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74 01-0870-401B 01/03
Tiernan VBI Data Transmission
3. Enable the encoder for Tiernan closed captions. Issue the front panel
command
Config>Service #>VBI>Tiernan CC=On or the remote
VE TCC ON command.
Decoder
4. Set the decoder VBI format control to automatically detect the type of VBI
data to decode. Issue the front panel command
VBI>Format>VBI Format Cntrl=Auto or the remote
VBI CONTROL AUTO
command.
5. If your system requires you to manually set the type of VBI data to decode,
follow these steps:
a. Set the decoder VBI format control to manual. Issue the front panel
command
VBI>Format>VBI Format Cntrl=Manual or the remote
VBI CONTROL MANUAL command.
b. Set the VBI format to Tiernan closed captions. Issue the front panel
command
VBI>Format>VBI Format=Tiernan CC or the remote
VBI FORMAT TIERNANCC command.
DVB 4:2:2 Expanded Windows, 16-line and 32-line
Tiernan encoders and decoders support both 16- and 32-line expanded windows
operations. As with normal video encoding, the first 6 lines of the VBI region
contain timing set-up information. Expanded Windows use the remaining lines in
the VBI region, either 16 or 32 per frame (8 or 16 per field), to transmit data.
Active Picture
VBI Region
Line 22 First Line of Active Video
Line 262 Last Line of Active Video
16-Line Expanded Windows
Field
for an Encoded Picture Frame
Lines 14 to 21 VBI Data
}
NTSC
Line 23 First Line of Active Video
Line 311 Last Line of Active Video
Lines 15 to 22 VBI Data
}
PAL