WO2005111908A1

WO2005111908A1 - Prismatic loudspeaker/microphone array

Info

Publication number: WO2005111908A1
Application number: PCT/US2004/011034
Authority: WO
Inventors: Dean E. Johnson
Original assignee: Johnson Dean E
Priority date: 2004-04-12
Filing date: 2004-04-12
Publication date: 2005-11-24

Abstract

An audio array (10) for receiving or generating audio signals. The audio array (10) includes first, second and third audio elements (14, 16 and 18) and first second and third structures (20, 22 and 24). Each of the first second and third structures (20, 22 and 24) are right triangles. The first second and third audio elements (14, 16 and 18) are each secured to a respective one of the first, second and third structures and the first, second and third structures are positioned to extend at a substantially 90o angle to each other. The first second and third audio elements are positioned in a substantially central location of the first second and third structures (20, 22 and 24). The first second and third audio elements (14, 16, 18) are all either speakers or microphones. The first, second and third structures (20, 22 and 24) are all retained within a comprising a housing.

Description

PRTSMATTC! T TinSPFAKFR/MTrROPHONF ARRAY

Description

Technical Field

The present invention relates generally to microphones and loudspeakers and, more specifically, to a speaker/microphone array able to provide a uniform response, maintaining a constant Q with rising frequencies and microphone elements arranged in an annular 90°-90°-90° prismatic array to give a substantially 9dB forward gain without lobing or frequency drop offs within the 90°-90°-90° pattern.

Disclosure of the Invention

The present invention relates generally to microphones and loudspeakers and, more specifically, to a speaker microphone array able to provide a uniform response, maintaining a constant Q with rising frequencies and microphone elements arranged to give a similar response throughout the 90°-90°-90° pattern.

A primary object of the present invention is to provide an audio speaker/microphone array that will overcome the shortcomings of prior art devices, e.g. rising Q with frequency and varying frequency response with angle.

Another object of the present invention is to provide an audio speaker/microphone array which is able to provide a uniform response with increasing audio signal frequencies.

A further object of the present invention is to provide an audio speaker/microphone array which is able to eliminate lobing and beaming of frequencies.

A yet further object of the present invention is to provide an audio speaker/microphone array wherein the speakers forming the array are arranged at 90° to each other. A still further object of the present invention is to provide an audio speaker/microphone array including three speakers or microphones in a 90°-90°-90° array provide same frequency response at all points within the radiation reception pattern of the cluster.

A further object of the present invention is to provide an audio speaker/microphone array wherein the relationship between the speakers/microphone elements minimizes the directional effects of the speakers/microphone elements at a wide range of frequencies.

An even further object of the present invention is to provide an audio speaker/microphone array wherein the clustering of the microphone elements in a 90°-90°- 90° array provides a Q of 8.

A yet further object of the present invention is to provide an audio speaker/microphone array wherein the clustering of the microphone elements are in a prismatic array such as in a transmitter or receiver antenna.

A still further object of the present invention is to provide an audio speaker/microphone array wherein the microphone clustering provides a 9dB forward gain over a single microphone with no lobing or frequency drop offs within the 90°-90°-90° reception pattern.

Another object of the present invention is to provide an audio speaker/microphone array that is simple and easy to use.

A still further object of the present invention is to provide an audio speaker/microphone array that is economical in cost to manufacture.

Additional objects of the present invention will appear as the description proceeds. An audio array for receiving or generating audio signals is disclosed by the present invention. The audio array includes first, second and third audio elements and first second and third structures. Each of the first second and third structures are right triangles. The first second and third audio elements are each secured to a respective one of the first, second and third structures and the first, second and third structures are positioned to extend at a substantially 90° angle to each other.

The first second and third audio elements are positioned in a substantially central location of the first second and third structures. The first second and third audio elements are all either speakers or microphones. The first, second and third structures are all retained within a comprising a housing.

Brief Description of the Drawing Figures

In order that the invention may be more fully understood, it will now be described, by way of example, with reference to the accompanying drawings in which:

FIGURE 1 is a front view of the audio speaker/microphone array of the present invention contained within a speaker cabinet;

FIGURE 2 is side perspective view of the audio speaker/microphone array of the present invention outside of the speaker cabinet;

FIGURE 3 is a back view of the audio speaker/microphone array of the present invention showing all three speakers of the array;

FIGURE 4 is a cross-sectional view of the audio speaker/microphone array of the present invention taken along the line 4-4 of Figure 1;

FIGURE 5 is a cross-sectional view of the audio speaker/microphone array of the present invention taken along the line 5-5 of Figure 1; FIGURE 6 is a cross-sectional view of the audio speaker/microphone array of the present invention taken along the line 6-6 of Figure 1;

FIGURE 7 is a top side view of the audio speaker/microphone array of the present invention used in a microphone showing the position of microphone elements; and

FIGURE 8 is a side perspective view of a microphone including the audio speaker/microphone array of the present invention.

