Chapter 6 Audio Modules
IOM-RAC2 Module
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53
Electra 9200, Rev O
IOM-RAC2 Audio Encoding Features
Table 6–2: IOM-RAC2 Audio Encoding Features
Feature
Support
Audio Density
n
Decode, level, and encode16 audio streams, with no more
than 8 streams of multi channel. Example: 8 streams of multi
channel plus 8 streams of stereo are allowed.
Input format
n
MPEG-2 Transport Stream: up to 16 streams
n
Embedded: from SDI (synchronous to video
Audio encoding
format
n
MPEG-1 Layer II 2.0 compression
n
AC-3 5.1 or 2.0 compression
n
AC-3 metadata input
n
AC-3 5.1 or 2.0 pass-through
n
E-AC-3 5.1 or 2.0 compression
n
AAC/HE AAC 2.0 (v1, v2)
n
AAC/HE AAC 5.1
Audio decoding
format
n
MPEG-1 Layer II (TS input only)
n
AC-3 5.1 or 2.0
n
E-AC-3 5.1 or 2.0
n
AAC/HE AAC 2.0 (v1, v2)
n
AAC/HE AAC 5.1
n
Dolby E (SDI input only)
Extraction from serial
digital video (48 kHz
sampling only)
n
Select up to eight pairs from any four groups
IOM-RAC2 Coding Mode, Sampling Frequencies
lists the IOM-RAC2 features for each coding mode, including the supported
sampling frequencies.
Table 6–3: IOM-RAC2 Coding Mode and Sampling Frequencies
IOM-RAC2 Feature
Coding Mode
Sampling
Frequency
MPEG-1 Layer II
compression
Single channel (1.0) Left
and Right
32 kHz
44.1 kHz
48 kHz
n
Dual channel (1+1)
n
Stereo channel (2.0)
n
Joint stereo channel
32 kHz
44.1 kHz
48 kHz
MPEG-1 Layer II
compression
SPPC (separate PID
per channel)
Single channel (1.0)
32 kHz
44.1 kHz
48 kHz
