Head dimension estimation for spatial audio applications
Embodiments are disclosed for head dimension estimation for spatial audio applications. In an embodiment, a method comprises: obtaining, using one or more processors of an audio headset worn on a user's head, acceleration samples and rotation rate samples over a specified time window while the user rotates their head, the acceleration samples and rotation rate samples measured using motion sensors in the headset; determining a function that relates the acceleration samples to the rotation rate samples; comparing the function to a plurality of reference functions, where each reference function corresponds to a different head dimension in a nominal range of head dimensions; and estimating a dimension of the user's head based on the comparing.
1. A method comprising:
obtaining, using one or more processors of an audio headset worn on a user's head, acceleration samples and rotation rate samples over a specified time window while the user rotates their head, the acceleration samples and rotation rate samples measured using motion sensors in the headset;
determining a function that relates the acceleration samples to the rotation rate samples;
comparing the function to a plurality of reference functions, where each reference function corresponds to a different head dimension in a nominal range of head dimensions; and
estimating a dimension of the user's head based on the comparing.
2. The method of claim 1 , wherein the head dimension is a radius from audio headset to a geometric center of the user's head.
3. The method of claim 1 , wherein the function is determined using linear regression analysis.
4. The method of claim 1 , further comprising:
prior to determining the function, removing a gravitational component and tangential acceleration component from the acceleration samples to obtain a linear relationship between the acceleration samples and rotation rate samples squared.
5. The method of claim 4 , wherein the tangential acceleration component is removed using principal component analysis.
6. The method of claim 1 , further comprising rendering spatial audio using the estimated head dimension.
7. The method of claim 6 , wherein the estimated head dimension is used to select or modify a head-related transfer function (HRTF) of a binaural rendering engine.
8. The method of claim 6 , wherein the estimated head dimension is used to calculate a spatial auditory cue used in rendering the spatial audio.
9. A method comprising:
obtaining, using one or more processors of an audio headset worn on a user's head, acceleration samples and rotation rate samples over a specified time window while the user rotates their head, the acceleration samples and rotation rate samples measured using motion sensors in the headset;
estimating angular acceleration samples from the rotation rate samples;
removing a gravitational component from the acceleration samples;
determining a function that relates the acceleration samples, the rotation rate samples and the estimated angular acceleration samples;
comparing the function to a plurality of reference functions, where each reference function corresponds to a different head dimension in a nominal range of head dimensions; and
estimating a dimension of the user's head based on the comparing.
10. The method of claim 9 , wherein the head dimension is a radius from audio headset to a geometric center of the user's head.
11. The method of claim 9 , further comprising rendering spatial audio using the estimated head dimension.
12. The method of claim 11 , wherein the estimated head dimension is used to select or modify a head-related transfer function (HRTF) of a binaural rendering engine.
13. The method of claim 11 , wherein the estimated head dimension is used to calculate a spatial auditory cue used in rendering the spatial audio.
14. A system comprising:
one or more processors;
memory storing instructions that when executed by the one or more processors of an audio headset worn on a user's head, cause the one or more processors to perform operations comprising:
obtaining acceleration samples and rotation rate samples over a specified time window while the user rotates their head, the acceleration samples and rotation rate samples measured using motion sensors in the headset;
determining a function that relates the acceleration samples to the rotation rate samples;
comparing the function to a plurality of reference functions, where each reference function corresponds to a different head dimension in a nominal range of head dimensions; and
estimating a dimension of the user's head based on the comparing.
15. The system of claim 14 , wherein the head dimension is a radius from audio headset to a geometric center of the user's head.
16. The system of claim 14 , wherein the function is determined using linear regression analysis.
17. The system of claim 14 , further comprising:
prior to determining the function, removing a gravitational component and tangential acceleration component from the acceleration samples to obtain a linear relationship between the acceleration samples and rotation rate samples squared.
18. The system of claim 17 , wherein the tangential acceleration component is removed using principal component analysis.
19. The system of claim 14 , further comprising rendering spatial audio using the estimated head dimension.
20. The system of claim 19 , wherein the estimated head dimension is used to select or modify a head-related transfer function (HRTF) of a binaural rendering engine.
21. The system of claim 19 , wherein the estimated head dimension is used to calculate a spatial auditory cue used in rendering the spatial audio.
22. A system comprising:
one or more processors;
memory storing instructions that when executed by the one or more processors of an audio headset worn on a user's head, cause the one or more processors to perform operations comprising:
obtaining acceleration samples and rotation rate samples over a specified time window while the user rotates their head, the acceleration samples and rotation rate samples measured using motion sensors in the headset;
estimating angular acceleration samples from the rotation rate samples;
removing a gravitational component from the acceleration samples;
determining a function that relates the acceleration samples, the rotation rate samples and the estimated angular acceleration samples;
comparing the function to a plurality of reference functions, where each reference function corresponds to a different head dimension in a nominal range of head dimensions; and
estimating a dimension of the user's head based on the comparing.
23. The system of claim 22 , wherein the head dimension is a radius from audio headset to a geometric center of the user's head.
24. The system of claim 22 , further comprising rendering spatial audio using the estimated head dimension.
25. The system of claim 22 , wherein the estimated head dimension is used to select or modify a head-related transfer function (HRTF) of a binaural rendering engine.
26. The system of claim 24 , wherein the estimated head dimension is used to calculate a spatial auditory cue used in rendering the spatial audio.