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JPH11205883

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH11205883
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker system using a plurality of loudspeaker units.
[0002]
2. Description of the Related Art In recent years, in order to secure speech intelligibility mainly
for professional use speakers, a speaker system is used which controls directivity over a wide
frequency band. One of them is a speaker system in which one speaker unit is disposed at each
of the left and right on the horizontal axis of the front of the enclosure (cabinet) and the upper
and lower sides on the vertical axis, as disclosed in JP-A-5-260583. . The conventional speaker
system will be described below with reference to FIG. In the figure, reference numerals 28, 29,
30, 31 denote speaker units for reproducing the same frequency band, and these speaker units
are arranged at intervals in the vertical axis on the vertical axis and in the horizontal axis on the
horizontal axis. By separating the vertical and horizontal intervals of the speaker unit, the size of
the virtual sound source of the speaker system can be increased, and the directivity angle can be
narrowed from a low frequency band to reduce the reflected sound from the room wall and
reduce the audio clarity. It is intended to improve.
[0003]
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The directivity angle frequency characteristics of the low frequency speaker unit of such a
conventional speaker system are shown in 5 and 7 of FIG. In FIG. 2, 5 is the directivity angle
frequency characteristic of the low frequency band speaker unit, and 7 is the directivity angle
frequency characteristic of the low frequency speaker unit in the high frequency band. This
characteristic is a directivity angle frequency characteristic obtained in the horizontal direction of
the speaker system when four 16 cm aperture speaker units are arranged at a vertical interval of
470 mm and a horizontal interval of 330 mm. The horizontal target directivity angle θ of this
speaker system is 90 °, and the directivity angle of the speaker system is narrow at 200 Hz to
800 Hz which is the non-directional band of a normal 16 cm aperture speaker unit. It was
effective in showing close directivity. In addition, the directivity angle said by this specification is
defined as an angle which falls 6 dB with respect to the sound pressure on front axis.
[0004]
Furthermore, in the conventional speaker system, an example in which a high frequency speaker
unit is disposed at the center of the above arrangement, or a constant directivity horn exhibiting
a constant directivity angle over a wide frequency band instead of the high frequency speaker
unit is disposed. There is an example. The example taken in FIG. 8 is an example in which the
constant directivity horn 32 is disposed.
[0005]
However, although the speaker system of this type is effective in that the directivity angle can be
narrowed in the low frequency band, the directivity angle is high in the high frequency band of
the plurality of loudspeaker units arranged. There was a problem of getting too narrow. That is,
as indicated by 7 in FIG. 2, in the frequency band of 800 Hz or more, the directivity angle
narrows in proportion to the frequency, and the difference with the target directivity angle θ
becomes a problem. In order to solve this problem, in the above-described conventional example,
a speaker system with a two-way configuration is used, and a high directivity directional horn is
disposed at the center, and the directivity angle of the low frequency speaker unit becomes too
narrow. Were cut off by a crossover network, and a high frequency band was reproduced by a
constant directivity horn, and directivity angle frequency characteristics close to a target
directivity angle were realized over the entire frequency band.
[0006]
In such a method, the high frequency horn is fI = 28000 / (θ × a) (1) fI: lower limit frequency
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θ of directivity control of the constant directivity horn: target directivity angle a: directivity The
directivity angle is θ and constant above the frequency fi indicated by the aperture diameter in
the control direction, but at frequencies below that, the horizontal and vertical directivity angles
have the same shape as the horn aperture. Equal to the pointing angle of
[0007]
FIG. 10 is a diagram showing how the directivity angle changes as the size of the flat plate sound
source changes, and shows the directional angle frequency characteristics when the radius of the
circular flat plate sound source is changed.
The directivity angle of the flat plate sound source becomes wider as the frequency becomes
lower as shown at 37. In this figure, 37 is the directivity angle when the radius of the circular flat
plate is a, 38 is the directivity angle when the radius of the circular flat plate is 2a, and 39 is the
directivity angle when the radius of the circular flat plate is 3a. It can be seen that the directivity
angle becomes narrower from the low band as the sound source becomes larger.
