A head-related transfer function is everything your torso, head and outer ears do to a sound before it reaches the eardrum — and every immersive format from binaural to Atmos is a different attempt to reproduce it.
Two ears receive pressure. From that, you locate a sound in three dimensions — left and right, up and down, in front or behind — with enough confidence to turn straight to it without looking. Working out what has to happen for that to be possible is also, as it turns out, the specification every immersive audio format is trying to meet.
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