Tiernan VBI Data Transmission
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Overview The latest series of Tiernan encoders and decoders can be configured to transmit various types of Vertical Blanking Interval (VBI) data when it is present in the input video.
The following decoders and encoders support one or more methods for transmitting VBI data:
■TDR6 – software 3.20 or later
■TE6000A and TE6000 – software V2.21 or later
VBI Basics A standard NTSC TV signal consists of 525 horizontal lines, referred to as a frame. Each frame is divided into two fields, each with 262 ½ lines. The first 21 lines of each field are the VBI region; the remaining lines contain the active video picture.
A standard PAL TV signal consists of 625 horizontal lines, referred to as a frame. Each frame is divided into two fields, each with 312 ½ lines. The first 22 lines of each field are the VBI region; the remaining lines contain the active video picture.
For standard NTSC and PAL video encoding, the first 6 lines of the VBI region contain vertical timing pulses. VBI data is not allowed on these lines, however the remaining lines in the VBI region are available to carry any type of data.
PAL | } | |
Lines 7 to 22 VBI Region | ||
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Line 23 First Line of Active Video |
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Line 311 Last Line of Active Video 
VBI Region
Active Picture
Normal Field for an Encoded Picture Frame
NTSC
}Lines 7 to 21 VBI Region
Line 22 First Line of Active Video
Line 262 Last Line of Active Video
Typical forms of data included in the VBI of broadcast video transmissions are World System Teletext (WST), VPS, WSS, NABTS, Closed Captions, XDS, AMOL, Vchip, and VITC.
Tiernan VBI Data Transmission |
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