JP2009200575A - Speaker array system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a composite wave face such that a traveling direction designated by steering angles and an actual traveling direction includes a small deviation by a speaker array with simple constitution. <P>SOLUTION: When a traveling direction of a composite wave face of sound wave output from a plurality of speaker units constituting the speaker array is designated with horizontal and vertical steering angles, components of a vector indicating the traveling direction are found from the horizontal and vertical steering angles. Then two delay audio signals supplied to two speaker units selected optionally from the plurality of speaker units are controlled to have a delay time difference corresponding to the inner product of the vector and a displacement vector between the two speaker units. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a speaker array including a plurality of speaker units.

  An example of this type of speaker array system is a delay array type (for example, Patent Document 1). In the delay array type speaker array system, directivity control of sound waves output from the speaker array is realized by appropriately adjusting the delay time difference of audio signals applied to each of a plurality of speaker units forming the speaker array. Here, the directivity control of the sound wave output from the speaker array is control of the traveling direction of the combined wavefront of the sound wave output from each speaker unit and the spread of the combined wavefront. In the technique disclosed in Patent Document 1, the directivity control is realized as follows. First, a first delay process for horizontal control is performed on the input audio signal IN, and speaker unit rows SP (i, 1) (i = 1 to m), SP (i, 2) (i = 1 to 1). m),... SP (i, n) (n = 1 to m) are generated, and n first delayed audio signals are generated. Next, a second delay process for vertical control is performed on each of the n first delayed audio signals, and the n × m second delayed audio signals obtained thereby are used as speaker units SP (i, j) (i = 1 to m, j = 1 to n).

  As an example of a method for designating the traveling direction of the composite wavefront, there is a mode of designating by the steering angle in the vertical direction and the horizontal direction. That is, when the normal direction of the array surface of the speaker array is the z axis, the vertical direction (vertical direction) is the y axis, and the direction orthogonal to both the z axis and the y axis (that is, the horizontal direction) is the x axis, This is a mode in which the traveling direction of the composite wavefront is represented by an angle in the rotational direction (horizontal steering angle) from the z-axis to the x-axis and an angle in the rotational direction (vertical steering angle) from the z-axis to the y-axis. According to this aspect, the traveling direction of the combined wavefront can be expressed as “a direction in which the horizontal direction is steered to the left by α degrees and the vertical direction is steered by a β degrees in the vertical direction”. There is.

  For example, as shown in FIG. 8A, four speaker units SP (i, j) (i = 1 to 2, j = 1 to 2) are arranged in 2 rows and 2 columns in the horizontal direction and the vertical direction. As for the speaker array, as shown in FIG. 8B, when a horizontal steering angle α and a vertical steering angle β are designated, a composite wavefront that advances in the traveling direction represented by these two steering angles is formed. For this purpose, the delay time difference of the audio signal given to each speaker unit SP (i, j) may be controlled as follows.

For the speaker units (for example, the speaker unit SP (1, 1) and the speaker unit SP (1, 2)) adjacent to each other in the horizontal direction, an audio signal having a delay time difference corresponding to the path difference of the sound wave output from each of them. Should be given. For example, when the audio signal applied to the speaker unit SP (1, 1) is used as a reference, the audio signal applied to the speaker unit SP (1, 2) includes the speaker unit SP (1, 1) as shown in FIG. it may be granted a delay corresponding to the path difference between 1) _(D x sinα). Similarly, for the speaker units (for example, the speaker unit SP (1, 1) and the speaker unit SP (2, 1)) that are adjacent to each other in the vertical direction, A delay corresponding to the path difference (D _y sin β) with the speaker unit SP (1, 1) may be given. For the speaker unit SP (2, 2), the path difference from the speaker unit SP (1, 2) is D _y sin β, and the speaker unit SP (1, 2) and the speaker unit SP (1, 1) Since the path difference is D _x sin α, an audio signal to which a delay corresponding to the sum of these path differences (D _x sin α + D _y sin β) is given may be given.
JP 2006-211230 A

