KSTR
Major Contributor
The basic trinaural equations are:
L' = L - R/2
R' = R - L/2
C = (L+R)/2
Setup is +-45° for the sides, not +-30° as with normal2-speaker projection.
Therefore, except for content excactly panned 50% to the side, all three speaker get signal any given time. The center image (mono) content is 6dB louder on the center than on the sides. L- or R-only get virtualized with center rendering one part of the signal and the sides working in push-pull fashion generationg the other part, creating a larger stable wave-field around the head that is less prone to collapse under lateral and rotational movement of the head.
There are comb filter effects (beginning right in all three speaker signals with time-difference based -- "AB", vs "YX" -- stereo content) , too, but they are perceptually more benign, actually increasing spaciousness by creating HRTF-triggered pseudo-3D phantom souce localizations, very noticable on reverb tails etc.
L' = L - R/2
R' = R - L/2
C = (L+R)/2
Setup is +-45° for the sides, not +-30° as with normal2-speaker projection.
Therefore, except for content excactly panned 50% to the side, all three speaker get signal any given time. The center image (mono) content is 6dB louder on the center than on the sides. L- or R-only get virtualized with center rendering one part of the signal and the sides working in push-pull fashion generationg the other part, creating a larger stable wave-field around the head that is less prone to collapse under lateral and rotational movement of the head.
There are comb filter effects (beginning right in all three speaker signals with time-difference based -- "AB", vs "YX" -- stereo content) , too, but they are perceptually more benign, actually increasing spaciousness by creating HRTF-triggered pseudo-3D phantom souce localizations, very noticable on reverb tails etc.