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JP2009200575

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DESCRIPTION JP2009200575
An object of the present invention is to make it possible to form a composite wavefront having a
small deviation between a traveling direction designated by a steering angle and an actual
traveling direction by a speaker array having a simple configuration. When a traveling direction
of a combined wave front of sound waves output from each of a plurality of speaker units
constituting a speaker array is designated by a steering angle in a horizontal direction and a
vertical direction, each of vectors representing the traveling direction The components are
determined from the horizontal and vertical steering angles. Then, two delay audio signals given
to two speaker units arbitrarily selected from a plurality of speaker units have a delay time
difference corresponding to an inner product of the vector and a displacement vector between
the two speaker units. Control to have. [Selected figure] Figure 3
スピーカアレイシステム
[0001]
The present invention relates to a loudspeaker array comprising a plurality of loudspeaker units.
[0002]
As an example of this type of speaker array system, there is a delay array system (for example,
Patent Document 1).
In the delay array type speaker array system, directivity control of sound waves output from the
09-05-2019
1
speaker array is realized by appropriately adjusting the delay time difference of audio signals to
be provided to each of the plurality of speaker units forming the speaker array. Here, directivity
control of the sound wave output from the speaker array is control of the traveling direction of
the synthetic wave front of the sound wave output from each speaker unit and the degree of
spread of the synthetic wave front. In the technique disclosed in Patent Document 1, the
directivity control is realized as follows. First, a first delay process for control in the horizontal
direction is applied to the input audio signal IN, and a speaker unit row SP (i, 1) (i = 1 to m), SP (i,
2) (i = 1 to 1) m) Generate n first delayed audio signals associated with each of SP (i, n) (i = 1 to
m). Next, a second delay process for vertical control is applied to each of the n first delay audio
signals, and the n × m second delay audio signals obtained by this are applied to the speaker
unit SP (i, j) (i = 1 to m, j = 1 to n)
[0003]
As an example of the method of designating the advancing direction of the synthetic wave front,
there is an aspect of designating by the steering angles in the vertical direction and the
horizontal direction. That is, when the normal direction of the array surface of the speaker array
is z axis, the vertical direction (vertical direction) is y axis, and the direction orthogonal to both z
and y axes (that is, horizontal direction) is x axis. In this aspect, the traveling direction of the
combined 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 from the z axis to the y
axis (vertical steering angle). According to this aspect, the traveling direction of the combined
wavefront can be expressed as "a direction steered to the left by α degrees in the horizontal
direction and to a downward β degree in the vertical direction", which is intuitively easy to
understand There is.
[0004]
For example, as shown in FIG. 8A, four speaker units SP (i, j) (i = 1 to 2, j = 1 to 2) are arranged in
two rows and two columns in the horizontal and vertical directions. For the speaker array, as
shown in FIG. 8 (B), when the steering angle α in the horizontal direction and the steering angle
β in the vertical direction are specified, a composite wavefront that travels in the traveling
direction represented by these two steering angles is formed. In order to achieve this, the delay
time difference of the audio signal given to each speaker unit SP (i, j) may be controlled as
follows.
[0005]
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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 waves output from each It is good to give
For example, based on the audio signal given to the speaker unit SP (1, 1), the audio signal given
to the speaker unit SP (1, 2) includes the speaker unit SP (1, 1) as shown in FIG. It suffices to
provide a delay according to the path difference (Dx sin α) from 1). In addition, similarly for the
speaker units (for example, the speaker unit SP (1,1) and the speaker unit SP (2,1)) adjacent to
each other in the vertical direction, similarly to the audio signal given to the speaker unit SP (2,1)
And a delay according to the path difference (Dysin β) with the speaker unit SP (1, 1). And,
regarding the speaker unit SP (2, 2), the path difference with the speaker unit SP (1, 2) is Dysin
β, and the path difference between the speaker unit SP (1, 2) and the speaker unit SP (1, 1)
Since it is Dx sin α, an audio signal provided with a delay according to the sum of these path
differences (D x sin α + Dy sin β) may be given. Unexamined-Japanese-Patent No. 2006211230
[0006]
However, in the aspect of specifying the traveling direction of the synthesized wavefront by the
steering angles in the horizontal direction and the vertical direction, and performing the
directivity control by providing a delay as shown in FIG. 8B, the synthesis is performed as the
steering angle increases. There may be a deviation between the actual direction of travel of the
wavefront and the direction of travel intended by the user. For example, in the speaker array
shown in FIG. 8A, when Dx = Dy = D and α = β = 45 °, the delay for the speaker unit SP (2, 2)
is equal to that of the speaker unit SP (1 , 2) and the delay for the speaker unit SP (2, 1) (see FIG.
