Digital Communications

Quantization

Question 1
Marks : +2 | -2
Pass Ratio : 100%
If the channel is noiseless information conveyed is ___ and if it is useless channel information conveyed is ___
0,0
1,1
0,1
1,0
Explanation:
If the channel is noiseless information conveyed is 1 and if it is useless channel information conveyed is 0.
Question 2
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 3
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 4
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 5
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 6
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 7
Marks : +2 | -2
Pass Ratio : 100%
The theoretical gain in zero crossing TED is greater than early late TED.
True
False
Explanation:
The theoretical gain in zero crossing timing error detection is twice more than that in the early late timing error detection method.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
1 bit quantizer is a
Hard limiter
Two level comparator
Hard limiter & Two level comparator
None of the mentioned
Explanation:
1 bit quantizer is also called as two level comparator and also as hard limiter.
Question 9
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 10
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.