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JP2007096839

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DESCRIPTION JP2007096839
The present invention provides a rack for an array speaker (microphone) system in which a
plurality of line array units are connected at an accurate position. A plurality of line array units 2
are connected to a unit holder 13. The unit holder 13 is connected by the connecting arm 12 and
connected to the base frame 11. The unit holder 13 is connected to the base frame 11 so as to
have a degree of freedom in the left-right direction, and is connected to the connecting arm 12 so
as to have a degree of freedom in the up-down direction. The upper and lower ends of the
connecting arm 12 are connected to the upper and lower end central portions of the base frame
11. The center of the connecting arm 12 is rotatably connected to the base frame 11. By rotating
the connecting arm 12, the unit holder 13 can be moved relatively equidistantly in the left-right
direction. [Selected figure] Figure 1
Array system rack
[0001]
The present invention relates to a rack for an array system that holds a plurality of line array
units in connection.
[0002]
In recent years, home theaters that can enjoy the realism of a cinema at home have become
widespread.
04-05-2019
1
In home theaters, as typified by 5.1 channel surround, it is common to install a plurality of
speakers so as to surround a listener. However, the surround system realized by such a plurality
of speaker devices has a problem that wiring to each speaker device is complicated, and a space
for installing the plurality of speaker devices is required.
[0003]
Therefore, an audio reproducing apparatus has been proposed that uses a speaker array in which
a plurality of speaker units are arranged in a line to create a virtual sound source around the
listener using the sound beam of the speaker array and the reflection from the wall of the room
(for example, Patent Document 1).
[0004]
FIG. 10 shows the structure of a line array speaker in the audio reproduction device described in
Patent Document 1. As shown in FIG.
The line array speaker is configured by arranging a plurality of speaker units 21 on a line in an
elongated housing. The speaker units 21 are arranged equidistantly at an interval d, and the
width of the speaker array is L.
[0005]
When audio signals of the same phase are input to the plurality of speaker units 21, the
synthesized wavefront of the sounds output from all the speaker units 21 becomes an audio
beam propagating in parallel only in the forward direction. The sound components propagating
in directions other than the forward direction are canceled by combining the components output
from the respective speaker units 21 (by mutual interference), and only the forward direction
component is enhanced by the combination to be a voice beam. It will remain. In addition, when
the sound output from the speaker unit 21 is sequentially delayed from one end to the other end,
the synthesized wavefront is inclined according to the delay time, and the sound beam can be
directed obliquely.
[0006]
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As described above, by controlling the delay amount of the audio signal input to the plurality of
speaker units, it is possible to direct the audio beam in a target direction (control the directivity
characteristic). JP, 2005-64746, A
[0007]
In the line array speaker as shown in FIG. 10, when the width L of the speaker array is increased
(the number of speaker units is increased), the directivity characteristic is sharpened, and the
audio beam can be concentrated in the target direction. In addition, if the width L of the speaker
array is increased, directivity control can be performed to the lower frequency band side.
[0008]
The beam width of the voice beam is determined by the following equation 1 (where, v is the
speed of sound, f is the frequency, and n is the number of speaker units).
[0009]
? = sin?1 (v / fdn) иии Formula 1 In order to increase the width L of the speaker array, the
number of speaker units is increased, and to implement the same number, the distance d of the
speaker units is made large do it.
However, if the spacing d of the speaker units is increased, another voice beam (side lobe) is
generated due to the spatial aliasing phenomenon other than the target direction, which causes a
problem that directional control of the high frequency band becomes difficult. . In order not to
generate another sound beam, d must be set to satisfy the condition of Equation 2 below.
[0010]
d <v / 2f Equation 2 For example, the lower frequency side of the frequency band in which
directivity can be controlled when the spacing d of the speaker unit is 4.5 cm and the width L of
the speaker array is 67.5 cm is From 1, the frequency is about 500 Hz, and according to
Equation 2, the high frequency side is about 4 kHz. Therefore, the frequency band for which
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directivity control can be performed is about 500 to about 4 kHz, and band reproduction of
about telephone voice can be performed, but band reproduction required for a home theater (for
example, about 250 Hz to 12 kHz) can not be realized. The In order to realize this, it is necessary
to increase the number of speaker units, but there is a problem that cost increases if the number
of speaker units is increased.
