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Автоматизированный перевод
1. (WO2017203011) SYSTEMS AND METHODS FOR IMPROVING AUDIO VIRTUALISATION
Примечание: Текст, основанный на автоматизированных процессах оптического распознавания знаков. Для юридических целей просьба использовать вариант в формате PDF

CLAIMS:

1. A digital signal processing method for creating binaural room impulse response data, the method comprising:

providing data representing a personalised binaural room impulse response, said personalised binaural impulse response being created in respect of a target listener;

providing data representing a non-personalised binaural room impulse response, said non-personalised binaural impulse response being created in respect of a dummy or a person other than the target listener; and

using said personalised binaural impulse response data and said non-personalised binaural impulse response data to create data representing a hybrid binaural room impulse response,

2. The method of claim 1 wherein said data comprises a plurality of portions, each portion representing a different aspect of said respective binaural room impulse response, and wherein creating said hybrid binaural room impulse response data involves using at least one portion of said personalised binaural room impulse response data to provide the or each corresponding portion of said hybrid binaural room impulse response data, and by using at least one other portion of said non-personalised binaural room impulse response data to provide the or each other corresponding portion of said hybrid binaural room impulse response data.

3. The method of claim 2, wherein said plurality of portions comprise a first portion representing a portion of the respective binaural room impulse response that is independent of a room which said respective binaural room impulse response represents, and wherein creating said hybrid binaural room impulse response data involves using the first portion of said personalised binaural room impulse response data to provide the first portion of said hybrid binaural room impulse response data.

4. The method of claim 3, wherein said first portion comprises data representing a head related impulse response (HRIR) portion of the respective binaural room impulse response, and wherein said HRIR portion of said personalised binaural room impulse response data is used to provide the HRIR portion of said hybrid binaural room impulse response data.

5. The method of claim 4, wherein the HRIR data portion comprises data representing one or more frequency components of the HRIR portion of the personalised binaural room impulse response.

6. The method of claim 4 or 5, including filtering, preferably high pass filtering or band pass filtering, said HRIR data portion of said personalised binaural room impulse response, and using said filtered HRIR data portion to provide the HRIR portion of said hybrid binaural room impulse response data.

7. The method of any one of claims 3 to 6, including overwriting said first portion of said non-personalised binaural room impulse response data with the first portion of said personalised binaural room impulse response data to creating said hybrid binaural room impulse response data.

8. The method of claim 7, including filtering, preferably high pass filtering or band pass filtering, the respective first portion of each of said personalised and non-personalised binary room impulse response data prior to said overwriting.

9. The method of any preceding claim wherein the respective binaural room impulse response data comprises data representing an inter-aural time delay, and wherein the inter-aural time delay data of said personalised binaural room impulse response is used to provide the inter-aural time delay data of said hybrid binaural room impulse response data.

10. The method of any preceding claim wherein the respective binaural room impulse response data includes at least one portion representing a portion of the respective binaural room impulse response that is dependent on a room that the respective binaural room impulse response represents, and wherein creating said hybrid room impulse response data involves modifying at least one room-dependent portion of said non-personalised binaural room impulse response data using an omnidirectional head transfer function (HRTF) of said personalised binaural room impulse response data and an omni-directional head transfer function (HRTF) of said non-personalised binaural room impulse response data, and using said at least one modified room dependent portion in said hybrid binaural room impulse response data.

1 1. The method of claim 10 wherein said modifying involves filtering said at least one room-dependent portion of said non-personalised binaural room impulse data using a filter representing the difference between said omni-directional head transfer functions.

12. The method of claim 1 1 wherein said filtering comprises equalisation filtering and said filter comprises an equalisation filter.

13. The method of claim 1 1 or 12, wherein the difference between said omni-directional head transfer functions is determined by digital signal analysis of said omni-directional head transfer functions.

14. The method of claim 1 1 or 12, wherein the difference between said omni-directional head transfer functions is determined empirically by performing a comparative listening test, said listening test preferably involving comparing, by listening to, a test audio signal processed by the first portion of said non-personalised binaural room impulse data and the test audio signal processed by the first portion of said personalised binaural room impulse data, and adjusting, preferably by adjustably filtering, said test audio signal processed by the first portion of said non-personalised binaural room impulse data to match the test audio signal processed by the first portion of said personalised binaural room impulse data.

15. The method of any one of claims 10 to 14 wherein said at least one room dependent portion comprises data representing a reflections portion and a reverberation portion of the respective binaural room impulse response, and wherein said data representing at least one of said reflections portion and said reverberation portion is modified using said omni-directional head transfer functions.

16. The method of any one of claims 2 to 15, wherein said plurality of portions comprise at least one room-dependent portion that is dependent on a room which the respective binaural room impulse response represents, and wherein said personalised binaural room impulse response is created in a first room, typically having relatively poor acoustic characteristics, and said non-personalised binaural room impulse response is created in a second room, typically having better acoustic characteristics than said first room, and wherein one or more one room-dependent portion of said non-personalised binaural room impulse response data is used to provide the or each corresponding room-dependent portion of said hybrid binaural room impulse response data.

17. The method of claim 16, wherein creating said hybrid binaural room impulse data involves using said one or more one room-dependent portion of said non-personalised binaural room impulse response data to modify the or each corresponding room-dependent portion of said personalised binaural room impulse response data.

