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JPS6354899

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DESCRIPTION JPS6354899
[0001]
[Industrial Field of Application] The present invention relates to a so-called sound field creation
speaker system which reproduces a sense of sound expansion and realism in a theater or hall /
EE, performance, etc. [Summary of the Invention] A speaker for direct sound that generates a
sound wave that directly reaches a listener (listener), and a speaker for indirect sound that
generates a sound wave that indirectly reaches a listener by reflecting on a wall surface or the
like In the provided speaker system, the direct sound speaker and the indirect sound are
provided by providing the indirect sound speaker with single directivity and arranging the
indirect sound speaker in a predetermined direction with respect to the direct sound speaker.
The speaker and the speaker are integrated in the same cabinet and integrated to enable the
reproduction of a sound field that is sufficiently realistic to be able to be performed under the f
state. [Prior Art] A speaker for direct sound, which produces sound waves that reach the listener
directly, and an speaker for indirect sound, which generates sound waves that reach the listener
indirectly by, for example, reflecting on the wall, are provided. A sense of expansion to the sound
by the direct sound (preceding sound) component that reaches the listener directly from the
direct sound speaker and the indirect sound (delayed reflection sound) component that reaches
the listener by wall reflection from the indirect sound speaker Loudspeaker systems that are
realistic are well known in the art. In this speaker system, the feeling of expansion and presence
in a hall or a theater etc. is felt in addition to the direct sound (preceding sound) component that
reaches the listener's ear directly from the sound source. It arrives from a different direction (in
particular, the horizontal direction), (2) has an appropriate delay time (for example, 10 to 3011
seC) compared to the direct sound component, and (3) has an appropriate level relationship
compared to the direct sound component, Focusing on the fact that the indirect sound (reflected
sound) component that satisfies the three conditions is obtained by reaching the listener's ear
and satisfying the so-called spatial perception effect of human beings, the direct sound speaker
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directly While making a sound, an indirect sound (delayed reflection sound) is actively made by a
speaker for indirect sound, and the direct sound and the indirect sound are intended to
reproduce a realistic sound field. [Problem to be Solved by the Invention 1] The above-mentioned
conventional speaker system has the following problems because the indirect sound speaker is
not made unidirectional. (1) As shown in FIG. 7, when the indirect sound speaker 2 is brought
close to the direct sound speaker 1, the position of the sound source almost matches, and the
space perception effect to bring about the aforementioned presence feeling can not be obtained.
In particular, in order to generate a sound wave arriving from a direction (in particular, the
horizontal direction) different from the direct sound component described in (1) of the prior art J,
the indirect sound speaker 2 can be used as the direct sound speaker 1 Need to be installed,
which requires a large installation space.
(2) There is a system called a sound field type speaker system in which a direct sound speaker
and an indirect sound speaker are incorporated in the same cabinet, but also in this case, the
height of the indirect sound speaker itself is very limited. In the region, directivity is obtained,
but in the middle and low regions, so-called non-directionality is not obtained. The present
invention is made for the purpose of solving the above-mentioned conventional problems.
[Means for Solving the Problems] In a speaker system provided with a direct sound speaker for
generating a sound wave directly reaching a listener and an indirect sound speaker for
generating a sound wave indirectly reaching a listener The indirect sound speaker is provided
with unidirectionality, and the sound wave emission axis direction of the indirect sound speaker
is disposed within a range of 180 ° ± 90 ° with respect to the sound wave emission axis
direction of the direct sound speaker. [Operation] The indirect sound speaker has a single
directivity, and almost all of the sound wave (acoustic power) output from the speaker is emitted
to the front side, and no sound wave is emitted to the back side. Therefore, even when the
indirect sound speaker is brought close to the direct sound speaker, it is possible to obtain a
space perception effect that brings a sense of presence. In addition, since the indirect sound
speaker is provided with single directivity over a wide band so as not to be nondirectional in the
middle or low range, it is possible to reproduce a sound field rich in presence even in these low
and middle ranges. Next, the speaker system of the present invention will be described with
reference to FIGS. In the figure, 11 is a speaker system, and 12 and 13 are a direct sound speaker
and an indirect sound speaker constituting the speaker system 11. The r @@ direct sound
speaker 12 is formed by mounting a direct radiation flat plate speaker 12 b and a tweeter 12 c
on the front surface (a baffle surface) of the cabinet 12 a. Further, the indirect sound speaker 13
has the center of the bubble plate 13a such that the ratio (s / ρ8) of the shortest distance 88 to
the center and the longest distance is Qg / (15 ≦, # (a, 2 ≧ f23) A direct radiation flat plate
speaker 13 b (in this case, a speaker unit) is disposed at the center of the equivalent sound
source. In this embodiment, the baffle plate 13a has a circular shape, so that Q / Q8 = 1. The
back surface side of the flat loudspeaker 13b is covered with a sound absorbing material 13c of a
workshop as shown in FIG. Accordingly, the sound wave from the flat loudspeaker 13b is directly
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radiated to the front surface (upper left in FIG. 2) but is largely attenuated by the sound
absorbing material 13c at the rear surface (lower right in FIG. 2). By changing the ratio of the
acoustic power before and after the baffle plate Ha, the so-called cardioid characteristic is
configured as a uni-directional speaker realized over a wide band, specifically, middle to low
band (about 500 [(z) There is.
