Digital Communication Questions and Answers
Q1.
Companding is the process of
Answer :
Compression & Expansion
Q2.
The signals which are obtained by encoding each quantized signal into a digital word is called as
Answer :
PCM signal
Q3.
In PCM the samples are dependent on _____
Answer :
Time
Q4.
The main sources of corruption are
Answer :
Sampling, quantizing and channel effects
Q5.
The reasons for the threshold effect are
Answer :
1. Thermal noise
2. Interference from other users
3. Interference from circuit switching transients
Q6.
The sampling process includes methods such as
Answer :
Sample and hold
Q7.
The effects of aliasing are ___
Answer :
Attenuation and non uniform spectral gain
Q8.
The range of amplitude difference gives the value of
Answer :
Distortion
Q9.
If the filter’s tap weight remains fixed during transmission of data, then the equalization is called as
Answer :
Preset equalization
Q10.
Performance of BFSK signal is _____ than BPSK.
Answer :
3db worse
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