Clarification
for 2.12 (b)
(b) Is the system linear “for x[n] = delta[n]”?
You don’t need to show the system is linear for any x[n]. Check it for x[n] = delta[n] only!
No formal proof is required. Just plug in x[n] = a * delta[n] + b * delta[n] and show y[n] = (a+b) * n! * u[n] by performing recursion.
Incorrect Textbook Answer
Correct answer should be
p.836
5.4 (b) h[n] = (3/4)^n * u[n] – 2 * (3/4)^(n-1) * u[n-1]
Q) In 5.36(c), can we
use MATLAB to sketch the magnitude response?
A) I don't think you need Matlab to "sketch" the response. Just rough sketch by hand is fine. If you want to use Matlab, it is also fine.
Last modified: Jan. 14, 2008