Grass Valley 2200 - Manual (Page 94)

5-4
Section 5 Ñ Digital Effects Interface
Effect Send and Control Delays
The effect send and control delays are adjustable in the CONFIG/EXT IF/DPM
SETUP menu.
The control delay compensates for the time it takes for the DPM to respond to
effect recall and effect position commands.
The best way to assess the control delay is to build a combined effect of the
switcher and DPM, for example, and run them together while recording on a
machine. The DPM setup control delay can be adjusted to provide the correct
timing, and stored in the ConÞguration Þle.
The effect send delay compensates for the time it takes the DPM to respond to a
channel in video input. Essentially, this is the video delay through the DPM,
typically 2 Þelds. When an effects send is activated, the video to the DPM is
switched immediately. To avoid a ßash at the output of the mix/effect bank, the
M/E canÕt begin using the DPMÕs signal until the newly selected video has had
time to arrive at the DPM output. The effect send delay should be adjusted so that
going into effects send is clean at the output of the mix/effects bank involved in
the effects send. The proper setting is the minimum setting which does not result
in a ßash. Too long a delay will not be noticed, but will increase the time it takes
for the M/E to actually switch to the DPM video.
Once the delay values have been determined, they should be published in the
DPMÕs conÞguration documentation. The user may simply set the delays to those
values.
Switcher Software
Switcher must be running standard software version 5.2 or later in order for the
interface to function as described in this document.
DPM Enables
The switcher provices a selection for disabling the DPM interface. The DPM
button in the EXTERNAL INTERFACE section of the control panel must be lit in
order for the switcher to communicate with the DPM.