[0011]
Therefore, it is conceivable to connect a plurality of line speaker arrays in the vertical direction,
shift the position to the left and right by the number to be connected, and reduce the apparent
gap between the speaker units. FIG. 11 is a diagram showing an array speaker system in which a
plurality of line array units are connected. The figure shows an array speaker system in which
three line array units are connected. As shown in the figure, when three line array units in the
vertical direction are connected by being shifted left and right by d / 3, the apparent speaker unit
width of this array speaker system becomes d / 3. Since the apparent width of the speaker unit is
d / 3, the frequency band in which directivity control is possible is tripled on the high frequency
side.
[0012]
However, as described above, it is difficult to shift and connect to an accurate position in the
horizontal direction by ?the width of the speaker unit / the number of linked array units?, and
changing the number of links is troublesome to perform alignment each time The In addition,
when a plurality of line array units are connected as described above, the connection wiring and
the power cable are complicated.
[0013]
An object of the present invention is to provide a rack for an array system in which a plurality of
line array units can be easily connected at an accurate position.
[0014]
The rack for an array system of the present invention is a rack for an array system which holds a
plurality of speaker units or a line array unit in which microphone units are linearly arranged in
an up-down direction which is a direction orthogonal to the straight line. A plurality of unit
holders respectively connected to the plurality of line array units, a connecting arm for movably
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connecting central portions of the plurality of unit holders, and a unit positioned in the vertical
center of the unit holders A holder is fixed, and a base frame for pivotally fixing a central portion
of the connecting arm, and the base frame and the plurality of unit holders are fixed so as to be
movable only in the left and right direction which is the linear direction. And an auxiliary frame.
[0015]
In the present invention, a plurality of unit holders are connected by the connecting arm.
The connecting arm is movably connected to the central portion of each unit holder.
Further, the central portion of the unit holder and the connecting arm positioned at the center in
the vertical direction are rotatably connected to the base frame. Each unit holder is connected to
the base frame by an auxiliary frame. The auxiliary frame fixes each unit holder so as to move
only in the left and right direction. Thus, by moving the connecting arm left and right, each unit
holder can be moved left and right centering on the unit holder located at the center in the
vertical direction.
[0016]
Further, according to the present invention, a plurality of base frames are detachably mounted on
the base frame such that both ends of the connection arm are offset in the left and right direction
by the intervals of the speaker units or microphone units / integer. A connecting arm connecting
point for connecting at a place is provided.
[0017]
In the present invention, both ends of the connecting arm are connected to the base frame.
A plurality of connection points are provided so as to be connected to the base frame at positions
shifted in the left and right direction by ?interval of each speaker unit or microphone unit /
integer?.
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[0018]
The present invention further includes a built-in wiring portion electrically connecting the
plurality of unit holders, and a line array unit connection terminal electrically connecting the unit
holder and the line array unit. It features.
[0019]
In the present invention, the unit holder is electrically connected by the built-in wiring.
In addition, each unit holder has a connection terminal electrically connected to the line array
unit, whereby all the line array units are electrically connected, eliminating the need for
connection wiring of the line array unit and a power cable. Become.
[0020]
According to the present invention, a plurality of line array units can be easily connected at
precise positions, and the position of each line array unit can be easily changed according to the
number of connections.
[0021]
Hereinafter, an array speaker system using a rack for an array system according to an
embodiment of the present invention will be described.
FIG. 1 is a perspective view of an array speaker system according to an embodiment of the
present invention as viewed from the front right side. FIG. 2 is a front view of the array speaker
system. As shown in FIGS. 1 and 2, the array speaker system includes an array speaker system
rack 1 and a plurality (seven in the figure) of line array units 2 fixed to the array speaker system
rack 1. And.
[0022]
The line array unit 2 has a configuration in which a plurality of speaker units are arranged in a
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line at equal intervals. The speaker unit generally uses a cone type speaker unit, but other types
such as a horn type speaker unit may be used. The plurality of line array units 2 are overlapped
in parallel at equal intervals in the vertical direction.
