Sierra Video UPC-166 - Manual (Page 11)

Introduction UPC-166 Functional Description
Video Processor Description
The UPC-166 features a scaler that provides up-conversion using de-
interlacing and motion adaptation for high quality up-conversions. The
scaler also provides user-adjustable aspect ratio control and zoom control.
The UPC-166 video subsystem also provides the functions described
below.
Video Processor
The UPC-166 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 also 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 UPC-166 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 a selectable 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
(for SDI, last frame having valid SAV and EAV codes; for analog, last frame
free of timing errors).
1-7 UPC-166-OM
(V4.0)