Glitch Suppression Mode
When in Dolby Digital pass through mode, the coding module monitors the encoded bitstream and if the framing structure is
incorrect, a valid silence frame or the last good frame is inserted in its place. If this state occurs for more than a second, the
Encoder signals that the Dolby Digital bitstream is corrupted.
Test Tone
The VCMs can generate a
test tone
on any audio channel at 1 kHz
Advanced Settings
Dolby Digital (AC-3) components by default use the descriptor defined by the DVB in the PMT. However the AC-3 PMT Descriptor
Syntax control available in the Audio Module/Advanced menu enables this descriptor to be forced to the ATSC AC-3 descriptor.
Vertical Blanking Interval (VBI) Data
General
All VBI information carriage are configurable (either enabled or disabled). The video line from which the VBI is extracted is
configurable. The default is set according to the recognised standard for the VBI type.
VBI Lines
Up to at least 8 VBI lines per field can be extracted. Unless otherwise stated, all VBI data are formed into one VBI transport stream
packet that conforms to
ETSI EN 301 775
or
SCTE 127
.
VBI Data
Data can be extracted from the vertical blanking interval of the incoming video stream, processed, and then included in the output
transport stream.
The following is a summary of the VBI Data functionality available from the unit.
VBI Data on a Separate PID
The VBI data is packetised within MPEG-2 PES packets as specified in ETSI ETS 300-472 (teletext), ETSI EN 301 775 or SCTE 127
for all other VBI data.
Refer to Transport Stream Output >
VBI Data on a Separate PID
for more information.
Closed caption data, and aspect ratio signalling can also be inserted in to the compressed video elementary stream.
been purchased
Dolby Digital pass through (Dolby
Digital AC-3)
Glitch suppression is supported in this mode
8
Dolby Digital Plus pass through
Glitch suppression is supported in this mode
8
DolbyE pass through
Compliant with SMPTE 302M
8
LPCM pass through
Compliant with SMPTE 302M
8
Component
Comments
Video Index
It is possible to extract video index and another VBI type from the same line.
Closed Captions
Via line 21 & 284 (CEA-608C) or
SMPTE
334 (extracted from VANC data - 525
Line only).
Monochrome 4:2:2
Up to 3 lines can be extracted per frame.
Teletext
Up to 18 lines can be extracted per field.
Aspect Ratio Signalling
WSS
/WSS-AFD/
AFD
/
AFD and Bar Data
via
VANC
© Ericsson AB 2011. All rights reserved
Page 18 of 153
Cover
9/11/2012
file://C:\Users\ebriacl\AppData\Local\Temp\~hh7DF.htm
