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JP2010199802

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2010199802
[PROBLEMS] To suppress the sound pressure at a specific place and to suppress the movement
of a sound image by utilizing mutual interference of sounds emitted from a plurality of speakers
as small as possible. A stereo speaker system includes a left speaker 22, a right speaker 23, a
control speaker 24 disposed between them, a left sound source transmitting unit 40 for
transmitting a left sound signal sL, and a right sound signal sR. The sound emitted from the left
speaker, the right speaker and the control speaker is adjusted based on the right sound source
transmitting unit 41 to transmit, the left sound signal and the right sound signal, and the left
speaker, the right speaker and the control speaker And a sound reduction adjustment unit 42
that reduces the sound emitted from the unit by mutual interference. The control speaker has
directivity toward the central listening position, and the left speaker and the right speaker have
directivity toward the central listening position rather than the direction parallel to the direction
of the control speaker. [Selected figure] Figure 1
ステレオスピーカシステム
[0001]
The present invention relates to stereo speaker systems, and more particularly to the
arrangement of multiple speakers.
[0002]
There is known a technique for suppressing the sound pressure at a specific place by using a
plurality of speakers and utilizing mutual interference of sounds emitted from the speakers
(Patent Document 1).
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1
[0003]
JP 2007-121439 A
[0004]
The principle of suppressing the sound pressure at a specific place using a plurality of speakers
and utilizing mutual interference of sounds emitted from these speakers will be described with
reference to FIG.
Here, in order to make the explanation easy to understand, it is assumed to be monaural, not
stereo.
[0005]
A voice input signal S is sent to a main sound source speaker (main sound source) 11 through a
main sound source control filter 10, and a main sound is emitted from the main sound source 11.
This tonic sound is best heard at the central listening position (audible area) 17 in front of the
main sound source 11.
On the other hand, the first control sound source speaker (first control sound source (the first
control sound source) so that the sound heard at the specific sound pressure reduction position
(sound reduction position, sound reduction area) 12 deviated from the front of the main sound
source 11 becomes small. ) And the second control sound source speaker (second control sound
source) 16 are disposed, and the voice input signal S passes through the first control filter 13
and the second control filter 14 respectively, and the first control sound source 15 and the
second control The sound is input to the sound source 16.
[0006]
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2
At the central listening position 17 in front of the main sound source 11, the sound from the first
control sound source 15 and the sound from the second control sound source 16 interfere with
each other to cancel each other out, and the sound emitted from the main sound source 11
decreases. Reach without sounding. Further, at the sound pressure lowering position 12, the
sounds of the main sound source 11, the first control sound source 15, and the second control
sound source 16 interfere with each other to cancel each other, and the total sound pressure by
these three speakers is suppressed small.
[0007]
That is, the sound pressure suppression technology using the mutual interference of the sound
maintains the sound pressure at the central listening position 17 and minimizes the acoustic
energy transmitted to the side surface to make the wall (virtual wall surface) 18 invisible on the
side surface. The sound pressure reduction position 12 is created after the virtual wall surface
18.
[0008]
A control filter for creating a virtual wall on the side surface can be derived from the following
equation while maintaining the sound pressure at the front center listening position.
If N optimization points are arranged at the central listening position for sound pressure
maintenance and M optimizations are arranged in the side virtual wall surface, the sound from
the first control sound source 15 and the second at the central listening position 17 in the front
are The sound pressure squared sum (acoustic energy) from the control sound source 16 of the
following is minimized, and the sound pressure squared sum (acoustic energy) from the main
sound source 11, the first control sound source 15, and the second control sound source 16 is
The control filter is derived by minimizing. A plurality of N and M can be installed. In
mathematical expression, the i-th sound pressure Pi in the central listening position of sound
pressure maintenance is as follows.