[0023]
The array speaker system rack 1 comprises a base frame 11, a connecting arm 12 and a plurality
of unit holders 13. The base frame 11 is a thin plate having a substantially rectangular shape
when viewed from the front, and has a shape like a frame. The base frame 11 is an entire frame
of the array speaker system rack 1, and supports the unit holders 13 slidably in the left-right
direction by the connecting pins 15 and the long holes 11D (see FIGS. 4 and 6). The connection
arm 12 is a thin rod-like arm and is sandwiched between the front surface of the base frame 11
and the back surfaces of the plurality of unit holders 13, and the upper and lower ends of the
connection arm 12 are connected near the center of the upper and lower ends of the base frame
11 Ru. Further, the connecting arm 12 is connected to the rear central portion of each unit
holder 13. The connecting arm 12 connects a plurality of unit holders 13 and defines their
positional relationship. The unit holder 13 is a substantially L-shaped horizontally long thin plate,
and has flanges 13A (see FIG. 4) at both left and right ends. The line array unit 2 is sandwiched
from the left and right by the flange portion 13A, and the line array unit 2 is held. Further, the
unit holder 13 electrically connects each line array unit 2.
[0024]
FIG. 3 is a front view of the array speaker system. The figure (A) is a figure at the time of
connecting the arm 12 for connection with the base frame 11 in the orthogonal | vertical
direction. The figure (B) is a figure at the time of moving each unit holder 13 relatively [space |
interval / 5 of speaker units] relatively to a left-right direction. The same figure (C) is a figure at
the time of moving "space / 3 of speaker units" relatively to each unit holder 13 to the left-right
direction.
[0025]
In FIG. 7B, the unit holders 13 are fixed to the left and right with [speaker unit spacing / 5]
shifted, so the apparent spacing between the speaker units is d / 5 in the entire array speaker
system. Further, in FIG. 6C, since each unit holder 13 is fixed to the left and right with [speaker
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unit spacing / 3], the apparent spacing between the speaker units is d / 3 as the whole array
speaker system. . The base frame 11 has a plurality of pinning portions (see FIG. 5) in the vicinity
of the upper center, and these pinning portions 11C each have the unit holder 13 relative to each
other [speaker unit spacing / 2] to It is installed at five positions on either side of the center so
that it is fixed by being shifted in the left and right direction by [speaker unit spacing / 6].
Therefore, each unit holder 13 is removed by removing the pin engaged with the pinning portion
11C, moving (turning) the connecting arm 12 in the left-right direction, and engaging the pin
with the other pinning portion 11C. Can be moved to the [speaker unit spacing / integer] position
accurately and easily.
[0026]
Next, each part of the array speaker system will be described in detail. As shown in the exploded
perspective view seen from the front right side of FIG. 4, the base frame 11 is shaped like a frame
(hollow-bold-shaped), and a bar is provided laterally in the vertical center of the hollow portion
And a longitudinal beam portion 11B serving as a flat plate-like support at two places in the
longitudinal direction. The cross beam portion 11A and the longitudinal beam portion 11B are
connected and fixed to each other, and their respective end portions are fixed to the base frame
11.
[0027]
The cross beam portion 11A has a round hole 11F at a substantially central portion. The circular
hole 11F and the circular hole 12B at the central portion of the connecting arm 12 are
overlapped, and the connecting pin 15 is inserted from the back surface to rotatably connect the
connecting arm 12 to the base frame 11. The connecting arm 12 has a plurality of rectangular
through holes 12A at equal intervals from near both ends to the center, and the upper and lower
through holes 12A of the through holes 12A are in the vicinity of the upper center of the base
frame 11. Are connected to any of the plurality of pinning portions 11C provided in FIG. 5 is an
enlarged front view near the upper center of the base frame 11. As shown in the figure, the base
frame 11 has a plurality of pinning portions 11C near the upper center. The positioning pin 14
penetrates the through hole 12A of the connecting arm 12 and engages with the pinning portion
11C. Although not shown, the same applies to the vicinity of the lower center of the base frame
11. Thus, the connecting arm 12 is connected to the base frame 11.
[0028]
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Further, the connecting arm 12 penetrates the connecting pin 15 into the other through hole
12A from the rear side, and connects the rear side center of the unit holder 13. FIG. 6 is an
exploded perspective view of the array speaker system as viewed from the rear left side. As
shown in FIG. 6, the unit holder 13 has a small convex portion 13D near the center of the back
surface, and the small convex portion 13D is inserted into the through hole 12A of the
connecting arm 12 or the central round hole 12B. It is connected with the connection pin 15
penetrated from the back. Thus, the unit holder 13 located at the center in the vertical direction
is connected to the connecting arm 12 without any degree of freedom, and the unit holder 13 at
the center in the axial direction of the connecting arm has a degree of freedom in the vertical
direction. It is connected to the connecting arm 12 in the held state.
