Emphasis for audio spatialization

1. A method of presenting an audio signal to a user of a wearable head device, the method comprising:

receiving a first input audio signal, the first input audio signal associated with a virtual environment presented on a display of the wearable head device;

processing the first input audio signal to generate a first output audio signal, the first output audio signal associated with the virtual environment, wherein processing the first input audio signal comprises:

applying a pre-emphasis filter to the first input audio signal;

adjusting a gain of the first input audio signal; and

applying a de-emphasis filter to the first input audio signal; and

presenting the first output audio signal via one or more speakers associated with the wearable head device,

wherein:

applying the pre-emphasis filter to the first input audio signal comprises attenuating a low frequency component of the first input audio signal, and

applying the de-emphasis filter to the first input audio signal comprises attenuating a high frequency component of the first input audio signal.

2. The method of claim 1 , wherein the pre-emphasis filter comprises a first derivative filter.

3. The method of claim 2 , wherein the first derivative filter has a per-octave roll off of approximately six decibels.

4. The method of claim 1 , wherein applying the de-emphasis filter to the first input audio signal further comprises maintaining or increasing an amplitude of a low frequency component of the first input audio signal.

5. The method of claim 1 , wherein the de-emphasis filter comprises an integrator filter.

6. The method of claim 1 , wherein the de-emphasis filter comprises a leaky integrator with a per-octave boost of approximately six decibels.

7. The method of claim 1 , wherein the de-emphasis filter comprises a DC blocking filter.

8. The method of claim 1 , further comprising receiving a second input audio signal,

wherein:

processing the first input audio signal to generate the first output audio signal further comprises mixing, via a mixer, the first input audio signal with the second input audio signal.

9. The method of claim 1 , wherein presenting the first output audio signal via one or more speakers of the wearable head device comprises:

applying a first head-related transfer function (HRTF) to the first output audio signal;

presenting the output of the first HRTF to a left speaker of the one or more speakers of the wearable head device;

applying a second HRTF to the first output audio signal; and

presenting the output of the second HRTF to a right speaker of the one or more speakers of the wearable head device.

10. The method of claim 1 , wherein processing the first input audio signal to generate the first output audio signal further comprises:

applying an output of the pre-emphasis filter to one or more filters;

panning a first output of the one or more filters to generate a first panned signal, a second panned signal, a third panned signal, and a fourth panned signal;

applying the first panned signal to a left bus;

applying the second panned signal to a right bus;

applying the third panned signal to a standard bus;

applying the fourth panned signal to a diffuse bus; and

applying the left bus, the right bus, the standard bus, and the diffuse bus as input to a virtualizer,

wherein applying the de-emphasis filter to the first audio signal comprises applying the de-emphasis filter to the output of the virtualizer.

11. The method of claim 10 , wherein processing the first input audio signal to generate the first output audio signal further comprises applying a pre-delay to the first panned signal and the second panned signal.

12. The method of claim 10 , wherein processing the first input audio signal to generate the first output audio signal further comprises applying a decorrelation filter to the diffuse bus.

13. The method of claim 10 , wherein processing the first input audio signal to generate the first output audio signal further comprises applying a second output of the one or more filters as input to a clustered reflections module, and applying the output of the clustered reflections module to the standard bus.

14. The method of claim 10 , wherein processing the first input audio signal to generate the first output audio signal further comprises applying a second output of the one or more filters as input to a reverb module, and applying the output of the reverb module to the standard bus.