[0009]
Here, the radiation impedances FS1j and FS2j of the first and second control sound sources
consisting of complex amplitudes qS1 and qS2 are
[0010]
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3
LS1 j: distance from the first control sound source to the j-th in the audible area LS2 j: distance
from the second control sound source to the j-th in the audible area Sound from the first control
sound source 15 and from the second control sound source 16 Let J be the arrival sound
pressure square sum (acoustic energy) and minimize
[0011]
However, "<*>" represents a conjugate complex number.
[0012]
The relationship between qS1 and qS2 is determined from equation (5) considering that qS2 is
the complex amplitude of the following equation
[0013]
Therefore, the second control filter 14 is obtained.
[0014]
And, assuming that the j-th sound pressure is Qj in the virtual wall surface,
[0015]
Substituting equation (6)
[0016]
Here, the radiation impedances Zp, ZS1, ZS2 of the control sound source and the main sound
source consisting of the complex amplitudes qS1, qS2 are
[0017]
LP: distance from the main sound source to the i-th evaluation point in the virtual wall LS1:
distance from the first control sound source to the i-th evaluation point in the virtual wall LS2:
evaluation of the i-th in the virtual wall from the second control sound source Distance to point
Similarly, consider minimizing acoustic energy.
[0018]
First, equation (8) is replaced as follows to facilitate calculation.
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4
[0019]
ここで、
[0020]
Then, when the said acoustic energy is set to U, it becomes the following.
[0021]
Therefore, the second control filter is obtained.
[0022]
Incidentally, the control effect at an arbitrary space point X is as follows.
[0023]
Sound pressure before control is
[0024]
The sound pressure after control is ... (16) Here, equation (11) holds.
[0025]
Therefore, the sound pressure level reduction amount (dB) before and after control at the
arbitrary point X is ... (17) By the way, when applying the sound pressure suppression technology
using the mutual interference of the above sound to a stereo speaker system, There are the
following issues.
[0026]
For example, as shown in FIG. 15, for the left main sound source 11L, the left first control sound
source 15L disposed on the right of the left main sound source 11L and the left second control
sound source 16L further disposed on the right thereof are used. Consider the system
configuration that was
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5
The illustration and description of the right side sound source is omitted.
The sound reduction position 12 is on the left side of the left main sound source 11L.
At this time, since the left first control sound source 15L and the left second control sound
source 16L are farther from the sound reduction position 12 than the left main sound source
11L with respect to the sound reduction position 12, the left first control sound source 15L and
The amplitude of the sound emitted from the left second control sound source 16L becomes
equal to or larger than that of the left main sound source 11L. As a result, at the time of control,
the sound image sounds like movement.
[0027]
FIG. 16 shows a configuration in the case where the configuration of FIG. 15 is directly used as a
stereo speaker system.
In this case, the left main sound source 11L and the right main sound source 11R are
symmetrical with respect to the central listening position 17, and the left first control sound
source 15L and the right first control sound source 15R are in symmetrical positions. 16L and
the right second control sound source 16R are in symmetrical positions.
[0028]
As shown in FIG. 16, if the control sound sources 15L, 15R, 16L, 16R are arranged near the
respective main sound sources 11L, 11R, even if the main sound sources 11L, 11R are arranged
on the far side, the main sound sources 11L, 11R and Since the distance between the control
sound sources 15L, 15R, 16L, 16R is small, the amplitudes of the control sound sources 15L,
15R, 16L, 16R are not as large as those of the main sound sources 11L, 11R, and the sound
image movement feeling is not so great. It disappears.
However, in order to obtain effects with stereo sound sources in this configuration, a total of six
of the main sound sources 11L, 11R and the control sound sources 15L, 15R, 16L, 16R are
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6
required.
Thus, the number of speakers and the sense of stereo localization (sound image) have a trade-off
relationship.
Therefore, it becomes an issue to maintain the sense of sound image localization without
increasing the number of speakers (sound sources).
[0029]
In FIG. 17 and FIG. 18, nine evaluation points 20 are actually provided on the virtual wall surface
18 to minimize the acoustic energy, and the left first control sound source 15 L and the left
second control sound source 16 L for the main sound source 11 L The example of arrangement
composition in calculating the amplitude of is shown.
