Factor D Decimation MCQ’s

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This set of Digital Signal Processing Multiple Choice Questions & Answers (MCQs) focuses on “Factor D Decimation”.

1. If HD(ω) is the frequency response of the low pass filter, then for what value of ω, HD(ω)=1?
a) |ω| = π/D
b) |ω| ≥ π/D
c) |ω| ≤ π/D
d) None of the mentioned

2. The linear filtering operation followed by down sampling on x(n) is not time invariant.
a) True
b) False

3. Which of the following is true about the filtering operation on x(n)?
a) Linear
b) Time variant
c) None of the mentioned
d) Linear and time invariant

4. If we down-sample a signal x(n), then the resulting signal will be an aliased version of x(n).
a) True
b) False

5. The filter eliminates the spectrum of X(ω) in the range π/D < ω < π.
a) True
b) False

6. If x(n) produces y(m), then x(n-n0) does imply y(n-n0) for any value of n0.
a) True
b) False

7. Which of the following gives the equation for y(m)?
a) v(mD)
b) p(mD)
c) v(mD).p(mD)
d) none of the mentioned

8. What is the folding frequency for the aliased version of x(n) with sampling rate F?
a) F/D
b) F/4D
c) F/2
d) F/2D

9. We need not relate the spectrum of y(m) to spectrum of x(n) to obtain frequency response characteristic of y(m).
a) True
b) False

10. To what value should the bandwidth of x(n) has to be reduced in order to avoid aliasing?
a) F/D
b) F/2D
c) F/4D
d) None of the mentioned

11. The sequence v¯(n) can be obtained by multiplying v(n) with a signal p(n) of period D.
a) True
b) False

12. Which process has a block diagram as shown in the figure below?

a) Sampling rate conversion
b) Interpolation
c) Decimation
d) None of the mentioned

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