8C), which causes the above-mentioned deviation in the traveling direction. The present
invention has been made in view of the above problems, and it is possible to form a composite
wavefront having a small deviation between the traveling direction designated by the steering
angle and the actual traveling direction with a speaker array having a simple configuration. The
purpose is to provide technology to
[0007]
In order to solve the above problems, the present invention provides a speaker array comprising
a plurality of speaker units, and delay means for generating a plurality of delayed audio signals
respectively given to the plurality of speaker units by delaying an input audio signal. A first axis
orthogonal to the array plane of the speaker array, and second and third axes orthogonal to the
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first axis and orthogonal to each other, and radiating from each of the plurality of speaker units A
steering angle in the rotational direction from the first axis toward the second axis from the first
axis in the traveling direction of the synthetic wave front of the sound wave and a second
steering angle in the rotational direction from the first axis to the third axis Designation means
for designation and two delayed audio signals given to two speaker units arbitrarily selected
from the plurality of speaker units Control means for controlling so as to have a delay time
difference corresponding to the inner product of the vector of the traveling direction of the
synthetic wave front of the sound wave to be radiated from each of the plurality of speaker units
and the displacement vector between the two speaker units. The control means determines
respective components in the first, second and third axial directions of the vector in the traveling
direction from the first and second steering angles, and measures the respective components and
the displacement vector 1. A speaker array system, characterized in that the inner product is
calculated from each of the first, second and third axial components.
[0008]
In the speaker array system according to the present invention, processing is performed to
obtain first, second and third axial components of the vector of the traveling direction of the
combined wavefront from the first and second steering angles specified by the user Amount of
delay of each delayed audio signal such that the delayed audio signal to be given to each of any
two speaker units has a delay time difference corresponding to the inner product of the vector in
the traveling direction with the displacement vector between the two speaker units A process of
controlling the is performed.
[0009]
In a more preferable aspect, the designation unit of the speaker array system designates the
spread angle of the combined wavefront in addition to the first and second steering angles, and
the control unit sets a delay time difference corresponding to the inner product. In addition to
the above, the delay amount of each of the delayed audio signals is controlled so as to have a
delay time difference corresponding to the spread angle.
According to such an aspect, it becomes possible to output to the speaker array a composite
wavefront that propagates while spreading with a spread angle specified by the user with a small
deviation from the traveling direction specified by the user.
[0010]
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Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
(A: Configuration) FIG. 1 is a diagram showing a configuration example of a speaker array system
200 according to an embodiment of the present invention. The speaker array system 200 is a socalled 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.
[0011]
The speaker array 210 is arranged such that the respective speaker axes of the speaker units
211-i (i = 1 to N: N is a natural number of 2 or more) are parallel to one another (that is, to form
a planar baffle surface) It is arranged side by side. The envelope of the wave front at the same
time of the sound wave output from these speaker units 211-i forms a synthesized wave front
that propagates in a fixed traveling direction. As the speaker unit 211-i, for example, a speaker
having 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
characteristic, or an aspect configured by combining plural types of speaker units having
different acoustic characteristics (for example, different output sound ranges) can be considered.
. If it is an aspect comprised only by the speaker unit which has the same acoustic characteristic,
as shown to FIG. 2 (A), each speaker unit should just be arranged in a matrix form, and the
speaker array 210 should be comprised. On the other hand, as shown in FIG. 2 (B), in the case of
combining the speaker units of different types having different acoustic characteristics, as shown
in FIG. 2 (B), the bass region is arranged around the small speaker units supporting the high
frequency range. The speaker array 210 may be configured by arranging large-sized speaker
units that support.
