MICROTRONIX DX-2200, Руководство пользователя

Страница: 18 / 103

DX-2200
– SD/HD-SDI Text & Graphics Inserter – User Manual
Page 18 of 103
4.3 Video Format
The default video format is 720p @ 60 fps. If no input signal is connected at power-up (when operating in the
factory default configuration) the DX-2200-TI will output a black screen. The Text Overlay can be used
without input video connected.
When an SDI input with one of the supported video formats is connected, the unit will detect the video format
and switch the output to the match the detected video and attempt to lock to the clock frequency of the video
input. The video output will momentarily switch off as the video output is adjusted to match the format and
clock frequency of the input. When the clock frequency is locked, the video path is enabled and the input
video and ancillary data will appear at the output.
If the SDI input is disconnected, the unit continues to output in the last video format that was detected.
The default output video format can be changed by saving the configuration when the unit is operating with
the desired output format.
4.4 Picture-in-Picture (PiP)
Units equipped with the optional second SDI input connector (Input 2) are capable of PiP display using the
second SDI Input as the PiP source. The PiP video source can be asynchronous to the main video input or
can be a different resolution / frame rate. If the main input is an interlaced format, the PiP input must be
interlaced, and if the main input is a progressive format, the PiP input must be progressive. The size and
position of the PiP is programmable by software commands.
The PiP input will only function after the background video has been connected to Input 1. The PiP input
does not support audio or other ancillary data types. For interlaced formats, connection of a signal to the PiP
input may create an output video glitch as the unit synchronizes to the input.
4.5 Video Buffering and Frame Delay
For Text Inserter Mode (Mode 1) and Text Inserter with PiP (Mode 2), the DX-2200-TI includes a frame
buffer with a delay of 1 frame. The main video path has an additional delay of approximately 2000 clocks
(about 1 line in 1920x1080 video resolutions). The optional PiP video path has an additional delay that may
vary from 0 to 1 frame due to its support for asynchronous video inputs.
For Text Inserter with Scaling Mode (Mode 3), the DX-2200-TI has 2 frames of delay plus an additional delay
of approximately 4 lines.
4.6 Audio and Ancillary Data
The DX-2200-TI preserves ancillary data in the main SDI Input (Input 1) and passes it through to the output
to provide pass-through of audio, closed captions, and other ancillary data types embedded in the SDI video.
The optional PiP SDI Input (Input 2) does not support audio or other ancillary data types.
4.7 OSD Layers
The DX-2200-TI supports three video layers that are mixed on top of the SDI video input(s).