JP7000273B2 - Acoustic calibrator adapter and acoustic calibration system - Google Patents

Description

The present invention relates to a technique for calibrating a microphone using an acoustic calibrator.

As an acoustic calibrator for calibrating a microphone, an acoustic calibrator for calibrating a microphone having a sound collecting portion at the tip of a cylindrical shape is known (for example, Patent Documents 1 and 2).
This acoustic calibrator is equipped with a socket that inserts the cylindrical tip of the microphone, and is inserted into the socket by radiating a calibration sound into the internal space that communicates with the hollow part of the socket. Have the microphone pick up the sound for calibration.

In addition, by using an adapter for converting the diameter of the socket of the acoustic calibrator, it is possible to calibrate a microphone whose diameter of the tip of the cylindrical shape does not match the diameter of the socket of the acoustic calibrator.

This adapter has a different cylindrical insertion part with a diameter that matches the diameter of the acoustic calibrator socket provided at the bottom, and a different diameter of the acoustic calibrator socket provided coaxially with the insertion part at the top. The socket part of the diameter is provided so that the opening provided at the lower end of the insertion part and the hollow part of the socket part communicate with each other. By inserting the tip of the microphone, the sound for calibration emitted by the acoustic calibrator into the internal space is collected by the microphone through the adapter.

Japanese Unexamined Patent Publication No. 2001-304951 Japanese Unexamined Patent Publication No. 2006-308567

According to the above-mentioned technique using an adapter, a microphone having a cylindrical tip having a diameter that does not match the diameter of the socket of the acoustic calibrator is attached to the acoustic calibrator using the adapter to calibrate the microphone. be able to.

However, since this adapter only converts the diameter of the socket of the acoustic calibrator, some adapters do not have a structure that can be stably inserted into the socket around the sound collecting part. It cannot be calibrated by mounting it on an acoustic calibrator equipped with a socket that inserts a cylindrical tip.

Therefore, it is an object of the present invention to provide an adapter capable of calibrating microphones of various shapes using an acoustic calibrator provided with a socket for inserting a cylindrical tip of the microphone.

In order to solve the above-mentioned problems, the present invention comprises a socket having a recess into which the tip of a microphone having a first diameter is inserted, and an acoustic calibrator that radiates a sound for calibration into an internal space communicating with the recess of the socket. The first unit is an adapter for attaching a target microphone, which is a microphone equipped with a microphone unit that picks up sound from a sound collecting hole provided on the first surface and a cable connected to the microphone unit. , The first unit and the second unit separably connected to each other are included. Here, the first unit includes a cylindrical portion having the first diameter that can be inserted into the socket of the acoustic calibrator, which forms the lower portion of the first unit, and the upper surface and the cylinder of the first unit. It has a through hole which is a hole through the first unit, which is opened on the lower surface of the portion. Further, the second unit has a support block and a fitting portion that fits with the first unit in a state where the upper surface of the first unit and the lower surface of the support block are in contact with each other. Then, on the lower surface of the support block, a recess, which is an upward recess into which the microphone portion can be fitted from below with the first surface facing downward, and an end of the lower surface of the support block from the recess. A cable groove, which is a groove through which the cable can pass, is formed. Further, the fitting portion has a shape that does not prevent the cable extending to the end of the lower surface of the support block through the cable groove from being pulled out to the outside of the second unit. Further, in the recess, the microphone portion fitted in the recess is in a state where the first unit and the fitting portion are fitted and the upper surface of the first unit is in contact with the lower surface of the support block. The position of the sound collecting hole is provided so as to be a position within the opening of the through hole on the upper surface of the first unit.