[0012]
The delay means 220 is, for example, a DSP (Digital Signal Processor). The delay means 220
performs delay processing on the input audio signal IN01 supplied from the sound source 100 to
generate a delayed audio signal X01-i (i = 1 to N). Here, when the input audio signal IN01
supplied from the sound source 100 is an analog signal, it may be converted into a digital signal
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by the A / D converter and supplied to the delay means 220. In the present embodiment, socalled 1-tap delay processing is performed as the delay processing. The one-tap delay process
may be performed using a plurality of shift registers, or may be performed using a random
access memory (RAM). For example, in the case of a mode using a RAM, according to the delay
corresponding to each of the speaker units 211-i (i = 1 to N) since the input audio signal IN01 is
written to the RAM and the writing is performed. When the time has elapsed, the input audio
signal IN01 may be read out from the RAM, and the processing to be given to the amplification
unit 230 as the delayed audio signal X01-i may be executed by the delay unit 220. As described
above, in the present embodiment, since each of the delayed audio signals X01-i is generated by
the one-tap delay process, the scale is small compared to the case where the delayed audio
signals are generated by the process of FIR (Finite Impulse Response) type. The delay means 220
can be configured by any DSP.
[0013]
As shown in FIG. 1, the amplification means 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
supplied from the delay means 220 to the multiplier 231-i. Each of multipliers 231-i (i = 1 to N)
multiplies delayed audio signal X 01 -i given from delay means 220 by a predetermined
coefficient (coefficient given from control means 250) and outputs the result. The signal level of
the delayed audio signal X01-i is amplified to a level suitable for driving the speaker. Each of the
delayed audio signals X01-i output from the amplification means 230 is converted into an analog
audio signal by a D / A converter (not shown in FIG. 1), and supplied to the corresponding
speaker unit 211-i.
[0014]
The UI providing means 240 causes the user to specify a desired directivity (that is, the traveling
direction of the combined wavefront and the spread of the wavefront), and provides the control
means 250 with specified content data AI01 representing the specified content. Various modes
can be considered as modes for causing the user to specify desired directivity. For example,
assume 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 z axis, the vertical direction is y axis, and the horizontal direction is x axis).
It is conceivable that the advancing direction of the synthesized wavefront is specified by the
coordinates of the center point of the area (hereinafter referred to as target area) to which the
acoustic service is provided, and the degree of expansion of the wavefront is specified by the
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shape or size of the target area. . A GUI (Graphical User Interface) for drawing the positional
relationship between the speaker array 210 and the target area and the shape of the target area
by operating the pointing device such as a mouse may be considered as the UI providing means
240 for causing the user to specify directivity in this mode. Be Also, as another mode for causing
the user to specify the desired directivity, the traveling direction of the synthesized wavefront is
specified by the steering angle in the horizontal direction and the vertical direction, and the
spread degree of the synthesized wavefront is determined by the spread angles in the horizontal
direction and the vertical direction. It is possible to consider the way of specifying. As the UI
providing means 240 that allows the user to specify desired directivity according to this aspect, a
keyboard may be considered in which numerical values representing each of the above two types
of steering angles and the above two types of spread angles are keyed.
[0015]
The control means 250 executes processing for calculating the delay to be given to each delayed
audio signal X01-i based on the designated content data AI01 and giving it to the delay means
220 in order to realize the directivity represented by the designated content data AI01. The
control means 250 includes, as shown in FIG. 1, a central processing unit (CPU) 251, a nonvolatile memory 252 such as a flash ROM, and a volatile memory 253 such as a RAM. In the nonvolatile memory 252, a control program 252a that causes the CPU 251 to execute directivity
control processing that is characteristic of the speaker array system 200 according to the
present embodiment and an array information 252b are stored in advance. Here, the array
information 252 b is information indicating the arrangement position of each of the speaker
units 211-i (i = 1 to N) configuring the speaker array 210 in the speaker array 210 (for example,
the center of the speaker surface of the speaker array 210 The coordinate position of each
speaker unit 211-i in a coordinate space, in which the normal direction of the array surface is z
axis, the vertical direction is y axis, and the horizontal direction is x axis, On the other hand, the
volatile memory 253 is used by the CPU 251 as a work area when executing the control program
252a. The directivity control process executed by the CPU 251 in accordance with the control
program 252a is roughly classified into two processes of 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.
