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JPH03228499

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DESCRIPTION JPH03228499
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker system used in a stereo device or the like, and more particularly to a speaker system that
emits sound not only from the front surface of the speaker box but also from the rear surface.
[Problems to be Solved by the Prior Art and Invention] There is a problem that it is difficult to
reproduce realistic sound in a stereo device using a conventional speaker system. This is due to
the fact that the sound source, for example in the case of a stringed instrument, the phased
reflected reflections through the various paths through which the sound is emitted not only from
the front side but also from the back side of the instrument reach the listener's ear In the above,
the speaker unit is attached only to the front side surface, and there is no radiation
corresponding to the sound radiated from the back side of the musical instrument, and no
reflected sound with the phase difference is generated. On the other hand, focusing on the fact
that the presence of reflected sound from the rear side of the speaker system is important for
achieving a sense of reality, the speaker unit is disposed toward the corner of the room, and the
rear and side walls of the speaker system There is a speaker system that uses the reflected sound
from the In the case of this speaker system, there is a problem that although the sense of reality
is improved, it is difficult to obtain a sense of localization since the speaker unit is not directly
facing the listener. There are speaker systems that use direct sound and indirect sound to solve
these problems. In this speaker system, a speaker unit is attached to the front side surface and
the rear side surface of the speaker box, direct sound is emitted from the speaker unit attached
to the front side surface of the speaker box, and the speaker system is attached to the rear side
surface By reflecting the sound emitted from the speaker unit on the wall behind the speaker
box, a sense of localization and realism are obtained. In this speaker system, all speaker units
attached to one speaker box are driven in the same phase. Therefore, there is no problem when
the sound is small and the movement amount of the speaker cone is small, but when the sound is
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large and the movement amount of the speaker cone is large, the material of the speaker cone is
not breathable like plastic instead of paper. In this case, the air braking resistance prevents the
movement of the spiece cone by preventing air from entering or leaving the speaker box, which
not only reduces the conversion efficiency of the speaker system but also the fidelity of the
sound to be reproduced. There is a problem of being lost. The fact that a plurality of speaker
units are driven in the same phase means that when the same drive signal is applied to a plurality
of speaker units, the cones of the speaker units are both in the same direction, for example, the
cones of one speaker unit When moving toward the inside of the speaker box, the cone of the
other speaker unit is also driven to move toward the inside of the speaker box.
Therefore, in a normal speaker system, the child terminals of both speaker units are connected to
the + side output terminal, and one terminal is connected to the one side output terminal. And, as
a matter of course, when the speaker unit is driven in the opposite phase, when one speaker cone
moves toward the inside of the speaker box, the cone of the other speaker unit faces the outside
of the speaker box Driven to move. Therefore, in a normal speaker system, the child terminal of
one speaker unit and the one terminal of the other speaker unit are output terminals on the +
side, and the one terminal of one speaker unit and the child terminal of the other speaker unit
are one Connected to the output terminal on the side. An object of the present invention is to
provide a speaker system that solves these problems, that is, a speaker system capable of
obtaining a sense of localization and realism and having a high conversion efficiency and a
higher fidelity. [Means for Solving the Problems] In the present invention, in order to solve the
above problems, the speaker units are attached to the front side surface and the rear side surface
of the speaker box, and phases opposite to each other from the surfaces on both sides of the
speaker box In the first invention, the speaker units are attached to the front and back surfaces
of the speaker box, and the speaker units are driven in opposite phases to each other. The
speaker system according to the second aspect of the present invention is the speaker system
according to the second aspect of the present invention, wherein a plurality of speaker units by
band are attached to the front surface of the speaker box, and a plurality of speaker units by
band are attached to the rear surface. Speaker units of the same band that are individually
attached and are respectively attached to the front and back surfaces are driven in opposite
phases to each other The speaker system according to the third aspect of the present invention is
the speaker system according to the third aspect of the present invention, wherein a plurality of
band-specific speaker units are provided on the front surface of the speaker The mounted
speaker units of the same band are mounted facing each other, and the speaker units mounted
facing each other are connected so as to be driven in opposite phase with each other, and facing
each other by band A speaker system is characterized in that a partition plate is provided on the
both sides of the attached speaker units. FIG. 1 shows the basic configuration of the speaker
system of the present invention. Note that this is an overhead view of a stereo speaker system
using the speaker system of the present invention, in which the speaker system and the wall are
shown in cross section.