Further, in order to solve the above-mentioned problems, the present invention includes a socket having a recess into which the tip of a microphone having a first diameter is inserted, and an acoustic sound for radiating a calibration sound into an internal space communicating with the recess of the socket. The first adapter is attached to the calibrator to attach a target microphone, which is a microphone equipped with a microphone unit that picks up sound from a sound collecting hole provided on the first surface and a cable connected to the microphone unit. It is configured to include a unit and a second unit that is separably connected to the first unit. Here, the first unit includes a cylindrical portion having the first diameter that can be inserted into the socket of the acoustic calibrator, which forms the lower portion of the first unit, and the upper surface and the cylinder of the first unit. It has a through hole which is a hole through the first unit, which is opened on the lower surface of the portion. Further, the second unit has a support block, a fitting portion that fits with the first unit in a state where the upper surface of the first unit and the lower surface of the support block are in contact with each other, and a connecting path. .. Further, the lower surface of the support block has an upwardly recessed hole and an upwardly recessed recess into which the microphone portion can be fitted from below with the first surface facing the direction of the hole. A cable groove, which is a groove through which the cable can pass, extends from the recess to the end of the lower surface of the support block. Further, the connecting path is a hole extending from the hole to the recess or a groove formed on the lower surface of the support block, and the microphone portion is fitted into the recess with the first surface facing the direction of the hole. At that time, the sound collecting hole and the hole on the first surface of the microphone unit communicate with each other via the connecting path. Further, the fitting portion has a shape that does not prevent the cable extending to the end of the lower surface of the support block through the cable groove from being pulled out to the outside of the second unit. Then, in the hole, the position of the hole is the position of the first unit in a state where the first unit and the fitting portion are fitted and the upper surface of the first unit and the lower surface of the support block are in contact with each other. It is provided so as to be located within the opening of the through hole on the upper surface.

According to the adapter as described above, the microphone can be attached to the acoustic calibrator for the microphone of the first diameter in the form of being sandwiched between the first unit and the second unit. Even a microphone that does not have a structure that can be stably inserted into a socket around it can be calibrated by attaching it to an acoustic calibrator for a microphone having a first diameter.

Here, the through hole of the first unit may have a shape that fits with the tip of a microphone having a second diameter different from that of the first diameter, which is inserted from above.

Further, in this case, the through hole of the first unit is recessed downward from the upper surface of the first unit, the recess into which the tip of the microphone having the second diameter is inserted, and the recess from the lower surface of the recess. It may be formed by a hole penetrating to the lower surface of the cylindrical portion. Further, the diameter of the lower portion of the recess forming the through hole of the first unit is set to the size at which the tip of the microphone having the second diameter is inserted, and the opening of the upper surface of the first unit of the through hole. The size of the diameter may be larger than the size of the diameter of the lower portion.

In this case, the microphone having the first diameter may be a microphone having a diameter of 1/2 inch, and the microphone having the second diameter may be a microphone having a diameter of 1/4 inch.

By doing so, it is possible to calibrate a microphone having a second diameter different from that of the first diameter by using an acoustic calibrator for a microphone having a first diameter.

Further, an annular seal member may be provided on the upper surface of the first unit. However, in the seal member, when the first unit and the fitting portion are fitted and the upper surface of the first unit and the lower surface of the support block are in contact with each other, the seal member is viewed in the vertical direction. The sound collecting hole of the microphone portion is arranged inside so as to be located, and in this state, the sealing member seals between the upper surface of the first unit and the lower surface of the support block.

Further, a plurality of pairs of the recess and the cable groove may be provided on the lower surface of the support block of the adapter.
The present invention also provides an acoustic calibration system including an adapter and the acoustic calibrator.

As described above, according to the adapter according to the present invention, it is possible to calibrate various microphones by using an acoustic calibrator provided with a socket for inserting the cylindrical tip of the microphone.

