Some Frequently Asked Questions about 3D mixing and the O3A plugins.
Higher Order Ambisonics is a mathematical framework for handling 3D sound scenes or "soundfields".
B-Format is the main audio format used for Higher Order Ambisonics.
This is a multichannel audio format where the individual channels do not correspond directly to speaker feeds. There is no "front left" channel.
Binaural stereo attempts to simulate 3D audio on headphones, by modifying sound as if it had travelled around your head and past your ears.
The "Advanced" edition of Rapture3D supports custom speaker layouts.
In Higher Order Ambisonics, the main audio stream in use is B-Format. It must be "decoded" for playback.
"Amber" is a 3D HOA "binaural" decoder method for headphones that is available in Rapture3D and our pro audio products.
Rapture3D Advanced v2.7.0 introduced support for the import of personalised HRTFs from AES69 files.
Personalised HRTFs are effectively acoustic models of an individual's head. Using these, it is possible to create synthetic binaural stereo which is tailored for a particular individual.
RAMBL provides a reference implementation of the N3D and SN3D equations in C using the ACN channel ordering sequence.
B-Format audio stream can be rotated using matrix multiplication. This moves all material in the soundfield.
3D7.1 is a speaker layout that is designed to work with the kit needed for a 7.1 system, but places the speakers differently.
If you're using the Rapture3D game engine in Stereo, there are quite a few options. Hopefully this page will make them less confusing!