However, in the aspect in which the direction of travel of the combined wavefront is specified by the steering angle in the horizontal direction and the vertical direction and the directivity control is performed with a delay as shown in FIG. There may be a deviation between the actual traveling direction of the wavefront and the traveling direction intended by the user. For example, in the speaker array shown in FIG. 8A, when D _x = D _y = D and α = β = 45 °, the delay for the speaker unit SP (2, 2) is the speaker unit SP. (1, 2) and the delay with respect to the speaker unit SP (2, 1) become too large (see FIG. 8C), and this causes a shift in the traveling direction.
The present invention has been made in view of the above-described problems, and it is possible to form a composite wavefront with a small configuration between a traveling direction designated by a steering angle and an actual traveling direction with a simple configuration of a speaker array. The purpose is to provide technology.

  In order to solve the above problems, the present invention provides a speaker array including a plurality of speaker units, and delay means for generating a plurality of delayed audio signals to be provided to the plurality of speaker units by delaying an input audio signal, respectively. Assuming a first axis orthogonal to the array surface of the speaker array, and second and third axes orthogonal to the first axis and orthogonal to each other, each of the plurality of speaker units should radiate A steering angle in the rotational direction from the first axis to the second axis in the traveling direction of the combined wavefront of the sound wave, and a second steering angle in the rotational direction from the first axis to the third axis. The designation means for designating and two delayed audio signals given to two speaker units arbitrarily selected from the plurality of speaker units Control means for controlling to have a delay time difference corresponding to the inner product of the vector of the traveling direction of the combined wavefront of the sound wave to be emitted from each of the plurality of speaker units and the displacement vector between the two speaker units; The control means obtains the first, second, and third axial components of the traveling direction vector from the first and second steering angles, and determines the components and the displacement vectors. A speaker array system is provided, wherein the inner product is calculated from each of the first, second, and third axial components.

  In the loudspeaker array system according to the present invention, processing for obtaining first, second and third axial components of the vector of the traveling direction of the composite wavefront from the first and second steering angles specified by the user is executed. The delay amount of each delayed audio signal is such that the delayed audio signal applied to each of any two speaker units has a delay time difference corresponding to the inner product of the vector in the traveling direction and the displacement vector between both speaker units. The process which controls is performed.

  In a more preferred aspect, the designating means of the speaker array system designates a spread angle of the composite wavefront in addition to the first and second steering angles, and the control means is a delay time difference corresponding to the inner product. In addition, the delay amount of each delayed audio signal is controlled so as to have a delay time difference corresponding to the spread angle. According to such an aspect, it is possible to cause the speaker array to output a combined wavefront that propagates while spreading with a spread angle specified by the user with little deviation from the traveling direction specified by the user.

Embodiments of the present invention will be described below with reference to the drawings.
(A: Configuration)
FIG. 1 is a diagram illustrating a configuration example of a speaker array system 200 according to an embodiment of the present invention. The speaker array system 200 is a so-called delay array type speaker array system. As shown in FIG. 1, the speaker array system 200 includes a speaker array 210, a delay unit 220, an amplification unit 230, a user interface (hereinafter “UI”) providing unit 240 and a control unit 250.

  In the speaker array 210, the speaker axes of the speaker units 211-i (i = 1 to N: N is a natural number of 2 or more) are parallel to each other (that is, so as to form a planar baffle surface). They are arranged side by side. A composite wavefront propagating in a certain traveling direction is formed by the envelope surface of the wavefront at the same time of the sound wave output from these speaker units 211-i. As the speaker unit 211-i, for example, a speaker having a wide directivity such as a cone type speaker may be used. As a configuration aspect of the speaker array 210, an aspect configured by only speaker units having the same acoustic characteristics, and an aspect configured by combining plural types of speaker units having different acoustic characteristics (for example, different output sound ranges) are conceivable. . As long as the speaker unit has the same acoustic characteristics, the speaker array 210 may be configured by arranging the speaker units in a matrix as shown in FIG. On the other hand, in the case of a configuration in which a plurality of types of speaker units having different acoustic characteristics are combined, as shown in FIG. 2 (B), a low-frequency range is provided around small speaker units that support a high-frequency range arranged in a matrix. The speaker array 210 may be configured by arranging large speaker units that support the above.

