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JP2012105020

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2012105020
PROBLEM TO BE SOLVED: To expand a listening range in a high range. SOLUTION: A first
speaker unit 3 having a predetermined directivity angle in the horizontal direction, and a speaker
unit disposed on the opposite side in the vertical direction across the first speaker unit and
horizontal from the directivity angle of the first speaker unit A pair of second speaker units 4
having a large directivity angle in the direction are provided, and the distances from the center
P1 of the first speaker unit to the centers P2 and P2 of the second speaker units are the same.
The first speaker unit and the pair of second speaker units are arranged to face in the same
direction. [Selected figure] Figure 5
スピーカーシステム
[0001]
The present invention relates to the technical field of speaker systems. Specifically, a pair of
second speaker units disposed on opposite sides in the vertical direction across the first speaker
unit and having a directivity angle larger than the directivity angle of the first speaker unit is
provided to It relates to the technical field to expand.
[0002]
There is a speaker system provided with a speaker unit that outputs sound in a predetermined
sound range.
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[0003]
In such a speaker system, for example, at least one speaker unit is disposed in a housing, and
audio in a predetermined sound range is output from the speaker unit (see, for example, Patent
Document 1).
[0004]
As a speaker unit, there are a woofer that outputs bass, a mid range that outputs midtone, a
tweeter that outputs treble, and a full range type that outputs a range from bass to treble.
[0005]
Patent 4127156 gazette
[0006]
The speaker unit as described above has directivity in the horizontal direction according to the
sound range of the sound to be output, and the directivity angle becomes smaller and the
listening range becomes narrower as the high sound range becomes, so the listening in the
horizontal direction with respect to the speaker system Depending on the position of the person,
it may be difficult to listen to the voice, especially to listen to the high-pitched voice.
[0007]
Then, this invention speaker system makes it a subject to overcome the above-mentioned
problem and to aim at expansion of the listening range in a high sound range.
[0008]
In order to solve the problems described above, the speaker system is disposed on the first
speaker unit having a predetermined directional angle in the horizontal direction, and on the
opposite side in the vertical direction across the first speaker unit. A pair of second speaker units
having a directivity angle larger in the horizontal direction than the directivity angle of the first
speaker unit, and from the center of the first speaker unit to the center of the pair of second
speaker units The first speaker unit and the pair of second speaker units are arranged to face in
the same direction while the distance is made the same.
[0009]
Therefore, in the speaker system, high frequency sound is output from the pair of second
speaker units in an outer angular range in the horizontal direction of the directivity angle of the
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first speaker unit.
[0010]
In the above speaker system, it is desirable that the aperture of the pair of second speaker units
be smaller than the aperture of the first speaker unit.
[0011]
By making the diameter of the pair of second speaker units smaller than the diameter of the first
speaker unit, the directivity angle of the second speaker unit is surely larger than the directivity
angle of the first speaker unit.
[0012]
In the above speaker system, it is desirable to input an audio signal of substantially the same
frequency band to the first speaker unit and the pair of second speaker units.
[0013]
By inputting an audio signal of substantially the same frequency band to the first speaker unit
and the pair of second speaker units, the fall of the audio signal input to the first speaker unit
and the pair of second speakers It does not cross the rising edge of the audio signal input to the
unit.
[0014]
In the above speaker system, the pair of second speaker units at an angle of 0 ° when the
direction toward the first speaker unit and the pair of second speaker units is an angle of 0 °. It
is desirable that the sum of the sound pressure levels of the first and second speaker units be
50% or less of the sound pressure level of the first speaker unit.
[0015]
By setting the sum of the sound pressure levels of the pair of second speaker units to 50% or less
of the sound pressure level of the first speaker unit at an angle of 0 °, the sound output from
the second speaker unit is the first It is difficult to affect the sound output from the speaker unit.
[0016]
In the above speaker system, it is desirable that the distance from the center of the first speaker
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unit to the center of the second speaker unit be 100 mm or less.
[0017]
When the distance from the center of the first speaker unit to the center of the second speaker
unit is 100 mm or less, the sound output from the first speaker unit and the output from the
second speaker unit in the audio reproduction band are It is difficult to interfere with the voice.
