Periphony (sound reproduction in both vertical and horizontal directions around a listener) may be recorded via practical 2-, 4-, and 9-channel systems, among others. Matrix parameters and microphone techniques are described for 19 different systems, and a design procedure for other periphonic systems is given. Amplitude and energy directional resolution are discussed, as is compatibility with current horizontal-only systems.
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https://aes2.org/publications/elibrary-page/?id=1835
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