The reference numbers utilized in the drawing figures are defined as follows:

10 audio speaker array of the present invention

12 speaker cabinet housing audio speaker/microphone array

14 first speaker of audio speaker/microphone array

16 second speaker of audio speaker/microphone array

18 third speaker of audio speaker/microphone array

20 structure for maintaining first speaker in position

22 structure for maintaining second speaker in position

24 structure for maintaining third speaker in position

26 right angle between structures for second and third speakers

28 right angle between structures for first and third speakers right angle between structures for first and second speakers

point at which first, second and third structures meet

right angle of the first structure

open side of the cabinet

right angle of the second structure

cover

right angle of the third structure

retaining clips

front side of speaker cabinet

microphone array of the present invention

microphone

first microphone element

second microphone element

third microphone element

first structure 62 second structure

64 third structure

66 common point between the first, second and third structures

68 open side of the microphone

70 90° angle between adjacent structures in microphone

72 wire leading from microphone elements

74 adapter for connecting microphone elements to an amplifier

76 stand for microphone

78 handle for microphone

Detailed Description of the Preferred Fmhodiment

Turning now descriptively to the drawings, in which similar reference characters denote similar elements throughout the several views, Figures 1 through 6 illustrate the audio speaker array of the present invention indicated generally by the numeral 10. Figures 7 and 8 illustrate the array of the present invention is illustrated with audio microphones indicated generally by the numeral 50.

The audio speaker array 10 is illustrated in Figure 1 within a speaker cabinet 12. The audio speaker array 10 includes a first speaker element 14, a second speaker element 16 and a third speaker element 18. The first speaker element 14 is maintained in position within the speaker cabinet 12 by a first structure 20. The second speaker element 16 is maintained in position within the speaker cabinet 12 by a second structure 22. The third speaker element 18 is maintained in position within the speaker cabinet 12 by a third structure 24. The first, second and third structures 20, 22 and 24, respectively, are preferably triangular in shape and even more preferably right triangles.

A first leg of the first structure 20 is positioned adjacent and in mating relation with a first leg of the second structure 22. The first and second structures 20 and 22 preferably extend perpendicular to each other. A second leg of the first structure 20 is positioned adjacent and in mating relation with a first leg of the third structure 24. The first and third structures 20 and 24 also preferably extend perpendicular to each other. A second leg of the second structure 22 is positioned adjacent and in mating relation with a second leg of the third structure 24. The second and third structures 22 and 24 also preferably extend perpendicular to each other. The first, second and third structures 20, 22 and 24 have a prismatic relationship whereby each structure extends along a respective one of the x, y and z planes. The first, second and third structures 20, 22 and 24 all meet at a common point 32 forming three sides of a pyramid. The common point is at the right angle of each of the first, second and third structures 20, 22 and 24. The first, second and third structures 20, 22 and 24 are positioned within the speaker cabinet 12 facing an open side 34 of the cabinet 12. A cover 36 is positioned over the open side 34 of the cabinet 12. The cover 36 is releasably connected to the cabinet 12 by retaining clips 38.

A right side view of the speaker array 10 is illustrated in Figure 2. From this view, the first speaker element 14 is shown centrally positioned in the first structure 20. Positioned at a 90° angle to the first structure 20 is the third structure 24 and the third speaker element 18 extends from the third structure 18 on a side opposite the first structure 20. The right angle 33 of the first structure 20 is positioned to contact the right angle of the third structure 24 at the meeting point 32.

A front view of the speaker array 10 is shown in Figure 3. As can be seen from this figure, the right angle 33 of the first structure 20, the right angle 35 of the second structure 22 and the right angle 37 of the third structure 24 all meet at the point 32. The first leg of the first structure 20 is positioned adjacent and in mating relation with the first leg of the second structure 22. The first and second structures 20 and 22 preferably extend perpendicular to each other. The second leg of the first structure 20 is positioned adjacent and in mating relation with the first leg of the third structure 24.

The first and third structures 20 and 24 also preferably extend perpendicular to each other. The second leg of the second structure 22 is positioned adjacent and in mating relation with the second leg of the third structure 24. The second and third structures

22 and 24 also preferably extend perpendicular to each other. The first, second and third structures 20-, 22 and 24 have a prismatic relationship. The first speaker element

14 is substantially centrally positioned in the first structure 20. The second speaker element 16 is substantially centrally positioned in the second structure 22. The third speaker element 18 is substantially centrally positioned in the third structure 24.

A cross-sectional view of the speaker array 10 taken along the connection between the first and second structures 20 and 22 and facing the second structure 22 is illustrated in Figure 4. As can be seen the second and third structures 22 and 24 form a right angle 26 therebetween. The hypotenuse of the second and third structures 22 and 24 are positioned against a front side 40 of the speaker cabinet 12 and the structures extend back from the front side 40 into the speaker cabinet 12. The second speaker element 16 is shown substantially positioned on the second structure 22.

A cross-sectional view of the speaker array 10 taken along the connection between the first and second structures 20 and 22 and facing the first structure 20 is illustrated in Figure 5. As can be seen the first and third structures 20 and 24 form a right angle 28 therebetween. The hypotenuse of the first and third structures 20 and 24 are positioned against the front side 40 of the speaker cabinet 12 and the structures extend back from the front side 40 into the speaker cabinet 12. The first speaker element 14 is shown substantially positioned on the first structure 20. A top view of the speaker array 10 with a top side of the cabinet 12 removed is illustrated in Figure 6. As can be seen from this figure, the first and second structures 20 and 22 form a right angle 30 therebetween. The hypotenuse of the first and second structures 20 and 22 are positioned against the front side 40 of the speaker cabinet 12 and the structures extend back from the front side 40 into the speaker cabinet 12.