The delay means 220 is, for example, a DSP (Digital Signal Processor). The delay means 220 performs a delay process on the input audio signal IN01 given from the sound source 100 to generate a delayed audio signal X01-i (i = 1 to N). Here, when the input audio signal IN01 given from the sound source 100 is an analog signal, it may be converted into a digital signal by an A / D converter and given to the delay means 220. In the present embodiment, so-called one-tap delay processing is executed as the delay processing. This one-tap delay process may be implemented using a plurality of shift registers, or may be implemented using a RAM (Random Access Memory). For example, in the case of using the RAM, the input audio signal IN01 is written into the RAM, and the time corresponding to the delay corresponding to each of the speaker units 211-i (i = 1 to N) after the writing is performed. When the time elapses, the input audio signal IN01 may be read from the RAM, and the delay unit 220 may be caused to execute the process applied to the amplification unit 230 as the delayed audio signal X01-i. As described above, in the present embodiment, each of the delayed audio signals X01-i is generated by the one-tap delay process, so that the FIR (Finite Impulse
The delay means 220 can be configured with a small-scale DSP as compared with the case where the delayed audio signal is generated by the Response type processing.

  As shown in FIG. 1, the amplifying unit 230 includes multipliers 231-i (i = 1 to N) corresponding to the respective speaker units 211-i (i = 1 to N). The delayed audio signal X01-i is given from the delay means 220 to the multiplier 231-i. Each of the multipliers 231-i (i = 1 to N) multiplies the delayed audio signal X 01-i given from the delay means 220 by a predetermined coefficient (coefficient given from the control means 250) and outputs the result. The signal level of the delayed audio signal X01-i is amplified to a level suitable for speaker driving. Each of the delayed audio signals X01-i output from the amplifying means 230 is converted into an analog audio signal by a D / A converter (not shown in FIG. 1), and is provided to the corresponding speaker unit 211-i.

  The UI providing unit 240 allows the user to specify desired directivity (that is, the traveling direction of the composite wavefront and the extent of the wavefront), and provides the specified content data AI01 indicating the specified content to the control unit 250. Various modes can be conceived for allowing the user to specify desired directivity. For example, a predetermined coordinate system (a coordinate system in which the center of the speaker array 210 is the coordinate origin, the normal direction of the array surface of the speaker array 210 is the z axis, the vertical direction is the y axis, and the horizontal direction is the x axis) is assumed. It is conceivable to specify the traveling direction of the synthetic wavefront by the coordinates of the center point of the area (hereinafter referred to as the target area) that is the target of the acoustic service, and specify the extent of the wavefront by the shape and size of the target area. . As the UI providing unit 240 that allows the user to specify directivity in this manner, a GUI (Graphical User Interface) that draws the positional relationship between the speaker array 210 and the target area and the shape of the target area by operating a pointing device such as a mouse is considered. It is done. As another mode for allowing the user to specify the desired directivity, the direction of travel of the composite wavefront is specified by the steering angle in the horizontal direction and the vertical direction, and the spread of the composite wavefront is determined by the spread angle in the horizontal direction and the vertical direction. A mode to be designated is conceivable. As the UI providing unit 240 that allows the user to specify desired directivity in this manner, a keyboard that allows key input of numerical values representing the two types of steering angles and the two types of spread angles is conceivable.

