User manual

3.10.3. Input Config
Inputs can be configured through the following sub-menus:
VGA Setup:
Submenu for adjusting analog computer video. A button for automatic setup of frequency and phase of
the sampling clock is provided. This automatic adjustment is strongly recommended. Frequency (Clock)
and phase can also be altered manually.
DVI/HDMI Setup:
The DVI-I connector will accept either DVI-D or VGA analog inputs. The DVI-I channel can be
configured for either.
The equalisation of the DVI interface can be boosted to allow for extended cable length.
The automatic HDMI and DVI Color Space and Range settings can be overwritten in this menu. Range
can be set to limited video mode or full range. The color space can be set to RGB or YCbCr.
The DDC can be taken off line. When setting HDCP Input to off VP-793 pretends to be non HDCP
compliant forcing the source to not encrypt data which is not copy protected.
Test Pattern:
When the OSD menu is off the test pattern can be toggled through by pressing the up or down keys of
the keypad. 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.
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-793 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-793 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.
3.10.4. Display Mode
The “Display Mode” can be set to either Low Latency or Best Picture. In Best Picture optimum image
processing is applied, in Low Latency mode the lowest latency is achieved. The flicker of interlaced
video is not suppressed totally for the Low Latency setting, 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.