[0018]
The speaker system according to the present invention includes a first speaker unit having a
predetermined directivity angle in the horizontal direction, and the speaker system disposed on
the opposite side in the vertical direction across the first speaker unit and the first speaker unit.
And a pair of second speaker units having a large directional angle in the horizontal direction
than the directional angle, wherein the distance from the center of the first speaker unit to the
center of the pair of second speaker units is equalized. The first speaker unit and the pair of
second speaker units are arranged to face in the same direction.
[0019]
Therefore, the directivity is enhanced, and the listening range in the high range can be expanded.
[0020]
According to the second aspect of the present invention, the aperture of the pair of second
speaker units is smaller than the aperture of the first speaker unit.
[0021]
Therefore, the directivity angle of the second speaker unit is surely larger than the directivity
angle of the first speaker unit, and the expansion of the listening range in the high range can be
realized by a simple configuration.
[0022]
According to the third aspect of the present invention, audio signals of substantially the same
frequency band are input to the first speaker unit and the pair of second speaker units.
[0023]
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Therefore, it is possible to prevent the occurrence of a drop in sound pressure level in a specific
frequency band, and to improve the sound quality in the entire sound output band.
[0024]
In the invention described in claim 4, when the direction in which the first speaker unit and the
pair of second speaker units face is an angle of 0.degree., The pair of the two in the angle of
0.degree. The sum of the sound pressure levels of the second speaker unit is 50% or less of the
sound pressure level of the first speaker unit.
[0025]
Therefore, the directivity angle when the voice is synthesized can be increased without
deteriorating the sound quality of the voice output from the first speaker unit at an angle of 0 °.
[0026]
In the invention described in claim 5, the distance from the center of the first speaker unit to the
center of the second speaker unit is 100 mm or less.
[0027]
Therefore, it is possible to prevent a decrease in sound pressure due to interference between the
sound output from the first speaker unit and the sound output from the second speaker unit.
[0028]
Hereinafter, the best mode for carrying out the speaker system of the present invention will be
described according to the attached drawings.
[0029]
In the following description, the direction in which the speaker unit is directed is referred to as
the front (front direction), and the directions of up, down, front, rear, left, and right are indicated
as an angle of 0 ° in the directivity angle.
The directivity angle is a unique angle range for each speaker unit that can hear voice at a
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constant sound pressure level.
[0030]
In addition, the directions of front and rear, right and left shown below are shown for
convenience of explanation, and the present invention is not limited to these directions and
applied.
[0031]
[Overall Configuration] First, the overall configuration of the speaker system will be described
(see FIG. 1).
[0032]
The speaker system 1 is provided as a woofer, a first speaker unit 3 and second speaker units 4
and 4 provided as tweeters in a housing 2, a third speaker unit 5 provided as a mid range, and A
fourth speaker unit 6, 6 is disposed.
[0033]
The first speaker unit 3, the second speaker units 4, 4, the third speaker unit 5, and the fourth
speaker units 6, 6 all face in the front direction (angle 0 °), and each has a predetermined
horizontal direction. It has a pointing angle.
[0034]
The second speaker units 4 are disposed above and below the first speaker unit 3, and the
directivity angles β and β of the second speaker units 4 in the horizontal direction are the
horizontal direction of the first speaker unit 3. Is made larger than the directivity angle α.
[0035]
The first speaker unit 3 and the second speaker units 4, 4 are, for example, disposed above the
third speaker unit 5 provided as a mid range, and a fourth speaker unit 6 provided as a woofer, 6
is disposed, for example, below the third speaker unit.
[0036]
The diameter of the second speaker unit 4 is smaller than the diameter of the first speaker unit 3,
and the diameter of the diaphragm of the second speaker unit 4 is, for example, 19 mm. The
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diameter of the diaphragm of is, for example, 25 mm.
[0037]
The second speaker units 4 and 4 have the same characteristics regarding the sound to be
output, and the second speaker units 4 and 4 are configured to receive an audio signal of the
same frequency band.
