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JP2005210508

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DESCRIPTION JP2005210508
PROBLEM TO BE SOLVED: To provide a cabinet for an array speaker and an array speaker
system capable of improving the power of a predetermined area of an array speaker provided
with a plurality of small speakers while having a simple configuration. SOLUTION: Openings
212L1 and 212R1 are provided on each surface in the short direction of a cabinet 210, and a
partition plate 213 is provided on the inside of the cabinet 210. According to this configuration,
a resonance pipe of one-piece open pipe whose one end is sealed by the partition plate 213 and
the other end is opened by the openings 212L1 and 212R1 is formed. The resonance tube
resonates at the frequency of the wavelength corresponding to its length, so the length of the
resonance tube is adjusted in accordance with the intended frequency band (in this embodiment,
the frequency band of the mid-low range). [Selected figure] Figure 1
Cabinet for array speaker and array speaker system
[0001]
The present invention relates to a cabinet for an array speaker including a plurality of small
speakers and an array speaker system.
[0002]
In recent years, flat-screen TVs represented by plasma TVs and liquid crystal TVs have become
popular in the market.
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1
Along with this, in the audio field as well, the demand for a thin speaker system adapted to a thin
TV has been increasing. In order to realize such a thin speaker system, it is necessary to use a
plurality of small size speaker units, but when a small speaker unit is adopted, the lowest
resonance frequency f0 becomes high, and the power of the mid-low range is increased. It runs
short. Moreover, in order to realize a thin speaker system, it is necessary to miniaturize the
speakers and to make the cabinet for accommodating each speaker unit thinner. However, when
the cabinet is made thinner, the depth behind the unit is insufficient, and The total capacity of the
cabinet also decreases, and the power of the mid-low range is insufficient as described above.
[0003]
In view of such background, for example, the volume of the speaker is increased by increasing
the stroke of the edge of the speaker (see FIG. 10), and a special speaker unit which is small in
size but aims to increase the power of mid-low range is adopted. A method has been proposed
(see, for example, Non-Patent Document 1). In addition to this, a method of separately attaching a
speaker having a large aperture C shown in FIG. 10 to a panel or the like, and a method of
separately providing a speaker for covering a bass such as a subwoofer have been proposed.
[0004]
[Online] [search November 18, 2003] Internet <URL: http://www.pioneer.co.jp/crdl/rd/72.html#5>
[0005]
However, in the method described in Non-Patent Document 1, it is necessary to adopt a special
speaker unit as described above, which causes a problem of cost increase.
Further, in the above other methods, it is necessary to prepare another speaker (such as a
subwoofer) different from the small speaker, resulting in an increase in cost and a problem that
the speaker system becomes large and complicated. .
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the abovedescribed problems, and is a cabinet and an array speaker for an array speaker capable of
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improving the power of a predetermined region of an array speaker provided with a plurality of
small speakers while having a simple configuration. It aims to provide a system.
[0007]
In order to solve the above-mentioned problems, a cabinet for an array speaker according to the
present invention is a substantially rectangular cabinet for attaching a speaker array constituted
by a plurality of speaker units, and each of the speakers is provided on its longitudinal surface A
plurality of attachment parts for attaching the unit are provided, an opening is provided at an
end of the cabinet, and a partition plate for dividing an internal space is provided inside the
cabinet.
[0008]
According to this configuration, the one-opened tube resonance pipe is formed by the opening
provided on the surface in the short direction of the cabinet and the partition plate provided on
the inside of the cabinet.
Since the resonance tube resonates at the frequency of the wavelength corresponding to its
length (see FIG. 3 and the following equation (1)), a frequency band for which the length of the
resonance tube is aimed (for example, the mid-low frequency band) By adjusting in accordance
with the power of the target frequency band can be improved.
[0009]
Here, a plurality of cabinets for line array speakers are provided, and the cabinets are stacked so
that all the attachment parts face in the same direction, and the distance from the opening to
each cabinet is different in each cabinet. You may comprise the cabinet for matrix array speakers
in which the said different partition plate is provided.
[0010]
As described above, according to the present invention, it is possible to improve the power of a
predetermined area of an array speaker provided with a plurality of small speakers, with a simple
configuration.
[0011]
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Hereinafter, embodiments according to the present invention will be described with reference to
the drawings.
A.
First Embodiment FIG. 1 is a diagram showing a configuration of an array speaker system 100
according to a first embodiment.
The array speaker system 100 includes a line array speaker device 200 and an audio
reproduction device 300.
[0012]
<Line Array Speaker Device 200> The line array speaker device 200 is configured of a cabinet
210 and a plurality of speaker units 220-k (1 ≦ k ≦ 14) linearly attached to the cabinet 210.