[0016]
(B: Directivity Control Process) The delay calculation data calculation process SA01 is a process
of calculating the delay calculation data from the designated content data AI01 supplied from the
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UI providing unit 240. Here, the delay calculation data is data for calculating the delay time
difference of each of 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 a traveling direction vector vp, which is a unit vector in the traveling direction of
the combined wavefront, and the spread angles BWh and BWv in the horizontal direction and the
vertical direction is calculated. Here, the reason for calculating the traveling direction vector vp is
as follows.
[0017]
For example, as shown in FIG. 4, it is assumed that a synthetic wave front propagating in a
certain traveling direction is formed by sound waves output from each of speaker unit SP0 and
speaker unit SP1 positioned on the x axis in the xz plane. Do. In this case, let vp be a unit vector
indicating the traveling direction of the synthesized wavefront (that is, the norm of vp is 1), and
ve be a vector (hereinafter, displacement vector) indicating the arrangement position of the
speaker unit SP1 viewed from the speaker unit SP0. 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 represented by the following equation 1, and as shown in the following
equation 2, vector vp and vector It is equal to the inner product (scalar product) of ve.
[0018]
As described above, the path difference d is represented by the inner product of the traveling
direction vector vp and the displacement vector ve between the speaker units, as in the threedimensional space. For example, when the traveling direction vector vp and the displacement
vector ve are represented by the following equation 3, the delay time difference between the
respective delayed audio signals to be given to the two speaker units whose positional
relationship is represented by the displacement vector ve is It corresponds to the following
equation 4.
[0019]
In the case of this embodiment, displacement vectors ve for any two of the N speaker units 211-i
that constitute the speaker array 210 can be determined with reference to the array information
252b. Therefore, when the traveling direction vector vp is obtained, a delayed audio signal to be
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given to any two of the N speaker units 211-i in forming a combined wavefront traveling 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 vp. Hereinafter, a method of calculating the traveling direction vector vp and the
spread angles BWh and BWv will be described.
[0020]
(B-1: Method of calculating traveling direction vector) First, a method of calculating the traveling
direction vector vp will be described. As described above, as modes for causing the user to
specify the traveling direction of the synthesized wavefront, there are modes for causing the user
to designate using the coordinates of the center point of the target area and aspects for causing
the steering angle to be specified in the horizontal and vertical directions. In the aspect in which
the advancing direction of the synthesized 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
advancing direction vector vp is It can be calculated by the calculation of
[0021]
On the other hand, in the case of designating the traveling direction of the synthesized wavefront
by the steering angles in the horizontal direction and the vertical direction, for example, when
γh is designated as the steering angle in the horizontal direction and γv is designated as the
steering angle in the vertical direction, First, two types of angles φh and φv calculated
according to the following equation 6 may be determined, and the traveling direction vector vp
may be determined as shown in the following equation 7 using these φh and φv. Hereinafter,
the validity of determining the traveling direction vector vp in accordance with Equations 6 and 7
will be described.
[0022]
The above two modes can be considered as modes for specifying the traveling direction of the
synthesized wavefront, but the traveling direction of the actual synthesized wavefront must be
the same in any of these modes. Therefore, when the traveling direction of the synthesized
wavefront is specified by the center coordinates of the target area, and the traveling direction
vector vp shown in Equation 3 is obtained, the same result can be obtained in the aspect of
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specifying the steering angles in the horizontal direction and the vertical direction. In order to do
so, we will consider what values should be specified as these steering angles. Assuming that the
steering angles in the horizontal direction and the vertical direction are φh and φv, respectively,
the path differences in the horizontal direction and the vertical direction are Dx sin φh and
Dysin φv, respectively (if α = φh and β = φv in FIG. good). It is sufficient to determine φh and
φv so that the sum of them agrees with the path difference d obtained by Equation 4. That is, the
equation 8 is satisfied. However, in the equation 8, Dx = Dh, Dy = Dv.