It is a figure which shows the acoustic calibrator which concerns on embodiment of this invention. It is a figure which shows the 1/2 inch microphone which concerns on embodiment of this invention, and the state of the calibration thereof. It is a figure which shows the 1/4 inch microphone and the small microphone which concerns on embodiment of this invention. It is a figure which shows the common unit which concerns on embodiment of this invention. It is a figure which shows the individual unit which concerns on embodiment of this invention. It is a figure which shows the mode of calibration of the 1/4 inch microphone and the small microphone which concerns on embodiment of this invention. It is a figure which shows the other example of the adapter which concerns on embodiment of this invention. It is a figure which shows the other example of the individual unit which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described.
FIG. 1a shows the acoustic calibrator of this embodiment.
Here, FIG. 1a1 shows a perspective view of the acoustic calibrator 1, FIG. 1a2 shows the upper surface of the acoustic calibrator 1, FIG. 1a3 shows the front surface of the acoustic calibrator 1, and FIG. 1a4 shows the acoustic calibrator 1. The lower surface is shown, and FIG. 1a5 shows the right side surface of the acoustic calibrator 1. The rear surface of the acoustic calibrator 1 appears as the front surface, and the left surface of the acoustic calibrator 1 appears as the right surface.

As shown in the figure, the acoustic calibrator 1 has a substantially rectangular parallelepiped shape, and a socket 11 having a circular opening is provided on the upper surface of the acoustic calibrator 1.
As shown in the upper sectional view of the acoustic calibrator 1 shown in FIG. 1b, the socket 11 forms a first recess 111 having a shape in which a cylinder having a diameter of 1/2 inch is fitted, and a first O-ring 14 is a second. 1 It is arranged inside the recess 111. Further, in the central portion of the lower surface of the first recess 111, a hole having a diameter smaller than that of the first recess 111 is provided so as to communicate with the internal space 12 of the acoustic calibrator 1. Then, the sound for calibration is radiated into the internal space 12 by the speaker 13 arranged below the internal space 12.

Such an acoustic calibrator 1 has a cylindrical shape with a tip portion having a diameter of 1/2 inch as shown in FIG. 2a, and is a 1/2 inch microphone which is a microphone that captures sound at the tip portion and collects sound. 2 calibration can be performed.

To calibrate the 1/2 inch microphone 2, as shown in FIG. 2b, the tip of the 1/2 inch microphone 2 is inserted into the first recess 111 of the socket 11 of the acoustic calibrator 1, and the 1/2 inch microphone 2 is calibrated. Is performed in the state of being attached to the acoustic calibrator 1.

In the state shown in FIG. 2b, the gap between the 1/2 inch microphone 2 and the first recess 111 is sealed by the first O-ring 14, and the speaker 13 of the acoustic calibrator 1 to the internal space 12 of the acoustic calibrator 1 are sealed. The calibration sound radiated to the inside space 12, passes through the hole on the lower surface of the first recess 111 of the socket 11, reaches the front end of the 1/2 inch microphone 2, and is picked up.

Hereinafter, an adapter used for mounting a 1/4 inch microphone, which is a microphone that does not match the socket 11 of the acoustic calibrator 1, and a small microphone, will be described in the acoustic calibrator 1.

Here, as shown in FIG. 3a, the 1/4 inch microphone 3 is a microphone having a cylindrical shape with a tip portion having a diameter of 1/4 inch, and the tip portion captures sound and collects sound.

Next, FIG. 3b shows the small microphone 4.
3b1 represents the front surface of the small microphone 4, FIG. 3b2 represents the top surface of the small microphone 4, FIG. 3b3 represents the side surface of the small microphone 4, and FIG. 3b4 represents the bottom surface of the small microphone 4.

As shown in the figure, the small microphone 4 has a shape in which a cable 42 is connected to the rear portion of a rectangular parallelepiped microphone portion 41.
A sound collecting hole 411 is provided on the lower surface of the rectangular parallelepiped microphone portion 41 at a position slightly forward in the center in the left-right direction and slightly in the front-back direction, and the small microphone 4 collects the sound captured from the sound collecting hole 411. Make a sound.

In the present embodiment, the size of the microphone portion 41 of the small microphone 4 is, for example, the size H in the vertical direction is about 3 mm to 4 mm, the size W in the left-right direction is about 4 mm to 5 mm, and the size L in the front-rear direction is about 7 mm. And.

