Multi-element directional acoustic arrays

1. An audio system, comprising:

at least three acoustic drivers, arranged substantially in a line in a single enclosure, and separated by a non-uniform distance;

a first interference directional array, comprising

a first subset of the plurality of acoustic drivers, for directionally radiating one of a left channel audio signal and a right channel audio signal; and

signal processing circuitry to process audio signals to the first subset of acoustic drivers so that radiation from each of the acoustic drivers interferes destructively so that radiation in a direction toward a listening location is less than radiation in other directions; and

a second interference directional array, comprising a second subset of the plurality of acoustic drivers, for directionally radiating the other of a left channel audio and a right channel audio signal; and

signal processing circuitry to process audio signals to the second subset of acoustic drivers so that radiation from each of the acoustic drivers interferes destructively so that radiation in a direction toward a listening location is less than radiation in other directions;

the first subset and the second subset comprising at least one common acoustic driver, and the first subset including an acoustic driver not included by the second subset, and the second subset including an acoustic driver not included by the first subset.

2. An audio system according to claim 1 , wherein the distance between the two outside leftmost acoustic drivers of the first directional array is less than the distance between any other two of the acoustic drivers of the first directional array and wherein the distance between the two rightmost acoustic drivers of the second directional array is less than the distance between any other two acoustic drivers of the second directional array.

3. An audio system according to claim 1 , wherein the radiating surfaces of the acoustic drivers face upwardly.

4. An audio system according to claim 3 , wherein the radiating surfaces of the acoustic drivers face upwardly and backwardly.

5. An audio system according to claim 1 , wherein the radiating surface of the leftmost acoustic driver faces outwardly.

6. An audio system according to claim 1 , further comprising an acoustically opaque barrier in front of the acoustic drivers.

7. An audio system according to claim 1 , implemented in a television.

8. An audio system according to claim 1 , further comprising:

a third interference directional array, comprising

a third subset of the plurality of acoustic drivers in the single enclosure, for directionally radiating a center channel audio signal, the third subset including at least one acoustic driver not included by the first subset, at least one acoustic driver not included by the second subset, at least one acoustic driver in common with the first subset and at least one acoustic driver in common with the second subset; and

signal processing circuitry to process audio signals to the third subset of acoustic drivers so that radiation from each of the acoustic drivers interferes destructively so that radiation in one direction is less than radiation in other directions.

9. A television, comprising an audio device, comprising:

at least three acoustic drivers, arranged substantially in a line in a common enclosure, and separated by a non-uniform distance;

a first interference directional array, comprising

a first subset of the plurality of acoustic drivers, for directionally radiating one of a left channel audio signal and a right channel audio signal; and

signal processing circuitry to process audio signals to the first subset of acoustic drivers so that radiation from each of the acoustic drivers interferes destructively so that radiation in a direction toward a listening location is less than radiation in other directions; and

a second interference directional array, comprising a second subset of the plurality of acoustic drivers, for directionally radiating the other of a left channel audio and a right channel audio signal; and

signal processing circuitry to process audio signals to the second subset of acoustic drivers so that radiation from each of the acoustic drivers interferes destructively so that radiation in a direction toward a listening location is less than radiation in other directions;

the first subset and the second subset comprising at least one common acoustic driver, and the first subset including at least one acoustic driver not included by the first subset and the second subset including at least on acoustic driver not included by the first subset.

10. A television according to claim 9 , wherein the distance between the two leftmost acoustic drivers of the first directional array is less than the distance between any other two of the acoustic drivers of the first directional array and wherein the distance between the two rightmost acoustic drivers of the second directional array is less than the distance between any other two acoustic drivers of the second directional array.

11. A television system according to claim 9 , wherein the radiating surfaces of the acoustic drivers face upwardly.

12. A television system according to claim 11 , wherein the radiating surfaces of the acoustic drivers face upwardly and backwardly.

13. A television system according to claim 9 , wherein the radiating surface of the leftmost acoustic driver faces outwardly.

14. A television system according to claim 9 , further comprising an acoustically opaque barrier in front of the acoustic drivers.

15. A television system according to claim 9 , further comprising:

a first interference directional array, comprising

a third subset of the plurality of acoustic drivers, for directionally radiating a center channel audio signal; and

signal processing circuitry to process audio signals to the third subset of acoustic drivers so that radiation from each of the acoustic drivers interferes destructively so that radiation in one direction is less than radiation in other directions.