Philips HP1500 manual English

0912HP_EU 09-12-2003 12:12 Pagina 8

8ENGLISH

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.