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JP2006109339

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DESCRIPTION JP2006109339
PROBLEM TO BE SOLVED: To give freedom to an arrival range of a sound wave having directivity
and solve a problem caused by an increase in size of a sound emitting means such as an array
speaker. SOLUTION: An acoustic space S is separated by a shield B into a first space S1 and a
second space S2. The acoustic beam emitted from the array speaker ASP travels toward the beam
reflectors P1 to P3 at radiation angles θ1 to θ3, and is reflected by the beam reflectors to reach
the listeners L1 to L3. Therefore, the listener feels that the sound image is localized in front of
itself. As described above, since the array speaker is installed in the second space separated from
the first space in which the listener is located, it is necessary to secure the space in the first space
and install the array speaker. Absent. In addition, even if the first space is a room with high
design, the array speaker ASP does not disturb the sense of unity of the design. [Selected figure]
Figure 2
Sound system
[0001]
The present invention relates to a technique for emitting voice or musical tone as a directional
sound wave and causing a listener to listen.
[0002]
A speaker system in which a plurality of speaker units are arranged in a row direction or plane is
generally called an array speaker.
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1
In this array speaker, by appropriately controlling the delay time of the audio signal supplied to
each speaker unit, it is possible to emit a directional sound wave (hereinafter referred to as an
acoustic beam) in a desired direction. That is, the point that the direction of the acoustic beam
can be freely changed without changing the direction of each speaker unit itself is the most
characteristic of the array speaker. As a technology to which this type of array speaker is applied,
for example, in Patent Document 1, an array speaker is installed on the ceiling of a room where a
listener is present, and an acoustic beam emitted from this array speaker is reflected on a wall
surface to produce a sound image. A technique for localization is disclosed. Further, Patent
Document 2 proposes a technology that enables sound images to be localized in any direction of
360 ° as viewed from a listener by rotating the above-described array speaker.
[0003]
In the prior art described in Patent Documents 1 and 2, an acoustic beam is emitted from above
the listener to a wall surface, and the wall surface reflects the acoustic beam in the direction in
which the listener is present. However, according to the conventional technology, the acoustic
beam can be made to reach in the conventional technology because ordinary reflections can only
occur on the specular surface and the installation position of the array speaker is restricted to an
area that does not get in the way like a ceiling. There is a problem that the possible range is
limited. In addition, since the array speaker is composed of a plurality of speaker units, it tends to
be relatively large. Therefore, an installation area must be secured in the acoustic space to meet
the size of such an array speaker. In addition, for example, in a highly designed acoustic space
such as a reception room or a model room, the presence of the array speaker may hinder the
unification of the design of the entire space. JP-A-9-233591 JP-A-9-233588 JP
[0004]
The present invention has been made in view of such backgrounds, and the object of the present
invention is to provide the freedom of reaching the directional sound wave range as compared
with the prior art and to increase the size of the sound emitting means such as an array speaker.
It is about solving the problem.
[0005]
In order to solve the above-mentioned problems, the present invention is directed to a reflection
means which is disposed in a first space separated from another space by a shield and reflects
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2
the emitted sound wave toward the listening area, and a shield And a sound emitting means
disposed in a second space separated from another space and emitting directional sound waves
based on an audio signal toward the reflecting means.
According to this acoustic system, although the sound emitting means is disposed in the second
space separated from the first space, the directional sound wave is transmitted to the listening
area in the first space. It can be reached. That is, it is possible to give more freedom to the reach
of the directional sound wave. Moreover, it is not necessary to secure the arrangement area of
the sound emission means in the first space. Since the first space plays a role of accommodating
the listener, it is convenient if the arrangement space of the sound emitting means can be
omitted from the first space. In addition, even if the first space is a room with high designability,
the unity of the design of the entire space is not hindered by the presence of the sound emission
means. Furthermore, from the viewpoint of the listener in the listening area, a sound can be
heard despite the fact that the sound emitting means is not found in the space where the user is
present, and the listener can perceive a unique interest.
