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JPH0468698

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DESCRIPTION JPH0468698
[0001]
FIELD OF THE INVENTION The present invention relates to a speaker device for sound field
reproduction. 2. Related Art In recent years, the field of audio and visual has rapidly developed,
and in the reproduction of visual software such as movies, multichannel reproduction such as
Dolby Pro Logic is becoming mainstream. In addition, with the practical use of processors during
digital signal processing, processors etc. for the purpose of reproducing the sound field of a
concert hall have also appeared, and in addition to conventional stereo channel speakers,
auxiliary speakers are also used during music playback. Use cases have increased. As described
above, in recent audio-visual equipment, a speaker system for sound field reproduction is
indispensable, and how to reproduce a natural sound field has become a major issue. One of the
required performances of the left and right front speakers (main speakers) used in normal stereo
reproduction is which sound localization is better. On the contrary, as one of the performances
required of the speaker used for sound field reproduction, the sound image is not localized to a
certain direction or a specific one point of the speaker, the sound spreads throughout the room,
and the listener is There is a question as to whether it is possible to create a natural sound field
that wraps around. As a speaker device for the purpose of conventional sound field reproduction,
a small full-range or multi-way speaker device, a nondirectional speaker device, a speaker device
etc. that uses the reflection of the wall with the speaker unit directed toward the wall It has been
used. Problems to be Solved by the Invention FIGS. 4, 5 and 6 show an arrangement example of
the conventional sound field reproduction speaker device and a sound transmission path thereof
in a plan view of a listening room from above. The configuration and operation will be described
below with reference to the drawings. FIG. 4 shows the case where two small speaker devices are
installed on the rear wall of the listening room and used for sound field reproduction, in which 3
is a speaker system for sound field reproduction and 4 is a front (main) speaker device. FIG. 6
shows the case where two nondirectional speaker devices are installed at the rear of the listening
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room and used for sound field reproduction, and 3 in the drawing is a sound field reproduction
speaker device. FIG. 6 shows the case where the sound emission surfaces of the two speaker
devices are directed to the rear wall of the listening room and used for sound field reproduction,
and 3 in the drawing is a sound field reproduction speaker device. The solid-line arrows 7 in the
figure indicate transmission paths of relatively strong sounds (main sounds). In the examples of
FIGS. 4 and 5, in addition to the direct radiated sound from the speaker device indicated by the
solid line arrow 7 in the figure, the listener receives the reflected sound from the wall surface,
ceiling, floor, etc. , The direct radiation sound from the speaker is the strongest.
Therefore, the sound image is localized at a certain position of the speakers or at a certain point
between two speakers. In the example of FIG. 6, the rear wall reflection (7 in the figure) is
particularly strong, and the mirror image (8 in the figure) localizes the sound image to a portion
of the mirror image or to a point between the mirror images of the two speaker devices. become.
Problems to be Solved by the Invention As can be understood from these examples, in the
conventional sound field reproduction speaker device, the sound in the direction in which the
speaker device is present or in the direction of the mirror image thereof becomes strong. It is
localized at points and has the disadvantage of being conscious of the presence of the speaker
device. In order to solve the above-mentioned drawbacks, a speaker apparatus as shown in FIG. 7
has been proposed. In FIG. 7, 1.1 'is a speaker unit having the same performance, 9 is a cabinet,
and the speaker device 1.1' is electrically connected by the internal wiring 10 so as to operate in
opposite phase with each other, It is input from the input terminal 11. FIG. 8 is an example of
polar coordinate directivity characteristics when the front side of the speaker unit 1 is 0 degrees
and the front side of the speaker unit 1 'is 180 degrees in the speaker apparatus of FIG. 7; The
front shows the sound pressure maximum and the positions equidistant from the speaker units 1
and 1 ′ ′, that is, the directivity in which the sound pressure is minimum at the side of the
cabinet. FIG. 9 is a plan view of the example of the arrangement of the speaker device shown in
FIG. 7 as viewed from above the listening room. As shown in FIG. 9, by arranging the 90-degree
direction of the speaker apparatus for sound field reproduction shown in FIG. 7 to be the
direction of the listener, there is almost no sound pressure due to direct sound to the listener.
