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JP2004146953

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2004146953
An audio reproduction method for achieving high presence, close to the real world, is obtained by
a simple means. SOLUTION: From a speaker, a sound emission surface of a speaker S is directed
at a distance and directed to a reflector made of a wall 1 or a ceiling 3 or a floor 4 or any
combination thereof in a room The emitted sound waves are reflected and diffused to the room
by the reflector. [Selected figure] Figure 2
Sound reproduction method and sound apparatus
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound reproducing method for generating sounds such as music and voice by a speaker
connected to an amplifier, and more particularly to a sound reproducing method for realizing
high presence. . [0002] As a system for obtaining reproduction sound from speakers, a stereo
system is generally used in which a sound emission surface of a pair of speakers distributed to
left and right channels is directed to a listener to drive the speakers. . Also, in recent years, a
surround system in which a center channel and a rear channel are provided in addition to the left
and right channels, and speakers are distributed to the front left, right, center, and rear left and
right has become widespread. In the case of the former system, since the sound wave is emitted
from a fixed point called a speaker, it is an optimal reproduction method when the listener seeks
a sense of localization or movement of a sound image with respect to sound. Also, the latter
system is adopted as a sound reproduction system at the time of watching a picture such as a
movie, but it is the best reproduction method to enjoy the sense of localization and movement of
sound images in front, back, left and right linked to the picture. . SUMMARY OF THE INVENTION
The above-described prior art reproduces a sense of accurate localization and movement of a
sound image, so it seems that a high sense of reality can be realized. However, in the real world,
the elements of the sound image are not limited to this, and there are an infinite number of
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sound sources that emit sound, and the sound is emitted from the four rounds of the listener.
Therefore, in the case of seeking a sense of presence with respect to such an element, the sense
of presence obtained by the above-described prior art reproduction method is artificially too
much, resulting in dissatisfaction that the sense of reality is poor. Also, in the case of listening to
music, it is not all the way to enjoy listening to the music, concentrating on the music and
thinking up to every one of the instruments. In some cases, music is taken as an element of the
healing environment. The sound sought in such a case is a "wrapping sound", and the emphasis
on the localization and movement of the sound image has rather hampered viewing. On the other
hand, for example, in stores such as restaurants and shops where the personnel are dispersed in
various places in the room, the listeners are located at different locations, and the condition of
the sound reproduction method according to the prior art is just good for some people. However,
for other people, there was a problem that the balance of the sound echo was unnatural or the
volume was inadequate. [0007] Conventionally, as a means for reproducing sound that does not
give a sense of localization or movement of a sound image, there has been a reproduction
method using a nondirectional speaker system.
However, even in this method, the listener is still listening to the sound directly emitted from the
speaker, and the problem of the change in the degree of listening depending on the distance of
the listener from the speaker has not been solved. Also, as a different means, there is a speaker
wall that arranges innumerable speakers on the wall, but in a typical theater or listening room,
such a speaker installation area is secured in general homes and stores It was impossible, and the
cost required for it was unrealistic. Furthermore, as a different means, there is also a flat speaker
system which vibrates a large plate instead of cone paper, but there is a problem that itself
occupies a large area, and structurally it is difficult to reproduce high range. After all, there is a
problem that the tweeter must be separately provided, and the sound image is localized.
SUMMARY OF THE INVENTION The present invention has been made in view of the problems of
the prior art described above, and is full of sense of reality that envelops a listener without being
aware of a specific sound source. It is an object of the present invention to provide a system for
realizing a sound by simple means. That is, according to the sound reproduction method of the
present invention, the sound emission surface of the speaker is directed at a distance and
directed to a reflector made of a wall or a ceiling or a floor or any combination thereof. The
reflector reflects and diffuses the sound wave emitted from the speaker by the reflector. BEST
MODE FOR CARRYING OUT THE INVENTION Specific embodiments of the present invention will
be described below with reference to the attached drawings. The feature of the present invention
is to use existing walls, ceilings, and floors in a room as reflectors, and collide with the sound
waves from the speakers to obtain surface reflected and diffused sound. Therefore, it is desirable
that walls, ceilings, and floors that are used as reflectors reflect sound waves to some extent, for
example, that walls and ceilings are wood or plastered walls rather than crosses, floors are
carpeted Flooring is more desirable. Further, it is desirable that the sound wave emitting surface
of the speaker be spaced apart from the reflector and directed obliquely to the reflecting surface.
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Several arrangement examples of the speaker are shown in FIG. 1 to FIG. (1) In FIG. 1, two
speakers S are disposed back to back near the center of the room, and the sound wave emitting
surfaces are directed near the corners of the front and rear walls 1, 1 respectively.