The number of speaker units 220-k is not limited to fourteen, and can be appropriately set or
changed according to the design of the line array speaker device 200. The speaker unit 220-k is
configured by an existing small speaker unit. In general, a cone-type speaker unit is often used,
but the present invention is not limited to the cone-type speaker unit, and various speaker units
can be adopted. However, when speaker units of different types or performances are used, there
is a concern that the directivity controllability of the beam to be described later may be
deteriorated (can not be controlled). It is desirable to unify.
[0013]
On the other hand, the cabinet 210 is a substantially rectangular parallelepiped housing, and as
shown in FIG. 1, mounting surfaces 211-k equal in number to the speaker units 220-k are
substantially linear in a longitudinal surface (hereinafter, long surface). It is provided at regular
intervals. The speaker units 220-k are attached to the cabinet 210 via the attachment portions
211-k, whereby a line array speaker (a speaker group arranged in a line) is formed. In addition,
openings 212L1 and 212R1 for releasing the air inside the cabinet 210 are provided at each end
of the cabinet 210 (each surface in the short direction in FIG. 1), and the inside space of the
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cabinet 210 is an internal space The partition plate 213 which partitions off is provided. The
openings 212L1 and 212R1 may be provided at each end of the cabinet 210. For example, as
shown in A of FIG. 2, the same as the surface (installation surface) on which the speaker unit
220-k is installed. It may be provided at the end of the surface or at the end of the surface
different from the installation surface as shown in B of FIG. Further, the shapes of the openings
212L1 and 212R1 are not limited to the circular shape shown in FIG. 1, and various shapes such
as a rectangular shape shown in FIG. 2 can be adopted. The cabinet 210 having such a
configuration functions as a resonance pipe of a single-open pipe whose one end is sealed by the
partition plate 213 and the other end is opened by the openings 212L1 and 212R1. As is well
known, the resonant tube resonates at a frequency of wavelength depending on its length. By
positively utilizing the resonance phenomenon by the resonance tube and adjusting the length of
the resonance tube in accordance with a target frequency band (in the present embodiment, the
frequency band of the middle bass range), the target frequency band can be obtained. It is this
embodiment to improve the power. Hereinafter, a method of improving the power of the mid-low
range by utilizing the resonance phenomenon will be described in detail.
[0014]
FIG. 3 is a diagram for explaining the resonance phenomenon of the resonance pipe (in the case
of a single open pipe). The resonance frequency of this resonance tube depends on the resonance
tube length (hereinafter simply referred to as the tube length), and specifically, it can be obtained
by substituting the tube length L or the like into the following equation (1). fn = (2n + 1) * c / 4L
(n = 0, 1, 2,...) (1) fn; resonant frequency (Hz) c; sound velocity (m / s) L; resonant tube length (m)
[0015]
Substituting the tube length L (m) into this equation (1) and substituting values such as n = 0, 1,
2, ..., the resonances such as the fundamental resonance, 3 times resonance, 5 times resonance ...
Is obtained. However, in the present embodiment, the sound pressure level in the mid-low range
is enhanced by mainly utilizing the fundamental resonance (see the broken line shown in FIG. 3)
when n = 0 is substituted in the above equation (1). Specifically, if the lowest resonance
frequency f0 of the speaker unit 220-k attached to the cabinet 210 is about 120 (Hz), the sound
pressure level in the mid-low range lower than the lowest resonance frequency f0 is enhanced.
The basic resonance frequency is set to about 80 (Hz), and the pipe length L at this time is
obtained. The position of the partition plate 213 is determined such that the pipe length L
obtained in this manner and the distance W1 (or W2) from the opening 212 to the partition plate
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213 in the cabinet 210 shown in FIG. For example, when the fundamental resonance frequency is
set to 80 (Hz) under the condition of sound velocity c = 344 (m / s), the pipe length L is about
1.1 (m) according to the above equation (1). In this case, the partition plate 213 is provided at a
position approximately 1.1 (m) away from the opening 212.
[0016]
As described above, the sound pressure level in the mid-low range lower than the lowest
resonance frequency can be enhanced by appropriately changing the position where the
partition plate 213 is provided according to the basic resonance frequency. Here, in the present
embodiment, a single partition plate 213 forms a resonance pipe opened by the opening 212L1
and a resonance pipe opened by the opening 212R1. This makes it possible to enhance the sound
pressure level in a wide frequency range as compared with the case where one resonance pipe is
formed by one partition plate 213. The tube lengths of the respective resonance tubes (that is,
the distance W1 from the opening 212L1 to the partition plate 213 and the distance W2 from
the opening 212R1 to the partition plate) may be appropriately set according to the frequency
for the purpose of enhancing the power. good. In addition, high-order resonances other than the
basic resonance are unlikely to occur originally, and moreover, the influence of the sound
absorbing material and the position of the speaker on the nodes of the standing waves becomes
smaller.
