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JPH0993685

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH0993685
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus used in combination with a stereo apparatus, a television set or the like and a
method of installing the same.
[0002]
2. Description of the Related Art In recent years, so-called AV devices that are used alone or in
combination with visual devices have become extremely popular, and a speaker device is
incorporated in each. The above-described conventional speaker apparatus will be described
below with reference to the drawings. FIG. 7 is a plan view schematically showing the installation
of the conventional speaker apparatus in a room. In the room 61 having the wall 62 in FIG. 7, the
speaker device 63 for the left channel and the speaker device 64 for the right channel of the
conventional example are installed.
[0003]
SUMMARY OF THE INVENTION Most of the speaker devices 63 and 64 of the prior art as
described above have acoustic characteristics close to omnidirectional in the middle to low
frequency (for example, 300 Hz). Therefore, as shown as a model in FIG. 7, there is a problem
that the sound image localization is deviated at a position where the distance from the left and
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right speakers 63 and 64 is different from the listening position. If this point is described in more
detail using FIG. 7 from the sound center SL point of the left speaker 63 and the sound center SR
point of the right speaker 64, the middle low band signal reaches the listening position MC at the
same level think about. In this case, the sound pressure PE generated at the point MC is PL from
the left speaker 63 and PR from the right speaker 64, and the vector arrows PL, PR and these
two signals are synthesized as shown in FIG. It can be expressed by the arrow PE of the resulting
vector. Here, the sound image is localized in the direction opposite to the vector PE in the
direction of the vector PF represented by the broken arrow with the same dimension and
localized at a point PC equidistant from the acoustic centers SL and SR of the left and right
speakers. From the same idea as above, the sound pressure vector at the point MR slightly shifted
to the right from the ideal listening position is a combination of the sound pressure vectors PL1
and PR1 because the distances from the left and right speakers 63 and 64 are different. The
vector PE1 has a defect that the sound image localization direction is the PF1 direction and is
localized at the point PC1 shifted to the right from the point PC that should be originally
localized. In this figure, circles (A) and (B) indicate the polar coordinate directivity patterns of the
speaker devices 63 and 64 as a model, and in this figure, the non-directivity at the middle low
frequency is represented.
[0004]
SUMMARY OF THE INVENTION The present invention is intended to improve the problems of
the above-described conventional example, and it is an object of the present invention to provide
a speaker device and an installation method thereof in which sound image localization does not
shift due to listening positions.
[0005]
SUMMARY OF THE INVENTION In order to achieve the above object, a speaker device according
to the present invention comprises a speaker having no directivity in the horizontal plane in the
middle bass range, and dipole directivity in the horizontal plane in the middle bass zone. And a
speaker having an H.sub.2 O.sub.2 combination, with their acoustic centers matched.
[0006]
In addition, in order to achieve the above object, the method of installing the speaker device
according to the present invention installs uni-directional speaker devices on both sides of the
front of the room and places the maximum directivity gain direction of the right speaker device
on the left side from the ideal listening position. The maximum directivity gain direction of the
left speaker device is set to the listener position on the right side of the ideal listening position.
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[0007]
In the present invention, by installing the above-mentioned speaker apparatus by the abovementioned installation method, the sound image localization at the listening position acts so as to
reduce the difference from that at the ideal listening position, and Since the emission of midrange to the rear is small, the influence of the reflection of sound on the back and side walls of
the speaker device is small, and the change in sound quality depending on the installation place
is reduced.
[0008]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the
loudspeaker system of the present invention will be described in detail with reference to FIGS.
FIG. 1 schematically shows a speaker apparatus according to a first embodiment of the present
invention. FIG. 1 (a) is a partially transparent top view, and FIG. 1 (b) is a side sectional view.
In FIG. 1, 1 is a speaker for exclusive use in bass (hereinafter referred to as woofer), 2 is a
speaker driver only for medium sound (hereinafter referred to as mid range driver A), and is
combined with horn A constituted by horn walls 4 and 5 to be horn speaker A. And mounted on
the cabinet 3.
Another mid-range speaker (hereinafter referred to as mid-range driver B) 6 is mounted on an
exponential horn 7 having a symmetrical cross-sectional area change before and after the
diaphragm to constitute a horn speaker B. The part and the wall of the horn 7 are constructed as
close as possible or in one piece.
The cabinet 3 is attached with a dedicated high-pitched speaker (hereinafter referred to as a
tweeter) 8 and a demultiplexing circuit 9 for supplying an electric signal according to each band
to each speaker unit.
