midterm exam:

• Check this blog regularly before the midterm. I might add some more tips.
• Make sure that you can answer all of the previous homework questions and the following questions:
• Ruminate on Fig. 4.24 and 4.25. Try to guess magnitude of FFT of other geometrical shapes and that of their rotated versions. 

About the figure below: 

• Find out what you would see in frequency domain (draw) if you sample the following signal in
• 250,
• 200,
• 150 and
• 100 Hz.
•  After sampling it, in which cases is it possible to perfectly recover the original signal? 
• For each case where there is no aliasing, How do you recover the original signal after sampling it ? (what kind of filter would you apply to it in freq. domain? (Box?) What are its cutoff frequencies?) 
• For each case where there is aliasing, before sampling the signal, What would you do to prevent aliasing ? (Give numerical values of your filter.)