[0029]
In FIG. 4, the longitudinal beam portion 11 </ b> B has a plurality of rectangular elongated holes
11 </ b> D that are long in the horizontal direction at equal intervals in the vertical direction.
Further, a round hole 11E is provided at the center in the vertical direction. A connecting pin 15
is inserted from the back into the long hole 11D or the round hole 11E, and the connecting pin
15 and the back of the unit holder 13 are connected to hold the unit holder 13 on the base frame
11. As shown in FIG. 6, the unit holder 13 has a plurality of cylindrical overhangs 13C on the
back, and the overhangs 13C are inserted into the long holes 11D or round holes 11E and
penetrated from the back It is connected to the connecting pin 15. Thus, the unit holder 13
except the unit holder 13 positioned at the center in the vertical direction is held by the base
frame 11 slidably in the left and right direction. The unit holder 13 positioned at the center in
the vertical direction is held by the base frame 11 without any degree of freedom in the left-right
direction because the projecting portion 13C is inserted into the round hole 11E and connected
to the connecting pin 15.
[0030]
Therefore, as shown in the enlarged view of the rear center of FIG. 7, when the connecting arm
12 is pivoted in the left-right direction with the center as a fulcrum, the unit holder 13 connected
thereto is parallel in the left-right direction It will move.
[0031]
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The unit holder 13 for fixing the elongated rectangular parallelepiped array unit 2 has flanges
13A at the left and right ends of the substantially L-shaped thin plate, and a connector 13B near
the center.
The connectors 13B are terminals electrically connected to the array unit 2 (for supplying audio
signals and power), and the line array units 2 are electrically connected to one another through
the connectors 13B. Although not shown, each unit holder 13 is electrically connected to the
base frame 11 through electrical wiring, and an audio signal input from an input terminal or the
like installed on the base frame 11 is a line array unit 2 can be supplied. Further, the power
supplied from a power supply terminal (such as a power outlet) installed in the base frame 11
can be supplied to the line array unit 2.
[0032]
In FIG. 4, the front surface near the center of the upper and lower ends of the base frame 11 and
the front surface of the cross beam portion 11A are recessed on the back side (or located on the
back side) by the thickness of the connecting arm 12. When the connecting arm 12 contacts
here, the front face of the base frame 11 and the front face of the connecting arm 12 become
flush with each other, and a plurality of unit holders 13 will be flush arranged in parallel.
[0033]
As described above, since each unit holder 13 is vertically stacked in parallel at equal intervals,
when the connecting arm 12 is pivoted in the left-right direction with the central portion as a
fulcrum, Thus, the unit holders 13 move in parallel in the left-right direction, and the unit holders
13 move relatively equidistantly.
[0034]
As described above, the beam width of the audio beam output from the array speaker system is
determined by the equation 1 {? = sin?1 (v / fdn)}, and the spatial aliasing phenomenon does
not generate another direction audio beam. In the above, the distance between the speaker units
must be set so as to satisfy Formula 2 (d <v / 2f), but in the array speaker system of this
embodiment, the positions of the plurality of line array units 2 are moved to the left and right
Since this can be done, the apparent speaker unit interval can be easily changed according to the
required frequency band, and the frequency band in which directivity can be controlled can be
improved.
[0035]
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10
For example, as shown in FIG. 3B, when the line array unit 2 is moved by d / 5 in the left-right
direction, the frequency band capable of directivity control can be improved five times toward
the high frequency side. When the line array unit 2 is moved by d / 3 in the left-right direction as
in the case of), the frequency band capable of directivity control can be improved three times to
the high frequency side.
[0036]
The line array unit 2 is electrically connected through the unit holder 13, and synchronized audio
signals are supplied to all the line array units 2.
Of the line array units 2, any one of the line array units 2 serves as a master unit of the array
speaker system, and controls the directivity characteristic of the entire array speaker system as
one speaker array.
[0037]
Here, the electrical connection of the array speaker system will be described.
FIG. 8 is a diagram showing an electrical connection of the array speaker system.
