Vestigial SideBand Amplitude Modulation (VSB) & Demodulation

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Vestigial SideBand Amplitude Modulation (VSB) & Demodulation:

Why VSB?
  • In DSB-FC Method, wastage of transmitted power and Bandwidth
  • In DSB-SC Method, the same information is transmitted twice in both the sidebands
  • In SSB-SC Method, the loss of desired sideband is the major drawback.
In order to overcome the above drawbacks, the Vestigial Sideband Modulation method is introduced.

Vestigial Sideband Modulation - Definition:
  • One of the sidebands is partially suppressed and vestige (part) of the other sideband is transmitted.
  • The transmitted vestige of the undesired sideband compensates the loss of the desired sideband
  • This is called VSB Modulation
Advantages:
  • Low Frequencies near carrier frequency are transmitted without any loss.
  • Bandwidth is less compared with DSB
  • No need of sharp cut-off frequency required
  • To compensate the loss of desired signal in SSB
Disadvantages:
  • Demodulation process is a complex one.
Applications:
  • It is mainly used for TV signal transmission
  • Transmission of Picture signals

Youtube video for this lecture is available: https://www.youtube.com/watch?v=7IUJly1V8CY


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