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JP2007028563

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DESCRIPTION JP2007028563
The present invention provides a speaker system having a sound generation structure close to a
spatial sound source in order to obtain more natural reproduced sound and sound field feeling in
stereo reproduction. The speaker unit 1 is disposed such that the vertical axis 2 penetrates the
sound source portions of the plurality of speaker units 1 and the sound axis direction of the
speaker unit 1 is radial around the vertical axis 2. At this time, in order to prevent the speaker
units 1 from overlapping each other, the plurality of speaker units 1 are arranged vertically
offset on the vertical axis 2. As a result, it is possible to realize a system having a structural
feature in which the vertical axis 2 becomes a virtual sound source and a cabinet having a
volume does not exist in the central portion of the sound source. As a result, a pseudo-spatial
sound source is formed which apparently has no volume in the sound source portion. At this
time, when the sound axis direction of the speaker unit 1 is set to 90 degrees with respect to the
vertical axis 2, a system having wide directivity in the horizontal direction can be realized.
[Selected figure] Figure 1
Omnidirectional speaker system
[0001]
The present invention relates to a nondirectional speaker system having an arrangement and a
structure of speaker units which can obtain natural stereo reproduction sound.
Technology background
[0002]
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1
In stereo reproduction, as a speaker system for obtaining more natural reproduction sound, it is
ideal to use a point sound source (space sound source) having wide directivity and reproduction
frequency characteristics and having no volume.
In order to get close to this, a non-directional speaker system in which a plurality of speaker
units are conventionally attached to a polygonal prism or a polyhedron, a sphere, or a nondirectional speaker system having a diffuser for diffusing sound on the front of the speaker unit
There has been a non-directional speaker system that diffuses sound by devising the shape of the
horn.
[0003]
These have the following disadvantages. (A) In order to attach a plurality of speaker units to one
polygonal column, polyhedron or sphere, the cabinet needs to have a certain size or more, and
the sound source becomes large and the outline of the sound image is blurred. (B) If you try to
make the cabinet smaller to solve this, the internal volume of the cabinet decreases and it
becomes difficult to reproduce the bass region, so it is difficult to achieve both the downsizing of
the cabinet and the ability to reproduce the bass region. (C) In a nondirectional speaker system
with a de-spacer, the sound is reflected once by the de-spacer, so the sound waves interfere and
deteriorate at the time of reflection, or the sound changes depending on the reflection
characteristics of the used de-spacer The inconvenience of having happened. (D) In the horn type
system, the horn opening is generally arranged 360 degrees in the horizontal direction, but due
to the characteristics of the horn, if the horn is to be made smaller, the reproducible frequency
band is the high-pitched part If you try to reproduce well to the low to middle range, the horn
becomes large, and it is difficult to miniaturize the sound source due to its structure. (E) Also, in
any of the methods of (I) (R) (C) (D), there is a volume, a structure with a volume, such as a
cabinet, a dephaser or a horn at the center of the sound source. In order to sound as if the sound
was generated from those structures, it was difficult to reproduce a space sound source that
sounds like a space. The present invention was made to eliminate these drawbacks.
[0004]
(A) By using a plurality of speaker units (1) and disposing the sound source portion at an equal
angle on a circular arc centered on the vertical axis (2) so that the vertical axis (2) penetrates,
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The vertical axis (2) itself is configured to form a virtual sound source having no apparent
volume. As a result, the volume of the sound source can be reduced, and a sounding structure
close to a space sound source can be obtained. (B) On the back of each speaker unit (1), it works
to rectify the sound wave generated from the back side to minimize the disturbance and
attenuation of the sound wave, and the sound wave generated from the back side interferes with
other speaker units Provide a first cabinet (4) that works to reduce (C) After the first cabinet (4),
a second cabinet (5) is provided to provide a volume necessary for the reproduction of the low
range and secure a wide reproduction range.
[0005]
By eliminating the apparent volume of the sound source, it is possible to obtain a natural sound
resounding like the space itself is sounding. In addition, by using a plurality of speaker units (1),
a wide directivity can be ensured, and the feeling of sound field necessary for stereo
reproduction is improved. Furthermore, the sound source positions of the speaker unit (1) are all
arranged on the vertical axis (2), and the size of the sound source does not exceed the width of
the speaker unit (1) in the horizontal direction. This makes it possible to obtain reproduced
sound excellent in sound image localization. This is because the human ear is more sensitive to
the dispersion of the sound source in the horizontal direction than in the vertical direction, and
as the width of the sound source is smaller, clearer sound image localization can be obtained.
