Multi-channel sound panner

• US 20080253577A1
• Filed: 04/13/2007
• Published: 10/16/2008
• Est. Priority Date: 04/13/2007
• Status: Abandoned Application

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Eppolito, Aaron
• Application Number:
  US11/786,863
• Publication Number:
  US 20080253577A1
• Time in Patent Office: Days
• US Class Current: 381/17
• CPC Class Codes: H04S 3/00 Systems employing more than two channels, e.g. quadraphonic H04S5/00, H04S7/00 take precedence
• CPC Class Codes: H04S 7/30 Control circuits for electronic adaptation of the sound field
• CPC Class Codes: H04S 7/40 Visual indication of stereophonic sound image

Abstract

A method and apparatus for multi-channel panning is provided. The panner can support an arbitrary number of input channels and changes to configurations to the output sound space. For example, the panner seamlessly handles changes in the number of input channels. Also, the panner supports changes to the number and positions of speakers in the output space. In one embodiment, the panner allows continuous control of attenuation and collapsing. In one embodiment, the panner keeps source channels on the periphery of the sound space when collapsing channels. In one embodiment, the panner allows control over the path by which sources collapse.

Claims

1. A method comprising:

receiving input requesting re-balancing of a plurality of channels of source audio in a sound space having a plurality of speakers, wherein the plurality of channels of source audio are initially described by an initial position in the sound space and an initial amplitude, and wherein the positions and the amplitudes of the channels defines a balance of the channels in the sound space;

based on the input, determining a new position in the sound space for at least one of the source channels; and

based on the input, determining a modification to the amplitude of at least one of the source channels, wherein the new position and the modification to the amplitude achieves the re-balancing.

2. The method of claim 1, further comprising mapping at least one of the channels to one or more of the speakers, based on the new position and the modification to the amplitude.

3. The method of claim 1, wherein receiving input includes receiving a relative amount by which the positions of the channels should be re-positioned in the sound space to re-balance the channels and a relative amount by which the amplitudes of the channels should be modified to re-balance the channels.

4. The method of claim 1, further comprising displaying, in a visual representation of the sound space, a visual element for each of the channels based at least in part on the new position and the modification to the amplitude.

5. The method of claim 1, wherein determining the new position achieves a first portion of the re-balancing and determining the modification to the amplitude achieves a second portion of the re-balancing.

6. The method of claim 1, wherein the input specifies a reference point in the sound space that is a balancing point for the channels.

7. The method of claim 6, wherein determining the modification to the amplitude is based on a first component for which gain is inversely proportional to the distance of a channel to the reference point and a second component that adds gain to a region of the periphery of the sound space that is nearest to the reference point.

8. A method comprising:

displaying an image that represents a sound space, wherein the image displays a position and an amplitude for each of a plurality of channels of source audio, wherein the positions and the amplitudes of the channels defines a balance of the source channels;

receiving input requesting re-balancing of the source channels,

determining a new position in the sound space for each of the source channels;

based on the input, determining a modification to the amplitude for each of the source channels, wherein the new position and the modification to the amplitude achieves the re-balancing; and

displaying, in the image, a visual representation for each of the source channels based on the new position for each of the source channels and the modification to the amplitude for each of the source channels.

9. The method of claim 8, wherein receiving input includes receiving a relative amount by which the positions of the channels should be re-located in the sound space to re-balance the channels and a relative amount by which the amplitudes of the channels should be modified to re-balance the channels.

10. The method of claim 8, wherein determining the new position achieves a first portion of the re-balancing and determining the modification to the amplitude achieves a second portion of the re-balancing.

11. The method of claim 8, wherein the input specifies a main reference point in the sound space;

and further comprising displaying, in the image, a subordinate reference point for each of the source channels, wherein the location for the subordinate reference point for each of the source channels is based on the location of the main reference point.

12. The method of claim 11, further comprising:

in response to receiving input that specifies a new location for at least one of the subordinate reference points, changing the location at which the main reference point is displayed in the image.

13. A method comprising:

receiving input that defines a new position of a reference point in a sound space, wherein the sound space is defined by a perimeter, and wherein a plurality of channels of source audio are initially described by an initial position on the perimeter of the sound space, and wherein the collective positions of the channels is based on the position of the reference point in the sound space; and

based on the new position of the reference point, determining a new position for at least one of the source channels, wherein the new position is kept substantially along the perimeter of the sound space.

14. The method of claim 13, further comprising mapping a source channel to one or more speakers in the sound space based on the new position of the channel.

15. The method of claim 13, further comprising displaying a visual representation for the at least one channel based on the new position for the at least one channel.

16. The method of claim 13, further comprising:

receiving input that specifies rotation of the channels in the sound space; and

wherein determining the new position is further based on the input that specifies the rotation.

17. The method of claim 16, wherein the determining the new position based on the input that specifies the rotation includes determining a rotation for a first channel that is proportional to distance between speakers in the sound space that are adjacent to the first channel.

18. A method comprising:

displaying an image that represents a sound space, wherein the sound space has a perimeter, and wherein the image displays a position for each of a plurality of channels of source audio, and wherein the collective positions of the channels is based on a position of a reference point in the sound space;

receiving input that defines a new location of the reference point in the sound space;

based on the new location of the reference point, determining a new position for each of the source channels, wherein the new position for each of the source channels is kept substantially along the perimeter of the sound space; and

displaying, in the image, the new position for each of the source channels.

19. A method comprising:

receiving input that affects how each channel of a first set of channels is mapped to a sound space;

transitioning from the first set of channels to a set second set of channels, wherein the first set and the second set have a different number of channels; and

automatically mapping, based on the input, each channel of the set second set of channels to the sound space.

20. The method of claim 19, further comprising:

prior to the transitioning, displaying in the user interface, a visual representation of each channel of the first set of channels in the sound space; and

after the transitioning, displaying in the user interface, a visual representation of each channel of the second set of channels in the sound space.

21. The method of claim 20, wherein displaying the visual representations of the first set of channels and the second set of channels is substantially continuous at the point of transitioning.

22. The method of claim 20, wherein changing the visual representation after the transitioning is performed without user input to request that the number of visual elements change.

23. A method comprising:

receiving input that affects how each channel of a set of channels is mapped to a sound space;

mapping each channel of the set of channels to the sound space; and

in response to a change in the configuration of the sound space, automatically re-mapping the channels to the sound space.

24. The method of claim 23, wherein the change in the configuration of the sound space is a change from a first number of speakers to a second number of speakers.

25. The method of claim 23, wherein the change in the configuration of the sound space is a change in the location of one or more speakers in the sound space.

26. The method of claim 23, wherein the change in the configuration of the sound space is a change in volume of at least one of speakers relative to volume of at least one other speaker.

27. The method of claim 23, further comprising displaying, in a representation of the sound space, a visual element for each of the channels.

28. The method of claim 23, wherein the change in the configuration of the sound space is disabling a speaker in the sound space and wherein automatically re-mapping the channels to the sound space includes re-distributing the sound of the disabled speaker to at least two speakers that are on either side of the disabled speaker.

29. A method comprising:

receiving first input that defines a new position of a reference point in a sound space, and wherein a plurality of channels of source audio are initially described by an initial position in the sound space, and wherein the collective positions of the channels is based on the position of the reference point in the sound space;

receiving second input that specifies a relative amount by which the positions of the channels should be re-positioned in a path along a perimeter of the sound space and a relative amount by which positions of the channels should be re-positioned in a path towards the reference point; and

based on the new position of the reference point and the second input, determining a new position for at least one of the source channels.