Here, FIG. 17 shows an xy coordinate plane, and FIG. 18 shows an xz coordinate plane.
As shown in this figure, the left main sound source 11L, the left first control sound source 15L,
and the left second control sound source 16L are arranged on the y axis, and their y coordinates
(unit: m) are -0.35, -0.05, +0.25.
Further, the virtual wall surface 18 is perpendicular to the y axis when the y coordinate is −2.5,
and as the evaluation point 20, as shown in FIGS. 17 and 18, 0.5 ≦ x ≦ 2, 0 ≦ z ≦ We shall
take 9 points in a square of 1.5 range.
[0030]
The amplitude calculation result of the first control sound source 15L and the second control
sound source 16L when the amplitude of the main sound source 11L at this time is 1 is shown in
FIG.
[0031]
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7
In this figure, the amplitudes of the first control sound source 15L and the second control sound
source 16L are seen to overlap each other.
From this figure, it can be seen that the amplitude of the control sound source is equal to or
greater than that of the main sound source in a certain frequency band.
In particular, the movement of the sense of localization of the sound image is difficult to perceive,
as with a normal woofer, because the wavelength is long even if the bass below 200 Hz is
increasing.
However, an increase in the midrange near 1 kHz is not perceived as an integral sound source
because the distance between the control sound source and the main sound source is also longer
than the wavelength in addition to the sensitive band on hearing.
Therefore, in addition to the main sound source, the control sound source is also heard, and as a
result, the feeling of sound image localization is deteriorated.
[0032]
The present invention has been made in view of the above circumstances, and in the case of
suppressing the sound pressure at a specific place by using a plurality of speakers and utilizing
mutual interference of sounds emitted from these speakers, An object of the present invention is
to provide a stereo speaker system in which the movement of a sound image is suppressed by
using as few speakers as possible.
[0033]
In order to achieve the above object, a stereo speaker system according to the present invention
comprises a left speaker disposed to the left of a central listening position, a right speaker
disposed to the right of the central listening position, the left speaker and the right speaker A
control sound source disposed between the two, a left sound source transmitting unit that
outputs a left sound signal that is a main sound signal of the left speaker, and a right sound
source transmitting unit that outputs a right sound signal that is a main sound signal of the right
speaker; The sound emitted from each of the left speaker, the right speaker and the control
speaker is adjusted based on the left sound signal and the right sound signal, and the left side at
a predetermined position to the left of the left speaker or to the right of the right speaker. A
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speaker, a right speaker, and a sound reduction adjustment unit for reducing the sound emitted
from the control speaker by mutual interference, and the control speaker It has directivity toward
the central listening position, and the left and right speakers are configured to have directivity in
the direction closer to the central listening position than in the direction parallel to the direction
of the control speaker, It is characterized by
[0034]
According to the present invention, it is possible to obtain the effect of suppressing the sound
pressure at a specific place without degrading the feeling of sound image localization using a
small number of speakers.
[0035]
It is a plane sectional view showing typically the 1st embodiment of the speaker system
concerning the present invention.
It is a plane sectional view which shows typically the left side speaker of FIG. 1, and its sound
propagation path.
It is a schematic perspective view which shows the left side speaker of FIG. 1, and its periphery
structure.
It is a plane sectional view showing typically the testing device which investigates the
characteristic of a 1st embodiment of the speaker system concerning the present invention.
It is a graph which shows the actual value of the frequency amplitude characteristic input into
the speaker of the main sound source and control sound source in the test device of FIG.
It is a graph which shows the actual value of the frequency amplitude characteristic input when
the direction of the speaker of a main sound source and a 2nd control sound source is made
parallel to the direction of the speaker of a 1st control sound source in the test device of FIG.
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9
In the test device of FIG. 4, it is a graph which compares and shows the actual value of the
frequency amplitude characteristic in the front hearing point in the case where control sound
source is used and not used.
