JP2005223853

Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2005223853
PROBLEM TO BE SOLVED: To obtain an acoustic device in which a spectator who needs an
explanation can hear an explanation while feeling the original atmosphere such as Noh and
Kabuki. SOLUTION: In an acoustic device 10 installed in a venue having a spectator seat
consisting of a plurality of seats, a modulator 12 for modulating a carrier wave of an ultrasonic
band by an audible sound signal and a part of seats in the spectator seat For the sound wave
arrival area, the modulated signal from the modulator 12 is emitted as a superdirective sound
wave, and the radiator 14 for transmitting an audible sound only to the seat via the
superdirective sound wave is provided. [Selected figure] Figure 1
Sound equipment
[0001]
The present invention relates to an acoustic device installed in a venue such as Noh-Kabuki,
which has a superdirective speaker for directional emission of audible sound and has a spectator
seat composed of a plurality of seats.
[0002]
In theaters such as Noh and Kabuki, it is often difficult for a beginner to understand, since
modern languages are not used in the lines, and it is difficult to enjoy the theater.
So, now, we lend earbuds, headphones, etc. to spectators who require commentary such as
03-05-2019
1
beginners and help understanding by streaming commentaries. The reason for using ear phones,
headphones, etc. is to prevent voice from flowing through the entire venue and destroying the
atmosphere of the venue.
[0003]
JP 2000-5454 A
[0004]
Therefore, beginners etc. will hear the commentary using the ear phone etc. If it is wearing the
ear phone etc, it is difficult to feel the original atmosphere of Noh, Kabuki etc. and it is unsanitary
There were issues such as
[0005]
The present invention has been made to solve the above-described problems, and it is an object
of the present invention to obtain an audio device that allows an audience who needs an
explanation to hear the explanation while feeling the original atmosphere of Noh and Kabuki etc.
To aim.
[0006]
The acoustic device according to the present invention comprises a modulator that modulates a
carrier wave of an ultrasonic band by an audible sound signal, and a modulation signal from a
modulator for a sound wave arrival area set in a part of a seat of a spectator seat. It emits as a
directional sound wave, and comprises an emitter for transmitting an audible sound only to the
seat via a superdirective sound wave.
[0007]
According to the present invention, the acoustic device is installed in a venue having a spectator
seat consisting of a plurality of seats, the modulator for modulating the carrier wave of the
ultrasonic band by an audible sound signal, and a part of the spectator seat A radiator for
emitting an modulated sound from the modulator as a superdirective sound wave and
transmitting an audible sound only to the seat through the superdirective sound wave is provided
to a sound wave arrival region set in the seat. Since it was configured as described above, the
Noh-Kabuki venue where the voices such as the commentary could not be expanded in the venue
conventionally due to problems such as disrupting the atmosphere of the entire venue or causing
inconvenience to other spectators In the above, there is an effect that it is possible to spread the
voice such as the commentary only to a part of the audience who needs the commentary such as
03-05-2019
2
beginners.
[0008]
Embodiment 1
FIG. 1 is a block diagram of an acoustic device according to a first embodiment of the present
invention.
As shown in the figure, the acoustic device 10 comprises a sound source 11, a modulator 12, an
amplifier 13 and a radiator 14.
[0009]
The sound source 11 generates an audible sound signal.
The modulator 12 modulates the carrier wave belonging to the ultrasonic band with the audible
sound signal from the sound source 11.
The amplifier 13 amplifies the modulation signal output from the modulator 12.
The radiator 14 radiates the ultrasonic signal output from the amplifier 13 into the air as a
superdirectional sound wave. The acoustic device 10 applies the principle of a parametric
speaker that converts an audible sound into a highly linear ultrasonic wave (inaudible sound) and
emits it in a targeted direction. When a parametric speaker is used, the emitted sound travels
straight with about 20 degrees spread.
[0010]
Here, the basic principle of the parametric speaker will be described. The parametric speaker
03-05-2019
3
adopts the principle of obtaining sound in the audible range by using a distortion component
generated in the process of propagating air, in which a powerful ultrasonic wave having a
frequency higher than that of an audible sound. FIG. 2 is a diagram for explaining the principle of
the parametric speaker. In FIG. 2, two frequency components f1 and f2, and their difference
components f2-f1 and sum components f2 + f1 are shown. The parametric speaker utilizes the
relationship between two frequency components f1 and f2 and their difference components f2f1. An audible sound can be obtained by setting the two frequency components f1 and f2 to be in
the ultrasonic band which can not be heard by humans and the difference components f2-f1 to
be in the audio band. The interaction of ultrasonic waves utilizes the non-linearity of air that
strong ultrasonic waves become distorted in the propagation process.
[0011]
The modulator 12 has a function of producing two ultrasonic components corresponding to the
above-mentioned audible sound signal. That is, the modulator 12 generates a carrier signal
component and a signal having sidebands. The carrier signal component and the sideband
constitute two frequency components. The modulation method uses, for example, an amplitude
modulation method.
