Digital Communication Questions and Answers
Q1.
The distribution function of -(infinity) and (infinity) is ___
Answer :
0 and 1
Q2.
For a stationary process, autocorrelation function depends on
Answer :
Time difference
Q3.
Power spectral density function is a?
Answer :
1. Real and even function
2. Non negative function
3. Periodic
Q4.
According to Parseval’s theorem the energy spectral density curve is equal to?
Answer :
Area under square of the magnitude of the signal
Q5.
Autocorrelation function of periodic signal is equal to _____
Answer :
Power of the signal
Q6.
Which signal is said to be power signal?
Answer :
Finite power and infinite energy
Q7.
What are the advantages of digital circuits?
Answer :
1. Less noise
2. Less interference
3. More flexible
Q8.
Pulse shaping is done by which block or system?
Answer :
Pulse code modulator
Q9.
Using ARMA filter
Answer :
Gives sharp output
Q10.
Which process requires low pass filter?
Answer :
Up-sampling & Down-sampling
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