In the test device of FIG. 4, it is a graph which compares and shows the actual value of the
frequency amplitude characteristic in an inaudible point in the case where control sound source
is used, and not using it. It is a plane sectional view showing typically the 2nd embodiment of the
speaker system concerning the present invention. It is a plane sectional view which shows
typically the left side speaker of FIG. 9, and its surrounding structure. It is a schematic
perspective view which shows the left side speaker of FIG. 9, and its periphery structure. It is a
plane sectional view showing typically the 3rd embodiment of the speaker system concerning the
present invention. It is a plane sectional view showing typically the 4th embodiment of the
speaker system concerning the present invention. It is a typical explanatory view showing the
monaural speaker system for explaining the principle of the speaker system concerning the
present invention. It is a schematic plan view which shows the speaker arrangement | positioning
in the monaural speaker system for demonstrating the subject of the speaker system which
concerns on this invention. It is a schematic plan view which shows the speaker arrangement |
positioning in the stereo speaker system for demonstrating the subject of the speaker system
which concerns on this invention. It is a top view shown by the xy coordinate plane which shows
arrangement composition, such as a speaker in performing calculation for explaining a subject of
a speaker system concerning the present invention. It is an elevation shown by the xz coordinate
plane which shows the arrangement configuration of a speaker etc. in performing the calculation
for demonstrating the subject of the speaker system which concerns on this invention. It is a
frequency amplitude characteristic graph which shows the calculation result for explaining the
subject of the speaker system concerning the present invention.
[0036]
Hereinafter, embodiments of a stereo speaker system according to the present invention will be
described with reference to the drawings. Here, parts that are the same as or similar to each
other are given the same reference numerals, and duplicate explanations are omitted.
[0037]
First Embodiment FIG. 1 is a plan sectional view schematically showing a first embodiment of a
speaker system according to the present invention, and FIG. 2 schematically shows the left
speaker of FIG. 1 and its sound propagation path. It is a plane sectional view showing, and
Drawing 3 is a typical perspective view showing the left-hand side speaker of Drawing 1, and its
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10
circumference structure.
[0038]
The left speaker 22 is disposed on the left side in the speaker cover 21 which spreads to the left
and right, the right speaker 23 is disposed on the right side, and the control speaker 24 is
disposed at the center.
The left duct 25, the right duct 26, and the control speaker duct 27 are disposed in the speaker
cover 21 so as to cover the side surface and the front surface of each of the speakers 22, 23, 24.
Duct openings 28, 30, 29 are formed in front of each of the ducts 25, 26, 27.
[0039]
The left speaker 22 and the left duct 25 are inclined toward the central listening position 17.
Similarly, the right speaker 23 and the right duct 26 are also inclined toward the central listening
position 17. In addition, a left external guide 31 is provided which covers and connects between
the front end of the side surface of the left duct 25 and the front surface of the speaker cover 21.
Similarly, a right external guide 33 is provided covering and connecting between the front end of
the side surface of the right duct 26 and the front surface of the speaker cover 21. The portions
of the front surface of the speaker cover 21 to which the left outer guide 31 and the right outer
guide 33 are attached are hollowed out, and cover openings 32 and 35 are formed in the front of
the left outer guide 31 and the right outer guide 33, respectively.
[0040]
As a modification, the front surface portions of the left external guide 31 and the right external
guide 33 may be integrally formed with the front surface of the speaker cover 21, and the cover
openings 32 and 35 may be formed in the front surface of the speaker cover 21.
[0041]
The duct opening 28 of the left duct 25 and the cover opening 32 of the left outer guide 31 are
both circular, for example, and their centers are offset such that the center of the cover opening
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11
32 of the left outer guide 31 is closer to the center Are arranged.
The same applies to the duct opening 30 of the right duct 26 and the cover opening 35 of the
right external guide 33.
