The forthcoming advent of 3-channel stereo in HDTV and DAB sound means that recording engineers will have to relearn the art of stereo microphone techniques for three or more loudspeaker reproduction. Known and new microphone techniques are described, including those using matrix methods, including a three-loudspeaker technique using a Soundfield microphone, and techniques using spaced mono microphones and spaced pairs or triples of one-point stereo microphones. Mono and two-loudspeaker stereo compatibility will also be considered.
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