3025SW Master Control Switching & Channel Branding
Revision 1.0 Page 65
4.8.2.8. Auto Toggle
This setting forces the M2100 control of the 3025SW to be toggled with the Emergency enable/disable.
4.8.2.9. Hold on Transition
When checked, Emergency will stay on-air regardless of transitions. If disabled, Emergency will go off-
air with the next transition.
4.8.2.10. Force VOs off
This option allows for the VOs to be turned OFF when the Emergency Mode is turned ON.
4.8.3. Key Signal Settings
4.8.3.1. Gain
This control is the equivalent to the softness level in an analogue keyer. The edit box sets the amount
of gain applied to the key signal of this keyer. It is nominally set to a value of 75 (34%) for a key signal
in the range 16-235. This setting should be set according to the key signal range.
75 for range 16-235
65 for range 1-254
It should always be in the range of 16 - 235.
4.8.3.2. Clip (Offset)
This control is the equivalent to the clip level in an analogue keyer. The edit box sets the midpoint of
the key signal for this keyer. This value is the default value set for the EMC and is used after a power
cycle or re-configuration; the user can optionally change this value via the control panel. This control is
expressed as an 8 bit digital video value (between 16 and 235). It is nominally set to a value of 125
(50%) for a non-inverted key signal in the range 16-235. This setting should be set according to the
key signal range and inverting state.
125 for range 16-235 non-inverted
131 for range 16-235 inverted
127 for range 1-254 non-inverted
129 for range 1-254 inverted
It should always be in the range of 16 - 235.
4.8.3.3. Additive / Multiplicative Mode
This keyer can either operate in an additive mode or in a multiplicative mode. Note for additive keying
the foreground signal is not multiplied by the key. Thus care is needed to ensure that the fill signal is
black outside the area intended to be keyed. If this condition is met then additive keying will normally
give better results, especially from artifacts around the edges.
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