Technical Specification
Loss of Video
On loss of video the VCM can be configured to select freeze frame, test pattern, or
turn off output.
B.3.12 Audio
B.3.12.1 Encoding Stereo
Depending upon licenses each audio module on the VCMs can encode the following
listed coding standards.
Table B.20 Encoding Stereo Specification
Coding Standard
Maximum
Number
Description Comments
Dolby Digital 6 AC-3 or Encode
Only available when CE/SWO/DOLBY/AC3 has
been purchased - 1 license required per channel
pair.
MPEG Layer 2 8
MPEG -1 Layer II /
Musicam Encode
Stream type MPEG-1 or MPEG-2 (user
selectable), more than two channels are only
available with CE/SWO/M1L2 license - 1 license
required per channel pair.
Advanced Audio
Coding
6
AAC-LC, HE-AAC,
HE-AACv2
Only available when CE/SWO/AAC has been
purchased - 1 license required per channel pair.
B.3.12.2 MPEG-1 Layer II Encoding
The VCMs support the following coding modes for MPEG-1 Layer II.
Table B.21 MPEG-1 Layer II Supported Modes
Coding Mode Implementation Comments
Mono (left) 1/0 (L – input)
Mono (right) 1/0 (R – input)
Dual mono 1 + 1 (L/ch1, R/ch2)
Left and right are coded separately, referenced as
two services/languages
Stereo 2/0
Coded as two mono signals, only referenced as
one language/service in SI, output as stereo at the
receiver
Joint Stereo 2/0 joint
Coded as a stereo pair, coding takes advantage of
them being stereo, only referenced as one
language/service in SI, output as stereo at the
receiver
6/8 Channel Aligned 1 + 1
Mono [1/0 (L - input) or 1/0 (R - input)]
This mode has a single audio channel that is encoded independently. It is seldom
used in broadcast as most viewing devices now have stereo speakers or
headphones.
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