Digital Communications

Quantization

Question 1
Marks : +2 | -2
Pass Ratio : 100%
The mutual information between a pair of events is
Positive
Negative
Zero
All of the mentioned
Explanation:
The mutual information between a pair of events can be positive negative or zero.
Question 2
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 3
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.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Uniform quantizer is also known as
Low rise type
Mid rise type
High rise type
None of the mentioned
Explanation:
Uniform quantizer is also known as mid rise type quantizer.
Question 5
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 6
Marks : +2 | -2
Pass Ratio : 100%
If step size is increased _____ occurs.
Slope overload distortion
Granular noise
Slope overload distortion & Granular noise
None of the mentioned
Explanation:
When step size is increased to prevent slope overload distortion, granular noise occurs.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
The output of the source encoder is an analog signal.
True
False
Explanation:
The output of the source encoder is a sequence of binary digits. The conversion of source output to digital form is done here in source encoder.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Quantization is a _____ process.
Few to few mapping
Few to many mapping
Many to few mapping
Many to many mapping
Explanation:
Quantization is a many to few mapping process.
Question 9
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 10
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).