GRASS VALLEY KARRERA K-FRAME, Installation & Service Manual, Page: 188 / 278

188 KARRERA K-FRAME — Installation & Service Manual
Section 5 — Basic Configuration
Other Settings
Matte Limiting
Matte Limiting determines how the matte generators produce colors.
Limits can be imposed to prevent downstream signal problems.
None
– In this mode, no limiting is imposed. Analog signal paths and mon-
itors may behave poorly to some colors produced in this mode.
Decodable
– This limiter mode produces colors that decode to valid RGB
components. Not all valid RGB colors can be transmitted in NTSC, how-
ever. Saturated colors near yellow and cyan over modulate an NTSC trans-
mitter.
Transmittable
– This limiter mode prevents over modulating an NTSC trans-
mitter, but can produce colors which can not be decoded into RGB. For
example, a 0% luminance blue produces negative green and red compo-
nents.
Both
– This limiter mode is similar to
Decodable
, except that maximum levels
are reduced slightly around yellow and cyan to prevent over modulating
an NTSC transmitter.
Command Processing
These controls determine when commands (like source selections or the
initiation of mixes or wipes) will be enacted by the Karrera K-Frame system
(also known as field dominance). These controls can be useful for consis-
tent match frame editing.
Any Field
– The action will occur at the start of the next field, either even or
odd. Use this setting if you are not going to edit the video output and want
the fastest response.
Even Field
– The action will always occur at the start of the next even field.
This is probably only appropriate if your edit controller is set to edit in the
middle of a frame.
Odd Field
– The action will always occur at the start of the next odd field. This
is the normal setting for almost all conditions, especially when the video
output will be edited, and is compatible with most video editing systems
that use the frame boundary for edits. This setting is essential, however,
when controlling external devices like DDRs that execute commands only
at the beginning of the frame.
Output Blanking
Production switchers normally regenerate a clean blanking interval. When
the switcher must pass ancillary information such as embedded audio, this