Digital Communications

Quantization

Question 1
Marks : +2 | -2
Pass Ratio : 100%
In early late timing error detection method if the bit is constant, then the slope will be
Close to zero
Close to infinity
Close to origin
None of the mentioned
Explanation:
In early timing error detection method if the bit is constant and doesn’t change, then the slope will be close to zero.
Question 2
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 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%
The output of an information source is
Random
Deterministic
Random & Deterministic
None of the mentioned
Explanation:
The output of any information source is random.
Question 5
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 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 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%
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 9
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 10
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.