31-01-2013, 12:58 PM
DSP Question Bank
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UNIT-I
1 . (a) Define the following terms as referred to LTI discrete time system:
i. Stability
ii. Causality
iii. Time invariance
iv. Linearity.
(b) Determine whether the following system is
i. Linear
ii. Causal
iii. Stable
iv. Time invariant
y (n) = log10 |x (n)| Justify your answer ?
2. Determine the following signal are power, energy or neither energy nor power
i) x(n)= (1/3)n u(n)
ii) x(n)= ej((nп/4)+(п/4))
iii) x(n)= e2n u(n)
iv) x(n)= sin(пn/4)
3. Define the following types of systems
i) Linear & Non-Linear
ii) Time-Variant & Time-Invariant
iii) Casual & Non-Casual
iv) Stable and Unstable.
4. a) Explain about Recursive & Non-Recursive systems with the help of Block Diagrams?
b) List out the Advantages of DSP over ASP? Also List out Applications of DSP?
5. a) Define Symmetric & Asymmetric Signals with example?
b) Define Periodic and Aperiodic signal. State whether the following signal is periodic or
not
x(n)= ej6пn
6. Determine the total Response y(n) ; n≥0 to the difference equation y(n)+ a1y(n-1)= x(n)
when x(n) is a Unit Step Sequence & y(-1) is initial Condition?