JPH01228295

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DESCRIPTION JPH01228295
[0001]
FIELD OF THE INVENTION The present invention relates to a speaker system for audio
reproduction. In the prior art, generally, a speaker system as shown in FIG. 6 or 8 is known. In
the first conventional example shown in FIG. 6, reference numeral 1 denotes a speaker unit, and
the speaker unit 1 is incorporated in the cabinet 2 with its main axis of radiation A facing
forward. Here, the radiation main axis is an axis extending forward of the speaker unit 1 in the
direction in which the main part of the sound wave emitted from the speaker unit l propagates.
The back of the speaker unit 1 is installed along the front wall 4 a of the room 4 so that the
sound wave from the speaker unit 1 can be transmitted directly to the listener L. In this case, the
sound pressure level received by the listener L is as shown in FIG. 7; the sound pressure level SPL
(d) of the direct sound (direct; two-propagating sound wave) is very large, and the reverberation
after that is rapid Is getting smaller. Further, in the second conventional example shown in FIG. 8,
one speaker unit 1a having the radiation main axis B directed forward is attached to the front
face of the cabinet 2, and both radiation main axes C and D are mounted on both sides of the
speaker unit 1a. Both side walls 4b, 4c towards Succa Unino) lb. IC is attached. Then, in this case,
the sound wave from the speaker unit 1a is directly propagated to the listener L, and the sound
wave from the IC) is reflected once by the side walls 4b and 4c and then propagated indirectly. It
has become. In this case, as shown in FIG. 9, the sound pressure level 5PL (d) of the direct sound
is very large, and the sound pressure level 5PL (indirectly propagating sound wave) of the
indirect sound is received by the listener L (R) is small. As specific examples of the speaker
system having the above configuration, those disclosed in Japanese Patent Application Laid-Open
No. 60-3297 and Japanese Utility Model Application Laid-Open No. 61-131193 are known.
SUMMARY OF THE INVENTION However, in the above-described conventional speaker system,
only the direct sound is reproduced in the first conventional example, so the sense of localization
and the sense of direction of the reproduced sound are strong, and the sense of spread of the
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sound is poor. There is a problem that the sound pressure distribution in the reproduced sound
field is difficult to become uniform. Also, in the first example, with indirect sound (two direct
sounds are also reproduced, the sense of localization and sense of direction of reproduced
sounds can not be reduced so much in the past that direct sound is inevitable as shown in FIG. 9)
In this case, the indirect sound can not be well-balanced, and there is a problem that the sense of
sound spread is poor and the sound pressure distribution in the reproduced sound field is
difficult to be uniform.
Furthermore, the need for a plurality of speaker units for direct sound and indirect sound, and
the structural complexity, etc. have the problems of high cost and lack of practicability. The
present invention is intended to solve the above-mentioned problems, and it is an object of the
present invention to provide a low-cost speaker system capable of reproducing an excellent
sound field. Means for Solving the Problems In order to achieve the above object, according to
the present invention, the radiation main axis of the speaker unit is directed to the ceiling
surface, the floor surface or both side walls, and the angle formed with the wall on which the
speaker unit is attached is 00 More than 45 °. By directing the radiation main axis of the action
speaker unit to the ceiling surface, floor surface or both side walls, the sound wave emitted from
the speaker unit is reflected by the ceiling surface, floor surface, etc., and becomes a reproduced
sound mainly composed of indirect sound, It can play excellent sound field range. In addition,
since an excellent reproduction sound is obtained at the mounting angle of the speaker unit, the
structure is simple and does not become expensive. The present invention will now be described
in detail with reference to the drawings. The first embodiment of the speaker system of the
present invention is as shown in FIGS. 1 and 2. FIG. The reference numeral 11 in the figure
indicates a speaker unit serving as a sound source, and the speaker unit 11 is incorporated in the
cabinet 12. The cabinet 12 is formed so that the side shape thereof is expanded upward in a bowl
shape, and the speaker unit 11 is incorporated upward on the upper surface 12a. The cabinet 12
is attached to the wall 13 a of the room 13. The angle θ between the radiation main axis E of the
speaker unit 11 and the wall surface 13a to which the cabinet 12 is attached is set to 0 ° or
more and 45 ° or less. In the speaker system configured as described above, the sound wave
radiated from the speaker unit 11 is reflected by the ceiling surface 14 and then spreads into the
room 13 to become reproduced sound mainly composed of indirect sound. As a result, as shown
in FIG. 3, the sound pressure level received by the listener in the room 13 is larger for the
indirect sound pressure level 5PL (r) than for the direct sound sound pressure level 5PL (d). . The
difference between the sound pressure level SPL (d) of the direct sound and the sound pressure
level 5PL (r) of the indirect sound can be specifically set to 3 dB or more by the setting of the
present invention. As a result, the sound waves radiated from the speaker unit 11 spread all over
the room 13, the sound pressure distribution becomes uniform, and the sound spread is
obtained, and the limited space can be felt widely.
