Code: A-23
Time: 3 Hours
Subject: DIGITAL SIGNAL PROCESSING
Max. Marks: 100

NOTE: There are 11 Questions in all.

  • Question 1 is compulsory and carries 16 marks. Answer to Q. 1. must be written in the space provided for it in the answer book supplied and nowhere else.
  • Answer any THREE Questions each from Part I and Part II. Each of these questions carries 14 marks.
  • Any required data not explicitly given, may be suitably assumed and stated.
Q.1       Choose the correct or best alternative in the following: (2x8)

a. The digital system is
 

(A) linear and causal.
(C) non-linear and causal.

 (B) linear and non-causal.
(D) ) non-linear and non-causa
b. The unit step sequence u (n) is
 

(A) a power signal.
(C) power as well as energy signal.

(B) an energy signal
(D) neither power nor energy signal.
c.

If ROC of the z-transform of a sequence x (n) is outside a circle of radius r1, then sequence x (n) is
 

(A growing sequence.
(C) decaying sequence.

(B) non-causal.
(D) causal and decaying.
d. The z-transform of u (-n) is
 

(A)
(C)

(B)
(D)

e. A digital filter is said to be IIR if
  (A) present output depends on previous output only.
(C) all its poles lie outside the unit circle. 		(B) system function H(z) has one or more non-zero denominator coefficients.
(D) system function has only zeros.
f. The transition width of the main lobe of a Blackman window of length N is
  (A) 4/N
(C) 8/N
 (B) 6/N
(D) 12/N

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