[0008]
On the other hand, even in the reproduction band of the low band speaker unit, the directivity
angle is the same as that of an elliptical flat plate sound source having the vertical diameter for
the low frequency speaker unit in the vertical direction and the horizontal diameter for the
speaker unit in the horizontal direction. Indicates Here, since the low-range speaker unit is
disposed outside the high-range constant directivity horn, the size of the flat plate sound source
is larger than that of the horn opening, and the entire frequency is indicated by 33 in FIG. It
becomes narrower than the directivity angle 34 of the high directivity constant directivity horn
in the band.
[0009]
Therefore, as for the directivity angle as a speaker system in the case of using a crossover
network, the directivity angle of the high frequency horn is aimed at a frequency just above the
crossover frequency as shown at 35 when the crossover frequency is low f1. When the crossover
frequency is high f 2, the low-range speaker unit's directivity is narrow relative to the target
directivity angle θ in the frequency band immediately below the crossover frequency as shown
at 36. As a result, there is a problem that the directivity angle frequency characteristic is
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disturbed near the crossover frequency.
[0010]
The present invention solves such a conventional problem, solves the problem that the directivity
angle becomes narrow in the high frequency band of a plurality of arranged speaker units, and
the horizontal directivity angle is constant from low frequency range to high frequency range It
is an object of the present invention to provide a speaker system that
[0011]
SUMMARY OF THE INVENTION In order to solve this problem, the speaker system of the present
invention has two or more speaker units disposed symmetrically on the enclosure horizontal axis
and vertically symmetrical disposed on the enclosure vertical axis. The speaker unit has two or
more speaker units, and the speaker units reproduce the same frequency band, and the center
position on the diaphragm of the speaker unit arranged on the horizontal axis is arranged on the
vertical axis. It is arranged behind the central position on the diaphragm.
According to the present invention, the directivity angle does not become too narrow in the high
frequency band of the plurality of arranged speaker units, and in the speaker system of the 2way configuration in which the high frequency speaker unit is arranged on the central axis of the
speaker system, The effect of reducing the disturbance of the directivity angle frequency
characteristic near the crossover frequency is obtained.
[0012]
DETAILED DESCRIPTION OF THE INVENTION According to the first aspect of the present
invention, there are provided two or more speaker units arranged symmetrically on the enclosure
horizontal axis and two arranged symmetrically on the enclosure vertical axis. The above speaker
units are provided, and the speaker units reproduce the same frequency band, and the center
position on the diaphragm of the speaker unit disposed on the horizontal axis is the center on the
diaphragm of the speaker unit disposed on the vertical axis It is a speaker system characterized
by being arranged behind the position.
In this configuration, when viewed in a horizontal cross section, the speaker unit disposed on the
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vertical axis functions in the same manner as the virtual sound source is disposed on the central
axis of the speaker system. Then, on the left and right sides, there is a sound source from the
speaker unit on the horizontal axis arranged such that the center position on the diaphragm is
behind the center position on the diaphragm of the speaker unit on the vertical axis. Therefore,
these sound sources constitute an arc-shaped sound source in the horizontal direction of the
speaker system. An arc sound source solves the problem that the directivity in a high frequency
band is wider than a linear sound source, and the directivity angle becomes narrower than the
target directivity angle in a high frequency band, which was a drawback of the conventional
speaker system. In the two-way speaker system in which the high-frequency speaker unit is
disposed on the central axis, there is an effect of reducing the disturbance of the directivity angle
frequency characteristic in the vicinity of the crossover frequency.
[0013]
The invention according to claim 2 of the present invention is the vibration of the speaker units
of the upper and lower ends arranged on the vertical axis at intervals of the center positions on
the diaphragm of the speaker units of the left and right ends arranged on the enclosure
horizontal axis. The speaker system according to claim 1, characterized in that it is narrower than
the distance between the center positions on the board. These speaker units have the same
horizontal distance between the speaker units at both ends in the horizontal direction by
reproducing the same band, and have the same distance between the speaker units at both ends
in the vertical direction as the vertical flat sound source Indicates the pointing angle of The
distance between the center positions on the diaphragms of the left and right speaker units
disposed on the horizontal axis is smaller than the distance between the center positions on the
diaphragms of the upper and lower speaker units disposed on the vertical axis Thus, it is possible
to widen the horizontal directional angle, narrow the vertical directional angle, and make the
horizontal and vertical directional angles different.
