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Head tracking

A head tracking and head technology, applied in stereo system, electrical components, etc., can solve the problem that the head tracking system cannot be easily used in mobile applications

Active Publication Date: 2012-01-11
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, these known head tracking systems cannot be easily used in mobile applications where the user moves

Method used

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Embodiment Construction

[0035] The present invention relates to head tracking suitable for use in headphone reproduction for realistic out-of-the-head illusions.

[0036] figure 1 The illustration shows head rotation. The user's body 100 is depicted with a body torso 100a and a head 100b. Axis 210 is the head rotation axis. The rotation itself is depicted by arrow 200 .

[0037] figure 2 An angle of rotation 300 of the user's head 100b relative to a reference direction 310 is shown. A top view of a user 100 is depicted. Direction 310 is assumed to be the forward direction of the body torso 100a, which is also considered to be the medial direction of the head 100b. Then, the forward body direction is determined as the direction using the user's shoulder as a reference and facing the direction in which the user's face is pointing. The forward body direction is determined regardless of the position of the user's body, eg, whether the user is reclining or half-sitting half-lying on a lounge chair...

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Abstract

A head tracking system (400) is proposed in the present invention that determines a rotation angle (300) of a head (100b) of a user (100) with respect to a reference direction (310), which is dependent on a movement of a user (100). Here the movement of a user should be understood as an act or process of moving including e.g. changes of place, position, or posture, such as e.g. lying down or sitting in a relaxation chair. The head tracking system according to the invention comprises a sensing device (410) for measuring a head movement to provide a measure (401) representing the head movement, and a processing circuit (420) for deriving the rotation angle of the head of the user with respect to the reference direction from the measure. The reference direction (310) used in the processing circuit (420) is dependent on the movement of the user.; The advantage of making the reference direction (310) dependent on a movement of a user is that determining the rotation angle (300) of the head (100b) is independent of the environment, i.e. not fixed to environment. Hence whenever the user (100) is e.g. on the move and his body parts undergo movement the reference direction is adapted to this movement.

Description

technical field [0001] The invention relates to a head tracking system, and the invention also relates to a head tracking method. Furthermore, the invention also relates to audio reproduction systems. Background technique [0002] Headphone sound reproduction typically provides an experience of sound being perceived "in the head". Various different virtualization algorithms have been developed which create the illusion of sound sources located at a certain distance and in a certain direction. Typically, the purpose of these algorithms is to approximate the transfer function of a sound source (eg, in the stereo case, two loudspeakers in front of the user) to the human ear. Therefore, virtualization is also called binaural sound reproduction. [0003] However, simply applying fixed virtualization is not enough to produce realistic out-of-head illusions. Human orientation perception seems to be very sensitive to head movement. If the virtual sound source moves with head mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04S7/00
CPCH04S7/304
Inventor P.H.A.迪伦A.W.J.乌门E.G.P.舒伊杰斯
Owner KONINK PHILIPS ELECTRONICS NV
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