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JP2004320100

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DESCRIPTION JP2004320100
An array type speaker device capable of easily narrowing the directivity in the arrangement
direction of the speaker units over a wide band up to a high frequency range or a low frequency
range without losing the overall sensitivity. An array type speaker device according to the
present invention includes a rectangular speaker box 12 and a plurality of speaker units 11
provided in the speaker box 12 and arranged in a line and having different vertical and
horizontal lengths. The unit 11 is configured to be arranged in parallel in the longitudinal
direction. [Selected figure] Figure 1
Array type speaker device
[0001] The present invention relates to an array-type speaker device in which speaker units are
arranged in a line, and in particular, pointing of the arrangement direction of the speaker units
over a wide band up to a high frequency range and a low frequency range. The present invention
relates to an array type speaker device which can be easily narrowed without losing the overall
sensitivity. [0002] A conventional array-type speaker device has directivity such that strong
sound pressure can be obtained in a specific area, for example, when explaining at a booth in an
exhibition hall, or at the home of an adjacent station When making different announcements, it is
used to make it easy to hear voice (see, for example, Patent Document 1). FIG. 4 shows a plan
view and a cross-sectional view of a conventional array-type speaker device. As shown in FIG. 4,
in the conventional array-type speaker device 30, a plurality of speaker units 31 are arranged at
equal intervals in a line shape in the speaker box 32 to obtain narrow directivity of sound. When
the speaker units 31 are arranged in a line as described above, the directivity in the direction of
arrangement of the speaker boxes 32 becomes narrow, and it is possible to make it easy to hear
voice in a specific area. [0006] As described above, the conventional array-type speaker device
30 includes a plurality of speaker units in the speaker box 32. 31 are arranged at equal intervals
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in a line shape to obtain narrow directivity of sound. However, in the conventional array type
speaker device 30, side lobes are generated in the high frequency sound range where the
wavelength of the sound wave becomes shorter than the speaker unit interval P 3 of the speaker
unit 31, and directivity in the arrangement direction is expanded The directivity of the
arrangement direction is influenced by the aperture of the unit 31. In order to obtain narrow
directivity even in the high frequency range, it is necessary to reduce the speaker unit interval P3
by using the speaker unit 31 with a small aperture, so there is a problem that the vibration area
decreases and the overall sensitivity decreases. . Further, the directivity of the low frequency
range can be narrowed as the array length P 4 in the arrangement direction of the peaker unit
31 is longer, but the vibration area is maintained and the entire sensitivity is not lowered to
narrow the low frequency range. In order to obtain directivity, the speaker unit 31 has to be
added, and there is a problem that the configuration becomes complicated. The present invention
has been made to solve such conventional problems, and loses the overall sensitivity to the
directivity of the arrangement direction of the speaker units over a wide band up to the high
frequency range and the low frequency range. It is an object of the present invention to provide
an array-type speaker device which can be easily narrowed without.
According to the present invention, there is provided an array type speaker device comprising: a
rectangular speaker box; and a plurality of speaker units provided in the speaker box and
arranged in a line and having different vertical and horizontal lengths. The plurality of speaker
units have a configuration in which longitudinal directions are arranged in parallel with each
other. According to this configuration, it is possible to reduce the speaker unit interval and easily
narrow the directivity in the arrangement direction of the speaker units to the high frequency
range without losing the overall sensitivity. Further, the plurality of speaker units have a
configuration for performing setting of electrical weighting that reproduces the reproduction
sound pressure level more as the speaker unit at the center part. According to this configuration,
the directivity in the arrangement direction of the speaker units can be narrowed further to the
high frequency range. Further, the plurality of speaker units have a configuration for performing
electrical weighting control to reproduce the reproduction sound pressure level more as the
speaker unit in the central portion. According to this configuration, it is possible to perform
adjustment to narrow the directivity in the arrangement direction of the speaker units to the high
frequency range. Further, the speaker units having different vertical and horizontal lengths have
an oval or rectangular shape. According to this configuration, it is possible to properly adjust the
speaker units having different vertical and horizontal lengths. Furthermore, the array type
speaker device of the present invention includes a rectangular speaker box, and a plurality of
speaker units provided in the speaker box and arranged in a line and having different vertical
and horizontal lengths, and the plurality of speakers The units have a configuration in which the
longitudinal directions are arranged linearly with one another. According to this configuration,
the arrangement length of the speaker units can be extended, the directivity in the arrangement
direction of the speaker units can be narrowed to the low frequency range, and the vibration area
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is secured to prevent the overall sensitivity from being impaired. be able to. DETAILED
DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described
below with reference to the drawings. FIG. 1 shows a plan view and a cross-sectional view of an
array type speaker device according to a first embodiment of the present invention. As shown in
FIG. 1, in the array type speaker device 10 according to the first embodiment of the present
invention, a plurality of speaker units 11 having different horizontal lengths 11 a and vertical
lengths 11 b are formed in a line. Are equally spaced and attached to the rectangular speaker box
12.