[0006]
In the present invention, it is desirable that the wall surface of the first space be formed by at
least a part of a sound absorbing material. This makes it possible to avoid that the directional
sound wave emitted by the sound emitting means is reflected by the wall surface.
[0007]
In a preferred embodiment of the present invention, the apparatus further comprises reflective
surface drive means for changing the direction of the reflective surface of the reflection means.
According to this aspect, it is possible to change the orientation of the reflection surface of the
reflection means, for example, according to the position or size of the listening area.
[0008]
Further, in another preferred aspect of the present invention, a plurality of the reflecting means
are disposed in the first space, and the traveling direction of the directional sound wave emitted
by the sound emitting means is the plurality of reflections. A sound image moving means is
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provided which is moved in a direction from the direction toward any of the reflecting means of
the means toward the other reflecting means. According to this aspect, the sound image can be
localized at a desired position of the reflection means, and it is possible to produce a unique
sense of presence or special sound effect in, for example, a movie or a video game.
[0009]
Further, in another preferred embodiment of the present invention, the first space is further
separated into a plurality of spaces by a shield, and the first space is radiated to a listening space
in which a listening area is present among the plurality of spaces. A reflection means for
reflecting an incoming sound wave toward the listening area is disposed, and in one or more
reflecting spaces where the listening area does not exist among the plurality of spaces, an
incoming sound wave is disposed in the listening space Either the reflecting means for reflecting
towards the reflecting means or the reflecting means for reflecting towards the reflecting means
arranged in the reflecting space closer to the listening space is arranged. In this way, the
directional sound wave can be guided to the listening area by repeating the reflection of the
directional sound wave a plurality of times.
[0010]
First, the principle of the array speaker used in the present embodiment will be briefly described.
FIG. 1 is a diagram showing an electrical configuration of an array speaker ASP configured by
two speaker units SP1 and SP2. In FIG. 1, the central axes Y1 and Y2 of the speaker units SP1
and SP2 are parallel to each other, and the cones (diaphragms) of the speaker units SP1 and SP2
are disposed at the same position in the direction of the central axes Y1 and Y2 It shall be done.
Further, the distance between the central axis Y1 and the central axis Y2 is "a", and the angle
from the central axes Y1 and Y2 to the radiation directions Y11 and Y22 (hereinafter referred to
as radiation angle) is "θ". Assuming that the sound receiving point is far enough, the path
difference between the sound wave emitted from the speaker unit SP1 in the radiation direction
Y11 and the sound wave emitted from the speaker unit SP2 to the radiation direction Y22 is a ·
sin θ.
[0011]
The audio signal is supplied from the input terminal Tin to the speaker units SP1 and SP2 via the
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delay circuits DL1 and DL2. The “audio signal” in the present embodiment is a signal that
indicates various sounds such as human voice and a performance sound of a musical instrument,
and is typically a signal that indicates a waveform on the time axis of the sound. The delay
circuits DL1 and DL2 perform delay processing on the audio signal for the delay times D1 and
D2 (D2 ≧ D1). Therefore, a time difference (D2-D1) occurs between the sound wave emitted
from the speaker unit SP1 and the sound wave emitted from the speaker unit SP2. Since there is
a difference in path of the radiation directions Y11 and Y22 in addition to the time difference
between the two sound waves, the phase relationship between the two sound waves differs
according to the position of the listening area. For example, in a certain listening area, both
sound waves are in phase and added, and the volume is doubled. Also, in a certain listening area,
both sound waves are canceled in opposite phase and the volume becomes zero. Therefore, by
appropriately controlling the delay amount in each of the delay circuits DL1 and DL2, it is
possible to make the sound waves emitted from the array speaker ASP have a desired directivity.
Of course, the principle is the same even if the number of speaker units is increased. Note that
the directivity of the sound wave can be provided even if the phase shift (phase shift) or level
adjustment of the audio signal is performed instead of the delay processing.
[0012]
Further, although the number of channels of the audio signal is one in FIG. 1, the number of
channels may be more. Also, after delay processing is performed on the audio signal of each
channel with an appropriate delay amount, the audio signal subjected to the delay processing is
added and emitted from each speaker unit, whereby an acoustic beam for each channel is
separately provided. It is possible to emit in different directions. For example, it is possible to
emit different musical tones as different acoustic beams or to emit speech of different languages
and dubbed speech of movies as different acoustic beams.