[0009]
The operation of the loudspeaker apparatus of the present embodiment configured as described
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above will be described below. First, only a low frequency (300 Hz or less in this example) signal
is applied to the woofer 1 by the branching circuit 9. In this band, since the wavelength is longer
than the cabinet size of the speaker device, the sound wave also wraps around the back of the
cabinet due to the diffraction effect and becomes almost omnidirectional. Next, the same signal is
applied to both the horn speaker A and the horn speaker B (in this embodiment, 300 to 2,000
Hz). The polar directivity of the middle low band part of this band is as shown in FIG. In this
figure, the curve 11 represents the directivity pattern from the nondirectional sound source from
the horn speaker A, and the curves 12A and 12b represent the directivity pattern from the horn
speaker B. Here, the output sound pressure of the horn speaker B is a dipole sound source
because the sound before and after the diaphragm is respectively guided to the horn. Therefore,
the phase of the circle 12a at the top of FIG. 2 is in phase with the horn speaker A, and the phase
of the circle 12b at the bottom is antiphase. Here, if the output sound pressure level of horn
speaker A and horn speaker B is adjusted with the attenuator of the branching circuit so that the
amplitude in the direction of the maximum level becomes the same, the synthesized sound
pressure directivity pattern is pattern 13 It becomes uni-directional with a heart-shaped curve.
[0010]
FIG. 3: is a top view which shows typically the installation condition to the room of the speaker
apparatus of a present Example. In the room 21 having the wall 22 in FIG. 3, the left channel
speaker device 23 and the right channel speaker device 24 of the present invention are installed.
The heart-shaped curves (c) and (d) represent the polar coordinate directivity patterns of the
speaker devices 23 and 24, respectively. It is a speaker that I had.
[0011]
The operation of FIG. 3 will be described in more detail. A case will be considered in which
middle-low signals reach the listening position MC from the sound center SL of the left speaker
23 and the sound center point SR of the right speaker 24 at the same level. In this case, the
sound pressure PE generated at the point MC is PL from the left speaker 23 and PR from the
right speaker 24 as shown in FIG. 3 in the vector arrows PL, PR, and these two signals. Can be
represented by the arrow PE of the vector synthesized. Here, the sound image is localized in the
direction opposite to the vector PE in the direction of the vector PF represented by the broken
arrow with the same dimension and localized at a point PC equidistant from the acoustic centers
SL and SR of the left and right speakers. From the same idea as above, the sound pressure vector
PE1 at the point MR slightly shifted to the right from the ideal listening position is different in
distance from the left and right speakers 23 and 24, respectively. However, since the sound
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pressure from the left speaker device 23 has directivity gain as apparent from the directivity
pattern (c), the sound pressure level PL1 at the point MR is obtained from the sound pressure
level PL from the left speaker device 23 at the point MC. It becomes bigger. On the other hand,
the sound pressure level PR1 from the right speaker device 24 at the point MR is smaller than
the sound pressure level PR at the point MC far from the speaker device 24. Therefore, synthetic
sound pressure level PE1 at point MR is PE1 approximately equal to sound pressure level PE at
point MC, and the direction of arrow PF1 of the vector indicating the direction of the sound
image is also substantially equal to point PC which is the sound image position at point MC
become. As described above, according to the present embodiment, it is possible to realize a
speaker device in which the change in the sound image localization due to the listening position
is small, and by arranging the directivity of this speaker device as illustrated, the change in the
sound image localization due to the listening position It is possible to obtain a small speaker
installation method.
[0012]
Next, a second embodiment of the present invention will be described with reference to FIG. FIG.
4 (a) is a top plan view of the speaker apparatus of the second embodiment, and FIG. 4 (b) is a
side view of the speaker apparatus of the second embodiment. In this figure, 31 is a speaker
dedicated to low frequencies (hereinafter referred to as woofer), 32 is a speaker driver dedicated
to medium sound (hereinafter referred to as mid range driver C), and horn speaker C is combined
with horn C constituted by horn walls 34 and 35. It is configured and mounted on the cabinet 33
as shown in FIG. The reference numeral 36 designates another medium sound dedicated speaker
(hereinafter referred to as "mid range driver D"), which is attached to an exponential horn 37
having a symmetrical cross-sectional area change before and after the diaphragm to constitute
the horn speaker D. The horn speaker D is configured such that the opening of the horn 37 faces
the left front and the right rear as viewed from the front with respect to the mounting baffle
surfaces of the woofer 31 and the tweeter 38. This configuration is for the right channel, and for
the left channel, the horn speaker D faces the diagonally front right and diagonally back left
when viewed from the front with respect to the mounting baffle faces of the woofer 31 and the
tweeter 38. Need to configure. The cabinet 33 is provided with a dedicated high-pitched speaker
(hereinafter referred to as a tweeter) 38 and a demultiplexing circuit 39 for supplying an electric
signal corresponding to each band to each speaker unit. This speaker device is different from the
first embodiment in that the pointing direction of the horn speaker D having a dipole function is
obliquely directed to the pointing direction of the woofer 31 and the tweeter 38.
[0013]
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FIG. 5 schematically shows the installation state in the room of the speaker device of this
embodiment. In the room 41 having the wall 42 in FIG. 5, the speaker device 43 for the left
channel and the speaker device 44 for the right channel of the present embodiment are installed.