The speaker units 11 are arranged such that the longitudinal directions in the direction of the
horizontal length 11a are parallel to each other. As the speaker unit interval P1 of the speaker
unit 11 of the sound source is smaller, the linear sound source theory holds up to the high
frequency range, and the directivity in the arrangement direction of the speaker units can be
narrowed to the high frequency range. In the array type speaker device 10 according to the first
embodiment of the present invention, a plurality of speaker units 11 having different horizontal
length 11a and vertical length 11b are made parallel in the longitudinal direction of the
horizontal length 11a. Since the lines are arranged at equal intervals, the vibration area can be
secured or enlarged to make the speaker unit interval P1 of the speaker units 11 smaller, and the
directivity in the arrangement direction of the speaker units can be narrowed to the high
frequency range. In FIG. 1, in the array type speaker device 10 according to the first embodiment
of the present invention, the speaker units 11 are arranged in the speaker box 12 at equal
intervals in the vertical direction. You can also use it by turning it sideways. The speaker units 11
having different lengths in the vertical and horizontal directions can also be formed in an oval or
rectangular shape. As described above, in the array type speaker device 10 according to the first
embodiment of the present invention, a plurality of speaker units 11 having different lengths in
the vertical and horizontal directions are formed in a line shape with their longitudinal directions
parallel to one another. By arranging, the directivity in the arrangement direction of the speaker
units can be easily narrowed to the high frequency range without impairing the overall
sensitivity. FIG. 2 shows a block circuit diagram used in the array-type speaker device of the first
embodiment of the present invention. As shown in FIG. 2, the block circuit used in the array type
speaker device 10 according to the first embodiment of the present invention of the present
invention includes an output amplifier 16 for amplifying an audio signal input to the terminal 17
A plurality of attenuators 15 are respectively inserted between the output amplifier 16 and the
plurality of speaker units 11. The plurality of attenuators 15 are set so as to attenuate the audio
signal from the output amplifier 16 so that the sound pressure of the central speaker unit 11 is
maximized. Therefore, electrical weighting is performed so as to reproduce the reproduction
sound pressure level as large as the central speaker unit 11, and the directivity in the
arrangement direction of the speaker units 11 can be set narrower.
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In addition, a control unit (not shown) that adjusts the plurality of attenuators 15 and changes
the weighting can be provided to freely control the directivity in the arrangement direction of the
speaker units 11. FIG. 3 shows a plan view and a cross-sectional view of an array-type speaker
device according to a second embodiment of the present invention. As shown in FIG. 3, in the
array type speaker device 20 according to the second embodiment of the present invention, a
plurality of speaker units 21 different in length and width are arranged at equal intervals in a
line shape, It is attached to a rectangular speaker box 22. The speaker units 21 have the same
longitudinal direction and are arranged linearly. As the array length P2 of the speaker unit 21 of
the sound source is longer, the linear sound source theory holds up to the low frequency range,
and the directivity in the direction of arrangement of the speaker units can be narrowed to the
low frequency range. In the array type speaker device 20 according to the second embodiment of
the present invention, the longitudinal directions of the plurality of speaker units 21 having
different lengths in the vertical and horizontal directions are the same direction, and are linearly
arranged at equal intervals. The vibration area can be secured or enlarged to increase the
arrangement length P2 of the speaker units 21, and the directivity in the arrangement direction
of the speaker units can be narrowed to a low frequency range. In FIG. 3, in the array type
speaker apparatus 20 according to the second embodiment of the present invention, the speaker
units 21 are arranged in the speaker box 22 at equal intervals in the vertical direction. You can
also use it by turning it sideways. Furthermore, also in the array type speaker device 20
according to the second embodiment of the present invention, the speaker units 21 having
different vertical and horizontal lengths can be formed into an oval or rectangular shape. As
described above, in the array-type speaker device 20 according to the second embodiment of the
present invention, the longitudinal directions of the plurality of speaker units 21 having different
lengths in the vertical and horizontal directions are the same, and the linear directions are equal
to each other. By arranging at intervals, the directivity in the arrangement direction of the
speaker units can be easily narrowed to the low frequency range without losing the overall
sensitivity. Further, since the longitudinal direction of the speaker unit 21 is arranged in the
vertical direction, the width 20 W of the speaker box 22 can be set thin. As described above,
according to the present invention, the directivity of the arrangement direction of the speaker
units can be easily reduced without deteriorating the overall sensitivity to the high frequency
sound range by reducing the speaker unit interval. It can be narrowed.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view and a cross-sectional view of an
array type speaker apparatus according to a first embodiment of the present invention. FIG. 2 is
an array type according to the first embodiment of the present invention. Block circuit diagram
used in the speaker device [FIG. 3] A plan view and a sectional view of an array type speaker
device according to a second embodiment of the present invention [FIG. 4] A plan view and a
sectional view of a conventional array type speaker device Explanation of symbols] 10 Array-type
speaker devices 11 and 21 according to the first embodiment of the present invention Speaker
unit 11a Horizontal length 11b of speaker unit Vertical length of speaker unit 12, 22 Speaker
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box 15 Attenuator 16 Output amplifier 17 terminals 20 array type speaker apparatus P1 of the
second embodiment of the present invention speaker unit interval P2 array length
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