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Schematic diagram for the measurement location in the evaluation of the attenuation of HPDs via the F-MIRE test method. ✽ Remarks: insertion loss (IL) = A − A′ ≌ REAT; noise reduction (NR) = B′ − A′; TFOE is measured with respect to Point B, which is generally the head-center location with the head absent. NR = IL − TFOE.
