JPH08130787A - Outdoor microphone device - Google Patents

Abstract

PURPOSE: To eliminate a fault by a bird and to stably perform sound measurement extending over a long period without impairing acoustic characteristic by providing a static magnetic flux generating means which changes terrestrial magnetism in a space in the periphery of a microphone. CONSTITUTION: A windbreak screen 4 is equipped with water resistance cloth 5 to evade rain and an inner frame 6 to support the cloth in its inside. The inner frame 6 forms a frame consisting of a reverse U-shape piano wire erecting over a ring shape base 7, and constituted by fixing a group of frames by an intermediate member (static magnetic flux generating means) 8 formed in a ring shape permanent magnet, and mounted on a base part by covering the microphone 2. The ring shape permanent magnet 8 forms magnetic fields in a vertical direction in the periphery of the screen 4 in the case that the upper and lower terminal parts of a wheel are set as magnetic poles, and also, forms the magnetic field around a horizontal axial line traversing the screen 4 in the case that both terminals of one diameter of the ring are set as the magnetic poles, and the partial turbulence of the terrestrial magnetism is generated by such magnetic field. Therefore, the approach of the bird to this outdoor microphone device can be prevented from occurring since the bird dislikes the turbulence of the terrestrial magnetism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outdoor microphone device for outdoor acoustic measurement, and more particularly to an outdoor microphone device which eliminates obstacles caused by birds and enables stable acoustic measurement for a long period of time.

[0002]

2. Description of the Related Art An outdoor microphone device is used to measure environmental noise caused by road traffic or aircraft.
In addition to the microphone, this outdoor-installed microphone device is composed of a windproof screen that is mounted so as to cover the microphone and a support means that supports the microphone, and is installed outdoors to perform long-term acoustic measurement. The windscreen is generally a spherical sponge made of open-cell urethane foam to prevent noise and wind noise caused by wind pressure acting on the microphone, and to avoid rain and to ensure predetermined acoustic characteristics. Often formed.

Further, since the outdoor microphone device is installed upright on the ground or the like where no one can enter, birds gather as a perch and start to make its feather noises and squeals and peck with a beak. The damage of the will hinder the acoustic measurement. In particular, when the windscreen is damaged, not only the function of the windscreen, that is, the function of preventing noise and wind noise due to wind pressure, is deteriorated, but also rain etc. is applied to the microphone, and the microphone is irreversibly damaged due to its mechanism. This will cause damage to even expensive microphones. In order to prevent such damage from birds, various bird avoidance measures such as covering the microphone device with a bag or a wire net, providing needles to prevent the birds from being caught, or applying repellents are taken. Has been.

[0004]

However, when the microphone device is covered with a bag or a wire net, the acoustic characteristics of the microphone device are changed, and on the contrary, it causes wind noise and raindrop noise, which lowers the measurement accuracy and reduces maintenance. It will hinder the inspection, and even if a needle-like body is provided, it will not be effective if the birds make a feather noise due to the approach of birds or if birds gather in the vicinity, and it is necessary to reapply the repellent regularly. It is difficult to secure long-term measurement accuracy.

An object of the present invention is to obtain an outdoor microphone device which eliminates obstacles due to birds and enables stable acoustic measurement for a long period of time without impairing acoustic characteristics.

[0006]

In order to solve the above problems, there is provided an outdoor microphone device comprising a microphone for detecting sound and a supporting means for fixing the microphone in an outdoor space, the space surrounding the microphone. It was equipped with static magnetic flux generating means for changing the earth's magnetism.

It is preferable that the microphone is provided with a windproof screen, and the static magnetic flux generating means is provided in the windproof screen, and the supporting means is provided with a support for the microphone, and the support is formed on the support made of a non-magnetic material. It is preferable to additionally provide a static magnetic flux generating means, and it is preferable that the supporting means is provided with a supporting base for fixing to a place of installation, and at least the supporting magnetic base is provided at or around the supporting base. . Furthermore, in an outdoor microphone device fixed to the upper end of the column, a microphone that detects sound, an inner frame that surrounds the microphone and is fixed to the column, and a windproof screen that is provided to cover the inner frame. A part or all of the pillar and the inner frame is composed of static magnetic flux generating means.

[0008]

Since the static magnetic flux generating means provided in the outdoor microphone device changes the geomagnetism in the space around the microphone, birds are prevented from approaching the microphone dislike the disturbance of the geomagnetic field and therefore stable for a long period of time. It is possible to make outdoor acoustic measurements.

When the static magnetic flux generating means is attached to the support and when the static magnetic flux generating means is provided on or around the support base of the supporting means, the space for arranging the large magnet can be easily secured. It is possible to obtain a strong magnetic field.