[0038]
In the speaker system 1, the reproduction band of sound is, for example, up to 20 KHz.
[0039]
[Directivity of First Speaker Unit and Second Speaker Unit] Next, the directivity of the first
speaker unit 3 and the second speaker units 4 and 4 will be described (see FIGS. 2 to 5).
[0040]
FIG. 2 shows that the first speaker unit 3 and the second speaker unit 3 and the second speaker
unit 3 are attached to the diaphragm 3a of the first speaker unit 3 and the diaphragms 4a and 4a
of the second speaker units 4 and 4 attached to the infinite baffle. FIG. 16 is a graph showing the
directivity of the speaker units 4 of FIG.
An angle (directional angle) in the horizontal direction in the circumferential direction is shown
and 0 ° is an angle in the front direction (front). For example, 30 ° is 30 ° to the left from the
front, and 330 ° is 30 ° to the right from the front Show.
The radial direction indicates the sound pressure level.
In FIG. 2, it is assumed that the sound of the same sound pressure level is output from the first
speaker unit 3 and the second speaker units 4 and 4 at an angle of 0 °, the first speaker unit 3
and the second speaker unit The sound pressure level with respect to the directivity angle of 4
and 4 is shown.
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[0041]
As shown in FIG. 2, the second speaker units 4, 4 have a larger directional angle than the first
speaker unit 3, and the first speaker unit 3 is in front of the second speaker units 4, 4 (0 ° It can
be seen that the sound pressure level decreases as the angle increases in the horizontal direction.
[0042]
FIGS. 3 to 5 are graphs showing sound pressure levels with respect to frequency, showing sound
pressure levels with respect to frequency at an angle of 0 ° (front), at an angle of 30 ° and at
an angle of 60 °.
FIG. 3 shows the sound pressure level of the sound output from the first speaker unit 3, FIG. 4
shows the sound pressure level of the sound output from the second speaker unit 4, and FIG. 5
shows the first sound pressure level. It shows the sound pressure level when the sound output
from the speaker unit 3 and the second speaker units 4 is synthesized.
The horizontal axis is frequency, and the vertical axis is sound pressure level.
[0043]
In the first speaker unit 3, as shown in FIG. 3, the decrease in sound pressure at around 20 KHz
at an angle of 30 ° is remarkable, but the decrease in sound pressure at several tens of KHz at
an angle of 60 ° is remarkable. When the speaker unit 3 and the second speaker units 4 are
combined, it is understood that the above-described reduction in sound pressure level at 30 °
and 60 ° in the first speaker unit 3 is improved.
By arranging the second speaker units 4, 4 above and below the first speaker unit 3 in this
manner, the directivity becomes high, and the listening range in the high frequency range can be
expanded.
[0044]
In the speaker system 1, the aperture of the second speaker units 4 is smaller than the aperture
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of the first speaker unit 3.
[0045]
Therefore, the directivity angle of the second speaker units 4 is surely larger than the directivity
angle of the first speaker unit 3, and the expansion of the listening range in the high tone range
can be realized with a simple configuration.
[0046]
Furthermore, as the configuration for realizing the expansion of the listening range in the high
tone range, the second speaker units 4, 4 having a smaller diameter than the first speaker unit 3
are arranged above and below the first speaker unit 3. The listening range in the high range can
be expanded without unnecessarily enlarging the speaker system 1.
[0047]
[Audio Signal to be Input to First and Second Speaker Units] Next, an audio signal to be input to
the first and second speaker units 3 and 4 will be described. (Refer FIG.6 and FIG.7).
[0048]
As described above, the speaker system 1 is provided with the first speaker unit 3 and the second
speaker units 4 having different directivity angles, that is, two types of speaker units.
As described above, in the speaker system having two types of speaker units, the audio signals S1
and S2 of the predetermined frequency band are respectively input to the two types of speaker
units, and these audio signals S1 and S2 are connected by a network.
At this time, if the sound pressure levels of the sounds respectively output from the two types of
speaker units are discontinuous, the sound pressure level drops in a specific frequency band in
the synthesized sound signal S12, as shown in FIG. Dip) occurs.