In the figure, arrow lines indicate the flow of sound waves in this case (the same applies
hereinafter). (2) In FIG. 2, the speaker S has three back-to-back pairs in the front and back near
the center of the room, and one back-to-back pair in the middle between them. Are respectively
directed to the front and rear walls 1, 1 and the vicinity of the center of the left and right walls 2,
2. (3) FIG. 3 shows an example of the arrangement of the speakers in the vertical direction. Here,
the speakers S are arranged back to back near the center of the ceiling of the room, and these
sound emission surfaces are front and rear walls 1, 1 It is directed obliquely downward. In
addition, the code ¦ symbol L in a figure is a listener. (4) FIG. 4 also shows an example of the
arrangement of the speakers in the vertical direction. Here, a pair of speakers S is arranged at a
position slightly lower than the vicinity of the center of the ceiling of the room. It is directed
obliquely upward to the ceiling 3. (5) In FIG. 5, a pair of speakers S are disposed near the wall of
the ceiling 3 and near the wall of the floor 4, and the sound emitting surface of the speaker on
the ceiling side is directed obliquely downward to the wall 1 The sound emission surface of the
floor side speaker is directed obliquely upward to the wall 1. (6) In FIG. 6, a pair of speakers S are
disposed near the front wall 1 of the left and right walls 2 and 2 respectively, and the sound
emitting surfaces of these speakers are directed obliquely to the wall 1 There is. (7) In FIG. 7, the
speaker S is disposed near the front wall 1 of the left and right walls 2, 2 and near the front wall
1 of the floor 4, and the sound emission surface of the speaker on the wall 2 side is a wall The
sound emission surface of the speaker on the floor 4 side is directed obliquely upward to the wall
1. FIG. 8 is a view showing another embodiment of the present invention, in which sound
absorbing surfaces 1A, 2A and 4A are disposed on a part of the wall 1, a part of the wall 2 and a
part of the floor 4, respectively. By doing this, the sound is attenuated only in this vicinity. This
embodiment is useful, for example, in a store where it is desired to secure a low sound space near
the telephone. The speaker S used in the above-described sound reproducing method has a
known configuration in which a speaker unit is accommodated in an enclosure. In this case, clear
reflected sound can be obtained by using a speaker unit with high directivity. On the other hand,
as described above, in the present invention, it is as described above that the sound is
reproduced without any sense of localization of the sound image and in the sound of enveloping
without any awareness of the sound source.
Therefore, it is desirable that the speaker S be as invisible as possible, and that the installation
space be as small as possible. A sound reproducing apparatus provided with such conditions will
be described based on FIGS. 9 to 12. FIG. 9 is a view showing a sound reproduction device in
which the speaker S is accommodated in the furniture 10. Although a sofa is illustrated as a
furniture here, it is needless to say that a furniture is not restricted to this, for example, may be a
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cabinet, a wagon, or other furniture. One or more of the speakers S are housed with the sound
emitting surface exposed on the side or back other than the front of the furniture, and the sound
emitting surface is directed in an oblique direction. In this embodiment, the speaker S can be
rocked back and forth and to the left and right with respect to the furniture. FIG. 10 is a view
showing a sound reproduction device in which the speaker S is accommodated in the indoor
device 20. As shown in FIG. Although a flower pot is illustrated here as an indoor apparatus item,
the indoor apparatus item is not limited to this, and it is a matter of course that it may be a stand
ashtray, umbrella stand, figurine or other furniture. One or more of the speakers S are housed
with the sound emitting surface exposed on the side surface or the back other than the front of
the indoor device, and the sound emitting surface is directed in an oblique direction. FIG. 11 is a
view showing a sound reproduction device in which the speaker S is housed in the lighting
fixture 30. As shown in FIG. The lighting fixture 30 is suspended from the ceiling via the hanging
fixture 31, and one or more speakers S are accommodated on the top surface of the lighting
fixture with the sound wave emitting surface directed obliquely upward. FIG. 12 is a view
showing a sound reproduction device in which the speaker S is accommodated in the table 40. As
shown in FIG. One or more speakers S are accommodated on the lower surface of the top plate
41 of the table with the sound emitting surface directed obliquely downward. The present
invention having the above-described structure has the following unique effects. (1) Since the
area of the reflective surface is recognized by the listener as a sound source of sound, it is
possible to obtain a sense of reality that is close to the real world, such as being enclosed. (2) The
speaker itself can be small and the number is small because it reflects and diffuses the sound
wave from the speaker, and the reflector uses the existing wall, ceiling and floor, so the
conventional speaker wall Compared with the above, the cost is much lower and the installation
area of the device is small, so that it can be easily introduced to general households and stores.
(3) When the walls, ceilings, and floors of the entire room are used as reflectors, a realistic
surround effect can be obtained, and the same listening condition can be obtained anywhere in
the room.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway plan view showing an
example of arrangement of speakers in the sound reproduction method of the present invention.
FIG. 2 is a partially cutaway plan view showing an example of arrangement of speakers in the
sound reproduction method of the present invention. FIG. 3 is a partially cutaway side view
showing an example of arrangement of speakers in the sound reproduction method of the
present invention. FIG. 4 is a partially cutaway side view showing an example of arrangement of
speakers in the sound reproduction method of the present invention. FIG. 5 is a partially cutaway
side view showing an example of arrangement of speakers in the sound reproduction method of
the present invention. FIG. 6 is a partially cutaway plan view showing an example of arrangement
of speakers in the sound reproduction method of the present invention. FIG. 7 is a partially
cutaway perspective view showing an example of arrangement of speakers in the sound
reproduction method of the present invention. FIG. 8 is a partially cutaway perspective view of
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another embodiment of the sound reproducing method according to the present invention. FIG. 9
is a perspective view of the sound reproduction device of the present invention. FIG. 10 is a
perspective view of a different embodiment of the same. FIG. 11 is a perspective view of the same
embodiment but different embodiment. FIG. 12 is a perspective view of the same embodiment,
but different embodiment. [Description of the code] 1 wall 2 wall 3 ceiling 4 floor S speaker
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