HDG-4000 HD/SD/DVI COMPONENT VIDEO CALIBRATION GENERATOR USER MANUAL
13
Sync Modes
Standard Sync Modes
Sync pulses are always embedded in the Y signal for YPbPr analog signals. Sync
pulses may also be embedded in the G signal (sync-on-green - SoG) for RGB
signals (3-wire interface), but it is more common for RGB signal interfaces to use
separate H (horizontal) and V (vertical) sync signals (RGBHV 5-wire interface).
The HV sync signals may have either positive or negative pulse polarity. The
HDG-4000 provides a choice of SoG or positive or negative HV sync polarity for
analog RGB signals.
Standard-definition (480i/p and 576i/p) embedded sync is always Bi-Level (a
negative pulse), but high-definition standards specify Tri-Level embedded sync (a
negative pulse followed immediately by a positive pulse). The HDG-4000 always
initializes with those sync modes. However, some older scalers produce Bi-Level
sync when upconverting SD video to HD formats, so Bi-level sync for HD formats
can be selected in the OSD Sync menu.
Automatically Stored Sync Modes
Unfortunately the sync modes used for SD and HD video are different. SD YPbPr
video always uses Bi-Level sync, while HD YPbPr standards specify Tri-level
sync. Another major difference exists between YPbPr and RGB video. While
YPbPr always uses embedded sync, RGB video usually uses separate HV sync.
These differences would normally make it cumbersome to switch back and forth
between SD and HD formats, or YPbPr and RGB output signals while calibrating
a projector.
The HDG-4000 addresses this problem in two ways. First, it always powers up set
to the most common or standard modes. Secondly, it automatically saves and
restores the previous sync modes when switching Format (SD or HD) or Output
signal type (YPbPr or RGB). The default modes are shown below, and in most
cases will not need to be changed.
Initial Sync Modes vs. Output Type & Format
SD (480i/p, 576i/p)
HD (1080i/p, 720p)
YPbPr/YPbPrs
Bi-Level
HV off
Tri-Level
HV off
RGB/RGBs
No embedded sync
Neg HV Sync
No embedded sync
Neg HV Sync
