Answer to Question #278295 in Electric Circuits for micky2

Question

In Amplitude modulation, Vestigal Side Band (VSB) is one of the technique used to overcome its limitations in terms of power and bandwidth. With this in mind; a. Explain how a VSB signal is generated in the transmitter. b. Draw and compare the frequency spectrum of the original message signal and the spectrum of the VSB signal in a frequency domain. c. Show how the bandwidth of VSB is calculated by writing the equation. d. Give one application of VSB in broadcasting.

Answer 1

(a)

A DSB- SC signal is generated first and then passed through a sideband filter

The filter pass the wanted sideband as it is along with a part of unwanted sideband ( Vestige)

(b)

A long with the upper sideband, a part of the lower sideband is also being transmitted in VSB modulation.

(c)

The bandwith of the Vestigial sideband is given by

$BW=fm+fv$

Where $fm=$ Message bandwith

$fv=$ width of the vestigial sideband

(d)

The most prominent and standard application of VSB is for the transmission of television signal

In TV signals there is need of simultaneous transmission of both audio and Video information. VSB technique ensures convenient and efficient usage of bandwith.