Digital Communication Questions and Answers
Q1.
The output SNR can be made independent of input signal level by using
Answer :
Non uniform quantizer
Q2.
Which type of quantization is most preferable for audio signals for a human ear?
Answer :
Non uniform quantization
Q3.
Choosing a discrete value that is near but not exactly at the analog signal level leads to
Answer :
Quantization error
Q4.
Adaptive DPCM is used to
Answer :
Decrease bandwidth
Q5.
Timing jitter can be reduced by
Answer :
Good power supply isolation & Stable clock reference
Q6.
Signal to noise ratio is infinite when
Answer :
Quantization noise is zero & Number of levels are infinite
Q7.
The process in which the top of each pulse in the output samples retains the shape of the analog segment is called as _____
Answer :
Natural sampling
Q8.
Multiplication of input signal with pulse train is done in _____ sampling.
Answer :
Natural sampling
Q9.
The over-determined set of equations can be solved using
Answer :
Zero forcing & Minimum mean square error
Q10.
For AWGN, the noise variance is
Answer :
N0/2
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