8–25
TV Trigger A special kind of Edge-Qualified Trigger, TV Trigger allows
stable triggering on standard or user-defined composite video
signals, on a specific line of a given field. Applications can be
found wherever TV signals are present. And TV Trigger can be
used on PAL, SECAM or NTSC systems.
A composite video signal on the trigger input is analyzed to
provide a signal for the beginning of the chosen field — “any”,
“odd” or “even” — and for a signal at the beginning of each line.
The field signal provides the starting transition, and the
beginnings of line pulses are counted to allow the final trigger on
the chosen line.
Each field, the number of fields, the field rate, interlace factor,
and number of lines per picture must be specified — although
there are standard settings for the most common types of TV
signals. TV Trigger can also function in a simple any-line mode.
Figure 8–19. TV Trigger Menus (see page 8–34 )
TV
TV signal on
# of fields
TV type Standard | Custom
1|2|4|8
1|2|3|4|Ext|Ext 10
as: 625/50/2:1| 525/60/2:1
(Standard)
as: Line| Hz | Interlacing
1 to 1500| 50/60 | 1:1/2:1/
4:1/8:1/
(Custom)
Trigger on Line | Field
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