Cobalt Digital FUSION 3G 9921-FS 3G_HD_SD Frame Sync - Manual (Page 13)

9921-FS-OM (V1.15) 9921-FS PRODUCT MANUAL 1-9
Introduction
9921-FS Functional Description
Frame Sync Function
This function provides for frame sync control using either one of two external
FRAME REF IN (1,2) reference signals distributed with the card frame, or the
input video as a frame sync reference.
This function also allows horizontal and/or vertical offset to be added
between the output video and the frame sync reference.
Frame sync can select from either of two card frame reference sources, or
free-run input video sync. Selectable failover allows alternate reference
selection should the initial reference source become unavailable or invalid. In
the event of input video loss of signal, the output can be set to disable video,
go to black, go to an internal test signal generator pattern, or freeze to the last
intact frame (last frame having valid SAV and EAV codes).
An internal test signal generator provides a selection of 10 standard patterns
such as color bars, sweep patterns, and other technical patterns. The generator
output can be invoked upon loss of program video input, or applied to the
program video output via user controls.
ARC Processor
(See Figure 1-4.) This function uses extracted Aspect Ratio Control (ARC)
data from the input video (in either AFD, WSS, or VI formats) and provides:
• Format translation between AFD, WSS, and VI ARC formats.
• H/V cross-conversion matrix in which a received code directs a same
or other user-selectable alternate H/V ratio on the output for any of
several H/V ratios.
• (Scaler-equipped card only) Directs scaler automatic active ARC in
response to received and/or converted ARC code (Scaler Follows
ARC).
The input video is checked for ARC formats and can be set to provide a
trigger upon when a selected ARC format is received, the code associated
with the received format can be applied to the output as a translated format
(for, example, from WSS to AFD). Received H/V codes can also be applied
through an H/V conversion matrix that allows alternate H/V ratios for a given
received input code. The ARC code format priority works in that AFD has
highest priority, with WSS or VI selectable as the next priority. In conjunction
with a user-accessible cross-matrix table, the received code then in turn
directs any of several user-selectable H/V settings to be inserted on the output
video as AFD, WSS, and/or VI codes. AFD, WSS and/or VI can be rejected
for input consideration. On cards equipped with a scaler, the selected output
H/V ratio can be set to automatically apply this aspect ratio to the program
video.