Cobalt Digital COMPASS 9082 HD_SD Frame Sync - Manual (Page 11)

9082-OM (V4.4) 9082 PRODUCT MANUAL 1-7
Introduction
9082 Functional Description
Video Processor Description
Video Processor
The 9082 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 delay offset function
allows adding or reducing 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
video and re-establishing the frame sync. The 9082 re-establishes video sync
following framesync changes by applying an offset in small, progressive
amounts to provide a seamless, glitch-free retiming.
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
(frame having valid SAV and EAV codes).
Note: Although the 9082 passes all four groups of embedded audio, the 9082 frame
sync function is not ideally suited for streams carrying audio because the
9082 does not have tracking embedded audio delay found on our cards spe-
cifically designed for video/audio framesync (such as the Compass
®
9081 or
9083 models). If the 9082 is used to carry audio, noticeable audio glitches
may occur when processing asynchronous inputs.
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.
This function checks for any existing AFD code within the received video
input. If a code is present, the code is displayed. 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.