Digital Communications

Sampling and Quantization

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Source coding reduces
Redundancy
Average bit rate
Redundancy & Average bit rate
None of the mentioned
Explanation:
Source coding reduces both average bit rate and reduces redundancy.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
In which mixing is easier?
Analog signal
Digital signal
Analog & Digital signal
None of the mentioned
Explanation:
Mixing of digital signals are easier than that of mixing analog signals.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Shot noise occurs in
Transistors
Valves
Transistors & Valves
None of the mentioned
Explanation:
Shot noise occurs in both valves and transistors.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Which requires interpolation filtering?
Up-sampler
D to A converter
Up-sampler & D to A converter
None of the mentioned
Explanation:
Up-sampler and D to A conversion need interpolation filtering.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Which filter does not have sharp output?
Linear phase filter
Delayed symmetric filter
Linear phase & Delayed symmetric filter
None of the mentioned
Explanation:
Linear phase filter or delayed symmetric filter does not have sharp output but sampling can be done in real time.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
A to D conversion process uses
Sampler
Quantizer
Sampler & Quantizer
None of the mentioned
Explanation:
A to D conversion process requires both sampler and quantizer.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
To avoid aliasing
Reduce the bandwidth
Cut out high frequency
Reduce the bandwidth & Cut out high frequency
None of the mentioned
Explanation:
To avoid aliasing bandwidth should be reduced and high frequency should be cut out.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Decreasing the data rate is called as
Aliasing
Down sampling
Up sampling
None of the mentioned
Explanation:
Decreasing the data rate is called as down sampling and increasing the data rate is called as up sampling.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Non uniform quantization includes
Compression
Expansion
Compression & Expansion
None of the mentioned
Explanation:
Compression and expansion give the feature of non uniform quantization.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
The signal can be reconstructed
At Nyquist rate
Above Nyquist rate
At & above the Nyquist rate
None of the mentioned
Explanation:
The signal can be reconstructed from the sampled version at or above Nyquist rate using simple low pass filtering.