[0042]
The configuration and arrangement of the right speaker 23, the right duct 26 and the right
external guide 33 are symmetrical to the left speaker 22, the left duct 25 and the left external
guide 31.
[0043]
The control loudspeaker 24 and the control loudspeaker duct 27 are arranged towards the front
center listening position 17, ie vertically towards the front of the loudspeaker cover 21.
[0044]
The stereo speaker system comprises a left sound source transmitter 40 for transmitting a left
sound signal sL which is a main sound signal of the left speaker 22, and a right sound source
transmitter 41 for transmitting a right sound signal sR which is a main sound signal for the right
speaker 23. Have.
The stereo speaker system further includes a sound reduction adjustment unit that adjusts an
electrical signal corresponding to a sound to be emitted by the left speaker 22, the right speaker
23, and the control speaker 24 based on the left sound signal sL and the right sound signal sR.
Having 42.
[0045]
The sound reduction adjustment unit 42 adjusts a signal of sound emitted by the control speaker
24 based on the left sound signal sL, and a signal of sound emitted by the control speaker 24
based on the right sound signal sR. And a control speaker signal addition unit 46 for adding the
output signal of the first left adjustment unit 44 and the output signal of the first right
adjustment unit 45.
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The sound reduction adjustment unit 42 further adjusts the right second adjustment unit 47 that
adjusts the sound signal output from the left speaker 22 based on the right sound signal sR, and
the left sound signal sL and the output signal of the right second adjustment unit 47 And the
second left adjusting unit 49 that adjusts the sound signal output from the right speaker 23
based on the left sound signal sL, and the right sound signal sR and the output of the second
adjusting unit 49 for the left. And a right signal addition unit 50 for adding the signal and the
signal.
[0046]
In the above configuration, the sound pressure at the virtual wall surface 18 on the left side of
the left speaker 22 is suppressed low, for example, by mutual interference of sounds emitted
from the left speaker 22, the right speaker 23 and the control speaker 24. The left sound signal
sL from the left sound source transmitter 40 can be heard from the left speaker 22, and the right
sound signal sR from the right sound source transmitter 41 can be heard from the right speaker
23.
[0047]
Moreover, at this time, the sound emitted from the left speaker 22 is at the center listening
position due to the orientation of the left speaker 22 and the left duct 25 and the positional
relationship between the duct opening 28 of the left duct 25 and the cover opening 32 of the left
external guide 31. It has directivity directed to 17.
[0048]
For this reason, in this embodiment, as compared with the prior art shown in FIG. 14 to FIG. 18,
each speaker is directed parallel to the front and produces a sound of the same size, the left
speaker 22 The sound emitted is loud at the central listening position 17 and small at the virtual
wall 18.
Conversely, the sound emitted from the right side speaker 23 can be heard louder on the virtual
wall surface 18 as compared to the case where the speakers are directed in parallel toward the
front as in the prior art shown in FIGS.
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Therefore, when adjustment is made so as to obtain the sound reduction effect on the virtual wall
surface 18, the sound emitted from the left speaker 22 is larger and the sound emitted from the
right speaker 23 is smaller in the case of the present embodiment.
[0049]
Therefore, it is possible to suppress the deterioration of the sound image localization feeling that
occurs to obtain the sound reduction effect.
[0050]
Although the case where the virtual wall 18 is on the left of the left speaker 22 has been
described above, the same applies to the case where the virtual wall 18 is on the right of the
right speaker 23 except that the left and right are reversed.
[0051]
As described above, according to the present embodiment, with the stereo speaker system using
a small number (three) of speakers, the sound pressure at the sound pressure drop position is
suppressed, and the deterioration of the sound image localization feeling is suppressed. Can.
[0052]
Here, the results of the test for confirming the effect of the first embodiment of the speaker
system according to the present invention will be described using FIGS. 4 to 8.
FIG. 4 is a plan sectional view schematically showing the test apparatus.
FIG. 5 is a graph showing measured values of frequency amplitude characteristics input to the
speaker 22 of the main sound source (left sound source) and the speakers 24 and 23 of the
control sound source in the test apparatus of FIG.
