ABSTRACT
It is the various different methods used to modulate the subcarrier with the chrominance signals that differentiate between the three variants, NTSC, PAL and SECAM.
Baseband spectrum
We saw in the last chapter how it proved possible to add the colour information to a subcarrier within the normal bandwidth of the television channel and to include this information in the gaps in the energy spectrum of the black-and-white picture signal. In terms of the baseband frequency spectrum such an arrangement can be displayed as shown in figure 11.
