Digital Signal Processing Questions and Answers | Digital Signal Processing MCQs

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Questions
1 If an LTI system is described by the difference equation y(n)=ay(n-1)+bx(n), 0 < a < 1, then what is the parameter ‘b’ so that the maximum value of |H(ω)| is unity?
A a
B 1-a
C 1+a
D none of the mentioned

Answer:1-a
2 The output of the Linear time invariant system cannot contain the frequency components that are not contained in the input signal.
A True
B False

Answer:True
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3 An ideal filter should have unity gain in their stop band.
A True
B False

Answer:False
4 Which filter has a magnitude frequency response as shown in the plot given below?

Digital Signal Processing

A Low pass Filter
B High pass Filter
C Band pass Filter
D Band stop Filter

Answer:Band stop Filter
5 An ideal filter should have zero gain in their stop band.
A True
B False

Answer:True
6 The ‘Envelope delay’ or ‘Group delay’ is the time delay that the signal component of frequency ω undergoes as it passes from the input to the output of the system.
A True
B False

Answer:True
7 If the phase ϴ(ω) of the system is linear, then the group delay of the system?
A Increases with frequency of signal
B Constant
C Decreases with frequency of signal
D Independent of frequency of signal

Answer:Constant
8 If hlp(n) denotes the impulse response of a low pass filter with frequency response Hlp(ω), then what is the frequency response of the high pass filter in terms of Hlp(ω)?
A Hlp(ω-π/2)
B Hlp(ω+π/2)
C Hlp(ω-π)
D Hlp(ω+π)

Answer:Hlp(ω-π)
9 If the low pass filter described by the difference equation y(n)=0.9y(n-1)+0.1x(n) is converted into a high pass filter, then what is the frequency response of the high pass filter?
A 0.1/(1+0.9ejω)
B 0.1/(1+0.9e-jω)
C 0.1/(1-0.9ejω)
D None of the mentioned

Answer:0.1/(1+0.9e-jω)
10 A digital resonator is a special two pole band pass filter with the pair of complex conjugate poles located near the unit circle.
A True
B False

Answer:True

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