Crystal Vision
Introduction
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26/01/06
Audio follow pulse
There is also a positive going external TTL level audio follow video (AFV) pulse output,
the duration of which reflects the current video delay. The AFV output can be used with
external audio delay processors such as the TAD202 if required.
Analogue video formats
The composite video input may be selected to be composite or YC PAL/NTSC or
525/625-line component YUV. Input standard selection is automatic and will follow the
input video. Data in the VBI (vertical blanking interval) of the analogue composite input
can be blanked or passed. NTSC- J and NTSC-M with or without 7.5% IRE setup is also
selectable when receiving an NTSC format video input. Betacam input levels are also
accepted.
Freezing the picture
The default picture freeze is Field 1. An active front panel or Statesman PC control
system will allow Frame, Field 1 or Field 2 to be selected. This is useful if there is
movement between both fields as a frame freeze may show movement judder. Field
freeze will remove judder by repeating the same field to produce a synthetic frame of
video, without movement judder. However a field freeze is more likely to show jagged
edges on near horizontal lines.
Video Input loss behaviour
The ADDEC-200 output will cut to blue immediately on loss of input video.
Status and control
Status and control of the ADDEC-200 is available using the board edge menu selection
switches and LEDs. Full function control and status reporting is also available from either
an active frame front or remote active control panel. PC control is also available using
Crystal Visions Statesman PC controller package.
Note. When the ADDEC-200 is set to remote control mode the position of the board edge
switches may not reflect the actual configuration of the card. Returning the card to local
control will reinsert the board edge configuration
