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If we wish to reproduce all those effects through an audio system, than we
need to take IID, ITD, pinna effects, room impulse response, etc. into
account.That is where Head-Related Transfer Functions (HRTF) come into
play.
An HRTF is a mathematical equation that describes how a sound is effected
when travelling from its source to our ears.
There are several ways to synthesise an HRTF.The most common way to
measure an HRTF makes use of placing tiny microphones in a listener’s ears.
Every person has its unique HRTF. However, we can identify crucial parts in
an HRTF that are responsible for localization of sound as if this sound
would be radiated by a typical home cinema speaker set-up.
When these parts are synthesized in an optimal way, a typical 5 speaker set-
up listening experience is created.
HRTFs are implemented in real-time Digital Signal Processors (DSP) and
will then be applied to audio signals in order to reproduce "spatial" cues, i.e.
create a sense of directionality.
It is through these techniques that Philips is able to bring you a home
cinema experience through a headphone that is as real as when you would
be listening to an actual 5.1 speaker set-up.
0912HP_EU 09-12-2003 12:12 Pagina 8