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Test: VSBSC (Vestigial Sideband Suppress Carrier) - Electronics and Communication Engineering (ECE) MCQ


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10 Questions MCQ Test GATE ECE (Electronics) 2024 Mock Test Series - Test: VSBSC (Vestigial Sideband Suppress Carrier)

Test: VSBSC (Vestigial Sideband Suppress Carrier) for Electronics and Communication Engineering (ECE) 2024 is part of GATE ECE (Electronics) 2024 Mock Test Series preparation. The Test: VSBSC (Vestigial Sideband Suppress Carrier) questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: VSBSC (Vestigial Sideband Suppress Carrier) MCQs are made for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: VSBSC (Vestigial Sideband Suppress Carrier) below.
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Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 1

VSB modulation is termed as ___________.

Detailed Solution for Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 1

VSB (vestigial sideband) transmission transmits one sideband fully and the other sideband partially thus, reducing the bandwidth requirement.

The spectrum of a vestigial sideband is as shown:

Vestigial Sideband Modulation (VSB) is used for video modulation in TV transmission due to the following reasons :

  • Video signal exhibits a large bandwidth and significant low-frequency content which suggests the use of VSB.  
  • VSB (vestigial sideband) transmission transmits one sideband fully and the other sideband partially thus, reducing the bandwidth requirement.
  • The circuitry for demodulation in the receiver should be simple and therefore cheap. VSB demodulation uses simple envelope detection.
Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 2

Which of the following statements are correct w.r.t. the vestigial sideband modulation?
(i) As compared to SSB-SC, the bandwidth of the vestigial sideband becomes larger.
(ii) The filter required needs to have a sharp cut-off.
(iii) The transmitted vestige of the undesired sideband compensates for the loss of the wanted sideband. 
(iv) Vestigial sideband is used in TV for transmission of the picture and sound signals. 

Choose the correct answer from the code given below:

Detailed Solution for Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 2

Concept:

Vestigial Sideband Modulation is a type of amplitude modulation where a part of the signal called vestige is modulated, along with one sideband. The spectrum requirement is between DSB-SC and SSB (less than DSB-SC and more than SSB) (Statement 1 is true)
Vestigial Sideband Modulation (VSB) is used for video modulation in TV transmission due to the following reasons:

  • A workable compromise between the spectrum-conserving characteristics of single-sideband modulation and the demodulation simplicity of double-sideband amplitude modulation is found in the vestigial-sideband modulation.
  • Video signal exhibits a large bandwidth and significant low-frequency content which suggests the use of VSB.  

The spectrum of a vestigial sideband is as shown:

Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 3

A VSB transmitter that transmits 25% of the other sideband along with the wanted sideband radiates 0.625 kW when the modulation percentage is 60%. If we want to transmit the same message by an AM transmitter then the carrier power (in kW) required is 

Detailed Solution for Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 3

Concept:
VSB modulation is the process where a part of a signal called vestige is modulated along with one of the sidebands.
A VSB signal is plotted as shown in the following figure:

A guard band is a very small frequency width used to avoid interference.
The mathematical representation of the VSB wave is:

Vm, q = Quardature component of Vm.
fc = Carrier frequency

Power relation in VSB wave:

F = represents a fraction
K = modulation index


Calculation:
Given that:
PVSB = 0.625, K = 60% = 0.6, F = 25% = 0.25
PC = ?
Then:

Option (2) correct.

Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 4

Vestigial sideband is most commonly used in-

Detailed Solution for Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 4

VSB (vestigial sideband) transmission transmits one sideband fully and the other sideband partially thus, reducing the bandwidth requirement.
Vestigial Sideband Modulation (VSB) is used for video modulation in TV transmission due to the following reasons:

  • Video signal exhibits a large bandwidth and significant low-frequency content which suggests the use of VSB.  
  • VSB (vestigial sideband) transmission transmits one sideband fully and the other sideband partially thus, reducing the bandwidth requirement.
  • The circuitry for demodulation in the receiver should be simple and therefore cheap. VSB demodulation uses simple envelope detection.
     

The spectrum of a vestigial sideband is as shown:

Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 5

The frequency response H(ω) of a VSB filter is shown below.

Find the VSB signal XVSB(t) when m(t) = a1 cos ω1t + a2 cos ω2t

Detailed Solution for Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 5

Concept:
VSB (vestigial sideband) transmission transmits one sideband fully and the other sideband partially thus, reducing the bandwidth requirement.
The spectrum of a vestigial sideband is as shown:

Analysis:
xDSB(t) = m(t) cos ωct
= [a1 cos ω1t + a2 cos ω2t] cos ωct
= a1 cos ω1t cos ωct + a2 cos ω2t cos ωct
= a1/2 [cos (ωc - ω1)t + cos (ωc + ω1)t] + a2/2 [cos (ωc - ω2)t + cos (ωc - ω2)t
so, these are the sinusoids that passes through H(ω) and are having gains
0.25, 0.75, 0, 1
∴ xDSB(t) = (a1/8) cos(ωc - ω1)t + (3a1/8) cos(ωc + ω1)t + 0 + (a2/2) cos(ωc + ω2)t

Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 6

Modulation system used for video modulation in TV transmission is

Detailed Solution for Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 6

In TV Transmission the use of FM is made for Audio transmission and AM for Video transmission.
Vestigial Sideband modulation (VSB) is used for video modulation in TV transmission due to the following reasons :

  • Video signal exhibits a large bandwidth and significant low-frequency content which suggests the use of VSB.  
  • VSB (vestigial side band) transmission transmits one side band fully and the other side band partially thus, reducing the bandwidth requirement.
  • The circuitry for demodulation in the receiver should be simple and therefore cheap. VSB demodulation uses a simple envelope detection.
Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 7

When bandwidth is the major consideration a narrow and wide band FM can be approximated to?

Detailed Solution for Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 7

For narrow and wide bands frequency modulation, modulation index is respectively smaller and greater than 1. When bandwidth is considered it can be approximated to AM.

Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 8

In television transmission, the type of modulation used for video is

Detailed Solution for Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 8

In TV Transmission the use of FM is made for Audio transmission and AM for Video transmission.
Vestigial Sideband Modulation (VSB) is used for video modulation in TV transmission due to the following reasons :

  • Video signal exhibits a large bandwidth and significant low-frequency content which suggests the use of VSB.  
  • VSB (vestigial sideband) transmission transmits one sideband fully and the other sideband partially thus, reducing the bandwidth requirement.
  • The circuitry for demodulation in the receiver should be simple and therefore cheap. VSB demodulation uses simple envelope detection.

The spectrum of a vestigial sideband is as shown:

Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 9

Which modulation is used in microwave band?

Detailed Solution for Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 9

In pulse modulation, message signal in the form of pulses are varied with respect to width, amplitude or position. It is mostly used for radio navigation, microwave band and for many others.

Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 10

Signal to quantization noise ratio in PCM system depends on _________

Detailed Solution for Test: VSBSC (Vestigial Sideband Suppress Carrier) - Question 10

Pulse code modulation (PCM) is a digital form of communication. For demodulation of PCM, it is necessary to convert it into PAM. Quantization noise occurs in PCM only. Signal to quantization noise ratio depends on the number of quantization levels.

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