FIG. 6 shows the frequency input when the direction of the speakers 23 of the main sound
source and the second control sound source is parallel to the direction of the speaker 24 of the
first control sound source in the test apparatus of FIG. It is a graph which shows the measured
value of an amplitude characteristic. FIG. 7 is a graph showing a comparison of measured values
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14
of frequency amplitude characteristics at front hearing points in the case of using the control
sound source and in the case of not using the control sound source in the test apparatus of FIG.
4. FIG. 8 is a graph showing a comparison of measured values of frequency amplitude
characteristics at inaudible points in the case of using the control sound source and in the case of
not using the control sound source in the test apparatus of FIG. 4.
[0053]
As shown in FIG. 4, in this test apparatus, only the left first adjustment unit 44 and the left
second adjustment unit 49 among the components of the sound reduction adjustment unit 42
shown in FIG. ing. The left speaker 22 is driven based on the left sound signal sL from the left
sound source transmitting unit 40, and the control speaker 24 is driven by the signal adjusted by
the left first adjusting unit 44, and the left second adjusting unit 49 The right speaker 23 is
driven by the adjusted signal.
[0054]
In the configuration shown in FIG. 4, the control speaker 24 functions as a first control speaker,
and the right speaker 23 functions as a second control speaker.
[0055]
In FIG. 4, the speaker cover 21, the left external guide 31 and the right external guide 33 are not
shown.
[0056]
As described above, the left speaker 22 and the right speaker 23 are disposed to be inclined so
as to point inward.
The space transfer characteristic from the left speaker 22 as the main sound source to the virtual
wall surface 18 is attenuated, and made almost the same as the attenuation rate to the virtual
wall 18 of the right speaker 23 and the control speaker 24 as control sound sources far away.
This can suppress an increase in the amplitude of the control speaker.
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15
[0057]
The measured value of the frequency amplitude characteristic input to the control speaker at this
time is as shown in FIG. On the other hand, FIG. 6 shows measured values of frequency amplitude
characteristics when the right speaker (second control speaker) 23 is disposed without being
inclined similarly to the central control speaker (first control speaker) 24. It can be seen in FIG. 5
that the volume around 900 Hz is suppressed as compared to FIG. The reason for the difference
between the result of the numerical calculation shown in FIG. 19 and the increasing frequency is
that the distance from the main sound source to the control sound source is 60 cm in the
calculation, and the frequency is about 80 cm in the experiment. Is shifted to the high region.
[0058]
At this time, the control effect of 1.5 m of fronts by the difference in the presence or absence of
control is shown in FIG. There is no change in sound pressure depending on the presence or
absence of control, and it can be seen that the sound pressure can be maintained as intended. On
the other hand, the average sound pressure level of the nine evaluation points on the side is
between 200 Hz and the upper limit of 1 kHz, as shown in FIG. It can be seen that the sound
pressure is decreasing.
[0059]
As a result, it was confirmed by experiments that the control effect can be maintained without
increasing the amplitude of the control sound source by devising the shape around the main
sound source speaker.
[0060]
Second Embodiment FIG. 9 is a plan sectional view schematically showing a second embodiment
of the speaker system according to the present invention, and FIG. 10 schematically shows the
left speaker of FIG. 9 and its surrounding structure. FIG. 11 is a schematic cross-sectional view,
and FIG. 11 is a schematic perspective view showing the left speaker of FIG. 9 and its
surrounding structure.
[0061]
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16
In this embodiment, there is nothing equivalent to the left duct 25, the right duct 26 and the
control speaker duct 27 in the first embodiment.
The left speaker 22 and the left external guide 31 are directly joined, and the right speaker 23
and the right external guide 33 are directly joined.
[0062]
The left speaker 22 is disposed to be inclined toward the central listening position 17.
Similarly, the right speaker 23 is also inclined to be directed to the central listening position 17.
