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JP2001211495

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DESCRIPTION JP2001211495
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker system for reproducing stereo sound, and more particularly to a stereo speaker system
which can obtain a stereo feeling which does not change when listening from any direction
without assuming that the speaker system is heard from a specific direction. .
[0002]
2. Description of the Related Art A conventional stereo speaker system consists of a pair of left
and right speaker systems installed at a predetermined distance, and a listener listens to these
two speaker systems in the position looking forward and backward respectively. I was watching a
good stereo sound.
[0003]
Furthermore, a speaker system is added in the middle between the left and right speaker systems
to configure a stereo speaker system with a center channel, and the listener listens to the left and
right speaker systems in front of left and right and the center channel speaker system in front
view I was watching stereo sound with improved localization of the center sound.
[0004]
In the conventional stereo speaker system, the listener can move to one of the speakers because
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the listener can not obtain a good stereo feeling unless he / she listens to the speaker system at
positions looking forward and backward respectively. Good stereo feeling can not be obtained
when approaching the system or where the left and right speaker systems overlap in the same
direction.
Also, when a speaker system is placed at the center and the listeners surround the surroundings
so that many listeners can watch at the same time, there is a problem that only a small number of
listeners can hear good stereo sound. there were.
This problem is also true for stereo speaker systems with center channels.
[0005]
In the stereo speaker system of the present invention, four or more pairs of speaker units
emitting left and right sounds are alternately arranged on the circumference, and each speaker
unit emitting the right sound is When viewed from above, the radiation direction of the sound is
clockwise with a line segment connecting the speaker unit from the center of the circle to the
outside and an angle of 45 degrees or more and 90 degrees or less. Each speaker unit that emits
the left sound is counterclockwise viewed from above and the radiation direction of that sound
makes an angle of 45 degrees or more and 90 degrees or less with the line segment connecting
the speaker units from the center of the circle. It is characterized by facing.
[0006]
Furthermore, the stereo speaker system with center channel according to the present invention
has four or more sets of speaker units that emit left and right and center sounds, the speaker
units that emit left and right sounds on the same circumference, and the speaker unit that emits
center sounds in the same circle. And place them repeatedly in the order of right-center-left to
left-center-right on a circle sharing the center. Each speaker unit that emits the right sound is
clockwise when viewed from above and the radiation direction of that sound makes an angle of
45 degrees or more and 90 degrees or less with the line segment connecting the speaker units
from the center of the circle. direction. In each of the speaker units emitting central sound, the
radiation direction of the sound coincides with a line segment connecting the speaker units from
the center of the circle. Each speaker unit that emits the left sound is counterclockwise viewed
from above and the radiation direction of that sound makes an angle of 45 degrees or more and
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90 degrees or less with the line segment connecting the speaker units from the center of the
circle. It is characterized by facing.
[0007]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a stereo speaker
system according to claim 1 of the present invention is shown in FIG. 1 with a plan view seen
from above and with a perspective view in FIG. In this example, eight speaker units, that is,
speaker units L1 to L8 for reproducing the left sound and speaker units R1 to R8 for reproducing
the right sound are used. These are alternately arranged on the circumference, R1 to R8 turn
clockwise at an angle ? with the straight line connecting the units from the center of the circle,
and L1 to L8 turn counterclockwise at the same angle ? . The radiation angles of the two
adjacent speaker units facing each other are 90 degrees, and ? is 57 degrees.
[0008]
In the present speaker system 1, when the listener is at position 2, the sound from the L1 and R3
speaker units can be heard best, and a good stereo feeling can be obtained by these. The L2 and
R2 speaker units are attached close to the center, and the separation of the sound is not good
enough to give a sufficient stereo feeling, but the sound radiation direction is deviated from the
direction of the listener and is weaker than the L1 and R3 sounds hear. Moreover, except for low
directivity low-pitched sounds, the sound of the other speaker units is even weaker, so the
influence on the sense of stereo is small.
[0009]
In addition, when the listener is at position 3, the sound from the L1 and R2 speaker units can be
heard the most, and a good stereo feeling can be obtained by these. The L2 and R1 speaker units
located at the center of the front are weak because the radiation direction of the sound largely
deviates from the direction of the listener, and the stereo feeling provided by L1 and R2 does not
deteriorate much. In addition, the sound of the speaker units other than these is even weaker, so
the influence on the stereo feeling is small.
[0010]
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When the listener is in the middle position of 2 and 3, it becomes these middle hearing sense, but
a good stereo feeling is obtained by the left sound from L1 and the right sound from R2, R3.
From the above and the symmetry of the speaker system 1, it can be understood that a good
sound with a sense of stereo can be heard at any position around 1.
[0011]
According to the speaker system of the present invention, the directivity of the speaker unit is
used to selectively hear the sound from a specific speaker unit according to the position of the
listener among the speaker units arranged in the vicinity. A function is realized that a good stereo
feeling can be obtained regardless of the position of the listener. In order to fulfill this function,
the direction of the speaker unit that reproduces the left and right sounds, that is, the radiation
direction of the sound, is a counterclockwise direction and an angle ? connecting the units from
the center of the circle of the speaker units. It is necessary to turn clockwise, and it is preferable
that ? be 45 degrees or more and 90 degrees or less.