The heart-shaped curves (e) and (f) show the polar coordinate directivity patterns of the speaker
devices 43 and 44, respectively. Unidirectionality in which the sound pressure level is maximum
at the speaker diagonally forward and the diagonally rear is minimal Is a speaker with. The
operation in FIG. 5 is that the speaker device 43 has the horn speaker D of the speaker device 23
described in FIG. 3 facing diagonally to the right, and the speaker device 44 has the horn speaker
D of the speaker device 24 described in FIG. The operation is completely the same as that of the
first embodiment except that the left diagonally front is different.
[0014]
FIG. 6 shows a speaker apparatus according to a third embodiment of the present invention. FIG.
6 (a) is a partially transparent top view, and FIG. 6 (b) is a side sectional view. In this figure, 51 is
a speaker dedicated to bass, 52 is a cone type mid-range speaker E, and a cabinet 53 is equipped
with a speaker dedicated to high-pitched sound 58 and a branching circuit 59 inside. The
midrange reflection block 54 is made of a highly rigid metal or the like as a material to reflect
the sound of the cone-type mid-range speaker 52 in all directions in the horizontal plane. The
cone-type mid-range speaker F55 and the cone-type mid-range speaker G56 are configured to
reproduce substantially the same frequency band as the other cone-type mid-range speaker E52
described above, and are attached to the middle sound cabinet 57.
[0015]
The operation of this speaker device will be described below. First, only a low frequency (300 Hz
or less in this example) signal is applied to the dedicated low frequency speaker 51 by the
branching circuit. In this band, since the wavelength is longer than the cabinet size of the speaker
device, the sound wave also wraps around the back of the cabinet due to the diffraction effect
and becomes almost omnidirectional. Next, in the midrange, a cone-type mid-range speaker E52
is mounted upward on the cabinet 53, and the radiated sound is uniformly radiated in all
directions in the horizontal plane by the midrange reflection block 54 to exhibit
nondirectionality. The directivity pattern of this band is the same as the directivity pattern 11 of
FIG. Further, the same mid-range signal (300 to 2,000 Hz in this example) as the cone mid-range
speaker E52 described above is applied to the cone mid-range speaker F55 and the cone midrange speaker G56 through the branching circuit 59. When the cone-type mid-range speakers 55
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6
and 56 have opposite phase signals applied to each other and one vibrates so as to make the
pressure on the front of the diaphragm dense, the other is so wired that the pressure becomes
coarse. Is a dipole source. The polar coordinate pattern of this band becomes the directivity
patterns 12a and 12b in the same manner as in the first embodiment shown in FIG. When the
reproduction levels of the cone-type mid-range speakers E, F and G are combined, the sound
pressure directivity pattern becomes unidirectional like the dipole-type sound pressure
directivity pattern 13. The following description is the same as that of the first embodiment.
[0016]
In the first, second and third embodiments, the high-pitched dedicated speaker (tweeter) is
provided, but the effect of the present invention is exhibited in the middle to low range, and the
high-pitched dedicated speaker (tweeter) is not provided. Things are also included.
[0017]
As described above, according to the speaker device of the present invention, a speaker having
no directivity in the horizontal plane in the middle bass region and a speaker having dipole
directivity in the horizontal plane in the middle bass region are provided. It has a configuration in
which the acoustic centers are matched and combined.
[0018]
In the speaker installation method using the speaker device according to the present invention,
the unidirectional speaker device is installed on both sides in front of the ideal listening position,
and the maximum directivity gain direction of the right speaker device is listened to the left from
the ideal listening position. It is a method of setting the maximum directivity gain direction of the
left speaker device toward the listening position on the right side of the ideal listening position
toward the position.
[0019]
Therefore, the change in sound image localization at the listening position is small, and the
excellent service area of sound image localization can be expanded.
As a secondary effect, since the mid-range radiation to the back of the speaker device is small,
the influence of the reflection of the sound on the back and side walls of the speaker is small, and
the change in sound quality depending on the installation location can be reduced.
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[0020]
Brief description of the drawings
[0021]
FIG. 1A is a partially transparent top view of the speaker device according to the first
embodiment of the present invention.
[0022]
Fig. 2 Polar coordinate directional characteristic diagram of the loudspeaker apparatus in the
first embodiment
[0023]
Similarly FIG. 3 is an explanatory view of directivity and sound image localization of the speaker
device when the speaker device of the first embodiment is installed in a room
[0024]
FIG. 4A is a partially transparent top view of the speaker apparatus according to the second
embodiment of the present invention.
[0025]
Similarly, the directional characteristic diagram when the speaker apparatus of the second
embodiment is installed in a room
[0026]
FIG. 6 (a) is a partially transparent top view of the speaker apparatus according to the third
embodiment of the present invention.
[0027]
Fig. 7 An explanatory view of directivity and sound image localization of the speaker device when
the speaker device of the conventional example is installed in a room
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[0028]
Explanation of sign
[0029]
2 mid-range driver A3 cabinet 4,5 horn wall 6 mid-range driver B7 horn 8 tweeter
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