Asylum 626, the sequel to the game (Hotel626) we were all gushing about uses head tracking technology, which allows the users to control the action via webcam.
e.g. Chainsaw closet scene
Users can wave their hands to dodge the blade
or in other parts, live video of players will appear on reflected surfaces.
Head-tracking technology
Conventionally, one of the challenges of sound reproduction using headphones is that the sound field moves with the rotation of the listener's head. VIP-1000 and MDR-DS8000 have Gyro Sensors attached to the headsets. They calculate the rotating angle of the head and based on the angle, make data adjustments to fix the sound fields using digital signal processing. In other words, real time adjustments of HRIR from the source to the ears are made as the head moves.
Therefore, even when the listener looks to his/her side wearing the headphone, the sound field will stay fixed, allowing him/her to enjoy close-to-live sound images with a realistic sound field. This can be explained from an acoustic physiological point of view as a phenomenon of sound stimulation reaching motor center in the head becoming closed loop. By switching on and off the head-tracking switch of the headphone indicated in the above diagram, it is clear that head movement largely affects the sound positioning
Therefore, even when the listener looks to his/her side wearing the headphone, the sound field will stay fixed, allowing him/her to enjoy close-to-live sound images with a realistic sound field. This can be explained from an acoustic physiological point of view as a phenomenon of sound stimulation reaching motor center in the head becoming closed loop. By switching on and off the head-tracking switch of the headphone indicated in the above diagram, it is clear that head movement largely affects the sound positioning
The principle of head-tracking technology
Human beings determine the distance and direction of the source of the sound through a kind of triangulation. However, when a person rotates his/her head, the brain gets confused unless these characteristics synchronically change with the head movements. As a result, the sound image tends to be fixed within the listener's head or in the original position. This is one of the reasons why the sound appears to originate inside the listener's head when using conventional headphones. Although it is technically possible to keep the sound image outside the listener's head by adjusting the patterns of reflected waves from the wall, the sound image tends to get fixed inside the head when the person is just listening to sound without a visual image. Head-tracking technology is a solution to this problem. By constantly tracking head movements, real time adjustments are provided for the characteristics of sound transmission from the source to the ears, thus, enabling constant and continuous accurate triangulation and resulting in a clear image of the fixed position in the front. Piezoelectric vibration gyros were adopted for tracking.
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