Analog video signals 77
Video timings determine how an analog or digital input signal is organized into
lines, fields and frames, and where the various synchronization signals are placed.
The settings which include: synchronization pulse width, back porch, active
period and front porch. These settings are valid on a line basis (horizontal timings)
or a field/frame basis (vertical timings).
For a typical line, these settings refer to the following:
RY F
INA 05 G
0 B C
D
E
IM 2A
L Y A. Total time for a line in a field/frame (time per line)
B. Horizontal synchronization pulse width
E A C. Horizontal back porch
R M D. Active line time (amount of pixels that contains actual video information)
E. Horizontal front porch
P 19F. Active video amplitude
G. Synchronization pulse amplitude
Video timings and
DCFs
The respective widths of the synchronization pulse, the back porch, the active
video period, and the front porch are known as the video timings of the camera;
these signals describe how to interpret the analog video signal (each of these
