APPEAR AS Confidential 235/352
• Dolby Digital (AC-3) and Dolby Digital Plus (E-AC-3) multi-channel encoding and pass-through
Please refer to the encoder datasheet and license information for specifics on what is supported. The following
sections outline the parameters supported for each audio format and how/where these are configured.
9.2.6.1 Audio Support (EC-100, EC-200, AC-100, AC-200)
On the encoder module, there are one (for SD or Analog mode) or two (for HD mode) general purpose audio
encoders per channel. These channels support MPEG-1, AAC-LC, HE-AACv1 and HE-AACv2 encoding and Dolby
Digital (AC-3) pass through. In addition there are up to 12 MPEG-1 encoders or 4 AAC-LC encoders that can be
distributed among the channels on a board. A mixture of MPEG-1 and AAC encoders are allowed per board and
this is outlined in the table below.
If Dolby Digital (AC-3) is present on the input signal (embedded SDI or AES), this can be passed through to the
encoded output service
9.2.6.2 Audio Support (EC-400)
The EC400 high performance broadcast encoder can do 4 stereo pairs per encoded video. This can be a mix of
MPEG-1(0x03) layer 2, MPEG-1(0x04) layer 2, AAC-LC, HE-AAC v1/v2, Dolby Digital and Dolby Digital Plus.
MPEG-1(0x03) layer 2, MPEG-1(0x04) layer 2, AAC-LC, HE-AACv1 and HE-AACv2 capacity is licensed in one
combined license, where one license allows for the encoding of one stereo pair.
Dolby Digital and Dolby Digital Plus encoding capacity is licensed in one combined license, where one license
allows for the encoding of one stereo pair. One 5.1 encoding requires three licenses, and one 7.1 encoding
requires four licenses.
9.2.6.3 Audio Parameter Configuration
Audio streams/encoders are added and configured on the audio tab on the encoder properties page. The
available options will vary depending upon the number of unused audio licenses and hardware capability.
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