[0017]
<Audio Reproduction Device 300> FIG. 4 is a diagram showing a configuration of the audio
reproduction device (audio signal supply device) 300. As shown in FIG. The decoder 310 decodes
the audio source and supplies the decoded digital audio signal to the resonance control unit 311.
The resonance control unit 311 is a means for controlling ON / OFF of resonance by the cabinet
210, and includes a high pass filter 311a and a selection unit 311b. The high-pass filter (control
means) 311a is a means for removing the lower frequency component contributing to the
resonance, and the cutoff frequency is set according to the frequency component to be removed.
The selection unit 311 b performs switching operation of the signal supplied to the filter unit
320 according to the resonance ON / OFF instruction given from the operation unit (input unit)
or the like (not shown). Specifically, when an instruction to turn on the resonance is given from
the operation unit or the like, the selection unit 311 b directly supplies the digital audio signal
supplied from the decoder 310 to the filter means 320 while an instruction to turn off the
resonance is given. When supplied, the selection unit 311 b supplies the digital signal from
which the frequency component contributing to the resonance has been removed by the high
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pass filter 311 a to the filter unit 320. By providing the resonance control unit 311 described
above, the user can arbitrarily switch ON / OFF of the resonance by the cabinet 210. As a result,
it is possible to prevent the problem that it can not be used at night because the bass is always
boosted. It is possible to
[0018]
The filter means 320 is means for dividing the digital audio signal supplied from the decoder
310 into a signal in the high frequency domain and a signal in the low frequency domain, for
example, the high pass filter HPF and the low pass filter LPF in which the same cutoff frequency
is set. It is composed of Here, each filter HPF, LPF is used to divide into a frequency to be a target
of beam control to be described later and a frequency that is not so, and a signal in a high
frequency region passing through the high pass filter HPF is supplied to the beam control means
330 On the other hand, the signal in the low frequency region which has passed through the low
pass filter LPF is supplied to the weighting means 360.
[0019]
The beam control means (supply control means) 330 is a means for controlling (i.e., controlling)
the angle of the beam output from each of the speaker units 220-k with respect to the signal of
the high frequency region which has passed through the high pass filter HPF. Specifically, the
beam control unit 330 performs delay processing or the like on the signal in the high frequency
region so that the phases of the sounds output from the speaker units 220-k match at the set
position, and the weighting unit 360. Supply to As described above, in this embodiment, beam
control is performed only on signals in the high frequency region passing through the high pass
filter HPF, and beam control is not performed on signals in the low frequency region passing
through the low pass filter LPF. The reason is that the sound pressure and the sound quality of
the mid-low range are secured by not performing the delay processing, and thereby it is easy to
cause the resonance. Specifically, the signal in the low frequency region that has passed through
the low pass filter LPF is supplied to the weighting means 360 in phase without being subjected
to the beam forming process. However, at this time, in order to eliminate the delay shift with the
signal in the high frequency region, the delay processing unit 350 is provided at the subsequent
stage of the low pass filter LPF, thereby fixed delay (fixed amount of delay) to all speaker units
220-k. I will try to hang it.
[0020]
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The weighting means 360 is a means for adding a weight (gain) to the supplied digital audio
signal, and is constituted by twice as many multipliers 361-k 'as the speaker unit 220-k. These
multipliers 361-k 'are provided with coefficients (such as appropriate window function
coefficients and Bessel array coefficients) to be multiplied by the digital audio signal from a gain
control device (not shown). These respective coefficients are appropriately set and changed in
accordance with the desired directional characteristics and the like. The weighting means 360
adds a weight based on a window function coefficient, a Bessel array coefficient, etc. to the
supplied digital audio signal, and supplies it to the addition means 340.
[0021]
The addition means (supply control means) 340 is configured by the same number of adders
341-k as the speaker unit 220-k. Each addition means 341-k is supplied with a signal of a beam
controlled high frequency region to which a predetermined weight is added and a signal of a
non-beam controlled low frequency region. Each adder 341-k adds each signal supplied thereto
and outputs the result to the corresponding speaker unit 220-k. Each speaker unit 220-k
generates a sound based on a given signal, but the cabinet 210 to which each speaker unit 220-k
is attached has a resonance tube structure as described above. The resonance phenomenon of
the cabinet 210 makes it possible to enhance the sound pressure level of the target mid-low
range.