Next, the adapter of the present embodiment is used only for the common unit shared for mounting the 1/4 inch microphone 3 and the small microphone 4 to the acoustic calibrator 1 and the mounting of the small microphone 4 to the acoustic calibrator 1. It consists of individual units.

First, the common unit will be described.
FIG. 4 shows the configuration of the common unit.
4a shows the upper surface of the common unit 5, FIG. 4b shows the side surface of the common unit 5, and FIG. 4c shows the lower surface of the common unit 5. Further, FIG. 4d shows a cross section of the common unit 5 according to the cross section line AA of FIG. 5a, and FIG. 4e shows a cross section of the common unit 5 according to the cross section line BB of FIG. 4a. Further, FIG. 4f shows a view of the common unit 5 viewed from diagonally above, and FIG. 4g shows a view of the common unit 5 viewed from diagonally below.

As shown in the figure, the common unit 5 includes a cylindrical upper cylindrical portion 51 constituting the upper portion of the common unit 5, a cylindrical lower cylindrical portion 52 constituting the lower portion of the common unit 5, and an upper cylindrical portion 51. A flange portion 53 that protrudes laterally in a flange shape is provided between the lower cylindrical portion 52 and the lower cylindrical portion 52.

The diameter of the lower cylindrical portion 52 is 1/2 inch, which is the same as the diameter of the front end portion of the 1/2 inch microphone 2, and the diameter of the upper cylindrical portion 51 is set to be larger than that of the lower cylindrical portion 52.

At the center of the common unit 5, a second recess 54 having a shape recessed downward from the upper surface and having a shape in which a cylinder having a diameter of 1/4 inch is fitted is formed, and a second recess 54 is formed inside the second recess 54. 2 O-rings 55 are arranged.

Further, in the central portion of the lower surface of the second recess 54, a hole 56 having a diameter smaller than that of the second recess 54 and communicating downward is provided.
Further, the upper cylindrical portion 51 is provided with four ball plungers 57 having balls that are urged outward, protrude from the outer peripheral surface without external force, and retract in the outer peripheral surface direction in response to the external force. , The upper cylindrical portion 51 is provided at a position approximately at the center in the vertical direction.
Further, on the upper surface of the upper cylindrical portion 51, a third O-ring 58 arranged so as to surround the opening of the second recess 54 is fixed in a form partially embedded in the upper surface of the upper cylindrical portion 51. There is.

Next, the individual units will be described.
FIG. 5 shows the configuration of individual units.
5a shows the upper surface of the individual unit, FIG. 5b shows the side surface of the individual unit, and FIG. 5c shows the lower surface of the individual unit. Further, FIG. 5d shows a cross section of the individual unit according to the cross section line AA of FIG. 5a, and FIG. 5e shows a cross section of the individual unit according to the cross section line BB of FIG. 5a. Further, FIG. 5f shows the appearance of the individual unit viewed from diagonally above, and FIG. 5g shows the appearance of the individual unit viewed from diagonally below.

As shown in the figure, the individual unit 6 has a hollow cylindrical shape with an open lower surface and a closed upper surface as a whole, a side portion 61 forming a side surface of a hollow cylindrical shape with an open lower surface and a closed upper surface, and an upper surface with an open lower surface. Consists of an upper bottom portion 62 that forms an upper surface in the shape of a closed hollow cylinder.

The inner diameter of the side portion 61 is set so that the upper cylindrical portion 51 of the common unit 5 fits inside the side portion 61. Further, on the inner peripheral surface of the side portion 61, a groove 63 recessed in the outer peripheral direction is provided at a position approximately at the center in the vertical direction.

Then, as shown in FIG. 5h, when the upper cylindrical portion 51 of the common unit 5 is inserted from below and fitted into the inside of the side portion 61 of the individual unit 6, the ball plunger 57 of the upper cylindrical portion 51 of the common unit 5 is fitted. The ball is fitted into the groove 63 on the inner peripheral surface of the side portion 61 of the individual unit 6, so that the common unit 5 and the individual unit 6 are connected to each other.

