For 3GSDI you can choose between LevelA and Level B type input modes.
SDI audio input is routed to the HDMI and 3GSDI output connector by default. VP-794 can also be set to
monitor audio on the SPDIF connector.
SDI Audio on the HDMI and 3GSDI connector and SPDIF connector are mutually exclusive.
Two consecutive SDI audio channels can be output on the HDMI and 3GSDI output interface. The
group can be chosen. Or all eight SDI audio channels can be transmitted.
Component Setup:
The component interface of the VP-794 is configured through this submenu. The Color Space can be
set to YPbPr or RGB. The sync signal can be stripped from the Green or Y channel with the setting 3
Wire or from the separate sync line with the setting 4 Wire. The Auto setting will automatically detect a
sync signal and set-up the VP-794 accordingly. This is set in under Synchronisation.
Test Pattern:
When the OSD menu is OFF the test pattern can be toggled through by rotating the menu dial. For unit
control through a Web browser or to set up a certain default test pattern use the input configuration
menu.
Custom test patterns loaded into the file system of the unit through the Web interface, can be accessed
through the same means.
Instead of custom test patterns also a screen grab of the current video can be stored in one of the four
slots provided for custom test patterns.
The speed of the moving cross test pattern can be changed. Also, the foreground and background color
and the line width of the moving cross test pattern can be changed in this menu.
Note: Most test patterns are scaled in multiple unit configurations with Autozoom enabled since they are
useful for setting up the blend and warp of the system. The SMPTE, and Pluge Patterns are not scaled.
Switching Transition:
When switching input channels by default the last frame of the prior displayed image is frozen and
displayed until a stable image of the new input channel can be shown. The switchover process is
supposed to be as seamless as possible. The source and monitor add switching noise due to
unforeseeable activity of the firmware in said devices.
By default VP-794 is in auto frame rate switching and I/O lock mode. In these modes the output of the
scaler is forced to adopt the sync timings of the input signal
In order to get a best smooth switching result between unlocked sources, the source and
monitor I/O lock and auto frame rate switching have to be switched OFF
in the Output/Display
Type menu. This allows the scaler to provide a constant output determined by its own in built clocks.
The switching transition of VP-794 can be set to Freeze, Blank, Fast Fade and Slow Fade. Freeze halts
the prior channel image until the new channel image is stable. Blank switches the output to show a
black screen instead of the last channel image. Fast and slow fade have the prior channel image faded
out and fade into the new channel video image once it is stable.
3.14.4.
Display Mode
The “Display Mode” can be set to either Low Latency or Best Picture.
In Best Picture optimum image processing is applied, whereas in Low Latency mode the lowest latency
is achieved. The flicker of interlaced video is not suppressed totally for the Low Latency setting. Thus it
has the disadvantage of conventional CRT TVs, but also their advantage of almost no delay in
response, which is important for applications such as gaming, simulation or imaging in medical
treatment.
The latency of the system is ¼ of a frame for progressive input and progressive output when I/O locked.
If the output is free running the latency is oscillating between ¼ of a frame and 1 frame. Switching ON
PTZ adds one frame of latency. Switching ON warp adds another frame of latency. If an interlaced video
signal is processed in Best Picture mode, this will add one more field of latency. In Low Latency mode
this extra field of latency is avoided.