The control unit 250 executes a process of calculating a delay to be given to each delayed audio signal X01-i based on the specified content data AI01 and applying the delay to the delay unit 220 in order to realize the directivity represented by the specified content data AI01. As shown in FIG. 1, the control unit 250 includes a CPU (Central Processing Unit) 251, a non-volatile memory 252 such as FlashROM, and a volatile memory 253 such as RAM. The nonvolatile memory 252 stores in advance a control program 252a and array information 252b for causing the CPU 251 to execute directivity control processing characteristic of the speaker array system 200 according to the present embodiment. Here, the array information 252b is information indicating an arrangement position of each speaker unit 211-i (i = 1 to N) constituting the speaker array 210 in each speaker array 210 (for example, the center of the speaker surface of the speaker array 210). Is the information indicating the coordinate position of each speaker unit 211-i in a coordinate space, where the normal direction of the array surface is the z axis, the vertical direction is the y axis, and the horizontal direction is the x axis. On the other hand, the volatile memory 253 is used by the CPU 251 as a work area when the control program 252a is executed. The directivity control processing executed by the CPU 251 in accordance with the control program 252a is roughly divided into two processes, a delay calculation data calculation process SA01 and a delay setting process SA02, as shown in FIG.
Hereinafter, these two processes will be described in detail.

(B: Directivity control processing)
The delay calculation data calculation process SA01 is a process of calculating the delay calculation data from the designated content data AI01 given from the UI providing unit 240. Here, the delay calculation data is data for calculating the delay time difference between the delayed audio signals X01-i to be given to any two speaker units 211-i included in the speaker array 210. In the present embodiment, as the delay calculation data, data representing the traveling direction vector v _p that is a unit vector in the traveling direction of the combined wavefront and the spread angles BW _h and BW _v in the horizontal direction and the vertical direction are calculated. Here, the reason for calculating the traveling direction vector v _p is as follows.

For example, as shown in FIG. 4, it is assumed that a composite wavefront propagating in a certain traveling direction is formed by sound waves output from each of the speaker unit SP0 and the speaker unit SP1 located on the x-axis on the xz plane. To do. In this case, the unit vector indicating the traveling direction of the combined wavefront is v _p (that is, the norm of v _p is 1), and the vector (hereinafter referred to as the displacement vector) indicating the arrangement position of the speaker unit SP1 viewed from the speaker unit SP0 is v _e. Then, as shown in FIG. 4, the path difference d between the sound wave output from the speaker unit SP1 and the sound wave output from the speaker unit SP0 is expressed by the following formula 1, and as shown in the following formula 2, the vector v equals the inner product of _p and the vector _{v e} (scalar product).

The path difference d as described above is represented by the inner product of the displacement vector v _e between the traveling direction vector v _p and the speaker units is the same in three-dimensional space. For example, delay of progression direction vector v _{if p} and the displacement vector v _e is represented by the number of 3 or less, the delayed audio signals to be supplied by the displacement vector v _e to the two speaker units mutual positional relationship is expressed The time difference corresponds to the following Equation 4.

In this embodiment, the displacement vector v _e for any two of the N speaker units 211-i constituting the speaker array 210 can be determined by referring to the array information 252b. Therefore, when the traveling direction vector vp is obtained, the delayed audio signal to be given to any two of the N speaker units 211-i when forming a composite wavefront that proceeds in the direction represented by the traveling direction vector vp. The delay time difference of X01-i can be calculated according to the above equation 4. This is the reason for calculating the traveling direction vector v _p . Hereinafter, a method of calculating the traveling direction vector v _p and the spread angles BW _h and BW _v will be described.

(B-1: Method for calculating traveling direction vector)
First, a method for calculating the traveling direction vector v _p will be described.
As described above, there are a mode in which the user designates the traveling direction of the composite wavefront by a mode in which the user designates by the coordinates of the center point of the target area and a mode in which the design is designated by the steering angle in the horizontal direction and the vertical direction. For example, if the traveling direction of the composite wavefront is designated by the coordinates of the center point of the target area, for example, if the coordinates of the center point are (X, Y, Z), the traveling direction vector v _p is the following number: It can be calculated by the operation of 5.

