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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic device, and more particularly to an acoustic device in which a plurality of acoustic
umbrellas each having a room for generating a sound are disposed at one focus of an ellipsoid of
revolution having two focal points. . [Background Art] A speaker is generally used as a sound
device for transmitting voice in an enlarged manner, and is widely adopted. Among them, an
audio device such as a stereo provided with a plurality of speakers having different frequency
characteristics is also adopted. [In the invention, iug が 技術 ug で は 従 来 上述 従 来 音 声 音 声
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There is a problem that it becomes double noise or noise. The present invention has been made
in view of the above-described problems of the prior art, and an object thereof is to provide an
acoustic device capable of selecting a plurality of types of sounds in one space. [Means for
Solving the Problems] In the present invention, in order to achieve the above-mentioned object,
an acoustic umbrella with a speaker fixed as a sound source is separated by a predetermined
distance from one focus of an ellipsoid of revolution having two focuses. A structure in which a
plurality of ia were placed was adopted. [Operation] When the above-mentioned structure is
adopted, the sound generated from one focus has sharp directivity expanded toward the other
focus by each acoustic umbrella, and the attenuation factor of the sound is high. The sound from
the on-focus speaker is rapidly masked by the ambient sound as it leaves the other focus and can
not hear the sound of the other adjacent umbrellas. Therefore, even if a plurality of different
voices, for example, different languages, different music, and different explanations are sent from
each acoustic umbrella, only a specific voice can be heard by a person under the respective
acoustic umbrella. An independent acoustic space can be created under the acoustic umbrella.
Several embodiments of the present invention will be described with reference to the following
drawings. [Mll embodiment 1 Figure 1 illustrates the fourth embodiment which is the basis of the
present invention, and shows an example in which two acoustic umbrellas 1a and 1b are used.
These acoustic umbrellas have an ellipsoid of revolution with two foci, to which the speakers 2
are fixedly attached in each case. Different voices are supplied to these speakers 2 respectively.
The sound generated from the speaker 2 is reflected by the ellipsoid and emitted as a sound
wave 3 having a sharp directivity toward the other focal point. The user 4 who is in the range
where the sound wave 3 is present can hear the voice with the sound pressure level distribution
as shown under the respective acoustic umbrellas.
The curve shown by the solid line A is the sound pressure distribution of the acoustic umbrella
1a, and the curve shown by the dotted line B is the sound pressure level of the acoustic umbrella
1b. This example is measured at a quiet place. However, if the ambient sound (background noise)
is 60 dB, the distance between the two acoustic weights is 60 an, and the umbrella diameter is
90 all, the speakers with acoustic umbrellas 1 a and 1 lb When the sound pressure level is
greatly attenuated as shown in FIG. 1, the sound is masked by the ambient sound and the sound
of the sound umbrella 1a can not be heard under the sound umbrella 1b. . The reverse is also
true. That is, independent acoustic spaces are formed by the acoustic umbrellas 1a and 1b.
Specifically, in the example shown in FIG. 1, in the case of 1 ambient sound, that is, when the
background noise is 60 dB, a sound with a sound pressure of 60 dB + 10 dB = 70 dB or more can
not be heard in any acoustic vehicle from outside. The ambient sound of a typical place such as a
quiet exhibition is about 50 dB, and about 75 dB in noisy places, but in any case, if there is no
sound pressure of +10 dB or more, listen to the external sound in each acoustic vehicle I can not
do it. When the above-described structure is adopted, for example, in the case of an exhibition
hall, it can be used also for the explanation of adjacent panels with different contents or
languages. In addition, it is used as a special-purpose loud-speaker for announcements or
announcements intended for mild and moderate deaf people, or other public! It can also be used
as the sound W facility at the 2nd station. In addition, sound of section for deaf people in music
hall, lecture hall! It is also suitable as a facility. In addition, in a restaurant equipped with
karaoke, it can be used to expand a certain group to make a song, or to make an announcement
to a specific person. Furthermore, in the usual case, if the acoustic device is mounted above a
chair or seat as an unnecessary loudspeaker of the earphone, the voice can be heard only by the
user without causing any other inconvenience. In addition, as a method of use called release from
awkwardness for putting on the earphones for a long time, it is extremely practical to transmit an
audio at an international conference, a training apparatus, or the like. Second Embodiment FIG. 2
illustrates the second embodiment of the present invention. In this embodiment, the acoustic
devices la, lb, etc. are integrally constructed with the ceiling panel 5, and! An example is shown
as part of the II4 construction. Employing such m-structures can be applied extremely easily to
various structures such as restaurants and venues. [Effect] As apparent from the above
description, according to the present invention, a plurality of different sounds can be sent to a
specific place without confusion in one space.
Brief description of the drawings
FIG. 1 is a schematic configuration view for explaining a first embodiment of the present
invention, and fJi2 is a perspective view for explaining a second embodiment of the present
la, lb: sound umbrella, 2 ...: speaker 3 ... sound wave, 4 ... user, 5 ... panel. The first entrance
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