Digital Signal Processing Multiple Choice Questions and Answers

(1) What is the condition of M, if the structure according to the direct form is as follows?

[A] M even

[B] M odd

[C] All values of M

[D] Doesn’t depend on value of M

Answer: M odd

(2) By combining two pairs of poles to form a fourth order filter section, by what factor we have reduced the number of multiplications?

[A] 25%

[B] 30%

[C] 40%

[D] 50%

Answer: 50%

(3) The realization of FIR filter by frequency sampling realization can be viewed as cascade of how many filters?

[A] Two

[B] Three

[C] Four

[D] None of the mentioned

Answer: Two

(4) The zeros of the system function of comb filter are located at ______________

[A] Inside unit circle

[B] On unit circle

[C] Outside unit circle

[D] None of the mentioned

Answer: On unit circle

(5) Where does the poles of the system function of the second filter locate?

[A] e^j2π(k+α)M

[B] e^j2π(k+α)/M

[C] e^j2π(k-α)/M

[D] e^jπ(k+α)/M

Answer: e^j2π(k+α)/M

(6) When the desired frequency response characteristic of the FIR filter is narrowband, most of the gain parameters {H(k+α)} are zero.

[A] True

[B] False

Answer: True

(7) Which of the following filters have a cascade realization as shown below?

[A] IIR filter

[B] Comb filter

[C] High pass filter

[D] FIR filter

Answer: FIR filter

(8) Which of the following is the application of lattice filter?

[A] Digital speech processing

[B] Adaptive filter

[C] Electroencephalogram

[D] All of the mentioned

Answer: All of the mentioned

(9) What is the unit sample response of the m^th filter?

[A] h_m(0)=0 and h_m(k)=αm(k), k=1,2…m

[B] h_m(k)=αm(k), k=0,1,2…m(αm(0)≠1)

[C] h_m(0)=1 and h_m(k)=αm(k), k=1,2…m

[D] none of the mentioned

Answer: h_m(0)=1 and h_m(k)=αm(k), k=1,2…m

(10) The FIR filter whose direct form structure is as shown below is a prediction error filter.

[A] True

[B] False

Answer: True

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