Ericsson SPR1100 Operations Instructions Page 26

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Introduction
1.3.1.8 Output Video Duplication
A transcoded video output can be duplicated to produce up to four copies. These
copies are required to be sent to different MPTSs and/or different IP addresses.
1.3.2 Audio Processing
1.3.2.1 Audio Transcoding
The SPR1100 can transcode between any of the formats below:
MPEG-1 layer 2
MPEG-2 layer 2
Dolby Digital (AC-3) stereo
Dolby Digital (AC-3) 5.1
HE-AAC stereo
HE-AAC 5.1
AAC-LC stereo
AAC-LC 5.1
It is possible to down-mix 5.1 to stereo, and up-mix stereo to 5.1. However, up-
mixing stereo to 5.1 only actually puts the stereo on the 5.1, leaving the 3.1 silent.
1.3.2.2 Quantity of Audio Transcodes per Module
The maxi
mum number of audio transcodes per module is dependent on what it
transcodes from and to. The maximum number per
module is shown in Table 1.13.
Table 1.13 Maximum Quantity of Audio Transcodes per Module
Encode to:
MP1 L2 2.0 DD (AC3) 2.0 DD (AC3) 5.1 HE-AAC-LC 2.0 HE-AAC-LC 5.1
MP1 L2 2.0
24 12 n/a 24 n/a
DD (AC3) 2.0
18 12 n/a 12 n/a
DD (AC3) 5.1
18 12 6 12 6
HE-AAC-LC 2.0
12 12 n/a 12 n/a
Decode from:
HE-AAC-LC 5.1
12 12 6 12 6
The numbers above assume that all the audio transcodes on a particular module are
the same. When mixing different audio transcodes, the maximum numbers should
be scaled accordingly.
2/1553-FGC 101 1400 Uen B
1-18
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