Three-dimensional perceptions in haptic systems
View Patent ↗An acoustic field may be produced from a transducer array having known relative positions and orientations in this acoustic field, one or more control points may be defined. An amplitude may be assigned to the control point. Mid-air haptic effect for a virtual object on a human body part may be generated by moving the control point in a single closed curve comprising a plurality of curve segments. The single closed curve traverses at least one location where the human body part intersects with the virtual object. Additionally, a user may interact with virtual three-dimensional content using the user's hands while a tracking system monitoring the user's hands, a physics engine updates the properties of the virtual three-dimensional content and a haptic feedback system provides haptic information to the user.
1. An method comprising:
producing an acoustic field from a transducer array having known relative positions and orientations;
defining a control point, wherein the control point has a known spatial relationship relative to the transducer array;
generating a signal from a mid-air haptic-based action; and
moving the control point in a trajectory that encodes the signal into a sound waveform.
2. The method as in claim 1 , wherein moving the control point results in the sound waveform being audible to a human ear.
3. The method as in claim 2 , wherein moving the control point results in the sound waveform being a localized audio source.
4. The method as in claim 3 , wherein the moving the control point occurs without amplitude modulation.
5. The method as in claim 2 , wherein the signal is interpreted as a linear path along which the control point moves to create the sound waveform.
6. The method as in claim 5 , further comprising:
digitally sampling and interpreting the signal as a parameterized position along the linear path.
7. The method as in claim 5 , further comprising:
digitally sampling the signal and decomposing the signal into in-phase and quadrature components.
8. The method as in claim 7 , wherein decomposing the signal into in-phase and quadrature components comprises applying a Fourier transform to the signal and applying an/2 phase offset.
9. The method as in claim 7 , wherein the signal is mapped onto a one-dimensional closed curve.
10. The method as in claim 7 , wherein the signal is mapped onto a two-dimensional surface.
11. The method as in claim 2 , wherein the trajectory comprises a three-dimensional path.
12. The method as in claim 2 , wherein the trajectory is adjusted to provide phase cues that govern stereo audio.
13. The method as in claim 12 , wherein the phase cues that govern stereo audio use a single sound source.
14. The method as in claim 2 , further comprising:
producing, by the control point, a mid-air haptic effect.
15. The method as in claim 12 , further comprising:
defining a second control point, wherein the second control point has a known spatial relationship relative to the transducer array;
generating a second signal from the mid-air haptic-based action; and
moving the second control point in a second trajectory that encodes the second signal into a second sound waveform;
wherein moving the second control point results in the second sound waveform being audible to a human ear;
wherein the second trajectory is adjusted to provide second phase cues that govern stereo audio.