以下、上記数６および数７にしたがって進行方向ベクトルｖ_ｐを求めることの妥当性について説明する。 On the other hand, if the mode for specifying the moving direction of the horizontal and vertical steering angles combined wavefront, for example, is designated gamma _h as the horizontal direction of the steering angle, if the gamma _v as a steering angle in the vertical direction is designated First, two types of angles φ _h and φ _v calculated according to the following equation 6 are obtained, and using these φ _h and φ _v , a traveling direction vector v _p is obtained as shown in the following equation 7. good.

Hereinafter, the validity of obtaining the traveling direction vector v _p according to the above equations 6 and 7 will be described.

The above two modes are conceivable as modes for designating the traveling direction of the composite wavefront, but in any of these modes, the actual traveling direction of the combined wavefront must match. Therefore, when the traveling direction of the composite wavefront is designated by the center coordinates of the target area and the traveling direction vector v _p shown in Equation 3 is obtained, the same result is obtained in the manner of designating the steering angle in the horizontal direction and the vertical direction. In order to be able to do so, what kind of value should be specified as these steering angles will be considered. When the steering angles in the horizontal direction and the vertical direction are φ _h and φ _v , respectively, the path differences in the horizontal direction and the vertical direction are D _x sin φ _h and D _y sin φ _v , respectively (in FIG. 8B, α = φ _h , β = φ _v ) It is only necessary to determine φ _h and φ _v so that these sums coincide with the path difference d obtained by Equation 4 (that is, to satisfy Equation 8). However, in Formula 8, _Dx = _Dh , _Dy = _Dv .

In order for the above equation 8 to always hold, x = sin φ _h and y = sin φ _v must be satisfied. Here, since the advancing direction vector v _p is a unit vector (that is, x ² + y ² + z ² = 1), the advancing direction vector v _p must satisfy Equation 7 above.

On the other hand, when the traveling direction vector v _p is expressed by Equation 3, conventionally, as shown in FIG. 5, an angle formed by the projection vector v _xz obtained by projecting the traveling direction vector v _p onto the xz plane and the z axis. γ _h is used as the horizontal steering angle, and the angle γ _v formed by the projection vector v _yz obtained by projecting the traveling direction vector v _p onto the yz plane and the z axis is used as the vertical steering angle. As is apparent from FIG. 5, there is a relationship shown in the following equation (9) between the x, y, and z components of the traveling direction vector v _p and the two types of angles γ _h and γ _v .

この数１０をφ_ｈおよびφ_ｖについて解くと、前述の数６が得られる。 As described above, since the traveling direction vector v _p shown in Equation 3 can be expressed as Equation 7 using φ _h and φ _v , γ _h and γ _v can be expressed using φ _h and φ _v , It can be expressed as the following formula 10.

Solving for the number 10 phi _h and phi _v, 6 described above can be obtained.

