Quantization

Digital Communications Systems

This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Quantization”.

1. Spread spectrum is used for
a) Encrypting signal
b) Hiding signal
c) Encrypting & Hiding signal
d) None of the mentioned

2. Which is a quantization process?
a) Rounding
b) Truncation
c) Rounding & Truncation
d) None of the mentioned

3. Quantization is a _____ process.
a) Few to few mapping
b) Few to many mapping
c) Many to few mapping
d) Many to many mapping

4. Quantization is a _____ process.
a) Non linear
b) Reversible
c) Non linear & Reversible
d) None of the mentioned

5. Which conveys more information?
a) High probability event
b) Low probability event
c) High & Low probability event
d) None of the mentioned

6. If the channel is noiseless information conveyed is ___ and if it is useless channel information conveyed is ___
a) 0,0
b) 1,1
c) 0,1
d) 1,0

7. The mutual information between a pair of events is
a) Positive
b) Negative
c) Zero
d) All of the mentioned

8. The output of the source encoder is an analog signal.
a) True
b) False

9. The output of an information source is
a) Random
b) Deterministic
c) Random & Deterministic
d) None of the mentioned

10. When the base of the logarithm is e, the unit of measure of information is
a) Bits
b) Bytes
c) Nats
d) None of the mentioned

11. Uniform quantizer is also known as
a) Low rise type
b) Mid rise type
c) High rise type
d) None of the mentioned

12. The SNR value can be increased by _____ the number of levels.
a) Increasing
b) Decreasing
c) Does not depend on
d) None of the mentioned

13. Prediction gain _____ for better prediction.
a) Increases
b) Decreases
c) Remains same
d) None of the mentioned

14. Delta modulation is
a) 1 bit DPCM
b) 2 bit DPCM
c) 4 bit DPCM
d) None of the mentioned

15. 1 bit quantizer is a
a) Hard limiter
b) Two level comparator
c) Hard limiter & Two level comparator
d) None of the mentioned

16. If step size is increased _____ occurs.
a) Slope overload distortion
b) Granular noise
c) Slope overload distortion & Granular noise
d) None of the mentioned

17. Which helps in maintaining the step size?
a) Delta modulation
b) PCM
c) DPCM
d) Adaptive delta modulation

18. The low pass filter at the output end of delta modulator depends on
a) Step size
b) Quantization noise
c) Bandwidth
d) None of the mentioned

19. In early late timing error detection method if the bit is constant, then the slope will be
a) Close to zero
b) Close to infinity
c) Close to origin
d) None of the mentioned

20. The theoretical gain in zero crossing TED is greater than early late TED.
a) True
b) False

21. Non uniform quantizer ______ distortion.
a) Increases
b) Decreases
c) Does not effect
d) None of the mentioned

22. Vector quantization is used in
a) Audio coding
b) Video coding
c) Speech coding
d) All of the mentioned

23. The spectral density of white noise is
a) Exponential
b) Uniform
c) Poisson
d) Gaussian

24. The probability density function of the envelope of narrow band noise is
a) Uniform
b) Gaussian
c) Rayleigh
d) Rician

25. The type of noise that interferes much with high frequency transmission is
a) White
b) Flicker
c) Transit time
d) Shot

26. Thermal noise power of a resistor depends upon
a) Its resistance value
b) Noise temperature
c) Bandwidth
d) Ambient temperature

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