15. The method of claim 10 , wherein the one or more filters comprises a distance filter.

16. The method of claim 10 , wherein the one or more filters comprises an air absorption filter.

17. The method of claim 10 , wherein the one or more filters comprises a source directivity filter.

18. The method of claim 10 , wherein the one or more filters comprises an occlusion filter.

19. The method of claim 10 , wherein the one or more filters comprises an obstruction filter.

20. A system comprising:

a wearable head device;

one or more speakers;

one or more processors configured to execute a method comprising:

receiving a first input audio signal, the first input audio signal associated with a virtual environment presented on a display of the wearable head device;

processing the first input audio signal to generate a first output audio signal, the first output audio signal associated with the virtual environment, wherein processing the first input audio signal comprises:

applying a pre-emphasis filter to the first input audio signal;

adjusting a gain of the first input audio signal; and

applying a de-emphasis filter to the first input audio signal; and

presenting the first output audio signal via the one or more speakers,

wherein:

applying the pre-emphasis filter to the first input audio signal comprises attenuating a low frequency component of the first input audio signal, and

applying the de-emphasis filter to the first input audio signal comprises attenuating a high frequency component of the first input audio signal.

21. The system of claim 20 , wherein the pre-emphasis filter comprises a first derivative filter.

22. The system of claim 21 , wherein the first derivative filter has a per-octave roll off of approximately six decibels.

23. The system of claim 20 , wherein applying the de-emphasis filter to the first input audio signal further comprises maintaining or increasing an amplitude of a low frequency component of the first input audio signal.

24. The system of claim 20 , wherein the de-emphasis filter comprises an integrator filter.

25. The system of claim 20 , wherein the de-emphasis filter comprises a leaky integrator with a per-octave boost of approximately six decibels.

26. The system of claim 20 , wherein the de-emphasis filter comprises a DC blocking filter.

27. The system of claim 20 , the method further comprising receiving a second input audio signal, wherein:

processing the first input audio signal to generate the first output audio signal further comprises mixing, via a mixer, the first input audio signal with the second input audio signal.

28. The system of claim 20 , wherein presenting the first output audio signal via one or more speakers of the wearable head device comprises:

applying a first head-related transfer function (HRTF) to the first output audio signal;

presenting the output of the first HRTF to a left speaker of the one or more speakers of the wearable head device;

applying a second HRTF to the first output audio signal; and

presenting the output of the second HRTF to a right speaker of the one or more speakers of the wearable head device.

29. The system of claim 20 , wherein processing the first input audio signal to generate the first output audio signal further comprises:

applying an output of the pre-emphasis filter to one or more filters;

panning a first output of the one or more filters to generate a first panned signal, a second panned signal, a third panned signal, and a fourth panned signal;

applying the first panned signal to a left bus;

applying the second panned signal to a right bus;

applying the third panned signal to a standard bus;

applying the fourth panned signal to a diffuse bus; and

applying the left bus, the right bus, the standard bus, and the diffuse bus as input to a virtualizer,

wherein applying the de-emphasis filter to the first audio signal comprises applying the de-emphasis filter to the output of the virtualizer.

30. The system of claim 29 , wherein processing the first input audio signal to generate the first output audio signal further comprises applying a pre-delay to the first panned signal and the second panned signal.

31. The system of claim 29 , wherein processing the first input audio signal to generate the first output audio signal further comprises applying a decorrelation filter to the diffuse bus.

32. The system of claim 29 , wherein processing the first input audio signal to generate the first output audio signal further comprises applying a second output of the one or more filters as input to a clustered reflections module, and applying the output of the clustered reflections module to the standard bus.

33. The system of claim 29 , wherein processing the first input audio signal to generate the first output audio signal further comprises applying a second output of the one or more filters as input to a reverb module, and applying the output of the reverb module to the standard bus.

34. The system of claim 29 , wherein the one or more filters comprises a distance filter.

35. The system of claim 29 , wherein the one or more filters comprises an air absorption filter.

36. The system of claim 29 , wherein the one or more filters comprises a source directivity filter.

37. The system of claim 29 , wherein the one or more filters comprises an occlusion filter.

38. The system of claim 29 , wherein the one or more filters comprises an obstruction filter.

39. A non-transitory computer-readable medium storing instructions, which when executed by one or more processors cause the one or more processors to perform a method of presenting an audio signal to a user of a wearable head device, the method comprising:

receiving a first input audio signal, the first input audio signal associated with a virtual environment presented on a display of the wearable head device;

processing the first input audio signal to generate a first output audio signal, the first output audio signal associated with the virtual environment, wherein processing the first input audio signal comprises:

applying a pre-emphasis filter to the first input audio signal;

adjusting a gain of the first input audio signal; and

applying a de-emphasis filter to the first input audio signal; and

presenting the first output audio signal via one or more speakers associated with the wearable head device,

wherein:

applying the pre-emphasis filter to the first input audio signal comprises attenuating a low frequency component of the first input audio signal, and

applying the de-emphasis filter to the first input audio signal comprises attenuating a high frequency component of the first input audio signal.

