Page 282 - Satellite Communications, Fourth Edition

262 Chapter Nine

Figure 9.7 shows in block schematic form the NTSC system. The TV
camera contains three separate camera tubes, one for each of the colors
red, blue, and green. It is known that colored light can be synthesized
by additive mixing of red, blue, and green light beams, these being the
three primary light beam colors. For example, yellow is obtained by
adding red and green light. (This process must be distinguished from
the subtractive process of paint pigments, in which the primary pigment
colors are red, blue, and yellow.)

Figure 9.7 Generation of NTSC color TV signal. Matrix M converts the three color sig-
nals into the luminance and chrominance signals.