Digital Communications

Quantization

Question 1
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 2
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 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%
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 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%
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 7
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 8
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 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%
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.