Further, an outdoor microphone which is fixed to the upper end of the column and which detects a sound, an inner frame which surrounds the microphone and is fixed to the column, and a windproof screen which covers the inner frame. In the device,
When part or all of the pillar and the inner frame are configured to generate static magnetic flux, there is no change in the external shape as compared with the conventional windscreen, and therefore, the acoustic characteristics are not impaired, which is convenient. .

[0011]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view of a windproof screen of an outdoor microphone device according to a first embodiment of the present invention, and FIG. 2 is a perspective view of an inner frame of the windproof screen.

The outdoor microphone device 1 comprises a microphone 2 for detecting sound and a supporting means 3 for fixing the microphone 2. The microphone 2 is provided with a windproof screen 4.

The windscreen 4 is a microphone 2
In order to prevent noise and wind noise from acting on the wind and to ensure the specified acoustic characteristics, a spherical sponge made of open-cell urethane foam is used, inside of which a waterproof cloth 5 is provided to prevent rain. , And the inner frame 6 that supports these
Is provided. The inner frame 6 forms a frame composed of an inverted U-shaped piano wire standing upright from the ring-shaped base 7 of FIG. 2, and is constituted by fixing a group of bones by an intermediate member 8 which forms a ring-shaped permanent magnet. , Cover the microphone 2 and attach it to its base. The inner frame 6 is attached to the support means 3 via the base 7. The material of the windscreen 4 is not limited to the above-mentioned materials, and for example, nonwoven fabric may be used.

The ring-shaped permanent magnet forms a vertical magnetic field around the windscreen 4 when the upper and lower ends of the ring are magnetic poles, and both ends of one diameter of the ring are magnetic poles. In this case, a magnetic field is formed around a horizontal axis that crosses the windscreen 4, and this magnetic field causes a partial disturbance of the geomagnetism. Therefore, the bird dislikes the disturbance of the geomagnetism and does not approach the outdoor microphone device. This means that in order to remove nails, etc. that are mixed in the animal feed in the zoo, the birds do not lean on the animal shed that has a magnet in the feeding box, and the animals stick their skin on the birds and the hair is cut. It is based on the fact that it is effective in preventing the damage caused.

Further, the intermediate member, which is a part of the inner frame of the windscreen, is made of a permanent magnet and is used as the magnetic flux generating means, so that birds can be prevented from leaning against each other. In this case, there is no change in the external shape as compared with the conventional windshield, and therefore the acoustic characteristics are not impaired.
Since the magnetic flux generated by the permanent magnet is static, it does not affect the diaphragm inside the microphone, that is, it does not affect the characteristics of the microphone.

FIG. 3 is a partially cutaway perspective view of a windproof screen of an outdoor microphone device according to a modification. The outdoor microphone device 14 is divided into a collar portion 15a of a base 15 made of a non-magnetic material of the windshield 4 and a plurality of permanent magnets 16 are embedded in the magnetizing directions in a uniform manner. Creates a magnetic field around the.

FIG. 4 is a cross-sectional view of a windshield according to a modified example. The outdoor microphone device 9 shown in FIG. 4A has a ring-shaped magnet 11 in the middle portion of the inner frame 10 of the windshield 4. , And the outdoor microphone device 12 shown in FIG. 2B is also provided with a bar-shaped magnet 13.
Needless to say, these magnets are selected to have a size that does not interfere with the sound that enters the microphone from the outside. In the outdoor microphone devices 9 and 12, the magnets 11 and 13 are simply added to the windshield screen, so that a simple work of incorporating the magnets into the existing outdoor microphone device prevents birds from approaching. A microphone device installed outdoors can be realized.

In the above embodiments, the static magnetic flux generating means is composed of the permanent magnet alone, but depending on the type of the permanent magnet, it may be a magnet structure in which the permanent magnet and the yoke (magnetic material) are combined. .

FIG. 5 is a perspective view of an outdoor microphone device according to a second embodiment of the present invention. The outdoor microphone device 18 shown in FIG. 9A is provided with a bar-shaped magnet 19 along a pillar 17 made of a non-magnetic material such as aluminum, and the outdoor microphone device 20 shown in FIG.
Are provided with ring-shaped magnets 21 surrounding the columns 17, and each form a magnetic field around the windshield 4. In addition, these configurations are the columns 1 of the existing outdoor microphone device.
Since it can be realized by simply attaching the magnets 19 and 21 to the 7, it is possible to easily realize the outdoor microphone device in which birds do not approach.

