Digital Communication Questions and Answers
Q1.
Original signal came to be retraced from sampled version using
Answer :
Low pass filtering
Q2.
Shot noise occurs in
Answer :
Transistors & Valves
Q3.
Different cases of sampling include
Answer :
1. Ideal impulse sampling
2. Flat-topped sampling
3. Sampling with rectangular pulses
Q4.
In duobinary signalling method, for M-ary transmission, the number of output obtained is
Answer :
2M-1
Q5.
In polybinary signalling method the present bit of binary sequence is algebraically added with ___ number of previous bits.
Answer :
j-2
Q6.
Which binary waveform uses three levels?
Answer :
1. Bipolar RZ
2. RZ-AMI
3. Bipolar RZ & RZ-AMI
Q7.
In pulse modulation, reciprocal of T(time) is
Answer :
Symbol rate
Q8.
For both PPM and PDM ____ is kept constant.
Answer :
Amplitude
Q9.
Which method is called as differential encoding?
Answer :
NRZ-M
Q10.
In which waveform logic 1 is represented by half bit wide pulse and logic 0 is represented by absence of pulse?
Answer :
Unipolar RZ
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