Digital Signal Processing Multiple Choice Questions and Answers

Questions

1 The magnitude function |H(ω)| can be zero at some frequencies, but it cannot be zero over any finite band of frequencies.

A True

B False

View Answer

Answer:True

2 If h(n) is causal and h(n)=h_e(n)+h_o(n),then what is the expression for h(n) in terms of only h_e

A h(n)=2h_e(n)u(n)+h_e(0)δ(n), n ≥ 0

B h(n)=2h_e(n)u(n)+h_e(0)δ(n), n ≥ 1

C h(n)=2h_e(n)u(n)-h_e(0)δ(n), n ≥ 1

D h(n)=2h_e(n)u(n)-h_e(0)δ(n), n ≥ 0

View Answer

Answer:h(n)=2h_e(n)u(n)-h_e(0)δ(n), n ≥ 0

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3 If h(n) is causal and h(n)=h_e(n)+h_o(n),then what is the expression for h(n) in terms of only h_o(n)?

A h(n)=2h_o(n)u(n)+h(0)δ(n), n ≥ 0

B h(n)=2h_o(n)u(n)+h(0)δ(n), n ≥ 1

C h(n)=2h_o(n)u(n)-h(0)δ(n), n ≥ 1

D h(n)=2h_o(n)u(n)-h(0)δ(n), n ≥ 0

View Answer

Answer:h(n)=2h_o(n)u(n)+h(0)δ(n), n ≥ 1

4 If h(n) is absolutely summable, i.e., BIBO stable, then the equation for the frequency response H(ω) is given as?

A H_I(ω)-j H_R(ω)

B H_R(ω)-j H_I(ω)

C H_R(ω)+j H_I(ω)

D H_I(ω)+j H_R(ω)

View Answer

Answer:H_R(ω)+j H_I(ω)

5 H_R(ω) and H_I(ω) are interdependent and cannot be specified independently when the system is causal.

A True

B False

View Answer

Answer:True

6 What is the Fourier transform of the unit step function U(ω)?

A πδ(ω)-0.5-j0.5cot(ω/2)

B πδ(ω)-0.5+j0.5cot(ω/2)

C πδ(ω)+0.5+j0.5cot(ω/2)

D πδ(ω)+0.5-j0.5cot(ω/2)

View Answer

Answer:πδ(ω)+0.5-j0.5cot(ω/2)

7 The H_I(ω) is uniquely determined from HR(ω) through the integral relationship. This integral is called as Continuous Hilbert transform.

A True

B False

View Answer

Answer:False

8 The magnitude |H(ω)| cannot be constant in any finite range of frequencies and the transition from pass-band to stop-band cannot be infinitely sharp.

A True

B False

View Answer

Answer:True

9 The frequency ωP is called as ______________

A Pass band ripple

B Stop band ripple

C Pass band edge ripple

D Stop band edge ripple

View Answer

Answer:Pass band edge ripple

10 Which of the following represents the bandwidth of the filter?

A ωP+ ωS

B -ωP+ ωS

C ωP-ωS

D None of the mentioned

View Answer

Answer:-ωP+ ωS

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