Digital Signal Processing Objective Type Questions and Answers

1 The process of converting discrete-time continuous valued signal into discrete-time discrete valued (digital) signal is known as ____________

A Sampling

B Quantization

C Coding

D None of the mentioned

View Answer

Answer:Quantization

2 The difference between the unquantized x(n) and quantized xq(n) is known as ___________

A Quantization coefficient

B Quantization ratio

C Quantization factor

D Quantization error

View Answer

Answer:Quantization error

3 Which of the following is a digital-to-analog conversion process?

A Staircase approximation

B Linear interpolation

C Quadratic interpolation

D All of the mentioned

View Answer

Answer:All of the mentioned

4 The relation between analog frequency ‘F’ and digital frequency ‘f’ is?

A F=f*T(where T is sampling period)

B f=F*T

C No relation

D None of the mentioned

View Answer

Answer:f=F*T

5 What is output signal when a signal x(t)=cos(2*pi*40*t) is sampled with a sampling frequency of 20Hz?

A cos(pi*n)

B cos(2*pi*n)

C cos(4*pi*n)

D cos(8*pi*n)

View Answer

Answer:cos(4*pi*n)

6 If ‘F’ is the frequency of the analog signal, then what is the minimum sampling rate required to avoid aliasing?

A F

B 2F

C 3F

D 4F

View Answer

Answer:F

7 What is the nyquist rate of the signal x(t)=3cos(50*pi*t)+10sin(300*pi*t)-cos(100*pi*t)?

A 50Hz

B 100Hz

C 200Hz

D 300Hz

View Answer

Answer:300Hz

8 What is the discrete-time signal obtained after sampling the analog signal x(t)=cos(2000*pi*t)+sin(5000*pi*t) at a sampling rate of 5000 samples/sec?

A cos(2.5*pi*n)+sin(pi*n)

B cos(0.4*pi*n)+sin(pi*n)

C cos(2000*pi*n)+sin(5000*pi*n)

D none of the mentioned

View Answer

Answer:cos(0.4*pi*n)+sin(pi*n)

9 If the sampling rate Fs satisfies the sampling theorem, then the relation between quantization errors of analog signal(eq(t)) and discrete-time signal(eq(n)) is?

A eq(t)=eq(n)

B eq(t)< eq(n)

C eq(t)>eq(n)

D not related

View Answer