This is why the binaural recording technique is worth considering for many purposes. However, in general, everybody experiences a much higher envelopment of the surrounding sound, even though the HRTF is not their own. Thus binaural recordings sound the best if recorded using your personal HRTF. HRTF is closely related to the individual shape of the human head.
On the opposite side of the head, some shadowing effect occurs in the same frequency range. The side of the head closest to the sound source provides a reflection which causes a pressure build-up in the mid-frequency range. The level, the frequency response and the time of arrival differ. However, as soon as the sound moves to one of the sides, the sound becomes different as it reaches each ear. When the sound comes from in front of a person, the influence is symmetrical, meaning that the sound is the same at both ears. The size and the shape of the head, the size and the shape of the ears and the distance between the ears all contribute to a filtering of the acoustical signal before it reaches the eardrums. This transfer function expresses how the head, the ears (and also the torso) affects the transmission of an acoustical signal from a sound source to the eardrums. We express the physical influence from the head by the so-called Head-Related Transfer Function or HRTF for short.
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