18. The method of claim 16 or 17, wherein data representing a reflections portion and/or a reverberation portion of the non-personalised binaural room impulse response is used to provide the or each corresponding portion of the hybrid binaural room impulse response data.

19. The method of any one of claims 16 to 18, wherein said at least one room-dependent portion comprises data representing at least one characteristic of a reverberation portion of said non-personalised binaural room impulse response, and wherein creating said hybrid binaural room impulse response data involves using said data representing at least one reverberation characteristic of said non-personalised binaural room impulse response to provide data representing the or each corresponding characteristic of a reverberation portion of said hybrid binaural room impulse response.

20. The method of any one of claims 16 to 19, wherein said at least one room-dependent portion comprises data representing at least one characteristic of a reflection portion of said non-personalised binaural room impulse response, and wherein creating said hybrid binaural room impulse response data involves using said data representing at least one reflection characteristic of said non-personalised binaural room impulse response to provide data representing the or each corresponding characteristic of a reflection portion of said hybrid binaural room impulse response.

21. The method of claim 19 or 20, wherein said at least one characteristic is a time decay profile and/or a gain.

22. The method of any preceding claim wherein creating said hybrid binaural room impulse response data involves modifying said non-personalised binaural room impulse response with one or more aspect of said personalised binaural room impulse response that is independent of a room in which said personalised binaural room impulse response is created, and using said modified non-personalised binaural room impulse response as said hybrid binaural room impulse response.

23. The method of any one of claims 1 to 21 , wherein creating said hybrid binaural room impulse response data involves modifying said personalised binaural room impulse response with one or more aspect of said non-personalised binaural room impulse response that is dependent on a room in which said non-personalised binaural room impulse response is created, and using said modified personalised binaural room impulse response as said hybrid binaural room impulse response.

24. The method of claim 23, wherein said at least one room-dependent portion comprises data representing at least one reverberation characteristic of said non-personalised binaural room impulse response.

25. The method of any one of claims 19 to 21 or 24 wherein said at least one characteristic comprises one or more time characteristic and one or more frequency characteristic, preferably one or more frequency response characteristic and one or more time decay characteristic.

26. The method of any one of claims 16 to 25, wherein providing the or each corresponding room-dependent portion of said hybrid binaural room impulse response data involves performing digital signal analysis of the respective room-dependent portion of the non-personalised binaural room impulse response data and the personalised binaural room impulse response data, for example using sub-band analysis filter banks.

27. The method of any one of claims 16 to 24, wherein providing the or each corresponding room-dependent portion of said hybrid binaural room impulse response data involves performing a comparative listening test.

28. The method of any preceding claim including creating a hybrid binaural room impulse data set comprising respective hybrid binaural room impulse data for each of a plurality of loudspeaker-to-head orientations.

29. A digital signal processing method for modifying data representing a binaural room impulse response, said data including data representing a reflections portion and/or a reverberation portion of said binaural room impulse response, said method comprising modifying said data to modify at least one characteristic, preferably frequency response and/or time decay characteristics, of said reflections portion and/or of said reverberation portion.

30. The method of claim 29, wherein said at least one characteristic is modified to conform to the or each corresponding characteristic of the respective portion of a reference binaural room impulse response, for example a personalised or non-personalised binaural room impulse response or a hybrid binaural room impulse response.

31. The method of claim 30 wherein said modification to conform involves performing digital signal analysis of data representing said binaural room impulse response and data representing said reference binaural room impulse response.

32. The method of claim 30 wherein said modification to conform is performed empirically by performing a comparative listening test between an audio signal rendered using said binaural room impulse response data and using said reference binaural room impulse response data.

33. The method of claim 29 wherein said modifying is performed empirically according to a listener's preference.

34. The method of any one of claims 29 to 33, including performing sub-band analysis of all or part of said binaural room impulse response data, and wherein said modifying involves modifying said at least one characteristic of one or more of the resulting sub-band data, and synthesising the sub-band data, including any modified sub-band data.

35. The method of any one of claims 29 to 34 wherein said at least one characteristic comprises a gain and/or decay envelope characteristic.

36. The method of any one of claims 29 to 34 wherein said modifying is performed in real-time during audio virtualisation of an audio signal using said binaural room impulse response data.

37. A digital signal processing apparatus for creating binaural room impulse response data, said apparatus comprising digital signal processing means for:

providing data representing a personalised binaural room impulse response, said personalised binaural impulse response being created in respect of a target listener;

providing data representing a non-personalised binaural room impulse response, said non-personalised binaural impulse response being created in respect of a dummy or a person other than the target listener; and

using said personalised binaural impulse response data and said non-personalised binaural impulse response data to create data representing a hybrid binaural room impulse response.

38. The digital signal processing apparatus of claim 37 comprising digital signal processing means for performing the method of any of one of claims 2 to 28.

39. A digital signal processing apparatus for modifying data representing a binaural room impulse response, the apparatus comprising digital signal processing means for performing the method of any one of claims 29 to 36.

40. An audio virtualisation method, the method comprising creating binaural room impulse response data using the method of any one of claims 1 to 36; transforming an audio signal into a virtualised audio signal using said binaural room impulse response data; and rendering said virtualised audio signal to a listener.

41 . An audio virtualisation system comprising the digital signal processing apparatus as claimed in any one of claims 37 to 39; digital signal processing means for transforming an audio signal into a virtualised audio signal using said binaural room impulse response data; and headphones for rendering said virtualised audio signal to a listener.