User manual

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.
3.9.4. 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 latter 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.
3.9.5. 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-792 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.
3.9.6. Menu Settings
This menu provides items to change the menu position and menu display time, the time after which the
OSD is switched off again with no user interaction. OSD Messages can be activated and deactivated.
The menu language can be altered and the keypad can be locked. To unlock the keypad a combination
of keys has to be pressed at the same time. The locking of the keyboard is accompanied by the
message: Keypad is locked. Press Up and Down to unlock. When successfully unlocking the keypad
the message shows up: Keypad unlocked.
3.9.7. Network Settings
The Network Settings menu allows to configure the VP-792 TCP/IP address for communication with the
warp generator PC tool. Under Address Type a static or DHCP leased address can be chosen. The
static address and Netmask need to be entered manually.
The Network Settings menu has a section with information on the DHCP Status and IP address
assigned to the board, as well as the fixed MAC Address programmed into the VP-792. The DHCP
status is OFF when static assignment is used or it displays an address when DHCP has leased an
address accordingly or it is None assigned if the lease was not successful.
Note: When changing from DHCP to Static mode or vice versa it is strongly recommended that VP-792
is powered down after such a change, then powered back up, so that it is properly recognised by other
devices on the network.