[0013]
Next, embodiments of the present invention will be described in detail. FIG. 2 is a plan view
showing the configuration of the acoustic system according to the embodiment. As shown in FIG.
2, the acoustic space S is separated by a shield B into a first space S1 and a second space S2. In
the second space S2, an array speaker ASP as sound emitting means is provided. On the other
hand, in the first space S1, a plurality of beam reflecting devices (beams in FIG. 2) are provided as
means for reflecting the acoustic beam emitted from the array speaker ASP toward the listeners
(listening areas) L1, L2 and L3. Three reflecting devices P1, P2 and P3 are provided. The inner
wall surface of the first space S1 is formed of a sound absorbing material. The shielding material
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B may be any one as long as it plays a role of separating the space, for example, building
materials such as wall materials and shutters, interior members such as sound insulation
curtains, and various installation objects such as partition panels and houseplants is there.
However, as can be seen from FIG. 2, the shield B does not completely separate the first space S1
and the second space S2, but does not separate the two spaces (hatched portion h in FIG. 2). )
Must be secured at least one place. This is because this space portion (hatched portion h) is a
path of an acoustic beam emitted from the array speaker ASP to the beam reflectors P1 to P3.
[0014]
The array speaker ASP is composed of eight speaker units SP1 to SP8 arranged in a line in the
horizontal direction. FIG. 3 is a block diagram showing the electrical configuration of the array
speaker ASP and its peripheral devices. The audio signal is supplied from the main control unit
CU to the speaker units SP1 to SP8 through the input terminal Tin, the delay circuits DL1 to DL8
and the level control circuits W1 to W8. The delay circuits DL1 to DL8 perform delay or phase
shift (phase shift) of the input audio signal. The level control circuits W1 to W8 attenuate or
amplify the level of the input audio signal. The operation parameters of the delay circuits DL1 to
DL8 and the level control circuits W1 to W8 are set by the control signal supplied from the main
control unit CU. The control unit CU includes a CPU and various memories, and is connected to
the operation unit UI. The operator of the sound system can designate operation parameters to
be set in the delay circuits DL1 to DL8 and the level control circuits W1 to W8 by operating the
operation unit UI. For example, an acoustic beam can be emitted from the array speaker ASP at
an arbitrary emission angle θ by appropriately setting the delay time by the delay circuits DL1
to DL8.
[0015]
From the relationship between the installation position of the array speaker ASP and the
installation position of each of the beam reflectors P1, P2 and P3, if an acoustic beam is emitted
from the array speaker ASP at what degree of radiation angle, the acoustic beam is reflected by
the beam reflector It can be specified whether it can be applied to each of P1, P2 and P3. In the
example of FIG. 2, an acoustic beam can be emitted to the beam reflector P1 by emitting an
acoustic beam from the array speaker ASP at a radiation angle θ1, and an acoustic beam can be
emitted to the beam reflector P2 from an array speaker ASP at a radiation angle θ2. It shows
that if an acoustic beam is emitted from the array speaker ASP at a radiation angle θ3, it can be
applied to the beam reflector P3.
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[0016]
Each of the beam reflectors P1 to P3 has, for example, a parabolic or semicircular reflector 10, a
shaft 20 extending vertically downward from the lower portion of the reflector 10, and a shaft
20, as shown in the perspective view of FIG. And a base 30 for supporting. A motor 40 is built in
the base 30, and the rotation of the motor 40 causes the shaft 20 to rotate in the direction of the
arrow b. Since the shaft 20 and the reflector 10 are fixed, the reflector 10 also pivots in the
direction of arrow c around the axial direction of the shaft 20 as the shaft 20 pivots. That is, the
motor 40 functions as a reflecting surface drive unit that changes the direction of the reflector
(reflection surface). By appropriately adjusting the amount of rotation of the reflector 10, it is
possible to make the reflector 10 just point in the direction of the listener. The amount of
rotation of the reflector 10 may be specified by, for example, operating an operation knob
provided on the beam reflectors P1 to P3, or an operation connected to each of the beam
reflectors P1 to P3 via a communication cable. It may be specified by operating the board. In
response to this operation, the motor 40 rotates the shaft by a designated amount. For example,
when the listener moves, the reflector 10 may be rotated according to the position of the listener,
and the direction of the reflection surface may be adjusted to be directed to the direction of the
listener.