As a modification of the second embodiment, a part of the support pillar may be made of a magnet so that the magnetic flux direction coincides with the longitudinal direction of the support pillar. In this case, it goes without saying that a stronger magnetic field is formed when the pillars are made of a magnetic material.

FIG. 6 is a perspective view showing the installation of an outdoor microphone device according to a third embodiment of the present invention. The outdoor microphone device 22 includes a support column 23 that supports a microphone.
And a support base 25 for fixing to the installation portion 24, and at least the support base 25 or its periphery 24 is provided with a static magnetic flux generating means. For example, a permanent magnet 26 and a yoke (magnetic material) 27 are provided as a set in the support base 25.
This support 25 or its periphery 24 can be configured by combining a permanent magnet and a yoke (magnetic material), or a space for arranging a large magnet can be easily secured, and a strong magnetic field can be obtained. be able to.

In the above embodiments, a permanent magnet or a combination of a permanent magnet and a yoke is used as the static magnetic flux generating means, but the present invention is not limited to this, and a permanent magnet is used instead. Even if an electromagnet is used, the same effect can be obtained.

[0023]

As described above, in the outdoor microphone device according to the present invention, since the static magnetic flux generating means changes the geomagnetism in the space around the microphone, the bird approaches the microphone dislike the disturbance of the geomagnetism. Therefore, it is possible to realize an outdoor microphone device that can stably perform outdoor acoustic measurement for a long period of time with almost no manpower for maintenance and inspection. Further, since the present invention uses the static magnetic flux generating means, it does not generate raindrop noise or wind noise, as compared with the bird repelling means that has been conventionally adopted.

When a static magnetic flux generating means is attached to the column,
Further, when the static magnetic flux generating means is provided on or around the support base of the supporting means, a large magnet can be adopted, so that a strong magnetic field can be obtained.

When a part or all of the columns and the inner frame are made of magnets, there is no change in the external shape as compared with the conventional windscreen, and therefore the acoustic characteristics are not impaired, which is convenient.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an outdoor microphone device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the inner frame of the windbreak clean of the first embodiment.

FIG. 3 is a perspective view of a main part of an outdoor microphone device according to a modification of the first embodiment.

FIG. 4 is a cross-sectional view of a windbreak screen according to a modification of the first embodiment.

FIG. 5 is a perspective view of a main part of an outdoor microphone device according to a second embodiment of the present invention.

FIG. 6 is a perspective view of the installation of an outdoor microphone device according to a third embodiment of the present invention.

[Explanation of symbols]

1 ... Outdoor installation microphone device, 2 ... Microphone, 3
... Supporting means, 4, ... Windproof screen, 5 ... Waterproof cloth, 6 ...
Inner frame, 7 ... Base, 8 ... Intermediate member, 9 ... Outdoor installed microphone device, 10 ... Inner frame, 11 ... Magnet (static magnetic flux generating means), 12 ... Outdoor installed microphone device, 13 ... Rod magnet (static magnetic flux) Generating means), 14 ... Outdoor installation microphone device, 15 ... Base, 15a ... Collar part, 16 ... Magnet (static magnetic flux generating means), 17 ... Strut, 18 ... Outdoor installation microphone device, 19 ... Rod magnet (static magnetic flux) Generating means), 20
... Outdoor installation microphone device, 21 ... Ring magnet (static magnetic flux generating means), 22 ... Outdoor installation microphone device,
23 ... Prop, 24 ... Installation place, 25 ... Supporting base, 26 ... Magnet (static magnetic flux generating means), 27 ... Magnetic body (static magnetic flux generating means), A ... Magnetic field.

Claims (5)

[Claims] 1. An outdoor microphone device comprising a microphone for detecting sound and a supporting means for fixing the microphone to an outdoor space, comprising static magnetic flux generating means for changing the geomagnetism in the space around the microphone. An outdoor microphone device characterized in that 2. The outdoor microphone device according to claim 1, wherein the microphone includes a windproof screen, and the static magnetic flux generating means is provided in the windproof screen. 3. The outdoor microphone device according to claim 1, wherein the supporting means includes a pillar made of a non-magnetic material that supports the microphone, and the static magnetic flux generating means is attached to the pillar. Outdoor microphone device. 4. The outdoor microphone device according to claim 1, wherein the support means includes a support stand for fixing the installation place, and the static magnetic flux generating means is provided on or around the support stand. An outdoor microphone device characterized in that 5. An outdoor microphone device in which a microphone for detecting sound, a windproof screen for covering the microphone, and an inner frame for supporting the windproof screen inside thereof are fixed to upper ends of the columns, wherein the inner frame and the columns are provided. An outdoor microphone device characterized in that all or part of the above is constituted by static magnetic flux generating means.