Cobalt Digital COMPASS 9034 Input Processing Analog to Digital Video - Manual (Page 11)

9034-OM (V4.1) 9034 PRODUCT MANUAL 1-7
Introduction
9034 Functional Description
Video Processor Description
Video Processor
The 9034 provides full color processing control (luma gain and lift, chroma
saturation, and color phase) of the output video.
Frame Sync Function
This function provides for frame sync control using either one of two external
EXT REF IN (1,2) reference signals distributed with the card frame, or the input
video as a frame sync reference.
This function allows horizontal and/or vertical offset to be added between the
output video and the frame sync reference.
A video/audio delay offset function allows adding or reducing audio delay
from the matching video delay. This function is useful for correcting lip sync
problems when video and audio paths in the chain experience differing
overall delays. A Reset Framesync function resets the frame sync following
any horizontal or vertical offset changes, clearing any buffered audio and
video and re-establishing the frame sync. The 9034 re-establishes video/audio
sync following framesync changes by applying an offset in small, progressive
amounts to provide a seamless, glitch-free retiming. A user-selectable hard
resync function allows setting a threshold at which hard resync is applied if
audio-video offset exceeds the threshold. Hard resync provides fastest
snyc-up suitable for off-air manipulation. Conversely, a threshold setting that
avoids hard resync allows glitch-free on-air manipulation.
In the event of input video loss of signal, this function provides for disabling
the video, going to a desired color raster, or freezing to the last intact frame.
(9034-DEC only) When Dolby ® data is received and actively routed into
embedded or AES output channels, the frame sync function delays the video
by one frame (as required by the Dolby
® decode processing delay) to
maintain video/audio sync.
AFD Inserter
This function provides for assignment and insertion of AFD codes into the
SDI output video. Using this function, AFD codes in accordance with the
standard 4-bit AFD code designations can be applied to the output video.
When used in conjunction with a separate downstream card capable of
providing AFD-directed scaling, the image can in turn be scaled in
accordance with the AFD coding embedded by this card.
The function also allows the selection/changing of the AFD code and
ancillary data line number for the outputted AFD code.