Next, on the lower surface of the upper bottom portion 62 of the individual unit 6, the lower surface of the microphone portion 41 of the small microphone 4 is mounted on the lower surface of the upper bottom portion 62 of the small microphone 4 as shown in a view of the individual unit 6 viewed diagonally downward from the side portion 61 shown in FIG. 5j. The outer peripheral side of the upper bottom portion 62 from the recess 64 for accommodating the recess 64 recessed upward for fitting downward and the cable 42 connected to the microphone portion 41 of the small microphone 4 fitted in the recess 64. Two sets of cable recesses 65, which extend to the end and are recessed upward, are provided.

The side portion 61 is provided with two notches 66 for pulling out the cable 42 from the cable recess 65 to the outside of the side portion 61.
Here, the microphone portion 41 of the small microphone 4 is fitted into the recess 64 on the lower surface of the upper bottom portion 62 of the individual unit 6 with the lower surface facing downward, and the upper cylindrical portion 51 of the common unit 5 is fitted inside the side portion 61 of the individual unit 6. The cross section of the adapter in the state where is fitted is shown in FIG. 5k. Further, FIG. 5 m shows the arrangement of the second recess 54, the third O-ring 58, and the small microphone 4 of the common unit 5 in this state as viewed from above.

As shown in the figure, the recess 64 on the lower surface of the upper bottom portion 62 of the individual unit 6 has the lower surface downward in the recess 64 with the upper cylindrical portion 51 of the common unit 5 fitted inside the side portion 61 of the individual unit 6. The sound collecting hole 411 of the microphone portion 41 of the small microphone 4 fitted toward the inside of the common unit 5 is arranged so as to be inside the second recess 54 of the common unit 5. In this state, the third O-ring 58 on the upper surface of the upper cylindrical portion 51 of the common unit 5 abuts on the outer peripheral side of the sound collecting hole 411 of the microphone portion 41 of the small microphone 4 to form the sound collecting hole 411. The third O-ring 58 is arranged so as to seal the portion on the outer peripheral side of the third O-ring 58.

Hereinafter, calibration of the 1/4 inch microphone 3 and the small microphone 4 using such a common unit 5 and an individual unit 6 will be described.
First, when calibrating the 1/4 inch microphone 3, as shown in FIG. 6a, the lower cylindrical portion 52 of the common unit 5 is fitted into the first recess 111 of the socket 11 of the acoustic calibrator 1 and mounted. .. Further, the tip of the 1/4 inch microphone 3 is fitted and inserted into the second recess 54 of the common unit 5.

In this state, the gap between the lower cylindrical portion 52 of the common unit 5 and the first recess 111 is sealed by the first O-ring 14, and the gap between the 1/4 inch microphone 3 and the second recess 54 is. It is sealed with a second O-ring 55.

In this state, when the sound for calibration is radiated from the speaker 13 of the acoustic calibrator 1 to the internal space 12 of the acoustic calibrator 1, the sound is the internal space 12, the hole on the lower surface of the first recess 111 of the socket 11, and the common unit. Through the hole 56 on the lower surface of the second recess 54 of 5, the sound reaches the front end of the 1/4 inch microphone 3 and is picked up.

Next, when calibrating the small microphone 4, as shown in FIG. 6b1, the microphone portion 41 of the small microphone 4 is directed downward in each of the two recesses 64 on the lower surface of the upper bottom portion 62 of the individual unit 6. The cable 42 of the small microphone 4 is pulled out through the cable recess 65 and the notch 66.

Then, as shown in FIG. 6b2, the upper cylindrical portion 51 of the common unit 5 is fitted inside the side portion 61 of the individual unit 6, and the common unit 5 and the individual unit 6 are integrated as shown in FIG. 6b3.