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In this speaker system 1.1 ', the speaker units 5, 6, 5 °, 6 ° are attached to the front surface 3,
3' and the rear surface 4, 4 of the speaker box 2.2 ". These speaker units are connected to be
driven in phases opposite to each other. In this speaker system, the speaker unit 5,5 mounted on
the front surface 3,3 'of the speaker box 2,2' is radiated directly from the speaker unit 5,5
'speaker mounted on the back surface 4,4' The sound emitted from the unit 6.6 ° is reflected by
the back wall 7 and the side wall 8.8 ', and the reflected sound with a phase difference is
transmitted to the listener through paths as shown by arrows in the figure. Reach my ears. In this
figure, the path of sound is simplified for the convenience of explanation, but the path of the
actual sound is, besides these, reflected by a ceiling, a speaker box or the like, etc., and is more
complicated. [Operation] The operation of the speaker system of the present invention will be
described with reference to FIG. As explained earlier, if the loudspeaker units are connected to be
driven in reverse phase and the cone of one loudspeaker unit moves towards the outside of the
loudspeaker box, the cone of the other loudspeaker unit Move towards the inside of the speaker
box. When this is applied to the speaker system of the present invention, as shown in FIG. 6A, the
speaker unit 5 attached to the front surface 3 of the speaker box 2 and the speaker unit 6
attached to the rear surface 4 are reversed. When the cone 9 of the speaker unit 5 attached to
the front surface 3 moves toward the outside of the speaker box 2, the cone 11 of the speaker
unit 6 attached to the back surface 4 is driven. It moves toward the inside of the speaker box 2.
In addition, as shown in FIG. 6B, when the cone 9 of the speaker unit 5 which has been cut by the
surface 3 on the front side moves toward the inside of the speaker box 2, it is attached to the
surface 4 on the back side. The cone 11 of the speaker unit 6 moves toward the outside of the
speaker box. In the figure, 10.12 is a magnet of the speaker unit 5.6. Next, the present invention
will be described in detail with reference to FIGS. 3 to 5. FIG. In these figures, FIG. 3 is a crosssectional view of the speaker system as viewed from above, and FIGS. 4 and 5 are cross-sectional
views of the speaker system as viewed from the side. FIG. 3 shows the most general structure of
the speaker system 1 of the present invention.
In this speaker unit, the speaker unit 5 is attached to the surface 3 on the front side of the
speaker box 2 and the speaker unit 6 is attached to the surface 4 on the back side, and the cones
9 and 11 of each speaker unit 5.6 are mutually reversed. It is driven by the phase of FIG. 4 shows
an example of a speaker system in which the speaker system of the present invention is applied
to a three-in-one system in which a high sound speaker unit, a mid sound speaker unit and a low
sound speaker unit are combined. In addition to one set of the high sound speaker unit 13
attached to the front surface 3 of the speaker box 2, the high sound speaker unit 14 and the low
sound speaker unit 15, another 1 is provided on the back surface 4 of the speaker box 2. A pair
of high-sound speaker units 16, mid-sound speaker units 17 and low-sound speaker units 18 are
mounted facing each other with speaker units of the same band, respectively. 16, the speaker
unit 14 and the speaker unit 17, Each driven mutually in reverse phase with Kayunitto 15 and
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the speaker unit 18. In this 3-work speaker system, depending on the network used, the midsound speaker unit is reverse to the high-sound speaker unit and the low-sound speaker unit like
a normal 3-work speaker system. It may be driven by the phase of. Further, it is needless to say
that this speaker system is not limited to the 3-work system but can be applied to a 2-way or 4work system or more. In addition, in order to simplify the structure, the speaker unit attached to
the back surface is not corresponded to the speaker unit attached to the front surface, for
example, the speaker unit attached to the front surface or the 3 window system In this case, it is
also possible to set the speaker unit attached to the rear surface to a two-way or one-in-one
system with a full range speaker unit in an extreme situation. FIG. 5 is still another embodiment
of the 3-way speaker system shown in FIG. In order to prevent interference between the high
sound speaker unit, the mid sound speaker unit, and the low sound speaker unit in this speaker
unit, a partition plate 19.20 is provided between the facing speaker units. In this speaker system,
interference occurs mainly between the bass speaker unit and the mid-sound speaker unit, and
therefore a partition plate may be provided only between them.
As described above, according to the present invention, the sound radiated from the rear surface
of the speaker system can obtain a sense of localization of the speaker system and a sense of
reality. In addition, since it is easy to move the speaker cone in the speaker box, the efficiency of
the speaker system is improved and the fidelity of the sound to be reproduced is improved. And
if the speaker system of this invention is used for a stereo device, even if a listener is not located
in an equal distance position from both speaker systems, it can taste a stereo feeling. According
to the present invention, by adopting the above configuration, the sound radiated from the rear
surface of the speaker system is reflected by the rear wall and the lateral wall of the speaker
system. Not only can the localized sound and presence feel be obtained because the reflected
sound with a phase difference that passes through various paths reaches the listener's ear, and
the speaker cone moves in comparison with the conventional one in the speaker box Not only
does it improve the efficiency of the speaker system, it also improves the fidelity of the sound
being played.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an overhead view of a state in which the speaker system of the present invention is used
as a stereo device, and FIG. 2 (A).
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(B) is an operation explanatory view of the speaker system of the present invention, and FIG. 3 to
FIG. 5 are embodiments of the speaker system of the present invention. 1.1 ° in the figure · · ·
speaker system, 2.2 ° · · · · speaker box, 3.3 '· · · · · 4, 4 · · · · · · 5.5 × · · speaker unit of the front
side The speaker unit on the back side, 7 rear wall, 8 ° 8 ° side wall 2314 ° 15 ° 9 the
magnet on the rear side speaker unit, 16 high-pitch speaker unit 17・ Speaker unit 18 for
medium sound ・ ・ Speaker unit 20 for low frequency ・ ・ ・ Partition plate
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