[0014]
The invention according to claim 3 of the present invention is characterized in that a speaker
unit for reproducing a higher frequency band than the speaker units arranged on the horizontal
axis and the vertical axis is arranged on an enclosure center axis. It is a speaker system according
to item 1 or 2. Even if the invention according to claim 1 is carried out, the directivity angle can
be broadened by reproducing the high frequency region where the directivity angle becomes
narrow when reproduction is performed by a plurality of speakers by the high frequency speaker
unit, and a speaker system The horizontal directional angle can be broadened in the entire band
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of
[0015]
In the invention according to claim 4 of the present invention, the speaker unit on the vertical
axis is disposed on the front of the enclosure, and the left and right of the front have an
outwardly inclined surface continuous to the front, and the horizontal axis along the surface The
speaker system according to claim 1, wherein the upper speaker unit is disposed. The center
position on the diaphragm of the speaker unit on the horizontal axis is the vibration of the
speaker unit on the vertical axis by continuously providing the surfaces inclined outward on both
sides of the front and arranging the speaker unit in the inclined state It is arranged behind the
central position on the board. In addition, since the left and right speaker units on the horizontal
axis are arranged on the surface continuous to the front, there is no upright wall on the front of
the enclosure, and the characteristic disturbance due to this can be eliminated. In addition, there
is also an advantage that the number of enclosure faces is reduced in manufacturing and easy to
manufacture, and the width of the enclosure is also smaller than when all the speaker units on
the horizontal axis are attached to the front.
[0016]
The invention according to claim 5 of the present invention is characterized in that the speaker
unit for reproducing the high frequency is disposed on the front, has a surface inclined to the
outside continuous to the front at the top and bottom, and the speaker unit on the vertical axis It
has an outwardly inclined surface which is disposed along the left and right of the front, and the
inclination of the surface is larger than the inclination of the outward facing surface in the
vertical direction, and the speaker unit on the horizontal axis The speaker system according to
claim 3, wherein the speaker system is disposed along a surface. By tilting the speaker unit on
the vertical axis outward, the height of the speaker system can be made smaller than in the case
where the speaker unit is not tilted.
[0017]
The invention according to claim 6 of the present invention is characterized in that the upper and
lower and / or left and right outer peripheral portions of the front surface of the enclosure are
provided with an edge portion projecting forward than the speaker unit mounting surface. It is a
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speaker system given in either. By providing the edge projecting forward beyond the speaker
unit attachment surface, even when the speaker is placed on the floor with the speaker unit face
down, the speaker unit is protected by the edge.
[0018]
The invention according to claim 7 of the present invention is the speaker system according to
claim 6, characterized in that the vicinity of the speaker unit at the edge is cut away, and the
edge is not cut when the edge is not cut out. It has the effect of preventing the sound wave
emitted from the low-range speaker unit from being disturbed by the unit from disturbing the
directivity and frequency characteristics of the speaker system.
[0019]
The invention according to claim 8 of the present invention is the speaker system according to
claim 7, characterized in that the front surface of the enclosure is covered with a net.
Since the notch portion of the edge portion is covered with the net, there is an effect of
preventing the protrusion or the like from entering the front of the speaker from the notch
portion of the edge portion and breaking the speaker unit.
[0020]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. (First Embodiment) A first embodiment of the present invention is shown in FIG. In the
first embodiment, as described in claim 1, two or more speaker units 3 and 4 symmetrically
arranged on the enclosure horizontal axis and two vertically arranged on the enclosure vertical
axis. The above speaker units 1 and 2 are provided, and the speaker units reproduce the same
frequency band, and the central position on the diaphragm of the speaker units 3 and 4 arranged
on the horizontal axis is arranged on the vertical axis It arrange | positions behind the central
position on the diaphragm of the speaker units 1 and 2. As shown in FIG. In the present
embodiment, the center position on the diaphragm of the speaker units 3 and 4 in the left and
right direction is disposed rearward in the range of 10 to 200 mm with respect to the center
position on the diaphragm of the speaker units 1 and 2 in the vertical direction. .
03-05-2019
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[0021]
According to the second aspect of the present invention, the speaker units 3 and 4 at the left and
right ends disposed on the horizontal axis of the enclosure have speaker units 3 and 4 at
intervals of the center position on the diaphragm. It is set narrower than the interval of the
center position on the diaphragm of. In the present embodiment, the upper and lower speaker
units 1 and 2 are disposed at a distance of 470 mm from the center, and the left and right
speaker units 3 and 4 are disposed at a distance of 330 mm from the center. The distance
between the speaker units 1 and 2 in the vertical direction determines the vertical directivity
angle in the low band 800 Hz or less, and the distance between the speaker units 3 and 4 in the
horizontal direction determines the horizontal directivity angle in the low band 800 Hz or less.