The present invention is illustrated as a microphone array 50 in Figure 7. A front view of the microphone 52 is shown with the microphone array 50 positioned substantially centrally therein. As can be seen, the audio microphone array 50 includes a first microphone element 54, a second microphone element 56 and a third microphone element 58. The first microphone element 54 is maintained in position within the microphone 52 by a first structure 60. The second microphone element 56 is maintained in position within the microphone 52 by a second structure 62. The third microphone element 58 is maintained in position within the microphone 52 by a third structure 64. The first, second and third structures 60, 62 and 64, respectively, are preferably triangular in shape and even more preferably right triangles.

A first leg of the first structure 60 is positioned adjacent and in mating relation with a first leg of the second structure 62. The first and second structures 60 and 62 preferably extend perpendicular to each other. A second leg of the first structure 60 is positioned adjacent and in mating relation with a first leg of the third structure 64. The first and third structures 60 and 64 also preferably extend perpendicular to each other. A second leg of the second structure 62 is positioned adjacent and in mating relation with a second leg of the third structure 64. The second and third structures 62 and 64 also preferably extend perpendicular to each other. The first, second and third structures 60, 62 and 64 have a prismatic relationship whereby each structure extends along a respective one of the x, y and z planes. The first, second and third structures 60, 62 and 64 all meet at a common point 66 forming three sides of a pyramid. The common point is at the right angle of each of the first, second and third structures 50, 62 and 64. The first, second and third structures 60, 62 and 64 are positioned within the microphone 52 facing an open side 68 of the microphone 52. A microphone 52 is illustrated in Figure 8 including the microphone array 50 of the present invention. As can be seen from the figure, the microphone array 50 is positioned in the microphone at a substantially central location. The 90° angle between the structures is indicated by the numeral 70. Extending from each of the microphone elements is a wire 72 for connection to an amplifier through an adapter 74. A handle 78 extends from a bottom side of the microphone 52 and the wires extend therethrough. The microphone 52 is maintained in position by a stand 76 which releasably grasps the handle 78.

The audio array 10, 50 of the present invention works as does any conventional speaker or microphone, the results are improved due to the arrangement of the speaker and microphone elements. The arrangement of the speaker or microphone elements in the 90°-90°-90° array provides a uniform response with increasing frequencies and eliminates lobing and beaming of frequencies.

From the above description it can be seen that the audio speaker/microphone array of the present invention is able to overcome the shortcomings of prior art devices by providing an audio speaker/microphone array which is able to provide a uniform response with increasing audio signal frequencies and eliminate lobing and beaming of frequencies. The audio speaker/microphone array includes speakers or microphones which form the array arranged at 90° to each other thereby providing the same frequency response at all points within the radiation reception pattern of the cluster, the cluster being a prismatic array such as in a transmitter or receiver antenna. The relationship between the speaker/microphone elements in the array minimizes the directional effects of the speaker/microphone elements at a wide range of frequencies and clustering of the microphone elements in the 90°-90°-90° array provides a Q of 8 and a 9dB forward gain over a single microphone with no lobing or frequency drop offs within the 90°-90°-90° reception pattern. Furthermore, the audio speaker/microphone array of the present invention is simple and easy to use and economical in cost to manufacture.

Claims

1. An audio speaker/microphone array comprising: a) a first flat member in the shape of a right triangle; b) a second flat member in the shape of a right triangle, said second flat member being at right angles to said first flat member with a leg of each member being in mating relationship to each other; c) a third flat member in the shape of a right triangle, said third flat member being at right angles to both of said first and second flat members with legs of the third flat member being in mating relationship with legs of said first and second flat members so that there is formed a partial enclosure with the right angle corner of each triangle being concurrent with each other; d) an opening centrally positioned within each of said flat members; and e) a speaker/microphone element mounted through a said opening in each of said flat members, each speaker/microphone element being mounted on an outside of the flat member with the speaker/microphone element directed into said partial enclosure.

2. The audio speaker/microphone array of claim 1 in which said array in mounted inside of a housing, said housing having an open face side and said partial enclosure faces said open face side.

3. The audio speaker/microphone array of claim 1 in which said array consists of all microphones.

4. The audio speaker/microphone array of claim 1 in which said array consists of all speakers.

5. The audio speaker/microphone array of claim 2 in which said housing is a speaker cabinet, the array consists of speakers, and each flat member has a hypotenuse and the hypotenuse of the second and third flat members are positioned against a front side of said cabinet and extend back from the front side of said cabinet.

6. The audio speaker/microphone array of claim 3 in which said array is positioned within a microphone enclosure mounted on an end of a handle, wires to said array extending out through an opposite end of said handle, and a stand for releasably supporting said handle and microphone array, said enclosure having an opening and said partial enclosure facing said opening.