Which type of modulation is used in TV transmission?
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Answer Posted / sachin dohre
IN TV signal Transmission a technique is employed called
as vestigal sideband technique.
Such technique limits the band to 7mhz per television
channel that could be 11.25mhz since video info. has 5mhz
band and requires 5 x 2= 10mhz + .5(freqency rolloff
response of filter per side band,here usb) + .5 (lsb) + .25
(guard band for sound carrier) = 11.25 mhz for its
transmission. Since usb and lsb are replica of each other
having same variation in their band with the change in
modulating video signal we could remove one of the band
partially. This partial removal technique is what we
called vestigal sideband technique (VSB)
thank you!!
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