40. The non-transitory computer-readable medium of claim 39 , wherein the pre-emphasis filter comprises a first derivative filter.

41. The non-transitory computer-readable medium of claim 40 , wherein the first derivative filter has a per-octave roll off of approximately six decibels.

42. The non-transitory computer-readable medium of claim 39 , wherein applying the de-emphasis filter to the first input audio signal further comprises maintaining or increasing an amplitude of a low frequency component of the first input audio signal.

43. The non-transitory computer-readable medium of claim 39 , wherein the de-emphasis filter comprises an integrator filter.

44. The non-transitory computer-readable medium of claim 39 , wherein the de-emphasis filter comprises a leaky integrator with a per-octave boost of approximately six decibels.

45. The non-transitory computer-readable medium of claim 39 , wherein the de-emphasis filter comprises a DC blocking filter.

46. The non-transitory computer-readable medium of claim 39 , the method further comprising receiving a second input audio signal,

wherein:

processing the first input audio signal to generate the first output audio signal further comprises mixing, via a mixer, the first input audio signal with the second input audio signal.

47. The non-transitory computer-readable medium of claim 39 , wherein presenting the first output audio signal via one or more speakers of the wearable head device comprises:

applying a first head-related transfer function (HRTF) to the first output audio signal;

presenting the output of the first HRTF to a left speaker of the one or more speakers of the wearable head device;

applying a second HRTF to the first output audio signal; and

presenting the output of the second HRTF to a right speaker of the one or more speakers of the wearable head device.

48. The non-transitory computer-readable medium of claim 39 , wherein processing the first input audio signal to generate the first output audio signal further comprises:

applying an output of the pre-emphasis filter to one or more filters;

panning a first output of the one or more filters to generate a first panned signal, a second panned signal, a third panned signal, and a fourth panned signal;

applying the first panned signal to a left bus;

applying the second panned signal to a right bus;

applying the third panned signal to a standard bus;

applying the fourth panned signal to a diffuse bus; and

applying the left bus, the right bus, the standard bus, and the diffuse bus as input to a virtualizer,

wherein applying the de-emphasis filter to the first audio signal comprises applying the de-emphasis filter to the output of the virtualizer.

49. The non-transitory computer-readable medium of claim 48 , wherein processing the first input audio signal to generate the first output audio signal further comprises applying a pre-delay to the first panned signal and the second panned signal.

50. The non-transitory computer-readable medium of claim 48 , wherein processing the first input audio signal to generate the first output audio signal further comprises applying a decorrelation filter to the diffuse bus.

51. The non-transitory computer-readable medium of claim 48 , wherein processing the first input audio signal to generate the first output audio signal further comprises applying a second output of the one or more filters as input to a clustered reflections module, and applying the output of the clustered reflections module to the standard bus.

52. The non-transitory computer-readable medium of claim 48 , wherein processing the first input audio signal to generate the first output audio signal further comprises applying a second output of the one or more filters as input to a reverb module, and applying the output of the reverb module to the standard bus.

53. The non-transitory computer-readable medium of claim 48 , wherein the one or more filters comprises a distance filter.

54. The non-transitory computer-readable medium of claim 48 , wherein the one or more filters comprises an air absorption filter.

55. The non-transitory computer-readable medium of claim 48 , wherein the one or more filters comprises a source directivity filter.

56. The non-transitory computer-readable medium of claim 48 , wherein the one or more filters comprises an occlusion filter.

57. The non-transitory computer-readable medium of claim 48 , wherein the one or more filters comprises an obstruction filter.