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76 01-0870-401B 01/03
Tiernan VBI Data Transmission
Decoder
5. 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.
6. If your system requires you to manually set the type of VBI data to Expanded
Windows, 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 either 16- or 32-lines Expanded Windows.
From the front panel, issue the command
VBI>Format>VBI Format=#
where # is set to 16-line or 32-line.
From a remote terminal, issue the command
VBI FORMAT # where # is
set to
lines16 or lines32 .
Encoder
Command
Listing
This section provides a detailed description of the front panel and remote
commands used to configure Tiernan encoders for VBI operations.
Front Panel Commands for
Encoder
Configuration
Tiernan Closed Captions Front Panel Commands
Expanded Windows Front Panel Commands
Config>Service # >VBI>CC — used to configure the encoder to transmit closed captions
Tiernan CC configures the encoder to transmit
Tiernan closed captioning
information
The Tiernan CC transmission
described in this document is
Tiernan proprietary
. Only Tiernan
decoders accommodate the Tiernan
CC feature described in this
document:
Note
: Tiernan CC should
not
be
implemented in PAL mode, as the
closed caption information will be
decoded and placed on line 22 of
the video.
■ on – encodes two lines of VBI information per
frame (one per field) at the expense of losing
two lines of active video (one per field)
The encoded picture is simply shifted up one
line to include the last line of VBI and to
exclude the last line of active video in each
field.
■ off – does not encode any VBI information
(default)
Note
: Data transmitted in the VBI region using
the Tiernan CC command will experience a
degradation in quality given the inherently
“lossy” compression of MPEG.
Config>Service # >VBI>Expand — used to configure the encoder to transmit data in 16-line or
32-line expanded windows mode
VBI_Passthru Configures the encoder to transmit
either 16 or 32 lines of VBI
information
■ Off – disables expanded windows mode
(default)
■ 16-line – enables 16-line expanded windows
mode
■ 32-line – enables 16-line expanded windows
mode