MICROTRONIX DX-2200-SW-02, User Manual

Page: 21 / 87

DX-2200
– Dual-view 2x1 SDI Video Switcher
Page 21 of 87
The DX-2200 provides Wipe effects in 4 directions and a fade effect. The rate of
change for the Wipe effect is programmable in units of pixels per frame with the
‘TPI’ or ‘TSI’ command. The rate of change for the fade is programmable in units
of alpha per frame by using the ‘TPA’ or ‘TSA’ command. After the Transition
Effect completes, the Alpha blending value for the input is changed to a new
value.
NOTE: If other commands that change the alpha of the transitioning input are
executed during a Transition Effect, they won’t be applied until the
transition completes.
The Horizontal Alpha Split and Vertical Alpha Split modes do not automatically
move the transition point. They operate continuously until disabled by the
‘TP0’ or
‘TS0’ command, or by selecting a different Alpha Blending Effect. For each video
frame, the initial alpha value is applied to the pixels before the transition row or
column. For pixels after the transition poi
nt, a second alpha is applied. The ‘TPS’
or
‘TSS’ command sets the transition point to a specific row or column position.
The row or column refers to a position within the output video window that the
effect is applied to. For example if Input 1 is displayed in a 640x360 pixel window,
then the range of transition points for the vertical split can be set at positions from
0 to 639 pixels, regardless of the output video format or the location of the
640x360 pixel window in the video. Unlike the Transition Effects, the Alpha Split
modes do not permanently change the alpha of the input.
For all Alpha Blending Effects, the default alpha after the transition is the inverse
of the initial value; A fully visible layer changes to fully transparent and vice-versa.
NOTE: If the initial alpha is set for half visibility, the transition effects will change
from half visibility to the inverse, also half visibility, and no change will be
visible on the output.
The ‘TPB’ or ‘TSB’ command can be used to set a specific alpha value to be used
after the transition instead of the default alpha. If the alpha set in the command is
the same as the initial alpha, then no change will be visible at the output.
Table 6: Alpha Blended Overlay Transition Effects
Command
Code
Mode of Operation
Transition Effect Commands
TP0
Non-selected Layer: Complete any transition effect
immediately or exit from the Alpha Split Modes
TP1 Non-selected Layer: Wipe from Top to Bottom
TP2 Non-selected Layer: Wipe from Bottom to Top
TP3 Non-selected Layer: Wipe from Right to Left
TP4 Non-selected Layer: Wipe from Left to Right
TP5 Non-selected Layer: Fade
TP6 Non-selected Layer: Horizontal Alpha Split
TP7 Non-selected Layer: Vertical Alpha Split