Answer Posted / mahesh bhosale

In TV Transmission the use of FM is made for Audio
transmission and AM for Video transmission.
Vestigial Sideband modulation (VSB) is used for the
following reasons :
1. Video signal exhibits a large bandwidth and significant
low-frequency content which
suggests the use of VSB
2. The circuitry for demodulation in the receiver should be
simple and therefore cheap.
VSB demodulation uses a simple envelope detection.
But the practical TV signals are not exactly VSB modulated
due to the following
reasons :
I) The power at the transmitter is very high and it would
be expensive to rigidly control the
filtering of sidebands. Instead, a VSB filter is inserted
in the receiver where the powers are
low.

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