[0017]
Returning to FIG. 2 again, the acoustic beam emitted from the array speaker ASP at, for example,
the radiation angle θ1 travels in the direction of the beam reflecting device P1 located in front
of the listener L1 and is reflected by the beam reflecting device P1. To reach. Therefore, the
listener L1 hears the sound reflected from the beam reflecting device P1 in front of itself, and
feels that the sound image is localized in front of itself. Similarly, acoustic beams emitted from
the array speaker ASP at radiation angles θ2 and θ3 are reflected by the beam reflectors P2
and P3 respectively, and reach the listeners L2 and L3. Therefore, the listeners L2 and L3 will
also hear the sound reflected from the beam reflectors P2 and P3 in front of themselves, and it
will feel as if the sound image is localized in front of itself. In addition, since the directional sound
waves after reaching the respective listeners L1, L2 and L3 are absorbed by the sound absorbing
members on the inner wall surface of the first space S1, there is no need to worry about the
problem caused by the re-reflection.
[0018]
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Although the acoustic beam emitted from the array speaker ASP is extremely directional, some
side lobes (leakage noise) occur. However, since this side lobe is blocked by the shield B, it is
difficult to reach the listeners L1 to L3. Therefore, it is desirable that the shield B be disposed at a
position where it is difficult for the side lobes to reach the listeners L1 to L3. In addition, even if
some side lobes reach the listeners L1 to L3, since the volume of the acoustic beam reflected by
the beam reflectors P1 to P3 is much larger than that of the listeners, the serious problem is
caused by the side lobes. It is unlikely to be triggered. Also, a sound absorbing member may be
installed behind the beam reflecting devices P1 to P3 so that the side lobes can absorb sound by
this sound absorbing member. In this case, even if the entire wall surface of the first space S1 is
not configured by the sound absorbing member, a part of the wall surface such as the back of the
beam reflecting devices P1 to P3 may be configured by the sound absorbing member.
[0019]
As described above, according to the present embodiment, since the array speaker ASP is
installed in the second space separated from the first space S1 in which the listener is located, in
the first space, the array speaker is used. Does not require space for installation. Since the first
space plays a role of accommodating the listener, it is convenient from the viewpoint of the
accommodation capacity if the installation area of the array speaker can be omitted. Further,
even if the first space is a room with high designability, the sense of unity of the designability is
not inhibited by the presence of the array speaker ASP. Furthermore, from the listener's point of
view, the sound can be heard despite the fact that the speaker is not found in the space where
the user is present (the first space S1), so that the effect of making the listener feel unique can be
expected.
[0020]
The embodiment described above may be modified as follows. There are several ways to block
the acoustic space with a shield. For example, as shown in FIG. 5, the first space S1 and the
second space S2 may be separated by a plurality of shields B1 and B2. Furthermore, if there is a
sufficient distance between the acoustic beam and the acoustic beam, a slit-like shield B3 may be
provided. The higher the degree of shielding by the shield, the more the side lobes can be
prevented as described above. Also, from the listener's point of view, although the sound is heard
from somewhere despite the high degree of shielding and the large feeling of blockage in the
space, the effect of being able to feel unique interest becomes more remarkable.
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[0021]
Further, as shown in FIG. 6, the first space S1 may be further separated into a plurality of spaces
by a shield. Among the plurality of spaces, a space S1-1 in which a listening area (listener L)
exists is referred to as a listening space, and spaces S1-2 and 1-3 in which a listening area
(listener L) does not exist is referred to as a reflection space. In the listening space S1-1, a beam
reflecting device P1-1 for reflecting the emitted sound wave toward the listening area is installed.
