HRTF localization
- An aside.
- Filter-based localization
- Head Related Transfer Function (cf. NASA "Convolvotron"):
- Primary localization cues:
- Interaural Time Difference (ITD)
- Interaural Intensity Difference (IID)
- Head/Pinnae filtering
- HRTF: filtering effect of the head and ears on incoming sound.
- Using probe microphones with human subject or KEMAR mannequin,
get impulse response from numerous positions around, above, below, etc.
- Apply filters thus obtained to adjust timbre of sound according
to desired sound position.
- Ongoing research into streamlining computations and reducing need
for individualized HRTF's.
- Special-purpose systems
- Crystal River Engineering (Now a subsidiary of Aureal)
- Tucker-Davis Technologies
- Lake DSP
- PC cards with 3D sound support (e.g., Diamond Monster Sound MX300
(listen with headphones here),
Turtle Beach Montego, Sound Blaster SBLive!, etc.) becoming
available.
- Some better than others, especially with regard to height and
front-back reversal.
