Digital Signal Processing Multiple Choice Questions and Answers

Questions

1 Which of the following defines the weighted approximation error?

A W(ω)[Hdr(ω)+Hr(ω)]

B W(ω)[Hdr(ω)-Hr(ω)]

C W(ω)[Hr(ω)-Hdr(ω)]

D None of the mentioned

View Answer

Answer:W(ω)[Hdr(ω)-Hr(ω)]

2 The error function E(ω) does not alternate in sign between two successive extremal frequencies.

A True

B False

View Answer

Answer:False

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3 At most how many extremal frequencies can be there in the error function of ideal low pass filter?

A L+1

B L+2

C L+3

D L

View Answer

Answer:L+3

4 The filter designs that contain more than L+2 alternations are called as ______________

A Extra ripple filters

B Maximal ripple filters

C Equi ripple filters

D None of the mentioned

View Answer

Answer:Extra ripple filters

5 If M is the length of the filter, then at how many number of points, the error function is computed?

A 2M

B 4M

C 8M

D 16M

View Answer

Answer:16M

6 If |E(ω)|< δ for some frequencies on the dense set, then a new set of frequencies corresponding to the L+2 largest peaks of |E(ω)| are selected and computation is repeated.

A True

B False

View Answer

Answer:False

7 What is the value of JTYPE in the Parks-McClellan program for a Hilbert transformer?

A 1

B 2

C 3

D 4

View Answer

Answer:3

8 In Parks-McClellan program, the grid density for interpolating the error function is denoted by which of the following functions?

A NFILT

B NBANDS

C EDGE

D -LGRID

View Answer

Answer:-LGRID

9 In Parks-McClellan program, an array of maximum size 10 that specifies the desired frequency response in each band is denoted by?

A WTX

B FX

C EDGE

D None of the mentioned

View Answer

Answer:FX

10 If δ₁ represents the ripple in the pass band for a chebyshev filter, then which of the following conditions is true?

A 1-δ1 ≤ Hr(ω) ≤ 1+δ1; |ω|≤ωP

B 1+δ1 ≤ Hr(ω) ≤ 1-δ1; |ω|≥ωP

C 1+δ1 ≤ Hr(ω) ≤ 1-δ1; |ω|≤ωP

D 1-δ1 ≤ Hr(ω) ≤ 1+δ1; |ω|≥ωP

View Answer

Answer:1-δ1 ≤ Hr(ω) ≤ 1+δ1; |ω|≤ωP

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