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ARC130S SECTION
4
ARC130S 060801 Version 1 Issue 1
4.19
Systime
In order to improve the system timing a new mode
has been introduced. This mode ensures that
output line 23 and video index signalling occurs on
the same field that the video transition occurs. It
also ensures that GPI contact closures that are
co-timed with the video, that they wish to change,
are properly timed. In earlier releases the GPI
closure had to be done in advance of the desired
transition.
This new timing model is selected by default with
version A14 and later software. Existing users of
the ARC who wish to upgrade to this version of
software but have an existing remote control
system in place may select the old timing model if
they desire. This ensures compatibility between the
new ARC software and the users existing
infrastructure.
Selections are
CoTimed
(for new model) or
Early
(for old model)
This function may also be entered via RollCall.
The
Trans
menu controls the type of transition
between display sizes that the ARC performs.
Trans – Period
This sets the time that the ARC takes to move
between one picture size and the next when the
ARC is in Slew mode (see below). If Update is set
to F1 and F2 (see Setup- Update menu below)
then the time is in video fields otherwise it is in
Frames. The default period is one field
Trans -- Type
This sets the type of transition that the ARC will
perform.
Trans -- Type -- Slew
In Slew mode the ARC moves gradually from one
picture size to the next taking the time set on the
Trans – Period menu and following the profile set
on the Trans – Profile menu.
Instant
In instant mode the ARC cuts directly from one
picture size to the next. Note that Instant mode is
the same as Slew mode with the duration set to
one field.
Systime
CoTimed/Early
Type
Slew
Instant
Trigger
Profile
Linear
Accel
Decel
S-Curve
Update
C
Trans
Period
Trigger
In Trigger mode, the ARC will slew from one
picture size to the next using the duration and
profile set on the Trans menus. However, the
transition will not be started until a trigger
command is sent on the RS-422 remote control
channel. This is useful when remote controlling the
ARC as the display parameters can be sent in
advance of the transition and, only the trigger
command needs to be sent in real time.
Warning, if the ARC is put in Trigger mode then it
will not react to front panel commands which affect
the picture display parameters (size, aspect, pan
and Pos).
Trans -- Profile
This sets the shape of the transition that the ARC
will perform.
Trans -- Profile -- Linear
In Linear mode the ARC moves linearly from one
picture size to the next.
Accel
In accelerate mode the ARC starts the transition
with a low rate of picture size change from field to
field and gradually increases the rate of change.
Decel
In decelerate mode the ARC starts the transition
with a high rate of picture size change from field to
field and gradually decreases the rate of change.
S-Curve
In S-Curve mode the ARC starts the transition
slowly, then increases the rate of change then
reduces the rate of change at the end of the
transition.