As shown in the figure, the audio input terminal installed in the base frame 11 is connected to
the connector 13B of each unit holder 13 via the built-in wiring.
The connector 13 B of each unit holder 13 is connected to the line array unit 2. An audio signal
input to the audio input terminal of the base frame 11 is input to any one connector 13 B or all
the connectors 13 B via the built-in wiring and supplied to the line array unit 2. Each line array
unit 2 is connected to the connector 13B via a built-in wiring, and can mutually transmit and
receive signals.
[0038]
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Next, the configuration of each line array unit 2 of the array speaker system of the present
embodiment will be described in detail. FIG. 9 is a block diagram showing the configuration of
each line array unit 2. As shown in the figure, the line array unit 2 includes n speaker units 21-1
to 21-n, a directivity control unit 22, a control unit 23, a clock switching unit 24, and a
conversion unit 25. .
[0039]
The n speaker units 21-1 to 21-n are connected to the directivity control unit 22, and the
directivity control unit 22 is connected to the control unit 23, the clock switching unit 24, and
the conversion unit 25.
[0040]
The directivity control unit 22, the control unit 23, and the clock switching unit 24 are connected
to the directivity control unit 22, the control unit 23, and the clock switching unit 24 of another
line array unit 2, respectively.
The directivity control unit 22, the control unit 23, and the clock switching unit 24 are connected
via the above-described connector 13B.
[0041]
The directivity control unit 22 supplies the input audio data to the speaker units 21-1 to 21-n
with a predetermined delay amount, and controls the directivity of the speaker array. Each delay
amount is set by the control unit 23. The speaker units 21-1 to 21-n D / A convert the input
audio data and emit the sound.
[0042]
The control unit 23 controls the clock switching unit 24 and the directivity control unit 22.
Furthermore, among the line array units 2 to be connected, the control section 23 of any one line
array unit 2 also controls the other line array units 2 connected. Specifically, when these line
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array units 2 are connected to the array speaker system rack 1, any one line array unit 2
becomes a master unit, and the control unit 23 of the master unit controls the other line array
units 2. Do. The other line array unit 2 is a slave unit and operates based on the control of the
control unit 23 of the master unit. The assignment of the master and the slave may be
determined by a switch (not shown) or the like provided on the back of the line array unit 2. For
example, the line array unit 2 located at the center in the vertical direction may be assigned to
the master unit.
[0043]
The clock switching unit 24 is connected to a crystal oscillator (not shown) built in the speaker
device, and supplies a reference clock to the directivity control unit 22 and the reference clock to
the other line array unit 2 connected. Transfer The directivity control units 22 of the connected
line array units 2 all operate based on this reference clock. The clock switching unit 24 of the
master unit supplies the reference clock read from the crystal oscillator built in the speaker
device to the directivity control unit 22, and the clock switching unit 24 of the slave unit controls
the directivity of the reference clock received from the master unit It supplies to the part 22.
[0044]
The converter 25 converts the analog audio signal input from the audio device through the base
frame 11 and the unit holder 13 into digital form, and the sampling frequency of the audio data
when digital audio data is input. The frequency conversion function of converting (for example,
44.1 kHz) into the reference frequency (for example, 48 kHz) of the line array unit 2 is provided.
The converted voice data is supplied to the directivity control unit 22.
[0045]
The directivity control unit 22 causes the speaker units 21-1 to 21-n to have predetermined
delay amounts for audio data input from the conversion unit 25 (or another line array unit)
based on an instruction from the control unit 23. Supply. Further, the voice data is transferred to
the directivity control unit 22 of another line array unit 2 to be connected. The directivity control
unit 22 of the master unit supplies the audio data input from the conversion unit 25 to the
speaker units 21-1 to 21-n with a predetermined delay amount. The directivity control unit 22 of
the slave unit supplies the audio data transferred from the master unit to the speaker units 21-1
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to 21-n with a predetermined delay amount. The delay amount of audio data to be supplied to
each speaker unit is set by the control unit 23 of the master unit.
[0046]
Next, directivity control of this array speaker system will be described in detail. When the user
connects an audio device to an input terminal installed in the base frame 11 and inputs an audio
signal, any one of the line array units 2 becomes a master unit of the array speaker system. This
master unit controls another line array unit 2 (slave unit) connected. One of the line array units 2
may be automatically selected as a master unit, or the user may manually select one. FIG. 9 (A) is
a block diagram of the master unit, and FIG. 9 (B) is a block diagram of the slave unit.