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Furthermore, it is possible to create a particularly comfortable sound field space when canceling
the sound image by the direct sound, weakening the sense of localization of the sound and the
sense of direction, and playing back a pack ground me-sic or the like. Further, since the sound
pressure distribution in the reproduction sound field space can be made uniform, the change in
sound pressure due to the difference in the listening position is small, and it is possible to listen
comfortably in any position of the room 13 (two music can be heard. Furthermore, since the
speaker unit for direct sound is not used, cost can be reduced. Next, a second embodiment of the
present invention will be described. As shown in FIGS. 4 and 5, in this embodiment, a woofer unit
11a and two tweeters 11b disposed on both sides of the woofer unit 11a are provided as the
speaker unit 11. As in the case of the speaker unit 11 according to the first embodiment, the Turf
1 unit 11a is disposed with the radiation main @F at an angle of 00 ° to 45 ° with respect to
the wall surface 13a, and the two tweeters 1 are arranged. ] As in the case of the woofer unit
11a, the radiation main @F is disposed at a range of 00 to 45.degree. And inclined in the
direction of spreading on both sides of the woofer unit 11a. There is. As a result, the operation
and effects of the first embodiment can be achieved and, in particular, high-pitched sound can be
diffused more uniformly. In the first and second embodiments, the radiation main axes E and F of
the speaker unit 11 are disposed to face the ceiling surface 14, but the present invention is not
limited to this, and the floor surface or the cavity node 12 may be used. Even if it arrange ¦
positions toward the both-sides wall with respect to the wall surface 13a to which is attached, a
front, distribution-like effect ¦ action, and an effect can be show ¦ played. Effects of the Invention
As described above, according to the speaker system of the present invention, the following
effects are obtained. (1) Since the reproduced sound is mainly indirect sound, the sound wave
radiated from the speaker unit spreads over the whole room, the sound pressure distribution
becomes uniform and the sound spread is obtained, and the limited space is widely When it can
be made to feel, it is possible to create a comfortable sound space space. (2) Since the sound
pressure distribution in the reproduction sound field space can be made uniform, the change in
sound pressure due to the difference in listening position is reduced, and music can be
comfortably heard at any position in the room. (3) Since a speaker unit for direct sound is not
used, cost can be reduced.
[0002]
Brief description of the drawings
[0003]
1 is a front view showing a first embodiment of the speaker system of the present invention, FIG.
2 is a side sectional view of the speaker system of FIG. 1, and FIG. 3 is a listener in a room
equipped with the speaker system of FIG. 4 is a front view showing a second embodiment of the
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speaker system of the present invention, FIG. 5 is a side sectional view of the speaker system of
FIG. 4, FIG. Fig. 7 is a schematic plan view showing a speaker system as a first prior art example,
Fig. 7 is a graph showing temporal changes in sound pressure level heard by a listener in a room
equipped with the speaker system of Fig. 6, Fig. 8 is Fig. 2 FIG. 9 is a schematic plan view
showing a speaker system as a conventional example, and FIG. 9 is a graph showing temporal
changes in sound pressure levels heard by a listener in a room equipped with the speaker system
of FIG.
11, lla, IN), 1lc- "speaker unit, 12 cabinets, 13 ... room, 13a ... wall surface, 14 ... ceiling surface.
Name of the agent Attorney Nakao Toshio 1 person Figure 2 Oyodo Den Figure 3 Figure 4 Figure
5 Figure 6 Figure 7 Time Figure 8
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