AccuPel HDG-4000 Manual da interface série - Página 6

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HDG-4000 ANALOG/DIGITAL VIDEO CALIBRATION GENERATOR

Automatically Recalled

Sync States

Send Sync Commands

After Format or Output

Commands

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]

where

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.

= Pos, Neg or SoG (None)

Output = YPbPr/YPbPrs or RGB/RGBs

Format = HD or SD

SERIAL INTERFACE MANUAL