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COLOR SIGNAL TRANSMISSION
The color video signal contains two independent information, that of hue and saturation. It is a difficult matter to modulate them to one and the same carrier in such a way that these can be easily recovered at the receiver without affecting each other.
The problem is accentuated by the need to fit this color signal into a standard TV channel which is almost fully occupied by the ‘Y’ signal. However, to satisfy compatibility requirements the problem has been ingeniously solved by combining the color information into a single variable and by employing what is known as frequency interleaving.
(In the CCIR PAL I standards the picture and sound carrier are 6 MHz apart and the channel bandwidth is 8 MHz. The only difference between PAL-B and PAL-G is in the channel bandwidth)
PAL-B with channel bandwidth of 7 MHz does not provide any inter-channel gap, whereas PAL-G with channel bandwidth of 8 MHz provides a band gap of 1 MHz in-between successive channels.
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