USB3-FRM14 Users Manual (Rev 1.1)
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- http://www.daqsystem.com
2.5 Ancillary Data
USB3-FRM14 board can show Vertical Ancillary Data (VANC).
Ancillary Data(commonly abbreviated as ANC Data), in the context of television system,
refers to a means which by non-video information(such as audio, other forms of essence, and
metadata). It may be embedded within the SDI(Serial Digital Interface), is standardized by
SMPTE291M(Ancillary Data Packet and Space Formatting).
ANC data are divided into two types as [Figure 2-10], depending on where they are located.
Ancillary packets located in the horizontal blanking area, are known as
Horizontal Ancillary
Data
or
HANC
, HANC is commonly used for higher-bandwidth, mainly is embedded audio. In
case of HD can be embedded 16 channels audio. Ancillary packets located in the vertical
blanking area, are known as
Vertical Ancillary Data
or
VANC.
VANC is
commonly used for
lower-bandwidth. Closed caption data and VPID(Video payload identifier) are generally stored
as VANC.
[Figure 2-11. HANC and VANC Area]
