Grass Valley PDR 200 Service Manual - Manual (Page 49)

Mix Effects
PDR200 Service Manual 3-17
Mix Effects
The Mix Effects board is a 7-inch high EISA compatible board that operates on the
system’s internal digital component video (CCIR 601). The board contains six video
inputs (two used as keys) and two video outputs. All video inputs and outputs are
connected to the system video crosspoints via a motherboard DIN connector.
The primary functions of the Mix Effects board combine videos or transitions
between videos. The effects may be under control of an EISA bus master (the i960
cpu), on-board pattern generators, or keys. The transitions supported include fades,
dissolves, cuts, push-on/push-offs, push-overs, and the standard family of video
switcher wipe patterns (horizontal wipes, vertical wipes, diamond wipes, etc.).
The Mix Effects board contains two separate mixers. Each of the two mixers has two
source videos, one key video, and one output video. The mixers may be used as two
separate two-video one-key mixers, or may be stacked up and used as a single
three-video two-key mixer.
Two Mix Effects boards may be installed in a system to provide four separate two-in
one-out mixers, or flexible layering of up to five videos.
Note that the Mix Effects board may only be installed in slot 6 or 7. If a Mix Effects
board is installed in slot 6, no video output board may be installed in slot 5; if a Mix
Effects board is installed in slot 7 no video output board may be installed in slot 8.
These restrictions exist because the Mix Effects board shares Video Router
connections between slots 6 and 5, and between slots 7 and 8. Other boards such as
the Audio Input/Output or the Analog Composite Input can be installed next to the
Mix Effects board.
The following summarizes the hardware capabilities of the Mix Effects board.
• Four video and two key inputs (via DIN connector).
• Two video outputs (via DIN connector).
• Processor-controlled mixes (full raster dissolves, etc.).
• Pattern generator-controlled mixes with optional borders of variable color, width,
opacity, and edge softness.
• Key-controlled layering (hole-cutter and fill capabilities) based on the luminance
data of the incoming key video.
• Key inversion (background/foreground swaps).
• Self-keys (luminance).
• Multiplicative or additive mixing of the videos (additive for when foreground is
pre-shaped).
• Replacement of any input video with a processor-selected matte.
• Fades to/from matte (typically black) downstream of the layering.
• Push ON/OFF Effects with optional borders.
• Push OVER effects with optional borders and/or drop shadows.
• Blanking processor at the outputs with ability to blank all vertical interval lines or
to pass active portion of lines that may contain VITS or VITC (no ability to pass
ancillary data in horizontal blanking).