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INS-VIG
Video Index Information Coding 을 생성 SDI에 삽입하는 장비
RS-232 컨트롤
입력 : SDI
출력 : SDI, Composite(옵션) Video Index Data Inserter
Product Description
The Video Index Data Inserter is used to generate Video Index Information Coding as described in SMPTE
document RP186. This data is then inserted into a serial digital video stream in the manner defined by
RP186. The data is entered from the front panel, GPI 's or from remote control RS232 / 422.
Video Index Coding
It is a technique used to encode program and picture related source information in conjunction with a
component digital video signal. The data is encoded in bit 2 of the chrominance signal (assuming a 10 bit
signal where bit 0 is the lsb and bit 9 is the msb), on lines 11 and 324 for a 625 line signal, or lines 14 and 277
for a 525 line signal.
The data is organised into three groups called classes.
Class 1 Information required to display or perform processing upon the picture
Class 2 How the video was originated or previously processed
Class 3 Other information relating to the video but not needed for display
The Classes are further divided into sub classes (eg. Class 1.1, 1.2 and 1.3). For full details of all the
information that can be transported by the video index system we advise studying the SMPTE document. A
copy of this document can be found in SMPTE Journal of Aug 95
Signalling Aspect Ratio in Digital TV Systems
The main application for Video Index has been to signal the aspect ratio within wide screen systems. A
number of Aspect Ratio Conveters will read the Video Index and autoswitch based upon the it.
UK broadcasters have also utilise some of the spare bits, in the standard to convey Active Format Descriptor
(AFD*). This AFD data will indicate how the picture should be treated / displayed, by equipment such as
aspect ratio converters and set top boxes. For example in a 4:3 frame you may have a 14:9 letter box. The
source AR is therefore 4:3 and the AFD is 14:9.
The Video Index Inserter can support the signalling of this AFD data.
Within a system using video indexing it is not necessary to support all classes (or even sub classes),
however it is mandatory to provide class 1.1 data.
Inputs: Program - Serial Digital Video (270Mb/s).
Outputs: Main Program - Serial Digital Video (270Mb/s) with power fail bypass
Auxiliary - Serial Digital Video (270Mb/s).
Monitoring - PAL/NTSC analogue composite video (Optional).
Note that when the unit is inserting the Video Index data, only bit 2 of the chroma is affected. The
Luminance samples, and the other bits of chroma are passed through unchanged.
Control: Front panel controls allow setting of all Class 1.1 parameters and the AFD extensions.
GPI inputs allow setting of the source AR and the AFD parameters
RS232 / RS422 enable remote setting of all parameters
Physical: 1U case 400mm deep. Power 60VA. 110/220/240 link select.
Product Code: INS-VIG Video index data inserter unit
Option: -MON Analogue Composite video output for PAL/NTSC monitoring.
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