L1 = LW - 10.logF - 20.logr - 10.logfi [dB]
LW: sound levels caused by sources, [dB]
fi: corner location of the sound source in space:
fi = 4π: sound sources placed in space
fi = 2π: sound sources placed in the plane
fi = π: sound sources placed in edge dihedral angle
fi = π / 2: the sound source placed in the center area of the corner edge
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