Tiernan TDR60, Инструкция по установке и эксплуатации

Страница: 83 / 92

Tiernan VBI Data Transmission
01-0868-401B 12/02 73
Command Listing
This section provides a detailed description of the front panel and remote
commands used to configure Tiernan encoders and decoders for VBI operations.
Encoder Command
Listing
Front Panel Commands for Encoder Configuration
Teletext Commands
ATSC Closed Captions Front Panel Commands
Tiernan Closed Captions Front Panel Commands
Expanded Windows Front Panel Commands
Config>Service # >VBI>Teletext — used to configure the encoder to transmit teletext data
Enable Configures the encoder to transmit
teletext information
■
off – does not encode any teletext
information (default)
■
all – encodes entire VBI teletext area; i.e.,
allocates bit-rate to include maximum
number of Teletext lines
■
auto – automatically allocates bit-rate to
include only the number of detected
Teletext lines.
Data ID Setting determines is EBU data
included in the Teletext. Values from
0x10 to 0x1F reflect EBU data. 0 to 255
Default: 1
Data Unit ID Data Unit ID defines if there are EBU
Teletext sub-titles included in the
data. Data Unit ID has range from 0 to 255. Values
are:
■
2 = EBU Teletext non-subtitle data is not
included (default)
■
3 = EBU Teletext subtitle data is included
Note
: Data Unit ID must be set to 2 or 3 for
proper decoder operation.
Config>Service # >VBI>CC — used to configure the encoder to transmit closed captions
ATSC CC Configures the encoder to transmit
ATSC closed caption information
■
on – encodes ATSC VBI information
■
off – does not encode any ATSC VBI
information (default)
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_Passthr
u 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