7700 MultiFrame Manual
7736CEM Composite Encoder with Monitoring
Revision 1.5
Page - 21
*Grey background indicates un-implemented or un-tested features
625 PESA line
Sets the line number for decoding PESA format Source ID in PAL/625 line
video.
Default SID mode
Selects whether the
Default SID msg
will be shown when there is no source ID
on the incoming video.
Default SID mode
Sets the message that will be shown when
Default SID mode
is enabled and the
SID window is turned on.
7.5.1. Setting the Video Standard
Video/SID
The video standard is selected with this control.
Warning: If you power up the card in a standard opposite to the standard that
is being applied as the genlock source, the OSD will not be readable to
change the standard. You must remove the genlock signal change the
standard, then re-apply the genlock.
In
Auto
mode, the Genlock reference video standard is used to determine what
standard to use. If Genlock video is not present, the input video standard is
used. PAL-M genlock is not supported;
Auto
mode is not available for PAL-M
operation. If a PAL-M signal is applied, it will be mistaken as NTSC.
Video standard
NTSC/525
PAL-B/625
Auto
PAL-M/525
7.5.2. Selects Input Video Lock Mode
Video/SID
This control configures how the input video locks when upstream video is
switched or disturbed.
Clean
mode will freeze on any H or V mistiming
while
Fast
mode will assume an upstream synchronous switch and not
freeze until the video has been missing for a number of lines.
Lock mode
Clean/
asynchronous,
Fast/
synchronous
Background and further details:
A frame synchronizer has two main features; to re-time a video signal to any arbitrary timing (provided by
the Genlock reference input) and to double buffer the video so that if it goes away, a good “frozen” picture
can be displayed. To display a good picture, the input must be very sensitive to changes or problems so
that the buffered video that is going to be displayed is not overwritten by bad content. Also, when new
video is applied, care must be taken to verify the new video H phase, V phase and standard before “un-
freezing”. For this type of operation, set this control to
Clean
mode.
