Digital Signal Processing Questions and Answers | Digital Signal Processing MCQs

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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

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

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

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

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

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

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

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

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

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

Answer:1-δ1 ≤ Hr(ω) ≤ 1+δ1; |ω|≤ωP

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