Digital Communications

Quantization

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Delta modulation is
1 bit DPCM
2 bit DPCM
4 bit DPCM
None of the mentioned
Explanation:
Delta modulation is also considered as 1 bit DPCM.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Which helps in maintaining the step size?
Delta modulation
PCM
DPCM
Adaptive delta modulation
Explanation:
Step size if effectively maintained using adaptive delta modulation.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
When the base of the logarithm is e, the unit of measure of information is
Bits
Bytes
Nats
None of the mentioned
Explanation:
The unit of measure of information is determined based on the base of logarithm. If the base is e then the unit is nats( natural unit).
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Prediction gain _____ for better prediction.
Increases
Decreases
Remains same
None of the mentioned
Explanation:
Prediction gain increases for better prediction.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Spread spectrum is used for
Encrypting signal
Hiding signal
Encrypting & Hiding signal
None of the mentioned
Explanation:
Spread spectrum is used for hiding and encrypting signals.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Which is a quantization process?
Rounding
Truncation
Rounding & Truncation
None of the mentioned
Explanation:
Rounding and truncation are examples of quantization process.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
The SNR value can be increased by _____ the number of levels.
Increasing
Decreasing
Does not depend on
None of the mentioned
Explanation:
The signal to noise ratio can be increased by increasing the number of levels.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Which conveys more information?
High probability event
Low probability event
High & Low probability event
None of the mentioned
Explanation:
High probability event conveys less information than a low probability event.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Quantization is a _____ process.
Non linear
Reversible
Non linear & Reversible
None of the mentioned
Explanation:
Quantization is a non linear and irreversible process.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
The low pass filter at the output end of delta modulator depends on
Step size
Quantization noise
Bandwidth
None of the mentioned
Explanation:
The design of low pass filter at the output end of delta modulator depends on bandwidth.