Filter selection for delivering spatial audio
Various embodiments relate generally to electrical and electronic hardware, computer software, wired and wireless network communications, and audio and speaker systems. More specifically, disclosed are an apparatus and a method for processing signals for optimizing audio, such as 3D audio, by adjusting the filtering for cross-talk cancellation based on listener position and/or orientation. In one embodiment, an apparatus is configured to include a plurality of transducers, a memory, and a processor configured to execute instructions to determine a physical characteristic of a listener relative to the origination of the multiple channels of audio, to cancel crosstalk in a spatial region coincident with the listener at a first location, to detect a change in the physical characteristic of the listener, and to adjust the cancellation of crosstalk responsive to detecting the change in the physical characteristic to establish another spatial region at a second location.
1. A method comprising:
receiving data representing a position for a region in space adjacent a media device;
selecting a filter configured to project spatial audio to the region in space;
generating a first channel of the spatial audio;
propagating the first channel of the spatial audio from a first subset of transducers to the region in space;
generating a second channel of the spatial audio;
propagating the second channel of the spatial audio from a second subset of transducers to the region in space;
generating probe signals;
propagating a first subset of the probe signals via the first subset of transducers;
propagating a second subset of the probe signals via the second subset of transducers;
receiving a first subset of data associated with a first point in the region of space, the first subset of data describing a location of the first point as a function of the first and the second subsets of the probe signals; and
receiving a second subset of data associated with a second point in the region of space, the second subset of data describing a location of the second point as a function of the first and the second subsets of the probe signals.
2. The method of claim 1 , wherein receiving the data representing the position comprises:
receiving data representing an angle.
3. The method of claim 1 , wherein selecting the filter comprises:
identifying the filter associated with the position; and
selecting the filter from a plurality of filters, each of which is associated with a different position.
4. The method of claim 1 , wherein receiving the data representing the position comprises:
determining the position is between a first position and a second position;
identifying a first filter associated with the first position;
identifying a second filter associated with the second position;
interpolating filter parameters based on the first filter and the second filter to form interpolated filter parameters; and
generating the first channel and the second channel of the spatial audio based on the interpolated filter parameters.
5. The method of claim 4 , further comprising:
detecting a rate of change of the position;
interpolating the filter parameters at the rate of change; and
propagating the first and the second channels of the spatial audio at the rate of change.
6. The method of claim 1 , wherein generating the probe signals comprises:
generating acoustic probe signals.
7. The method of claim 1 , further comprising:
receiving the first subset of data and the second subset of data via either an electronic communications link or an ultrasonic communications link, or both.
8. The method of claim 1 , wherein the first point and the second point are associated with a first microphone and a second microphone, respectively.
9. The method of claim 1 wherein receiving the data representing the position comprises:
receiving data representing an angle generated responsive to a user input accepted on a user interface disposed at the region of space.
10. The method of claim 1 , further comprising:
receiving data representing another position for another region in the space adjacent the media device;
selecting another filter configured to project the spatial audio to the another region in space;
propagating the first channel of the spatial audio from a third subset of transducers to the another region in space; and
propagating the second channel of the spatial audio from a fourth subset of transducers to the another region in space.
11. The method of claim 7 , wherein receiving the data representing the position for the region comprises:
receiving the data associated with the position via either an image capture device or an ultrasonic signal, or both.
12. The method of claim 7 , wherein propagating the first channel of the spatial audio and propagating the second channel of the spatial audio comprises:
propagating the spatial audio via a left channel; and
propagating the spatial audio via a right channel, respectively.
13. A method comprising:
receiving data representing a position for a region in space adjacent a media device;
selecting a filter configured to project spatial audio to the region in space;
generating a first channel of the spatial audio;
propagating the first channel of the spatial audio from a first subset of transducers to the region in space;
generating a second channel of the spatial audio;
propagating the second channel of the spatial audio from a second subset of transducers to the region in space;
generating probe signals;
propagating a first subset of the probe signals via the first subset of transducers;
propagating a second subset of the probe signals via the second subset of transducers;
receiving a first subset of data associated with a first point in the region of space, the first subset of data describing a location of the first point as a function of the first and the second subsets of the probe signals;
receiving a second subset of data associated with a second point in the region of space, the second subset of data describing a location of the second point as a function of the first and the second subsets of the probe signals; and
receiving the first subset of data and the second subset of data via either an electronic communications link or an ultrasonic communications link, or both.
14. The method of claim 13 , wherein receiving the data representing the position comprises:
receiving data representing an angle.
15. The method of claim 13 , wherein selecting the filter comprises:
identifying the filter associated with the position; and
selecting the filter from a plurality of filters, each of which is associated with a different position.
16. A method comprising:
receiving data representing a position for a region in space adjacent a media device;
selecting a filter configured to project spatial audio to the region in space;
generating a first channel of the spatial audio;
propagating the first channel of the spatial audio from a first subset of transducers to the region in space;
generating a second channel of the spatial audio;
propagating the second channel of the spatial audio from a second subset of transducers to the region in space;
generating probe signals;
propagating a first subset of the probe signals via the first subset of transducers;
propagating a second subset of the probe signals via the second subset of transducers;
receiving a first subset of data associated with a first point in the region of space, the first subset of data describing a location of the first point as a function of the first and the second subsets of the probe signals; and
receiving a second subset of data associated with a second point in the region of space, the second subset of data describing a location of the second point as a function of the first and the second subsets of the probe signals,
wherein the first point and the second point are associated with a first microphone and a second microphone, respectively.
17. The method of claim 16 , wherein receiving the data representing the position comprises:
receiving data representing an angle.
18. The method of claim 16 , wherein selecting the filter comprises:
identifying the filter associated with the position; and
selecting the filter from a plurality of filters, each of which is associated with a different position.