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Standard configuration to ambisonics

The signal is encoded to ambisonics.

Mono sources are encoded directly to the W (omni) channel.

For multichannel sources, each channel is considered like a mono source with an incident angle based on the channel. For example, a stereo source will have its left channel encoded as a mono source located at 45 degrees to the left, and its right channel encoded as a mono source located at 45 degrees to the right. Here is an exhaustive list of input channel angles in degrees (positive clockwise):

Encoding a source with a given angle of incidence is straightforward.

The signal is encoded to ambisonics with an incident angle based on the game object position relative to the listener position and orientation.

For multichannel files, spread and focus are handled exactly as they are with standard configurations: virtual sources representing various input channels are laid out around the listener based on the game object, listener, focus, and spread, and then are encoded accordingly. Refer to Defining the Attenuation Curves for Various Object Properties and 3D Positioning Illustrated for more details about spread and focus.

Ambisonics to ambisonics

Direct speaker assignment occurs. If the input has a higher order, the extra channels are dropped. If the input has a lower order, the extra channels of the output are left silent.

	Note
	The Speaker Panning mode Balance-Fade is always ignored with ambisonics.

3D spatialization of an ambisonic source acts like normal multichannel 3D spatialization. With a spread of 0%, the ambisonic input is collapsed into a mono sound, located at the position of the emitter game object. With a spread of 100%, and Spatialization Mode set to Position + Orientation, the ambisonic input is rotated with respect to the relative orientations of the game object and listener. However, it is not rotated if Spatialization Mode is set to Position Only. Refer to 3D Positioning Illustrated for more details about 3D spatialization.

When input and output orders differ, rotation is computed on the smaller order and higher orders are silenced.

Ambisonics to standard configuration

The ambisonics signal is decoded to the output configuration using speaker positions specified by the game. Refer to SetSpeakerAngles() (in AK::SoundEngine) for information on how to set speaker positions.

The ambisonic bed is rotated and contracted like it would be if the output configuration were ambisonics (see above), but is then decoded to the output standard configuration.