O1A Decoder - Auro-3D 9.1, 10.1, 11.1 and 13.1

O1A Decoder - Auro-3D 9.1

Host Support

O1A Decoder - Auro-3D 9.1

Host TypeSupport
AAXYes, output mapped to 7.1.2 (Dolby Atmos) stem
VST2Yes

O1A Decoder - Auro-3D 10.1

Host TypeSupport
AAXNo
VST2Yes

O1A Decoder - Auro-3D 11.1

Host TypeSupport
AAXNo
VST2Yes

O1A Decoder - Auro-3D 13.1

Host TypeSupport
AAXNo
VST2Yes

Audio

O1A Decoder - Auro-3D 9.1

ChannelsContent
Input4O1A
Output10Auro-3D 9.1 (mapped to 7.1.2 for AAX)

O1A Decoder - Auro-3D 10.1

ChannelsContent
Input4O1A
Output11Auro-3D 10.1

O1A Decoder - Auro-3D 11.1

ChannelsContent
Input4O1A
Output12Auro-3D 11.1

O1A Decoder - Auro-3D 13.1

ChannelsContent
Input4O1A
Output14Auro-3D 13.1

Controls

Description

Four decoder plugins are provided, which produce Auro-3D surround mixes from O1A streams. The plugins correspond to each of the Auro-3D 9.1, Auro-3D 10.1, Auro-3D 11.1 and Auro-3D 13.1 speaker layouts.

These plugins do not perform bitstream encoding to allow transmission of Auro-3D over backwards-compatible formats. The output is in a form suitable to be fed directly to speaker channels, or to such an encoder.

Channels

The channel orderings used for the Auro-3D formats are:

Auro-3D 9.1Auro-3D 10.1Auro-3D 11.1Auro-3D 13.1Channel Name
1 1 1 1 Front Left
2 2 2 2 Front Right
3 3 3 3 Front Centre
4 4 4 4 LFE
5 5 5 5 Surround Left
6 6 6 6 Surround Right
- - - 7 Back Left
- - - 8 Back Right
7 7 7 9 Height Front Left
8 8 8 10 Height Front Right
9 9 9 11 Height Surround Left
10 10 10 12 Height Surround Right
- - 11 13 Height Front Centre
- 11 12 14 Top Ceiling

Please note that when Auro-3D 9.1 is mapped to 7.1.2 (Dolby Atmos) for AAX, no attempt is made to map to channels where they correspond. The channels simply appear in the order above.

The plugin is available in the O1A Decoding plugin library.

Controls

Control: Method

Three methods are supported, "Basic", "Reconstruction" and "Tinted Reconstruction". Generally, "Basic" is recommended except where the speaker rig to be used for playback is known and has been set up accurately.

MethodDescription
BasicThis method produces a resilient decoding which should play well on a range of speaker systems including large venues.
ReconstructionThis method controls the soundfield at the centre of the listening space to produce a clearer spatial image. It relies on the speaker layout being set up accurately.
Tinted ReconstructionThis variant of the Reconstruction method performs HRTF-based tinting on the audio stream to strengthen the spatial image. Again, it relies on the speaker layout being set up accurately.

Control: LFE Crossover

This determines if any audio is sent to the LFE channel. It may be set to "Off" and this is recommended. If enabled, audio is extracted from the main mix into the LFE channel using the indicated crossover frequency (between 1 and 200Hz).

Control: LFE Gain

If the LFE gain is active, this gain is applied to it. Some export formats may need this set to -10dB to take into account a +10dB gain applied during playback.