O1A Decoder - 3D7.1
Host Support
Host Type | Support |
---|---|
AAX | Yes, output mapped to 7.1 |
VST2 | Yes |
Audio
Channels | Content | |
---|---|---|
Input | 4 | O1A |
Output | 8 | 3D7.1 Surround (mapped to 7.1 for AAX) |
Controls
Description
This plugin takes a first order ambisonics (O1A) mix and decodes it as a 3D7.1 surround mix.
3D7.1 is a modified version of the 7.1 speaker layout invented by Simon N. Goodwin. It is based on the equipment used for 7.1 but places the speakers in different locations, some being raised or lowered.
If you intend to use this decoder then you should move your speakers to these new locations. Alternatively there is a normal O1A decoder for 7.1.
Channel Ordering for AAX
For AAX, the channel ordering and assumed speaker locations for the 3D7.1 surround mix are as follow.
Channel | 7.1 Speaker Position | 3D7.1 Speaker Position | Azimuth | Elevation | Used in 5.1 |
---|---|---|---|---|---|
1 | Front Left | Front Left High | +51 | +24 | Yes |
2 | Front Centre | Front Centre | 0 | 0 | Yes |
3 | Front Right | Front Right High | -51 | +24 | Yes |
4 | Left Surround Side | Rear Left Low | +129 | -24 | Yes |
5 | Right Surround Side | Rear Right Low | -129 | -24 | Yes |
6 | Left Surround Rear | Rear Centre High | +180 | +55 | No |
7 | Right Surround Rear | Front Centre Low | 0 | -55 | No |
8 | LFE | LFE | - | - | Yes |
VST
For VST, the channel ordering and assumed speaker locations for the 3D7.1 surround mix are as follow.
Channel | 7.1 Speaker Position | 3D7.1 Speaker Position | Azimuth | Elevation | Used in 5.1 |
---|---|---|---|---|---|
1 | Front Left | Front Left High | +51 | +24 | Yes |
2 | Front Right | Front Right High | -51 | +24 | Yes |
3 | Front Centre | Front Centre | 0 | 0 | Yes |
4 | LFE | LFE | - | - | Yes |
5 | Rear Left | Rear Centre High | +180 | +55 | No |
6 | Rear Right | Front Centre Low | 0 | -55 | No |
7 | Side Left | Rear Left Low | +129 | -24 | Yes |
8 | Side Right | Rear Right Low | -129 | -24 | Yes |
In the tables above, azimuth is measured anticlockwise (left) from the front and elevation upwards from the horizontal.
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.
Method | Description |
---|---|
Basic | This method produces a resilient decoding which should play well on a range of speaker systems including large venues. |
Reconstruction | This 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 Reconstruction | This 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.
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