Digital Signal Processing Questions and Answers, Set 21

Digital Signal Processing Questions and Answers

Q1. 

What is the approximate transition width of the main lobe of a Blackman window?

Answer :  

12π/M

Q2. 

The width of each side lobe decreases with an increase in M.

Answer :  

True

Q3. 

The lower and upper limits on the convolution sum reflect the causality and finite duration characteristics of the filter.

Answer :  

True

Q4. 

What is the number of filter coefficients that specify the frequency response for h(n) anti-symmetric?

Answer :  

(M-1)/2 when M is odd and M/2 when M is even

Q5. 

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

Answer :  

True

Q6. 

The oscillations in the output of the recursive system are called ‘limit cycles’.

Answer :  

True

Q7. 

The limit cycle mode with zero input, which occurs as a result of rounding the multiplications, corresponds to an equivalent second-order system with poles at z=±1.

Answer :  

True

Q8. 

In a bilinear transformation, the left-half s-plane is mapped to which of the following in the z-domain?

Answer :  

Entirely inside the unit circle |z|=1

Q9. 

The Chebyshev-I filter is equi-ripple in the pass band and monotonic in the stop band.

Answer :  

True

Q10. 

What is the value of the Chebyshev polynomial of degree 1?

Answer :  

x

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