In addition, a left external guide 31 is provided which covers and connects between the side
surface of the left speaker 22 and the front surface of the speaker cover 21. Similarly, a right
external guide 33 which covers and connects between the side surface of the right speaker 23
and the front surface of the speaker cover 21 is disposed. The portions of the front surface of the
speaker cover 21 to which the left outer guide 31 and the right outer guide 33 are attached are
hollowed out, and cover openings 32 and 35 are formed in the front of the left outer guide 31
and the right outer guide 33, respectively.
[0063]
The cover opening 32 of the left outer guide 31 and the cover opening 35 of the right outer
guide 33 are, for example, circular, and their center positions are shifted so as to be closer to the
center than the centers of the speakers 22 and 23, respectively. It is arranged.
[0064]
The control speaker 24 is disposed adjacent to a cover opening 60 formed at the center of the
front surface of the speaker cover 21.
The other configuration is the same as that of the first embodiment.
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17
[0065]
According to this embodiment, even when there is no speaker duct, the same effect as that of the
first embodiment can be obtained.
[0066]
Third Embodiment FIG. 12 is a plan sectional view schematically showing a third embodiment of
the speaker system according to the present invention.
[0067]
In this embodiment, there is nothing equivalent to the left external guide 31 and the right
external guide 33 in the first embodiment.
A front part of the left duct 25 and the right duct 26 protrudes forward from the front surface of
the speaker cover 21.
The other configuration is the same as that of the first embodiment.
[0068]
According to this embodiment, even in the absence of the left outer guide and the right outer
guide, the same effect as that of the first embodiment can be obtained.
[0069]
Fourth Embodiment FIG. 13 is a plan sectional view schematically showing a fourth embodiment
of the speaker system according to the present invention.
[0070]
In this embodiment, there is nothing equivalent to the left external guide 31 and the right
external guide 33 in the first embodiment.
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18
Moreover, the left speaker 22, the right speaker 23, the control speaker 24, the left duct 25, the
right duct 26 and the control speaker duct 27 are directed parallel to the front, ie, vertically to
the front of the speaker cover 21.
A left inner guide 62 and a right inner guide 63 are attached to the inside of the left duct 25 and
the right duct 26, respectively. These internal guides 62 and 63 are configured to provide
directivity such that sounds emitted from the left speaker 22 and the right speaker 23 are
directed inward. The inner guides 62, 63 are, for example, diagonally inclined plates as shown in
FIG. The other configuration is the same as that of the first embodiment.
[0071]
According to this embodiment, the structure of the speaker cover 21 and the speakers 22, 23, 24
and the speaker ducts 25, 26, 27 in the inside can be arranged in parallel as in the prior art. The
same effect as that of the first embodiment can be obtained.
[0072]
Other Embodiments The embodiments described above are merely examples, and the present
invention is not limited to these.
For example, in the first, third and fourth embodiments (FIG. 1, FIG. 12, FIG. 13), the control
speaker duct 27 is eliminated and the control speaker 24 is the same as the second embodiment
(FIG. 9). The speaker cover 21 may be directly attached. Conversely, in the second embodiment,
the control speaker duct 27 may be attached as in the first, third, and fourth embodiments.
[0073]
17 center listening position (audible area) 18 invisible wall (virtual wall) 20 evaluation point 21
speaker cover 22 left speaker 23 right speaker (second control speaker) 24 control speaker (first
control speaker) 25 left Duct 26 Right duct 27 Control speaker duct 28, 29 and 30 Duct opening
31 Left external guide 32 Cover opening 33 Right external guide 35 Cover opening 40 Left
sound source transmitter 41 Right sound source transmitter 42 Sound reduction adjuster 44 Left
first adjuster 45 first adjustment unit for right 46 signal addition unit for control speaker 47
second adjustment unit for right 48 signal addition unit for left 49 second adjustment unit for
left 50 signal addition unit for right 60 cover opening 62 left internal guide 63 right internal
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guide
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