HDG-4000 ANALOG/DIGITAL VIDEO CALIBRATION GENERATOR SERIAL INTERFACE MANUAL
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Analog Embedded Sync & HV Sync Modes
The analog embedded Sync (BiLevel, TriLevel, or None) and HV sync (Pos, Neg,
or None) states are stored and automatically recalled when changing the Output
or Format modes. This is necessary because certain sync modes are required by
some video standards, but prohibited by others. For instance, embedded Bi-Level
sync is always required for the 480i or 480p formats when using YPbPr or YPbPrs
output modes, but embedded Bi-Level sync is not required for RGB or RGBs
output modes. Tri-Level sync is never permitted for 480i or 480p formats.
Hence, to conform to the various video standards, the sync modes must follow
several rules when the Format mode is changed between HD (720p/1080i/1080p)
and SD (480i/480p/576i/576p), or the Output mode is changed between
RGB/RGBs and YPbPr/YPbPrs. The generator stores 4 states for the (embedded)
Sync mode, and 4 states for the analog HV Sync mode, which each depend on
the current Output and Format modes.
Sync_Mode [Output] [Format] = Bi-Level, Tri-Level or None
HV_Mode [Output] [Format] = Pos, Neg or SoG (None)
where Output = YPbPr/YPbPrs or RGB/RGBs
Format = HD or SD
The HDG-4000 will recall the previous Embedded Sync and HV Sync states when
changing Format or Output, or you can send new Embedded Sync and HV Sync
modes
after
changing Format and/or Output. But don’t send a new Embedded
Sync or HV Sync mode
before
sending a new Format or Output mode, because
the Sync mode may be changed when the previous states are recalled.
Automatically Recalled
Sync States
Send Sync Commands
After Format or Output
Commands