[0022]
B. Second Embodiment FIG. 5 is a diagram showing a configuration of a matrix array speaker
apparatus 200 'according to a second embodiment. The matrix array speaker device 200 'is
basically obtained by stacking a plurality of line array speaker devices 200 shown in FIG. 1 in the
longitudinal direction. The mounting portions 211-k of the stacked cabinets 210 are all arranged
in the same direction. On the other hand, the position of the partition plate 213 provided in each
cabinet 210 is different for each layer. Thus, the sound pressure level can be enhanced in a wider
frequency range by changing the position of the partition plate 213 for each layer and forming a
large number of resonance pipes having different pipe lengths. FIG. 6 is a view showing response
images of resonance tubes having different tube lengths. The response of the resonance tube
having the longest tube length L1 is C1, and the response of the resonance tube having the
second tube length L2 (<L1) is C2,. The response of a resonant tube having the k-th longest tube
length Lk is represented by Ck.
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[0023]
As is clear from FIG. 6 and the above equation (1), the basic resonance frequency is lowered
when the tube length L of the resonance tube is long, and the fundamental resonance frequency
is increased when the tube length L of the resonance tube is short. Using this characteristic, for
example, the length of the resonance pipe (the resonance pipe on the left side of the first layer)
formed by the opening 212L1 of the cabinet 210 of the first layer and the partition plate 213
shown in FIG. The length of the resonance pipe (the resonance pipe on the right side of the
second layer) formed by the opening 212R2 of the cabinet 210 of the second layer and the
partition plate 213 is set to L2 , and the cabinet 210 of the third layer is set. Set the length of
the resonance pipe (the resonance pipe on the left side of the third layer) formed by the opening
212L3 of the second part and the partition plate 213 to "L3", ... the opening 212R6 of the
cabinet 210 of the sixth layer The length of the resonance pipe (the resonance pipe on the right
side of the sixth layer) formed by the partition plate 213 is set to Lk . As described above, the
sound pressure level is enhanced in a wide frequency range by providing the partition plate 213
such that the balance of the tube lengths of the resonance tube formed on the left side and the
resonance tube formed on the right side becomes substantially even as a whole. To prevent
problems such as giving unnatural localization (for example, giving a non-natural localization
because the long resonance tube is biased to the left). Can.
[0024]
C. Others In the first embodiment described above, the case where the plurality of attachment
portions 211-k are provided on one long surface of the cabinet 210 has been described, but, for
example, as illustrated in FIG. k ′ (1 ≦ k ′ ≦ n) may be provided, and the speaker units 220-k
′ may be attached to the attachment portions 211. According to this configuration, as the
number of speaker units is increased, the power is increased and resonance is more likely to
occur. Further, the opening 212 may be provided only at one of the left and right ends. Here,
when the opening is provided only at one of the end portions, one resonance pipe may be formed
by one cabinet 210 without providing the partition plate 213. In addition, a plurality of partition
plates 213 may be provided inside the cabinet 210 according to the target frequency range (see
FIG. 8).
[0025]
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Further, in the second embodiment described above, the matrix array speaker device 200 ′
configured by simply stacking the line array speaker device 200 according to the first
embodiment vertically is illustrated, but for example, as shown in FIG. Holes 230 may be
provided at arbitrary positions on the upper and lower surfaces in the longitudinal direction to
form an acoustic maze. According to such a configuration, the resonance tube length can be set
long, and the power of the sound in the lower frequency range can be enhanced. The number of
cabinets 210 constituting the matrix array speaker device 200 and the number of speaker units
220-k attached to the cabinet 210 can be appropriately changed according to the design of the
speaker system and the like.
[0026]
It is a figure showing composition of an array speaker system concerning a 1st embodiment. It is
a figure which shows the structure of the cabinet edge part which concerns on the embodiment.
It is a figure for demonstrating the resonance phenomenon of the resonance pipe which concerns
on the embodiment. It is a figure which shows the structure of the audio reproduction apparatus
concerning the embodiment. It is a figure which shows the structure of the matrix array speaker
apparatus which concerns on 2nd Embodiment. It is a figure showing the response image of the
resonance pipe from which the pipe length concerning the embodiment differs, respectively. It is
a figure which shows the structure of the other line array speaker apparatus. It is a figure which
shows the structure of the other line array speaker apparatus. It is a figure which shows the
structure of another matrix array speaker apparatus. It is a figure which shows the structure of
the conventional speaker.
Explanation of sign
[0027]
100 ... array speaker system, 200 ... line array speaker device, 200 '... matrix array speaker
device, 210 ... cabinet, 211 ... mounting portion, 212 ... opening portion, 213 ... Partition plate
220 Speaker unit 300, 300 'Audio reproducing device 310 Decoder 320 filter means LPF low
pass filter HPF high pass filter 330 ... beam control means, 340 ... addition means, 350 ... delay
processing unit.
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