[0012]
Next, an example of a stereo speaker system according to claim 2 of the present invention is
shown in FIG. 3 with a plan view seen from above, and in FIG. 4 with a perspective view. In this
example, eight speaker units are used: speaker units L11 to L18 for reproducing the left sound,
speaker units R11 to R18 for reproducing the right sound, and speaker units C11 to C18 for
reproducing the center sound. There is. These are repeatedly arranged counterclockwise
repeatedly in the order of left-center-right, and the speaker units of the left and right sounds are
located on the same circumference, and the speaker units of the middle sound are located on a
slightly smaller circumference. The radiation angles of the left-center-right speaker units adjacent
to each other are adjacent to each other at 45 degrees, and the radiation angles of the left and
right speaker units are 90 degrees. Here, R11 to R18 turn clockwise with a straight line
connecting each unit from the center of the circle to form an angle ?, L11 to L18 turn
counterclockwise at the same angle, and C11 to C18 turn from the center of the circle to the
speaker unit It points outward on a straight line going out. In this example, ? is 60 degrees.
[0013]
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4
In the present speaker system 4, when the listener is at the position 5, the sound from the
speaker units L11, C12, and R13 is most heard, and these give a good stereo feeling of the
localization of the central sound. The L12 and R12 speaker units approach the center, and C11
and C13 are mounted away from the center, so they do not give a good sense of stereo, but the
sound radiation direction deviates from the listener's direction L11 and C12 , R13 weaker than
the sound. Moreover, except for low directivity low-pitched sounds, the sound of the other
speaker units is even weaker, so the influence on the sense of stereo is small.
[0014]
Also, when the listener is at position 6, the sound from the speaker units L11, C11, C12, and R12
can be heard the most and, by these, good stereo feeling with good localization of the central
sound can be obtained. The L12 and R11 speaker units located at the front center are weak
because the radiation direction of the sound largely deviates from the direction of the listener,
and the stereo feeling provided by L11, C11, C12, and R12 is not deteriorated so much. In
addition, the sound of the speaker units other than these is even weaker, so the influence on the
stereo feeling is small.
[0015]
When the listener is in the middle position of 5 and 6, it becomes these middle hearing sense, but
the left audio from L11 and the central audio from C11 and C12, the right audio from R12 and
R13 the good stereo I can get a feeling. From the above and the symmetry of the speaker system
4, it can be seen that a good sound with a sense of stereo can be heard at any position around 4.
[0016]
The number of speaker units required for the speaker system according to the present invention
requires at least four sets of rotational symmetry to be provided with at least one pair of left and
right or left and right one center speaker units. .
[0017]
A plan view of an embodiment according to claim 2 in which four sets of left and right and center
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speaker units are used is shown in FIG.
If C21 to C24 are removed from this embodiment, it becomes an embodiment of claim 1. Also in
this embodiment, although it is possible to hear a sound with a sense of stereo from any position,
the variation in the sense of hearing depending on the position of the listener is somewhat large.
In order to suppress this variation, preferably, six or more sets of speaker units are required, and
more preferably, eight or more sets of speaker units are used as shown in FIGS. 1 to 4.
[0018]
The speaker system of the present invention utilizes the directivity of the speaker unit, and it is
preferable that the speaker unit to be used has a somewhat strong unidirectionality. FIG. 6 shows
the speaker system 1 shown in FIGS. 1 and 2 in which the boards 8 for enhancing directivity are
arranged side by side and attached to the front of the speaker unit. , Preferred to further improve
the stereo feeling of the present speaker system.
[0019]
Industrial Applicability By using the omnidirectional stereo speaker system of the present
invention, a listener can listen to good stereo sound from any direction.
[0020]
Brief description of the drawings
[0021]
1 is a plan view of the embodiment of claim 1 of the present invention seen from above.
[0022]
2 is a perspective view of the embodiment of claim 1 of the present invention.
[0023]
3 is a plan view of the embodiment of claim 2 of the present invention seen from above.
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[0024]
4 is a perspective view of the embodiment of claim 2 of the present invention.
[0025]
5 is a plan view of another embodiment of claim 2 of the present invention seen from above.
[0026]
FIG. 6 is a view showing how an acoustic lens for enhancing the directivity of the speaker unit is
attached.
[0027]
Explanation of sign
[0028]
1 stereo speaker system 2, 3, 5, 6 according to claim 1 of the present invention listener 4, 7
stereo speaker system L1 to L8 with center channel according to claim 2 of the present invention
L18, L21 to L24 иии Left speaker unit R1 to R8, R11 to R18, R21 to R24 иии Left speaker unit C11
to C18, C21 to C24 и и и Center speaker unit 8 и и и? Plate (acoustic lens)
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