Tiernan VBI Data Transmission
01-0868-401B 12/02
71
DVB 4:2:2 Expanded Windows is supported on a composite analog or component
digital (SDI) format video signal. This standard supports both PAL/625 and
NTSC/525 format video standards, and can transmit any of the following VBI
services:
■
PAL mode: Teletext, PDC, WSS, and VPS
■
NTSC mode: ATSC Closed Captions, V-Chip, AMOL I and II, and VITC
Operational Considerations
■
Ensure that both VBI teletext and closed captions are disable when either 16-
or 32-line expanded windows are enabled, as teletext and closed captions
overwrite expanded windows data.
■
Chroma must be set to 4:2:2 for proper expanded windows operations.
Hardware Requirements
■
Encoders will properly process Expanded Windows VBI data with any of the
following modules: TVIP-6021, TVIP-6025, or TVIP-6001.
■
The TDR60 decoder processes VBI data in its standard configuration.
End-to-End Configuration
To configure the encoder and decoder for DVB 4:2:2 Expanded Windows
operation, follow these steps:
Encoder
1. Ensure that all other VBI schemes are disabled, including Teletext, ATSC
closed captions, and Tiernan closed captions.
2. Ensure that VBI data is included in the selected service video input signal.
3. Set chroma to 4:2:2 mode. Issue the front panel command
Config>Service #>Video>Chroma=4:2:2
or the remote
VE.<port> CHROMA 4_2_2
command.
4. Configures the encoder to transmit either 16 or 32 lines of VBI information.
Issue the front panel command
Config>Service #>VBI>Expand>
VBI_Passthru=type
or the remote
VE VBI_PASS type
command,
where type is set to 16_lines or 32_lines.
Active Picture
VBI Region
Line 22 First Line of Active Video
Line 262 Last Line of Active Video
32-Lines Expanded Windows
Field
for an Encoded Picture Frame
Lines 7 to 21 VBI Data
}
NTSC
Line 23 First Line of Active Video
Line 311 Last Line of Active Video
Lines 7 to 22 VBI Data
}
PAL
