
NTSC
Y'IQ
system
30
See
Notch .filtering,
on page 349.
In the NTSC studio, 5.5 MHz of composite bandwidth is
available; wideband chroma of about 1.3 MHz can be
easily maintained. However, only 4.2 MHz of composite
bandwidth is available for NTSC broadcast. If equiband
U and V components are modulated onto a 3.58/WHz
color subcarrier, only 600 kHz of chroma bandwidth is
achieved. The designers of NTSC considered 600 kHz of
chroma bandwidth to be insufficient, and they devised
a scheme to form modulated chroma from / and Q
components, where Q was bandlimited to about
600 kHz, but where / preserves ...