This is the same even in the case where the sound axis of the speaker unit (1) is set to be
horizontal or the sound axis of the speaker unit (1) is set with an elevation angle or a depression
angle. The first cabinet (4) functions to rectify the sound wave generated from the back of the
speaker unit (1) and guide it to the second cabinet (5) without attenuation from its shape and
structure, and the back of the plurality of speaker units (1) It has a function of reducing direct
interference between the sound waves generated from the rear surface, and as a result, a rear
sound wave with less turbidity can be obtained. As a result, when using the cabinet type of the
type in which the back acoustic wave also has an influence on the quality of the reproduced
sound, such as the bass reflex type, the drone cone type, and the back loading type, the overall
sound quality can be improved. In addition, for sound waves generated from the front of the
speaker unit (1), minimizing the cross-sectional area of the portion to which the speaker unit (1)
of the first cabinet (4) is attached; By providing a device such as the above, it is possible to obtain
better directivity without interfering with the diffraction effect of the sound wave. Furthermore,
since it is connected to the second cabinet (5) whose internal volume and cabinet type can be
freely set, it is easy to secure the reproduction capability of the bass region necessary for
practical use. As a result, it is possible to obtain a reproduced sound having a clear sound image
localization, a wide reproduction range, and a natural sound field.
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[0006]
(A) A plurality of speaker units (1) are equally spaced equally on an arc centered on the vertical
axis (2) (for example, an angle of 120 degrees for three speaker units (1), an angle of 90 degrees
for four Arrange radially in). (FIG. 7) (FIG. 10) If it is desired to adjust the directivity of the system
depending on the application of the speaker system, the arrangement angles of the speaker units
(1) may be set to be unbalanced. (B) At this time, the sound source position of each speaker unit
(1) is arranged so that the vertical axis (2) vertically penetrates. The sound source position of the
speaker unit (1) is a cone paper or voice coil portion in the case of a dynamic type speaker, and
in the case of other driving methods, a portion closest to the driving portion in the portion where
the sound wave is generated is a guide. Finally, it is desirable to make adjustments through
hearings. (Fig. 7) (Fig. 10) (C) Note that if multiple speaker units (1) are placed on the same plane
as in (A) or (B), the speaker units (1) will overlap with each other. In order to avoid this, the
speaker units (1) are vertically displaced (usually at regular intervals). (FIG. 5) (FIG. 6) (FIG. 8)
(FIG. 9) (D) Also, the arrangement of the speaker unit (1) is such that the sound axis direction is
90 degrees with respect to the vertical axis (2) (ie horizontal In principle, if you want to give a
wide directivity in the vertical direction as well, etc., the speaker unit (1) should be satisfied if the
conditions of (a) (b) (b) (c) are satisfied. An elevation angle or a depression angle may be
provided in the direction of the sound axis. (E) The arranged speaker units (1) use the same type
and the same specification, and perform the same operation with the same phase and sound
pressure. (F) However, when using the multi-way method as in (Fig. 3), the medium and high-tone
speaker units (11) operate in the same phase and with the same sound pressure, but the bass
speaker unit (12) is actually It is desirable to adjust the phase and sound pressure by listening to
it. (G) A first cabinet (4) is provided on the back of each speaker unit (1). The first cabinet (4) is
based on a cylinder or a cone, and in the part where the speaker unit (1) is attached, in particular,
the cross-sectional area can be minimized to promote the diffraction effect of the sound wave.
You can get a wider directivity. At this time, install a ring for promoting diffraction (9) whose
cross section is semicircular, etc. around the diaphragm of the speaker unit (1) and connect it to
the first cabinet (4) smoothly, etc. The diffraction effect of the front acoustic wave can be further
smoothed.
(Fig. 11) (1) The inside of the first cabinet (4) should be gently tapered if its shape is a cylindrical
tube so that the first cabinet (4) does not resonate at a specific frequency In addition, by
gradually increasing the cross-sectional area, the sound wave is prevented from being attenuated.
