Digital video signals 87
Digital video signals
Digital composite video is essentially the same waveform as the analog composite
RS-170 video signal, except that instead of varying voltages on one signal line, the
values are represented as digitized values carried on multiple signal, and the
data-carrying signals are restricted to one of two voltage levels: logic 1 or 0.
Y horizontal sync
R front porch
back porch
INA 05 line0
line 1
analog composite video
0horizontal sync (separate)
IM 2pixeldata
(all bits represented
in a single line)
digital
video
L Y Representing data in digital form is useful since the waveform can be regenerated
PRE19 MA with minimum noise and distortion as it is being transferred.
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