As is apparent from Equation 6, γ _h ≠ φ _h and γ _v ≠ φ _v . In the conventional delay array type loudspeaker array system, the projection vector obtained by projecting the traveling direction vector v _p expressed as a component as shown in Equation 3 onto the xz plane and the angle γ _{h formed} by the z axis are set as the horizontal steering angle. And the projection vector obtained by projecting the same traveling direction vector v _p onto the yz plane and the angle γ _{v formed} by the z axis are regarded as the same as the steering angle in the vertical direction, and the delay calculation is performed. In 6, when gamma _h and gamma _v is in both sufficiently small, tan _h ≒ sin [gamma] _h, can be approximated with tanγv ≒ sinγ _v, also, tan ² gamma _h and tan ² gamma _v is 1 In comparison, it is sufficiently small and can be ignored. If such approximation is performed, Equation 6 certainly means φ _h ≈γ _h and φ _v ≈γ _v . However, if at least one of γ _h or γ _v is so large that the above approximation cannot be performed and the above approximation is not valid, φ _h ≠ γ _h and φ _v ≠ γ _v . This is the reason why the deviation between the traveling direction specified by the steering angle in the horizontal direction and the vertical direction and the traveling direction of the actual composite wavefront increases as the steering angle increases in the conventional delay type speaker array. In the present embodiment, a traveling direction vector v _p is obtained from the horizontal steering angle γ _h and the vertical steering angle γ _v specified by the user according to Equations 6 and 7, and the traveling direction vector v _p and the displacement vector are obtained. v since the delay time difference according to the inner product of the _e and to give to each delayed audio signals X01-i, largely deviated and the traveling direction of the actual combined wavefront traveling direction specified by the steering angle in the horizontal direction and the vertical direction There is nothing.

(B-2: Spreading angle calculation method)
Next, a method for calculating the horizontal spread angle BW _h and the vertical spread angle BW _v will be described. Various methods for calculating the horizontal spread angle BW _h and the vertical spread angle BW _v can be considered according to the directivity designation mode by the user. For example, in the case of a mode in which directivity is designated via the GUI according to the position, shape, and size of the target area, as shown in FIG. 6A, a projected image of the speaker array 210 (hereinafter referred to as a cover). Area) is enlarged or reduced so as to cover the target area, and as shown in FIGS. 6B and 6C, the horizontal and vertical directions when the cover area is viewed from the speaker array 210 are set. The opening angles may be obtained geometrically, and these opening angles may be set as the horizontal spread degree BW _h and the vertical spread angle BW _v . On the other hand, in the case where the horizontal spread angle BW _h and the vertical spread angle BW _v are directly designated numerically by key input or the like, no special calculation is performed and the horizontal spread represented by the designated content data AI01 is not performed. The angle BW _h and the vertical spread angle BW _v may be used as they are.

(B-3: Delay setting process)
The delay setting process SA02 calculates a delay time difference between delayed audio signals to be given to any two speaker units included in the speaker array 210 from the traveling direction vector v _p , the spread angles BW _h and BW _v , and each delayed audio signal X01− This is a process of giving the delay amount D01-i of i to the delay means 220. In the delay setting process SA02, one speaker unit serving as a reference for the delay amount calculation is selected from the N speaker units 211-i included in the speaker array 210, and the other N−1 speaker units are selected. The delay amount D01-i for each is calculated as follows. That is, in the delay setting process SA02, determine the displacement vector v _e viewed from the speaker unit for the speaker units to be delay amount computing becomes the reference with reference to the array information 252b, progression and its displacement vector v _e By calculating the inner product with the direction vector v _p , the delay amount for forming the composite wavefront propagating in the traveling direction is calculated, and the delay amount calculated in this way depends on the spread angles BW _h and BW _v . The delay amount D01-i corresponding to each speaker unit 211-i is calculated by adding the delay amounts. As a specific method for calculating the delay amount according to the spread angle in the horizontal direction and the vertical direction, a method in a conventional delay array type speaker array system may be used. Further, the method of giving the delay by the spread angle BW may be the mode shown in FIG. 7A or the mode shown in FIG. 7B.

  As described above, according to the speaker array 1 according to the present embodiment, even when the traveling direction is specified by the steering angle in the horizontal direction and the vertical direction, the deviation between the traveling direction and the actual traveling direction is not possible. Can be formed by the sound wave output from each speaker unit 211-i. Further, since the delay process executed by the delay unit 220 of the speaker array system 1 according to the present embodiment is a one-tap delay process, the delay unit 220 can be configured with a small-scale DSP. There is also a feature that the configuration of is simplified.