At this time, in order to enhance the rectification effect of the back surface acoustic wave, a shellshaped rectifying body (3) is directly installed on the back of the magnet of the speaker unit (1),
or a support (8 in the first cabinet (4) You may install in the form supported by. (Fig. 11) Also, if
the first cabinet (4) requires a straight pipe portion (13) without taper, the shell type to prevent
unnecessary resonance from occurring in this portion The rectifier (3) may be installed directly
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on the back of the magnet of the speaker unit (1), or may be installed in the first cabinet (4) by
being supported by the support (8). (Fig. 11) (1) The overall shape of the first cabinet (4) should
be handled as far as possible so as not to impede the progress of sound waves generated from
the front of each speaker unit (1). Make a shape like drawing a curve. (FIG. 1) (FIG. 2) (FIG. 3)
(FIG. 4) (2) A second cabinet (5) is connected to the rear end of the first cabinet (4). The second
cabinet (5) provides a volume for securing the reproduction capability in the low frequency
range, and can use a conventional cabinet type such as a closed type, bass reflex type, drone cone
type, back loading horn type and the like. (Figure 1) (Figure 2) (Figure 3) (Figure 4)
[0007]
FIG. 1 shows an embodiment in which three speaker units (1) are used and the second cabinet (5)
uses a bass reflex system. By arranging the opening of the bass reflex duct (7) so that the vertical
axis (2) penetrates the central portion, diffusion of the sound source can be prevented and an
effect of improving sound image localization can be expected.
[0008]
FIG. 2 shows an embodiment in which three speaker units (1) are used, and the second cabinet
(5) uses a drone cone system. By arranging the central part of the drone cone unit (10) so that
the vertical axis (2) penetrates, diffusion of the sound source can be prevented and an effect of
improving sound image localization can be expected.
[0009]
(Fig. 3) is an example of the case where the present speaker system is configured in a multi-way
system, and a two-way embodiment using three middle to high-tone speaker units (11) and one
bass speaker unit (12). It is. In (Fig. 3), the second cabinet (5) is divided into two layers, the upper
part is used for back pressure adjustment of the middle high / low sound speaker unit (11), and
the lower part is closed type of the low sound speaker unit (12). They are used as cabinets, but
their cabinet type and volume ratio may be changed according to the characteristics of the units
used, and in some cases, the first cabinet (4) and the second cabinet of the mid-high range
speaker unit (11) In some cases it is better to separate 5) completely and use them
independently. Further, by arranging the low-pitched speaker unit (12) so that the vertical axis
(2) penetrates the central portion, diffusion of the sound source can be prevented and an effect
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5
of improving sound image localization can be expected.
[0010]
FIG. 4 shows an embodiment in which four speaker units (1) are used and the second cabinet (5)
uses a bass reflex system. In addition to the drone cone type and the closed type in the cabinet
type as in (0008) and (0009), a back loading horn type can be used, and variations such as a
multi-way type can be made in the speaker unit portion. . By arranging the opening of the bass
reflex duct (7) so that the vertical axis (2) penetrates the central portion, diffusion of the sound
source can be prevented and an effect of improving sound image localization can be expected.
[0011]
It is a perspective view in the case of using three speaker units (1) and using a bass reflex system
for the 2nd cabinet (5). In addition, the expression of board thickness is omitted for simplification
of expression. It is a perspective view in the case of using three speaker units (1) and using a
drone cone system for the second cabinet (5). In addition, the expression of board thickness is
omitted for simplification of expression. It is a perspective view in the case of using an enclosed
type system for a 2nd cabinet (5) using the structure of a speaker unit using a multi-way (this
case 2 way) system. In addition, the expression of board thickness is omitted for simplification of
expression. It is a perspective view in the case of using four speaker units (1) and using a bass
reflex system for a cabinet (5). In addition, the expression of board thickness is omitted for
simplification of expression. It is a front view showing arrangement of each unit in the case of
using three speaker units (1). It is a side view showing arrangement of each unit in the case of
using three speaker units (1). It is a top view showing arrangement of each unit in the case of
using three speaker units (1). It is a front view showing arrangement of each unit in the case of
using four speaker units (1). It is a side view showing arrangement of each unit in the case of
using four speaker units (1). It is a top view showing arrangement of each unit in the case of
using four speaker units (1). It is sectional drawing of the part which attaches a speaker unit (1)
to a 1st cabinet (4).
Explanation of sign
[0012]
DESCRIPTION OF SYMBOLS 1 speaker unit 2 vertical axis 3 rectifying body 4 first cabinet 5
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second cabinet 6 legs 7 bass reflex duct 8 support 9 ring for diffraction promotion 10 drone
cone unit 11 mid-high tone speaker unit 12 bass speaker unit 13 straight pipe
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