[0047]
In FIG. 6A, the control unit 23 of the line array unit 2 which has become the master unit sets its
own clock switching unit 24 to read the reference clock from the built-in crystal oscillator. The
clock switching unit 24 supplies a reference clock to the directivity control unit 22. The
directivity control unit 22 operates with the reference clock supplied from the built-in crystal
oscillator.
[0048]
Also, the clock switching unit 24 of the master unit transfers the reference clock to the clock
switching unit 24 of the slave unit. Also, the control unit 23 of the master unit transmits an
instruction to the control unit 23 of the slave unit so that the clock switch 24 of the slave unit
reads the reference clock received from the master unit.
[0049]
In the master unit, the conversion unit 25 converts the audio signal input from the audio device
into a digital signal and supplies the digital signal to the directivity control unit 22 as audio data.
The directivity control unit 22 supplies audio data to each of the speaker units 21 with a
predetermined delay amount. The delay amounts are set by the control unit 23. Also, the
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directivity control unit 22 transfers the audio data input from the conversion unit 25 to the
directivity control unit 22 of the slave unit.
[0050]
In FIG. 7B, the control unit 23 of the line array unit 2 that has become a slave unit reads the
reference clock received from the master unit to its own clock switching unit 24 based on an
instruction from the control unit 23 of the master unit. To set. The clock switching unit 24 of the
slave unit supplies the directivity control unit 22 with the reference clock received from the
master unit. The directivity control unit 22 of the slave unit operates with the reference clock
received from this master unit. Further, the clock switching unit 24 transfers the reference clock
received from the master unit to another slave unit.
[0051]
The directivity control unit 22 receives the audio data transferred from the master unit, supplies
the audio data to each of the speaker units 21 with a predetermined delay amount, and transfers
the audio data to another slave unit. All directivity control units 22 of the slave units operate with
the reference clock received from the master unit, so that synchronized digital audio data is
supplied to all the line array units 2 connected.
[0052]
In the slave unit, the delay amount of the audio data to be supplied to each speaker unit is set by
the control unit 23 of the master unit. The control unit 23 of the master unit sets the delay
amount of each directivity control unit 22 via the control unit 23 of the slave unit. Here, the
control unit 22 of the master unit controls the directivity characteristic of the entire array
speaker system as one speaker array. That is, the delay amounts are set assuming that the line
array units 2 connected vertically are all present on the same line. Thereby, the directivity
characteristic of the whole array speaker system can be controlled.
[0053]
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15
In the above embodiment, an example is shown in which an audio signal is input to the master
unit and transferred to the slave unit, but an audio signal is directly input from an audio device to
each of all the line array units 2, and then Each directivity control unit 22 may synchronize audio
data. In this case, also in the slave unit, an audio signal is input to the converter 25. The
converter 25 converts the audio signal into a digital signal and supplies the digital signal as voice
data to the directivity controller 22.
[0054]
As described above, the array speaker system in the present embodiment connects and
synchronizes the plurality of line array units 2. The apparent speaker unit spacing of this array
speaker system can be easily changed from 1/2 to 1/6 by rotating the connecting arm 12, and
for a single line array unit 2, The frequency whose directivity can be controlled easily can be
improved as needed.
[0055]
In the present embodiment, although the rack for an array system capable of connecting seven
stages in the vertical direction has been described, the present invention is not limited to this
configuration example. The four stages may be connected in the vertical direction, or two stages
may be connected. Moreover, in this embodiment, although the array speaker was demonstrated
as a line array unit, even if it is an array microphone, it is possible to apply the rack for array
systems of this invention.
[0056]
Front view of the array speaker system from the front right side Front view of the array speaker
system Front view of the array speaker system exploded front view of the array speaker system
from the front right side An enlarged front view array speaker system near the upper center of
the base frame 11 Figure showing the electrical connection of an enlarged view array speaker
system near the center of the back of the exploded perspective view base frame 11 viewed from
the back left side Figure showing the line array unit showing the line array unit showing the state
where the line array unit is overlapped Figure
Explanation of sign
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[0057]
1-Array speaker system rack 2- Line array unit 11-Base frame 12-Connecting arm 13-Unit holder
14-Positioning pin 15-Connecting pin
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