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A demonstration of Directivity Index for (1) unoccluded ear, (2) Omni-directional microphone, and (3) PPT (cutoff frequency of 1 kHz) measured with a KEMAR in an anechoic chamber. Adapted from Keidser, et al. Int J Audiol 2009;48:789-803.17) PPT: pinna-cue preserving technologies.
