Digital Communication Signal Processing Questions and Answers

Digital Communications Questions and Answers – Digital Communication Signal Processing

This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Digital Communication Signal Processing”.

1. What is the ASCII value of space?
a) 32
b) 48
c) 96
d) 65

Explanation: The ASCII value of space is 32 and ASCII value of 0 is 48.

2. Which block or device does the data compression?
a) Channel encoder
b) Source encoder
c) Modulator
d) None of the mentioned

Explanation: The source encoder turns a digital or analogue signal into a binary digit sequence. Source encoding or compression is the term for this technique.

3. What is the code rate?
a) k/n
b) n/k
c) All of the mentioned
d) None of the mentioned

Explanation: The total number of bits in the sequence is n, and k bits are mapped. The code rate is the reciprocal of n/k, which represents the amount of redundancy introduced.

4. Pulse shaping is done by which block or system?
a) Encoder
b) Baseband modulator
c) Pulse code modulator
d) Demodulator

Explanation: The filtering mechanism is used by the pulse code modulator to create pulses that take up more than one bit of time.

5. Equalizer is used for?
a) Filtering
b) Diminish distortion
c) All of the mentioned
d) None of the mentioned

Explanation: Equalizer is used as a filtering option and also diminishes or reduces the distortion.

6. Source coding block is used for?
a) Compressing
b) Digitizing
c) A/D conversion
d) All of the mentioned

Explanation: All of these steps are handled by source encoding, which compresses the signal, digitises it, and converts it from analogue to digital.

7. Which measurement considers phase as an important parameter?
a) Coherent
b) Non-coherent
c) All of the mentioned
d) None of the mentioned

Explanation: Coherent measurement considers phase as an important parameter.

8. The size of the alphabet M in symbol is calculated as?
a) 2(k+1)
b) 2k
c) 2(k-1)
d) 1+2k

Explanation: The size of the alphabet is calculated using 2^k where k is the number of bits in the symbol.

9. How many bytes does a gigabyte have?
a) 1 million bytes
b) 10 million bytes
c) 1 billion bytes
d) 10 billion bytes

Explanation: One gigabyte has 1 billion bytes.

10. Which circuit is called as regenerative repeaters?
a) Analog circuits
b) Digital circuits
c) Amplifiers
d) A/D converters

Explanation: The fundamental benefit of digital communication is that signals may be simply replicated. As a result, regenerative repeaters are the name given to digital circuits.

11. What are the advantages of digital circuits?
a) Less noise
b) Less interference
c) More flexible
d) All of the mentioned

Explanation: Because digital circuits work using digital pulses, they are less susceptible to noise, distortion, and interference, and the pulses may be regenerated.

12. How many different combinations can be made from a n bit value?
a) 2(n+1)
b) 2(n)
c) 2(n)+1
d) None of the mentioned

Explanation: 2(n) different combinations can be made from n bit value. For example, from 2 bit value 22 different combinations-00,01,10,11 can be made.

The use of digital processing, such as by computers or more specialised digital signal processors, to conduct a wide variety of signal processing activities is known as digital signal processing (DSP)…. DSP can be used with both streaming and static (stored) data. The science driving our connected digital lives is communication and signal processing. Signal processing is an enabling technology that comprises information processing’s underlying theory, applications, algorithms, and implementations.

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