The sound image can not be localized and a natural sound field feeling can be obtained. However,
this method requires two identical units for one speaker device, which is expensive, and may be
unsuitable for mounting on a ceiling or a wall due to its heavy weight. The present invention
solves the above-mentioned problems, and realizes a speaker device for reproducing a sound
field, which has a simple structure using one speaker unit and can obtain a natural sound field
feeling without being aware of the presence of the speaker device. The purpose is to Means for
Solving the Problems In order to achieve the above object, the present invention mounts a
narrow directivity horn of the same shape on both the front and back of the speaker unit so that
the opening face of the horn is opposed. Configure. The present invention realizes a speaker
device for reproducing a sound field that has a simple structure using one speaker unit and can
obtain a natural sound field feeling without being aware of the presence of the speaker device
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with the above configuration. it can.
Embodiment An embodiment of a speaker device according to the present invention will be
described with reference to the drawings. The speaker apparatus shown in FIG. 1 has one cone
speaker unit, and two cabinet double narrow directional horns having the same length and shape
on the front and back of the one speaker unit and having opening faces opposite to each other.
And consists of. 2 is an example of polar coordinate directivity characteristics when the front side
of the speaker unit 1 is 0 degrees and the back side of the speaker unit 1 is 180 degrees in the
speaker apparatus of FIG. The maximum sound pressure, the position equidistant from the horn
opening surface, that is, the directivity in which the sound pressure is minimum at the side of the
cabinet is shown. This is because each horn has a narrow directivity, the sound pressure is
originally smaller in the direction of 90 degrees with respect to the opening plane compared to
the front of the opening plane, and the sound radiated from the front and back of each horn The
sound pressure is offset and the directivity coefficient is almost O in the 90-degree direction,
since the phases are just opposite in phase and have almost the same amplitude. Further, because
of the directivity by the horn, there is an advantage that the area having a smaller directivity
coefficient is wider than the bi-directional speaker having the characteristic shown in FIG. 8 and
the listening area having a small direct sound level from the speaker device is expanded. FIG. 3 is
a plan view of the example of the layout of the speaker apparatus of the present embodiment
shown in correspondence with the conventional example of FIG. 9, as viewed from above the
listening room. In the figure, 3a is a speaker apparatus according to the present invention shown
in FIG. 1, which is an example arranged on both sides of the listener so that the 90 degree
direction of the speaker apparatus faces the listener. By arranging as shown in FIG. 3, almost no
direct sound is heard by the listener, and a good sound field reproduction effect can be obtained.
In addition, it is also possible to change directivity characteristics by giving an opening surface of
the cabinet and horn 2 in the embodiment not only parallel but also at a certain angle, and to
provide different sound field effects. Furthermore, the illustrated speaker unit may be of
diaphragm type, flat plate or the like, and the electric-acoustic conversion type 4 formula% as
described in detail according to the invention, according to the present invention, both front and
back of the speaker unit are identical By attaching a narrow-directional horn of a shape and
setting the opening face of the horn to be opposite, in a simple structure with one speaker unit,
the existence of the speaker is noticed by the direct radiation sound It is possible to realize a
speaker apparatus for reproducing a sound field that gives a natural sound field feeling.
[0002]
Brief description of the drawings
[0003]
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FIG. 1 is a cross-sectional view of a speaker device according to an embodiment of the present
invention, FIG. 2 is a directivity characteristic diagram showing an example of polar coordinate
directivity characteristics of the speaker device of FIG. In the layout example of the speaker
device according to the invention, a plan view seen from the top of the listening room, and FIG. 4
shows the layout example when the usual small speaker device is used for sound field
reproduction and the transmission path of the sound from above the listening room 5 is a plan
view of the layout example when the omnidirectional speaker device is used for sound field
reproduction and the transmission path of the sound from the top of the listening room, and FIG.
6 is a wall surface of the small speaker device Shows a layout example when used for
reproducing a sound field and a plan view of the sound transmission path seen from the top of
the listening room, FIG. 7 is a cross-sectional view of a conventional speaker apparatus having
both directivity, and FIG. Is the polar coordinate directivity characteristic of the loudspeaker
apparatus of FIG. 7 Figure directional characteristics showing an example in directivity factor,
FIG. 9 is a plan view showing an arrangement example when using the conventional speaker
device as sound field reproduction.
1 Speaker unit 2 Cabinet combined horn 3a Speaker device for sound field reproduction 4 Front
(main) speaker device 5 Listeners 6 Listening room Wall surface. Name of Agent Attorney
Attorney Shigetaka Kanno 1 Person Figure Fig. Tosos Beika No Y3 5--One Ear Round J5--11
Smisogeno L Waste Figure Figure
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