Such a drop in sound pressure level is caused by the cross of the fall of one audio signal S1 and
the rise of the other audio signal S2.
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[0049]
Therefore, in the speaker system 1, the first speaker unit 3 and the second speaker units 4 and 4
are substantially similar to the first speaker unit 3 and the second speaker unit 4 in order to
prevent the generation of the sound pressure level drop in the specific frequency band as
described above Audio signals S3 and S4 of the same frequency band are respectively input (see
FIG. 7).
At this time, the frequency band of the audio signal S4 input to the second speaker unit 4 is
slightly higher than the frequency band of the audio signal S3 input to the first speaker unit 3 It
is desirable to be shifted.
Such a slight shift toward the high frequency side, that is, by shifting by a predetermined value,
the sound output from the second speaker unit 4 is output from the first speaker unit 3 near the
angle 0 ° It becomes difficult to become a noise of the voice to be generated, and it becomes
possible to control a fall of a sound pressure level in a high-pitch range of synthetic voice signal
S34.
[0050]
As described above, by inputting an audio signal of substantially the same frequency band to the
first speaker unit 3 and the second speaker units 4 and 4, as shown in FIG. The sound pressure
level of the sound output from the first speaker unit 3 and the sound output from the second
speaker unit 4 when the audio signals S3 and S4 are input to the second speaker units 4 and 4,
respectively. The network is connected so as to continuously connect the sound pressure levels
of
[0051]
Therefore, the fall of the audio signal S3 and the rise of the audio signal S4 do not cross each
other, and the occurrence of the drop in the sound pressure level in the specific frequency band
is prevented, thereby improving the sound quality in the entire audio output band. be able to.
[0052]
[Relation between Sound Pressure Levels of First Speaker Unit and Second Speaker Unit] Next,
the relationship between sound pressure levels of the first speaker unit 3 and the second speaker
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units 4 and 4 will be described (FIG. 8 and FIG. See Figure 9).
[0053]
In the speaker system 1, the sum of the sound pressure levels of the second speaker units 4 at an
angle of 0 ° is 50% or less of the sound pressure level of the first speaker unit 3.
[0054]
Therefore, when the sound pressure level of the sound output from the first speaker unit 3 is, for
example, 90 db at the angle 0 °, the sum of the sound pressure levels of the sounds output from
the second speaker units 4 and 4 Is, for example, 84 db or less.
[0055]
FIG. 8 shows that the first speaker unit 3 and the second speaker unit 3 and the second speaker
unit 3 have the diaphragm 3a of the first speaker unit 3 and the diaphragms 4a and 4a of the
second speaker units 4 attached to the infinite baffle. FIG. 6 is a graph showing the directivity of
the speaker units 4;
An angle (directional angle) in the horizontal direction in the circumferential direction is shown,
and 0 ° is an angle in the front direction (forward), and a radial direction indicates a sound
pressure level.
[0056]
FIG. 9 is a graph showing the directivity when the sounds output from the first speaker unit 3
and the second speaker units 4 and 4 are synthesized, and when the sounds are synthesized, the
horizontal direction is from the angle 0 ° It can be seen that high sound pressure levels are
maintained even at angles away from the direction.
[0057]
As described above, by setting the sum of the sound pressure levels of the second speaker units 4
at an angle of 0 ° to 50% or less of the sound pressure level of the first speaker unit 3, the
second speaker unit 4, It is difficult for the sound output from 4 to affect the sound output from
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the first speaker unit 3.
Therefore, the directivity angle when the voice is synthesized can be increased without degrading
the sound quality of the voice output from the first speaker unit 3 at the angle 0 °.
[0058]
[Distance Between First Speaker Unit and Second Speaker Unit] Next, the distance between the
first speaker unit 3 and the second speaker units 4 will be described (see FIG. 10).
[0059]
In the speaker system 1, the distances L and L from the center P1 of the first speaker unit 3 to
the centers P2 and P2 of the second speaker units 4 and 4 are the same, for example, 100 mm or
less ing.
The distances L, L are preferably 50 mm or less.
