Homework-4

1. When our filmi hero in movies is chasing (in a tonga) the villain (driving a car) why do the tonga wheels appear to be moving backwards ?
2. How can we understand the 'highest frequency' in terms of a visual image , such as a photograph or a TV show ?
3. A discrete-time signal x[n] is defined as
              (1 + n/3) for -3 < n < -1
  x[n] =   1            for 0 < n < 3
               0             elsewhere

a. Determine its values and sketch the signal x[n]
b. Sketch the signals that result if we :
      b1. First fold x[n] and then delay the resulting signal by four samples.
      b2. First delay x[n] by four samples and then delay the signal
c. Sketch the signal x[-n + 4]
d. Compare the results in part b. c. and derive a rule for obtaining the signal x[-n + k] from x[n].


Good Day