[0023]
In order for the above equation 8 to always hold, x must be sin φh and y should be sin φv. Here,
since the traveling direction vector vp is a unit vector (i.e., x <2> + y <2> + z <2> = 1), the
traveling direction vector vp must satisfy Eq.
[0024]
On the other hand, when the traveling direction vector vp is represented by Equation 3,
conventionally, as shown in FIG. 5, the projection vector vxz obtained by projecting the traveling
direction vector vp onto the xz plane and the angle γh formed by the z axis are horizontal The
projection vector vyz obtained by projecting the forward direction vector vp onto the yz plane,
which is used as the steering angle in the direction, and the angle γv formed by the z axis, are
used as the steering angle in the vertical direction. As apparent from FIG. 5, the x, y, z
components of the traveling direction vector vp and the above two types of angles γh and γv
have the relationship shown in the following equation 9.
[0025]
As described above, since the traveling direction vector vp shown in equation 3 can be expressed
as equation 7 using φh and φv, γh and γv are obtained as in the following equation 10 using
φh and φv Can be represented. If this equation 10 is solved for φh and φv, the above equation
6 is obtained.
[0026]
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As apparent from Equation 6, γh ≠ φh and γv ≠ φv. In the conventional delay array type
speaker array system, the projection vector obtained by projecting the traveling direction vector
vp expressed componently as shown in Eq. 3 onto the xz plane and the angle γh formed by the z
axis are the same as the steering angle in the horizontal direction. In the delay calculation, the
projection vector obtained by projecting the same traveling direction vector vp onto the yz plane
and the angle γv formed by the z axis are identified with the steering angle in the vertical
direction. In Eq. 6, when both γh and γv are sufficiently small, tan γh ≒ sin γh and tan
γvsinsin γv can be approximated, and tan <2> γh and tan <2> γv are compared with 1 as
well. Small enough to ignore. If such approximation is carried out, Equation 6 certainly means
φhhγh and φv ≒ γv. However, if at least one of γh and γv can not perform the above
approximation, and if the above approximation is not appropriate, then φh ≠ γh and φv ≠
γv. This is the cause of the deviation between the advancing direction designated by the steering
angles in the horizontal direction and the vertical direction and the advancing direction of the
actual synthesized wavefront as the steering angle increases in the conventional delay speaker
array. In this embodiment, the traveling direction vector vp is determined according to Eqs. 6 and
7 from the steering angle γh in the horizontal direction and the steering angle γv in the vertical
direction specified by the user, and the inner product of the traveling direction vector vp and the
displacement vector ve Since the delay time difference according to is given to each delay audio
signal X01-i, the traveling direction designated by the steering angle in the horizontal direction
and the vertical direction does not greatly deviate from the traveling direction of the actual
synthesized wavefront.
[0027]
(B-2: Method of calculating spread angle) Next, a method of calculating the spread angle BWh in
the horizontal direction and the spread angle BWv in the vertical direction will be described.
Various methods can be considered as a method of calculating the spread angle BWh in the
horizontal direction and the spread angle BWv in the vertical direction according to the
specification of the directivity by the user. For example, in the case of an aspect in which
directivity is specified via the GUI by the position, shape and size of the target area, as shown in
FIG. 6A, a projected image of the array surface of the speaker array 210 (hereinafter referred to
as a cover Area is enlarged or reduced to cover the target area, as shown in FIG. 6 (B) and FIG. 6
(C), when viewed from the speaker array 210 in the horizontal and vertical directions. The
opening angles may be determined geometrically, and these opening angles may be set as the
horizontal spread degree BWh and the vertical spread angle BWv. On the other hand, in the case
of a mode in which the horizontal spread angle BWh and the vertical spread angle BWv are
directly specified by numerical values by key input or the like, no particular calculation is
performed, and the horizontal spread angle BWh represented by the specified content data AI01
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The spread angle BWv in the vertical direction may be used as it is.
