What is a primary application of VSB (Vestigial Sideband) modulation?

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  1. Telephonic communication
  2. Television signal transmission
  3. FM radio broadcasting
  4. Satellite communication

Answer (Detailed Solution Below)

Option 2 : Television signal transmission
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Concept:

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:

JULY 2018 PART 4.docx 26

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