The target directivity angle of this speaker system is 90 degrees in the horizontal direction and
40 degrees in the vertical direction, and in order to make the horizontal directivity angle in the
low range wider than the vertical directivity angle, the horizontal speaker unit spacing Is narrow.
The distance between the upper and lower speaker units and the distance between the left and
right speaker units are determined in consideration of the target directivity angle, and the range
is 100 to 2000.
[0022]
FIG. 2 is a graph comparing the directivity angle frequency characteristics in the horizontal
direction in the present embodiment with the conventional example. The directivity angle
frequency characteristic 5 in the low band 800 Hz or less is determined by the horizontal interval
of the speaker unit. Since the center position on the left and right low-range speaker unit
diaphragms is disposed behind the center position of the upper and lower low-range speaker
units, the horizontal direction of the conventional speaker system is between 800 Hz and 2.5
kHz. The directivity angle is wider than the directivity angle 7, and the directivity angle
frequency characteristic 6 closer to the target directivity angle is shown. This is equivalent to the
virtual sound source 27 being arranged on the speaker system central axis of the speaker units 1
and 2 in the vertical direction when the arrangement of the sound sources is seen in the
horizontal cross section as shown in FIG. And configure an arc-shaped sound source together
with the left and right speaker units 3 and 4 to make the directivity angle of the high range of the
reproduction band of the low range speaker unit wider than that in the case where three sound
sources are linearly arranged. To maintain the angle of Thereby, the horizontal directivity angle
can be made constant in a wide frequency range.
[0023]
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8
Second Embodiment FIG. 3 shows a second embodiment of the present invention. In the second
embodiment, the positional relationship between the low-range speaker units 1, 2, 3 and 4 is the
same as that of the first embodiment shown in FIG. A feature of the second embodiment resides
in that the constant directivity horn 8 is disposed on the central axis of the enclosure as a
speaker unit for reproducing a high frequency as described in claim 3 of the present invention.
The horizontal diameter of the opening of this horn is 170 mm, and according to equation (1),
this horn can maintain a constant directivity of 90 degrees at 1.8 kHz or more. Therefore, the
crossover frequency of the speaker system is preferably 1.8 kHz or more. As shown in the first
embodiment of the present invention, the directivity angle frequency characteristics of the lowrange speaker unit substantially indicate 90 degrees of the target directivity angle at 800 Hz to
2.5 kHz as indicated by 6 in FIG. When the crossover frequency is 8 kHz, the directivity angle
frequency characteristic takes a value close to the target directivity angle even near the crossover
frequency and is kept constant. FIG. 6 shows the directivity angle frequency characteristic 26 in
the horizontal direction of the speaker system of FIG. It can be seen that the directivity angle
frequency characteristic is constant at a value close to the target directivity angle even near the
crossover frequency.
[0024]
(Third Embodiment) FIG. 4 (a) is a perspective view of a third embodiment of the present
invention, and FIG. 4 (b) is a perspective view in the horizontal direction seen from the top
surface of FIG. 4 (a). In the third embodiment, as described in claim 4, the speaker units 1 and 2
on the vertical axis are disposed on the enclosure front surface 11, and on the left and right of
the front surface 11, the surfaces 9 are inclined outward continuously to the front surface. , 10,
on the surface of which speaker units 3, 4 on the horizontal axis inclined outward are arranged.
In the speaker system according to the second embodiment of the present invention shown in
FIG. 3, the wall surfaces of the speaker units 3 and 4 are steep, and reflection of the sound wave
from the speaker units 3 and 4 occurs. And disturb the directional angle frequency
characteristics. Therefore, in the third embodiment, the surfaces 9 and 10 inclined outward are
continuously provided on both sides of the front surface 11 and the speaker units 3 and 4 are
disposed there so that the steep wall does not exist. By thus arranging the speaker units 3 and 4
in an inclined manner, the central position 13 on the diaphragm of the speaker units 3 and 4 on
the horizontal axis is the center on the diaphragm of the speaker units 1 and 2 on the vertical
axis. It is located behind position 12. Therefore, as in the first and second embodiments, it is
possible to eliminate the disturbance of the characteristic due to the steep wall while realizing a
wide directivity angle in the high frequency band of 800 Hz to 2.5 kHz of the low frequency
speaker unit. it can. In addition, the number of sides of the enclosure is reduced in
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manufacturing, and there is an advantage that it is easy to manufacture, as well as the advantage
that the width of the enclosure is smaller than when all the speaker units 3 and 4 on the
horizontal axis are attached to the front.