[0060]
Generally, the listener listens to the sound output from the speaker system 1 at a listening point
1 m or more apart.
[0061]
Therefore, for example, when the distances L and L are 50 mm, considering the listening point Q
1 m away from the center P 1 of the first speaker unit 3, the centers P 2 of the second speaker
units 4 from the listening point Q, The distance to P2 is 1.00125 m.
At this time, the difference between the distance from the listening point Q to the center P1 and
the distance from the listening point Q to the center P2 is as small as 1.25 mm, and the first
speaker is in the range up to 20 KHz which is the audio reproduction band of the speaker system
1 It is hard to produce the fall of the sound pressure by interference with the sound outputted
from unit 3 and the sound outputted from the 2nd speaker unit 4 and 4.
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Also, for example, when the distances L and L are 100 mm, the distance from the listening point
Q 1 m away from the center P1 of the first speaker unit 3 to the centers of the second speaker
units 4 is about 1.005 m. Be done.
At this time, the difference between the distance from the listening point Q to the center P1 and
the distance from the listening point Q to the center P2 is as small as about 5 mm, and the first
speaker unit is in the range up to 20 KHz which is the audio reproduction band of the speaker
system 1 It is hard to produce the fall of the sound pressure by interference with the sound
outputted from 3 and the sound outputted from the 2nd speaker unit 4 and 4.
[0062]
The difference between the distance from the listening point Q to the center P1 and the distance
from the listening point Q to the center P2 decreases as the distance from the center P1 of the
first speaker unit 3 to the listening point Q increases. As the distance from the center P1 of the
first speaker unit 3 to the listening point Q increases, the interference of voices is less likely to
occur.
[0063]
Therefore, as described above, by setting the distances L and L from the center P1 of the first
speaker unit 3 to the centers P2 and P2 of the second speaker units 4 and 4 to 100 mm or less,
the deterioration of the sound quality due to interference is reduced. It can be prevented.
Further, by setting the distances L and L to 50 mm or less, the effect of preventing the
deterioration of the sound quality due to the interference can be further enhanced.
[0064]
[Others] In the above, as an example in which a pair of speaker units having a large directivity
angle is disposed above and below the speaker unit having a smaller directivity angle, the first
speaker unit 3 and the second speaker unit 3 used as a tweeter Speaker units 4, 4 are shown.
[0065]
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However, the example of three speaker units configured in this way is not limited to the tweeter,
and can be applied to any of the mid range, the woofer and the full range.
[0066]
The specific shapes and structures of the respective parts shown in the above-described best
mode are merely merely examples of the implementation of the present invention, and the
technical scope of the present invention is limited thereby. It should not be interpreted in any
way.
[0067]
The embodiment of the present invention is shown with FIGS. 2 to 10, and this figure is a
perspective view of a speaker system.
It is a graph which shows the directivity of a 1st speaker unit and a 2nd speaker unit.
The sound pressure level with respect to frequency is shown together with FIG. 4 and FIG. 5, and
this figure is a graph showing the sound pressure level of the sound output from the first speaker
unit.
It is a graph which shows the sound pressure level of the sound outputted from the 2nd speaker
unit.
It is a graph which shows the sound pressure level when the audio | voice output from a 1st
speaker unit and a 2nd speaker unit is synthesize | combined.
It is a schematic diagram which shows the example in case the sound pressure level of the audio
| voice respectively output from two types of speaker units is discontinuous.
It is a schematic diagram which shows the example in which the sound pressure level of the
audio | voice respectively output from two types of speaker units was continued.
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Indicates the directivity of the first speaker unit and the second speaker unit when the sum of the
sound pressure levels of the second speaker unit is made 50% or less of the sound pressure level
of the first speaker unit at an angle of 0 ° FIG.
It is a graph which shows directivity when the audio | voice output from the 1st speaker unit and
the 2nd speaker unit was synthesize | combined.
It is a figure for demonstrating the distance of a 1st speaker unit and a 2nd speaker unit.
[0068]
1 ... speaker system, 3 ... 1st speaker unit, 4 ... 2nd speaker unit
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