(C: deformation)
Although one embodiment of the present invention has been described above, the following modifications may be added to the embodiment.
(1) In the above-described embodiment, the present invention is applied to a two-dimensional speaker array configured by arranging a plurality of speaker units so as to form a planar baffle surface. However, the plurality of speaker units are curved baffles. Of course, the present invention may be applied to a loudspeaker array configured to form a surface.

(2) In the above-described embodiment, in addition to the control of the traveling direction of the composite wavefront of the sound wave output from each speaker unit 211-i, the control of the combined wavefront spread is performed, but only the control of the traveling direction is performed. Of course you can go. In the mode in which only the control of the traveling direction is performed, the traveling direction vector v _p is obtained from the specified content data AI01 input via the UI providing unit 240, and the displacement vector v _e for any two speaker units 211-i. the determined from the array information 252b, by calculating the inner product of the traveling direction vector v _p a displacement vector v _e according to Equation 1 (or several 3 and number 4), applied to the two speaker units 211-i delay The delay time difference between the audio signals X01-i may be calculated.

(3) In the above-described embodiment, the control program 252a for causing the CPU 251 of the control means 250 to execute the directivity control processing characteristic of the speaker array system according to the present invention is stored in advance in the nonvolatile memory 252 of the control means 250. It was. However, the control program 252a may be distributed by being written on a computer-readable recording medium such as a CD-ROM (Compact Disk-Read Only Memory) or downloaded via an electric communication line such as the Internet. You may distribute it. The control program 252 a distributed in this way can be stored in a general computer device, and the computer device can function as the control means 250.

It is a figure which shows the structure of the speaker array system 200 which is one Embodiment of this invention. It is a figure which shows an example of the array surface of the speaker array 210 which the same speaker array system 200 has. It is a figure which shows an example of the process which CPU251 of the control means 250 of the speaker array system 200 performs. It is a figure for demonstrating the calculation method of the general delay time difference. Is a diagram showing the relationship between the traveling direction vector v _p and the steering angle. It is a figure for demonstrating an example of the calculation method of the divergence angle of a horizontal or vertical direction. It is a figure for demonstrating an example of the delay provision by the divergence angle of a horizontal or vertical direction. It is a figure for demonstrating the directivity control in the conventional speaker array system of a delay array system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Sound source, 200 ... Speaker array system, 210 ... Speaker array, 211-i (i = 1-N) ... Speaker unit, 220 ... Delay means, 230 ... Amplification means, 231-i (i = 1-N) ... Multiplier, 240 ... UI providing means, 250 ... control means, 251 ... CPU, 252 ... nonvolatile memory, 252a ... control program, 252b ... array information, 253 ... volatile memory.

Claims (2)

A speaker array comprising a plurality of speaker units;
Delay means for delaying an input audio signal to generate a plurality of delayed audio signals to be given to each of the plurality of speaker units;
Assuming a first axis orthogonal to the array surface of the speaker array and second and third axes orthogonal to the first axis and orthogonal to each other, sound waves to be emitted from each of the plurality of speaker units Designating a steering angle in the rotational direction from the first axis to the second axis in the traveling direction of the combined wavefront and a second steering angle in the rotational direction from the first axis to the third axis A designation means to
Two delayed audio signals given to two speaker units arbitrarily selected from the plurality of speaker units are a vector of the traveling direction of a composite wavefront of a sound wave to be radiated from each of the plurality of speaker units. Control means for controlling to have a delay time difference corresponding to the inner product of the displacement vector between the speaker units;
With
The control means obtains the first, second, and third axial components of the traveling direction vector from the first and second steering angles, and the first and second displacement vectors. The inner product is calculated from each of the second and third axial components. A speaker array system, wherein: The designation means designates a spread angle of the combined wavefront in addition to the first and second steering angles;
2. The control unit according to claim 1, wherein the control unit controls a delay amount of each delayed audio signal so as to have a delay time difference corresponding to the spread angle in addition to a delay time difference corresponding to the inner product. Speaker array system.

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