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The Vestigial Side Band (VSB) modulation is preferred in TV systems because 1. It reduces the bandwidth requirement to half 2. It avoids phase distortion at low frequencies Which of the above statements is/are correct?

The Vestigial Side Band (VSB) modulation is preferred in TV systems because 1. It reduces the bandwidth requirement to half 2. It avoids phase distortion at low frequencies Which of the above statements is/are correct? Correct Answer 1 only

Vestigial Side Band (VSB):

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

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:

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