[0025]
(Fourth Embodiment) FIG. 5 is a perspective view of a fourth embodiment of the present
invention. In the fourth embodiment, as described in claim 5 of the present invention, the
constant directivity horn 8 is disposed on the front surface 11 as a speaker unit for reproducing
a high frequency region, and is inclined upward and downward continuously to the front surface
11 The speaker units 1 and 2 on the vertical axis are arranged in the state of being inclined
outward on the surface, and further, the surfaces 9 and 10 continuous to the left and right of the
front 11 are provided. The inclination of the surface is larger than the inclination of the outward
facing surfaces 14 and 15 in the vertical direction, and the speaker units 3 and 4 on the
horizontal axis are on the surface than the speaker units 1 and 2 on the vertical axis It is
arranged to be inclined outward at a large angle. The height of the speaker system can be
reduced by inclining the low-range speaker units 1 and 2 in the vertical direction to the outside.
[0026]
Further, as described in claim 6, this speaker system is provided with edge portions 16, 17, 18
and 19 projecting forward beyond the speaker unit mounting surface on the upper, lower, left
and right outer peripheral portions of the front surface of the enclosure. Therefore, even when
the speaker is placed on the floor with the speaker unit face down, the speaker unit is protected
by the edge.
[0027]
Furthermore, as described in claim 7, this speaker system has notches 20, 21, 22, 23 at the edge
near the low frequency speaker unit, and the edge radiates from the low frequency speaker unit
Sound waves to prevent the directivity and frequency characteristics of the speaker system from
being disturbed.
[0028]
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Further, as described in claim 8, the enclosure front surface is covered with the front surface net
24, the outer peripheral portion thereof is bent, and the inside of the front and edge notches 20,
21, 22 and 23 is folded. Portion 25 is provided.
Therefore, there is an effect of preventing the protrusion or the like from coming into the front of
the speaker from the notch portion of the edge and breaking the speaker unit.
[0029]
As described above, according to the present invention, it is possible to realize a speaker system
in which the directivity angle in the horizontal direction exhibits a constant value in a wide
frequency range, and the disturbance of the directivity angle frequency characteristics is small. A
speaker system having a structure in which the speaker unit does not easily break down can be
realized.
[0030]
Brief description of the drawings
[0031]
1 is a perspective view of the speaker system according to the first embodiment of the present
invention
[0032]
Fig. 2 Characteristics of the horizontal directional angle frequency characteristics of the low
frequency speaker unit of the speaker system according to the first to fourth embodiments of the
present invention and the conventional speaker system
[0033]
3 is a perspective view of the speaker system according to the second embodiment of the present
invention.
[0034]
FIG. 4A is a perspective view of a speaker system according to a third embodiment of the present
invention.
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[0035]
5 is a perspective view of the speaker system according to the fourth embodiment of the present
invention.
[0036]
Fig. 6 Characteristics of horizontal directional angle frequency characteristics of the speaker
system according to the first to fourth embodiments of the present invention
[0037]
Fig. 7 is a schematic diagram showing virtual sound source arrangement in a horizontal cross
section of the speaker system according to the third embodiment of the present invention.
[0038]
Fig. 8 A perspective view of the conventional speaker system
[0039]
FIG. 9 (a) is a characteristic diagram of horizontal directional angle frequency characteristics of
the low frequency speaker unit and the high frequency horn of the conventional speaker system.
[0040]
Fig. 10 Characteristic diagram of directivity angle frequency characteristics of circular flat plates
with different radius
[0041]
Explanation of sign
[0042]
1, 2, 3, 4, 12, 13, 28, 29, 30, 31 Speaker units 5, 6, 7, 26, 33, 34, 35, 36, 37, 38, 39 Directional
angle frequency characteristics 8, 32 high Zone directed horns 9, 10, 14 and 15 Continued to the
front of the enclosure 11 Front of the enclosure 16, 17, 18 and 19 Edge 20, 21, 22 and 23 Notch
24 on the edge Front net 25 Front net Outer peripheral fold
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