The indirect sound speaker 13 is rotatably mounted above the direct sound speaker 12 by a
pivot shaft 14 which doubles as a stand erected at the center of the upper surface of the cabinet
12 a of the direct sound speaker 12. Since the indirect sound speaker 13 is separated from the
direct sound speaker 12 by the rotation M14, the adverse effect of the sound wave generated
from the indirect sound speaker 13 from the top surface of the cabinet 12a is minimized. The
sound wave emission axis direction of the indirect sound speaker 13 is disposed in the range of
1806 ± 90 ° with respect to the sound wave emission axis direction of the direct sound
speaker I2. Then, as shown in FIG. 3, a signal is input to the direct sound speaker 12 via the
amplifier 15 and to the indirect sound speaker 13 via the amplifier 16 and the delay unit 17. The
speaker system 11 according to the embodiment has the above-described configuration, and as
shown in FIG. 4, the speaker system 11 is disposed symmetrically in the listening room, and the
sound emission of the direct sound speaker 12 is achieved. The axial direction is directed to the
front, and the sound wave emission axis direction of the indirect sound speaker 13 having
directivity is disposed at a predetermined angle K (180 ° = 90 °) with respect to the sound
wave emission axis direction of the direct sound speaker 12 When a signal having an appropriate
delay time and level relationship with the direct sound component is input to the indirect sound
speaker 3, the sound wave emitted from the speaker 13 is reflected by the back wall and the side
wall to reach the listener. , Squirrel-It is perceived that the source of the reflected sound
component is also on the wall side. In addition to the direct sound (preceding sound) component
that directly reaches the listener's ear from the direct sound speaker 12, (1) arrives from a
direction (especially horizontal direction) different from the direct sound component, and (2)
direct An indirect sound (reflected sound) component over a wide band satisfying the above
three conditions, which has an appropriate delay time (for example, 10 to 30 zsec) as compared
to the sound component and has an appropriate level relationship as compared with the direct
sound component By satisfying the so-called spatial perception effect of human beings by
reaching the listener's ears, it is possible to obtain a sense of sound spreading and presence in a
hall or a theater. Although FIG. 3 shows the case where the speaker system 11 is configured by
integrating the direct sound speaker I2 and the indirect sound speaker 13, as shown in FIG. 5,
the direct sound speaker 12 and the indirect sound speaker 12 are used. Even if the speaker 13
and the respective amplifiers 15.16 are integrated to constitute the speaker system 11, or as
shown in FIG. 6, the direct sound speaker 129 and the indirect sound speaker 13.B.
Not only the amplifier 15.16 but also the delay device 17 may be integrated to form the speaker
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system 11. The delay device 17 is necessary when the speaker must be installed at a position
close to the wall, but can be omitted when the speaker can be installed at a position sufficiently
separated from the wall. [Effects of the Invention] As described above, the present invention is
directed to a direct sound speaker that generates an acoustic wave that reaches the listener
directly, and an indirect sound that generates an acoustic wave that indirectly reaches the
listener by, for example, wall reflection. In the speaker system provided with the speaker for the
indirect sound, the indirect sound speaker has single directivity, and the sound wave emission
axis direction of the indirect sound speaker with respect to the sound wave emission axis
direction of the direct sound speaker Because the front and back sides of the indirect sound
speaker have a large difference in output sound pressure, the direct sound speaker is brought
close to the direct sound speaker. Even with the arrangement, the sound source of the reflected
sound component seems to be on the wall surface, and the condition that the indirect sound
comes from an angle different from that of the direct sound can be satisfied in order to generate
space perception. There is an effect that a sufficient sense of reality can be obtained without
taking a large installation space. Moreover, it should be noted that the speaker unit itself does
not have directivity as an indirect sound speaker, and a non-directional speaker unit is used, and
it is used by a sound absorbing material or the like. The characteristic is obtained over a wide
band by changing the acoustic power of to obtain a single directivity, so that the effect of
sufficiently providing presence in a wide band without taking a wide installation space as
described above is obtained. Is obtained.
[0002]
Brief description of the drawings
[0003]
1 is a perspective view of the speaker system according to the present invention, FIG. 2 is a plan
view, FIG. 3 is a block diagram of a speaker system circuit, and FIG. 4 is a plan view of a use
condition, FIG. 5 and FIG. FIG. 7 is a block diagram of another embodiment of the speaker system,
and FIG. 7 is a plan view of a use condition of the conventional speaker system.
11: speaker system 12: speaker for direct sound 13: speaker for indirect sound 13a: baffle plate
13b: speaker 13c: adsorbent. Fig. 1 Fig. 3 Fig. 6 "γ
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