[0028]
(B-3: Delay Setting Process) The delay setting process SA02 calculates the delay time difference
of the delayed audio signal given to any two speaker units included in the speaker array 210
from the traveling direction vector vp, the spread angles BWh and BWv, This is processing for
giving the delay amount D01-i of each delayed audio signal X01-i to the delay means 220. In this
delay setting process SA02, one of the N speaker units 211-i included in the speaker array 210 is
selected as the reference of the delay amount calculation, and the other N-1 speaker units are
selected. The delay amount D01-i for each is calculated as follows. That is, in this delay setting
process SA02, for each speaker unit to be subjected to delay amount calculation, a displacement
vector ve seen from the speaker unit as a reference is determined with reference to the array
information 252b, and the displacement vector ve and the traveling direction vector By obtaining
the inner product with vp, the delay amount for forming a composite wave front propagating in
the traveling direction is calculated, and the delay amount corresponding to the spread angles
BWh and BWv is added to the delay amount thus calculated. The delay amount D01-i
corresponding to each speaker unit 211-i is calculated. As a specific method of calculating the
delay amount according to the spread angle in the horizontal direction and the vertical direction,
the method in the conventional delay array type speaker array system may be used. Moreover,
how to give the delay by spread angle BW may be an aspect shown to FIG. 7 (A), and an aspect
shown to FIG. 7 (B) may be sufficient.
[0029]
As described above, according to the speaker array 1 according to the present embodiment, even
if the traveling direction is designated by the steering angles in the horizontal direction and the
vertical direction, the deviation between the traveling direction and the actual traveling direction
Can be formed by the sound waves output from the respective speaker units 211-i. In addition,
since the delay processing performed by the delay means 220 of the speaker array system 1
according to the present embodiment is one-tap delay processing, the delay means 220 can be
configured by a small-scale DSP, and the speaker system 1 There is also a feature that the
configuration of is simplified.
[0030]
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(C: Modification) Although the embodiment of the present invention has been described above,
the following modification may of course be added to this embodiment. (1) In the abovedescribed embodiment, the present invention is applied to a two-dimensional speaker array in
which a plurality of speaker units are arranged to form a planar baffle surface. However, the
plurality of speaker units are curved baffles The invention may of course be applied to a
loudspeaker array arranged to form a face.
[0031]
(2) In the embodiment described above, in addition to the control of the traveling direction of the
synthesized wave front of the sound wave output from each speaker unit 211-i, the control of the
degree of the synthesized wave front spread is performed. Of course you may go. In a mode in
which only the control of the traveling direction is performed, the traveling direction vector vp is
obtained from the specified content data AI01 input through the UI providing means 240, and
the displacement vector ve for any two speaker units 211-i is arrayed. The delayed audio signal X
01-to be given to the two speaker units 211-i by calculating from the information 252 b and
calculating the inner product of the traveling direction vector vp and the displacement vector ve
according to Equation 1 (or Equation 3 and Equation 4). The delay time difference between i may
be calculated.
[0032]
(3) In the embodiment described above, the control program 252a that causes the CPU 251 of
the control means 250 to execute the directivity control process characteristic of the speaker
array system according to the present invention is stored in advance in the non-volatile memory
252 of the control means 250. It was However, the control program 252a may be written and
distributed in a computer apparatus readable recording medium such as a CD-ROM (Compact
Disk-Read Only Memory), for example, or by downloading via a telecommunication line such as
the Internet. You may distribute it. The control program 252 a distributed in this manner can be
stored in a general computer device, and the computer device can function as the control unit
250.
[0033]
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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 a general delay time
difference. It is a figure which shows the relationship between advancing direction vector vp and
a steering angle. It is a figure for demonstrating an example of the calculation method of the
divergence angle of the horizontal or vertical direction. It is a figure for demonstrating an
example of the delay provision by the spread 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 sign
[0034]
DESCRIPTION OF SYMBOLS 100 ... Sound source, 200 ... Speaker array system, 210 ... Speaker
array, 211-i (i = 1 to N) ... Speaker unit, 220 ... Delay means, 230 ... Amplification means, 231-i (i
= 1 to N) ... Multiplier 240 UI provision means 250 control means 251 CPU non-volatile memory
252 a control program 252 b array information 253 volatile memory.
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