JP2017225358A - Acoustic device using ultrasonic wave - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an acoustic device that can impart movement feeling and three-dimensional feeling to sound of threatening sound to harmful beasts, guiding sound to useful animals, acoustic projection and the like.SOLUTION: An acoustic device using an ultrasonic wave includes a plurality of ultrasonic speakers having modulation means using audio frequency.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an acoustic device having high directivity using ultrasonic waves, and particularly relates to sound transmission with high directivity.

Damages to crops caused by wild animals such as spiders, monkeys, and deers, and scattering of garbage caused by crows have become major problems.
Therefore, for example, Patent Document 1 discloses a beast damage countermeasure device provided with sound generation means including a threatening stay sound of a person or a dog who fears a harmful beast, a threatening approaching sound.
However, the sound generating means disclosed in this publication is generated in a wide range regardless of whether or not harmful beasts are approaching. There are problems that harm the environment.
Patent Document 2 discloses a technology for controlling the generation of sound by providing an animal sensor that detects harmful beasts.
However, the problem of hearing sound in a wide range has not been solved.

Japanese Patent No. 5828191 JP 2012-110269 A

  An object of the present invention is to provide an acoustic device capable of imparting a sense of movement and a three-dimensional effect to sound in threatening sounds to harmful animals, guidance sounds to useful animals, acoustic projections, and the like.

  The acoustic device according to the present invention includes a plurality of ultrasonic speakers each having a modulation means based on a voice frequency.

  Here, the ultrasonic speaker is preferably configured in a parametric array in which a plurality of ultrasonic oscillators are arranged in a plane.

Ultrasonic waves have high directivity, and when arranged in a parametric array, large sound pressure and directivity are further increased.
When this is modulated by the sound frequency, sound can be heard in a very narrow range, and when reflected on an object, sound can be heard from the reflecting surface.
In the present invention, when a plurality of the ultrasonic speakers are arranged, sound can be heard from a plurality of positions, and the sound source can be heard as moved.
In addition, sound having high directivity can be heard from this speaker even at a position several tens of meters away from the ultrasonic speaker.

For example, when a wolf barking voice is transmitted from a plurality of ultrasonic speakers for the purpose of fighting off a frog, it sounds like the wolf is moving.
This provides a repelling device for wild harmful birds and beasts that can effectively repel many harmful animals and harmful birds such as crows.
Moreover, it becomes the action management apparatus of a useful animal which guides the movement of the grazing livestock and notifies that there is a fence nearby.
Furthermore, when the ultrasonic speaker according to the present invention is arranged toward the guide plate or the display boat, only the person approaching there will be a movement guide device that can hear the sound by reflection.
Further, when a plurality of ultrasonic speakers are arranged on the left and right and top and bottom so as to irradiate on the screen or the like, a three-dimensional acoustic device in which a plurality of sounds by a plurality of reflections are synthesized.

The ultrasonic wave used in the present invention has a frequency of 20 kHz or more, and ultrasonic oscillators with a frequency of 28 kHz, 40 kHz, or 60 kHz are commercially available.
In the present invention, the sound to be modulated is preferably a low frequency of about 400 Hz to 5 kHz.

  In the present invention, since a plurality of ultrasonic speakers with high directivity are arranged, modulated ultrasonic waves with good linearity can be heard as sound when reflected by buildings, trees, guide boards, screens, etc. It will sound as if the sound source has moved from the deviation of the irradiation position.

Thus, for example, when a voice that a wolf can hear to repel a spear is transmitted from a plurality of ultrasonic speakers, it sounds as if the wolf has moved.
As a result, unlike a conventional case where a constant sound flows, the threatening effect on the trap is great.

  The present invention is characterized in that a plurality of ultrasonic speakers are arranged, so that the position of the sound generated by each ultrasonic speaker sounds as if it has been moved by a plurality of irradiations. There is a usage method.

The structural example of the audio equipment which concerns on this invention which has arrange | positioned two ultrasonic speakers is shown. An example in which ultrasonic oscillators are arranged in a parametric array is shown. The example which applied the acoustic apparatus which concerns on this invention to the guidance guide plate is shown. An example applied to the induction of grazed cattle. An example applied to a grazing fence.

Based on FIG. 1, the structural example of the audio equipment based on this invention is demonstrated.
FIG. 1 shows an example in which the ultrasonic speakers A and B2 are slightly separated in the left-right direction, but the number of ultrasonic speakers is not limited.
Further, if the irradiation direction of each ultrasonic speaker can be adjusted, it is not always necessary to install the respective speakers in close proximity.

As an ultrasonic speaker, as shown in FIG. 2, it was comprised in the parametric array which has arrange | positioned 40-100 ultrasonic oscillators planarly.
An oscillation frequency of 40 kHz was used.
Further, AM modulation, FM modulation, or the like can be used for modulation, but FM modulation is used in this embodiment.
Also, monaural was used for voice input.

In FIG. 1, when the modulated ultrasonic wave 11 irradiated from the ultrasonic speaker A is reflected by, for example, a building or a tree, a reflected wave 12 is generated so that sound can be heard from the reflecting surface 1.
Similarly, a modulated ultrasonic wave 21 and a reflected wave 22 are generated from the ultrasonic speaker B.
This reflected wave 22 is transmitted so that sound can be similarly heard from the reflecting surface 1.
This voice has a strong directivity. For example, when the moth 2 approaches the reflected wave, it can be heard as, for example, a voice that a wolf sings.
In addition, although it can be heard directly as the sound from the ultrasonic speakers A and B if it falls within the directivity region of the modulated ultrasonic waves 11 and 21, the use of the reflected wave is effective in repelling harmful birds and beasts.

  Such a method of repelling harmful birds and beasts is also effective in the field where crows and the like fish collected garbage bags, and in the prevention of rats in the attic.

  Moreover, when it irradiates from the left and right, upper and lower ultrasonic speakers toward the projection screen or the mapping, a three-dimensional sound system in which a plurality of sounds are synthesized is obtained.

FIG. 3 shows an example in which the acoustic device according to the present invention is applied to, for example, a zoo guide plate 3.
For example, the direction of the breeding ground for hippopotamus is shown on the guide board 3, and the person who approaches this can hear the bark's cry by the reflected waves 12 and 22 emitted from the ultrasonic speakers A and B. It can also be heard to move.

In FIG. 4, an ultrasonic speaker A is attached to the hill 4, and the cow's voice in the pasture of the cow and the cry of the sheepdog in the pasture of the sheep are uttered with high directivity, thereby controlling the irradiation direction of the ultrasonic speaker. And can induce the movement of sheep.
Also in this case, it is more effective to combine a plurality of ultrasonic speakers than to use only one ultrasonic speaker.

  FIG. 4 shows that the ultrasonic speakers A, B,... It is also effective for management.

Claims (3)

  An acoustic apparatus comprising a plurality of ultrasonic speakers each having a modulation means based on an audio frequency.   2. The acoustic apparatus according to claim 1, wherein the ultrasonic speaker is configured as a parametric array in which a plurality of ultrasonic oscillators are arranged in a plane.   The acoustic device according to claim 1, wherein the acoustic device is any one of a wild harmful birds and beasts repelling device, a useful animal behavior management device, a movement guide device, and a three-dimensional acoustic device.

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