Multi-element directional acoustic arrays

• US 8,265,310 B2
• Filed: 03/03/2010
• Issued: 09/11/2012
• Est. Priority Date: 03/03/2010
• Status: Active Grant

• Current Assignee: Bose Corporation
• Original Assignee: Bose Corporation
• Inventors: Berardi, William, Lehnert, Hilmar
• Primary Examiner(s): Mei, Xu
• Assistant Examiner(s): LAO, LUNSEE
• Application Number:
  US12/716,309
• Publication Number:
  US 20110216924A1
• Time in Patent Office: 923 Days
• Field of Search: 381/300, 381/332, 381/333, 381/302, 381/339, 381/98, 381/99, 381/86, 381 57- 59, 381/150, 381/182, 381/1, 381/17, 381/18, 381/335, 181/175, 181/198, 181/199
• US Class Current: 381/300
• CPC Class Codes: H04R 1/403 loud-speakers
• CPC Class Codes: H04R 2201/403 Linear arrays of transducers
• CPC Class Codes: H04R 2203/12 Beamforming aspects for stereophonic sound reproduction with loudspeaker arrays
• CPC Class Codes: H04R 2205/022 Plurality of transducers corresponding to a plurality of sound channels in each earpiece of headphones or in a single enclosure
• CPC Class Codes: H04R 2499/15 Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops
• CPC Class Codes: H04R 3/12 for distributing signals to two or more loudspeakers specially adapted for hearing aids H04R25/407
• CPC Class Codes: H04R 5/02 Spatial or constructional arrangements of loudspeakers
• CPC Class Codes: H04S 3/002 Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution control circuits for electronic adaptation of the sound field H04S7/30

Abstract

An audio system that may be implemented in a television, that includes a plurality of directional arrays. The arrays may include a common acoustic driver and may be spaces non-uniformly.

Claims

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.