Psychoacoustically optimum matrices are described, which can be applied for reproducing stereophonic signals, intended for reproduction via n1 loudspeakers via a larger number n2 of loudspeakers, using velocity and sound-intensity theories of sound localization. Optimal decoder designs for reproducing two-channel stereo via three loudspeakers are described in detail, using frequency-dependent matrix coefficients, along with uses in music and television applications where a stable stereo image over a large listening aea is required.
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