[0012]
FIG. 3 is a view showing an example of use of the acoustic device 10 according to the first
embodiment of the present invention. FIG. 3 shows that the acoustic device 10 is installed at a
performance venue for Noh and Kabuki and the like. In the Noh and Kabuki venues, stage 2,
flower path 3, spectator seat 4 and the like exist. The flower path 3 is arranged, for example, to
cross the center of a spectator seat 4 composed of a plurality of seats. In such a venue, the
radiator 14 of the acoustic device 10 according to the present invention is installed on the ceiling
of the stage 2, and the radiator 14 is adjusted to face the audience seat 4. The sound source 11,
the modulator 12, and the amplifier 13 may be disposed on the ceiling together with the radiator
14, or may be disposed on a sleeve of the stage 2 or the like.
[0013]
Next, the operation will be described. The sound source 11 generates an audible sound signal in
response to an instruction from the operator or an external command, and supplies the audible
03-05-2019
4
sound signal to the modulator 12. The modulator 12 modulates the carrier wave belonging to the
ultrasonic band with the acquired audible sound signal and supplies it to the amplifier 13. The
amplifier 13 amplifies the modulated signal acquired from the modulator 12 and supplies the
amplified signal to the radiator 14. The radiator 14 radiates the ultrasonic signal output from the
amplifier 13 into the air as a superdirectional sound wave. The sound wave emitted from the
radiator 14 is self-demodulated to become an audible sound by the non-linear parametric
phenomenon of air. Since the modulation signal is an ultrasonic wave, the sound signal
reproduced in the air can also have strong directivity. Therefore, it is possible to realize an
environment in which the sound reaches only the audience who needs the commentary and the
sound is not amplified in the entire hall.
[0014]
The modulated signal emitted by each radiator 14 is amplified with a spread of about 20 degrees
in air. The user of the acoustic device 10 may set an arrival area of the sound wave on a part of
the seats 4 of the spectator seat 4 and install a plurality of radiators 14 so that the audible sound
reaches only the arrival area. This makes it possible to uniformly spread the sound only within
the required range of the audience seat 4.
[0015]
FIG. 4 is a diagram for explaining the reflection direction of the modulation signal emitted from
the radiator 14. Parametric speakers use highly directional ultrasound waves, so they may be
affected by reflections, and the reflected sound may reach an unexpected place. Therefore, the
angle of the radiator 14 is adjusted and installed so that the primary reflected wave of the superoriented sound wave emitted from the radiator 14 reaches the wall 5 of the hall. A sound
absorbing material is applied to the wall 5 and the ceiling of the venue. In FIG. 4, the angle of the
radiator 14 is adjusted and installed so that the sound wave is emitted toward the audience seat
4B closer to the wall 5 than the flower path 3. In this case, since the primary reflection of the
sound wave from the radiator 14 is absorbed by the wall 5 or the ceiling surface, the generation
of the reflection can be prevented. Therefore, it is possible to create an environment in which the
sound is not transmitted to other audiences. In addition, it is necessary to adjust the installation
angle of the radiator 14 according to the structure of the hall.
[0016]
As described above, according to the first embodiment, by installing the acoustic device 10 to
03-05-2019
5
which the principle of the parametric speaker is applied at a venue where the performance of
Noh and Kabuki is performed, the voice such as the commentary can be expanded. There is no
need for a beginner to wear headphones, etc., and the effect of being able to hear and comment
on the commentary while experiencing the atmosphere of the whole venue is obtained.
[0017]
Also, since the angle of the radiator 14 is adjusted so that the primary reflected wave of the
superdirective sound wave from the radiator 14 of the acoustic device 10 reaches the wall 5, a
sound absorbing material is attached to the wall 5 or the ceiling surface. By applying it, the
reflected sound can be absorbed, and a uniform sound field can be formed only in a part of the
audience in the hall.
Therefore, it is possible to provide an environment capable of realizing an audio broadcast that
meets the needs of the audience, such as a foreign language broadcast as well as a commentary
for beginners.
[0018]
The sound device 10 may be provided with an antenna and a receiver instead of the sound
source 11, and may receive audio information transmitted from a control room or the like in the
hall and supply the information to the modulator 12.
[0019]
1 is a block diagram of an acoustic device according to Embodiment 1 of the present invention.
It is a figure explaining the principle of a parametric speaker. It is a figure which shows the usage
example of the acoustic apparatus by Embodiment 1 of this invention. It is a figure explaining the
reflection direction of the modulation signal radiated ¦ emitted from the radiator which concerns
on the Embodiment 1. FIG.
Explanation of sign
03-05-2019
6
[0020]
2 stage, 3 flower path, 4, 4A, 4B audience seat, 5 walls, 10 sound devices, 11 sound sources, 12
modulators, 13 amplifiers, 14 radiators.
03-05-2019
7