Also, in the reflection space S1-2 closer to the listening space S1-1 in distance, a beam that
reflects the emitted sound wave toward the beam reflecting device P1-1 installed in the listening
space S1-1 Install the reflector P1-2. Then, in the reflection space S1-3 which is far from the
listening space S1-1, a beam that reflects the emitted sound wave toward the beam reflection
device P1-2 installed in the reflection space S1-2 Install the reflector P1-3. In this way, the
acoustic beam can be made to reach the listening area by repeating reflection of the acoustic
beam emitted from the array speaker ASP a plurality of times. Of course, the above mechanism is
the same even if the number of reflection spaces is further increased. Such techniques are also
applicable to large spaces such as holes. For example, if a beam reflector is installed on the stage,
an array speaker is installed on the stage sleeve, and the acoustic beam emitted from the array
speaker is reflected by the beam reflector, the sound image localization effect is given to the
audience at the audience. It becomes possible to give.
[0022]
The beam reflector can use not only the concave surface of the reflector 10 as a reflective
surface but also the rear surface (convex surface) as a reflective surface. When the acoustic beam
is reflected by the concave surface, the acoustic beam travels toward the listening area while
converging as schematically shown in FIG. On the other hand, when the light is reflected on a
convex surface, the acoustic beam after reflection travels while diffusing in space, contrary to the
concave surface. Such a diffuse reflection method is useful, for example, when a large number of
listeners are moving around in a party hall or the like and it is not possible to specify the position
of each listener. Further, instead of the beam reflecting device having the reflecting surface as
described above, a re-radiator formed by connecting a large number of cylindrical, prismatic, or
honeycomb shaped cavities may be used as the reflecting means of the present invention.
[0023]
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In addition, although there are a plurality of beam reflectors installed, if there is only one listener
(that is, there is only one listening area), the following mode can be taken. For example, only one
bundle of acoustic beams may be emitted from the array speaker ASP to only the beam reflectors
directed to the listener among a plurality of beam reflectors. Alternatively, the reflection surfaces
of all the beam reflectors may be oriented in the direction of the listener, and a plurality of
bundles of acoustic beams may be emitted from the array speaker ASP to each of the beam
reflectors. In this case, the delay time of the audio signal is adjusted by the control signal from
the main control unit CU, and the traveling direction of the acoustic beam emitted by the array
speaker ASP is reflected by any of the plurality of beam reflectors. It may be made to move
continuously from the direction toward the device to the direction toward another beam
reflector. In this way, the sound image can be changed, for example, from the left to the right
when viewed from the listener, and it is possible to produce a unique realism or special sound
effect in a movie, a video game, or the like.
[0024]
In the embodiment, an array speaker is used as the sound emitting means, but if the radiation
angle θ can be determined in advance, a directional speaker capable of emitting a directional
sound wave instead of this array speaker May be used. However, in the case of moving the sound
image (that is, in the case of flexibly changing the radiation angle θ), it is desirable to use an
array speaker capable of appropriately changing the radiation angle. In the array speaker, the
delay circuits DL1 to DL8 and the level control circuits W1 to W8 can be configured by a DSP. In
this case, the audio signal from the terminal Tin may be A / D converted and then supplied to the
DSP, and the signal from the DSP may be D / A converted and then supplied to the speaker units
SP1 to SP8.
[0025]
It is a figure explaining the principle for an array speaker to emit an acoustic beam. It is a
schematic diagram which shows the whole structure of the sound system which concerns on one
Embodiment of this invention. It is a block diagram which shows the electrical configuration of
the array speaker and its peripheral device in the same system. It is a perspective view which
shows the external appearance structure of the beam reflection apparatus in the system. It is a
figure which shows the modification of the system. It is a figure which shows the modification of
the system.
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Explanation of sign
[0026]
S: acoustic space, S1: first space, S2: second space, ASP: array speaker, SP1 to SP8: speaker unit,
W1 to W8: level control circuit DL1 to DL8: delay circuit CU: main control unit UI: operation unit
P1 to P3: beam reflection device B: shielding object L1 to L3 listener.
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