Then, as shown in FIG. 6c, the lower cylindrical portion 52 of the common unit 5 integrated with the individual unit 6 is fitted and mounted in the first recess 111 of the socket 11 of the acoustic calibrator 1.
In this state, when the sound for calibration is radiated from the speaker 13 of the acoustic calibrator 1 to the internal space 12 of the acoustic calibrator 1, the sound is the internal space 12, the hole on the lower surface of the first recess 111 of the socket 11, and the common unit. The sound is collected by reaching the sound collecting hole 411 of the small microphone 4 through the hole 56 on the lower surface of the second recess 54 and the second recess 54 of 5.

The embodiment of the present invention has been described above.
In the above embodiment, the individual unit 6 accommodates two small microphones 4 and is attached to the acoustic calibrator 1 via the common unit 5. However, the individual unit 6 accommodates only one small microphone 4. It may be configured to accommodate.

On the contrary, the common unit 5 and the individual unit 6 may be configured to accommodate a larger number of small microphones 4 and be attached to the acoustic calibrator 1.
In this case, for example, as shown in the cross-sectional view of the common unit 5 shown in FIG. 7a, the shape of the lower part of the second recess 54 of the common unit 5 remains as a shape in which a cylinder having a diameter of 1/4 inch is fitted. The size of the opening of the second recess 54 appearing on the upper surface of the upper cylindrical portion 51 is increased so that the shape of the upper portion expands upward. Then, as shown in FIG. 7b, the lower surface of the individual unit 6 is shown, and n sets of the recess 64, the cable recess 65, and the notch 66 are radially centered on the axis of the second recess 54 (8 in the figure). Piece) Provide. However, in the recess 64 on the lower surface of the upper bottom portion 62 of the individual unit 6, the lower surface faces downward in each recess 64 with the upper cylindrical portion 51 of the common unit 5 fitted inside the side portion 61 of the individual unit 6. The sound collecting hole 411 of the microphone portion 41 of the small microphone 4 fitted therein is arranged so as to be inside the second recess 54 of the common unit 5.

In this state, as shown in FIG. 7c, the lower cylindrical portion 52 of the common unit 5 is fitted into the first recess 111 of the socket 11 of the acoustic calibrator 1 and mounted, and the tip of the 1/4 inch microphone 3 is attached. By inserting and mounting it in the second recess 54 of the common unit 5, the 1/4 inch microphone 3 can be mounted on the acoustic calibrator 1 for calibration.

Further, as shown in FIG. 7d1, the microphone portion 41 of the small microphone 4 is fitted into each of the n recesses 64 on the lower surface of the upper bottom portion 62 of the individual unit 6 with the lower surface facing downward, and as shown in FIG. 7d2. The upper cylindrical portion 51 of the common unit 5 is fitted inside the side portion 61 of the individual unit 6, the common unit 5 and the individual unit 6 are integrated as shown in FIG. 7d3, and then the lower cylindrical portion 52 of the common unit 5 is integrated. As shown in FIG. 7e, by inserting and mounting it in the first recess 111 of the socket 11 of the acoustic calibrator 1, it can be mounted on the small microphone acoustic calibrator and calibrated.

Further, the individual units 6 in the above embodiments may be configured as shown in FIGS. 8a1 to 8a5.
Here, FIG. 8a1 represents the upper surface of the individual unit 6, FIG. 8a2 represents the side surface of the individual unit 6, and FIG. 8a3 represents the lower surface of the individual unit 6. 8a4 shows the cross section of the individual unit 6 according to the cross section line AA of FIG. 8a3, and FIG. 8a5 shows the cross section of the individual unit 6 according to the cross section line BB of FIG. 8a3.

As shown in the figure, on the lower surface of the upper bottom portion 62 of the individual unit 6, the microphone portion 41 and the cable 42 of the small microphone 4 are fitted with an upwardly recessed groove for fitting the lower surface toward the center of the individual unit 6. Four grooves 91 for a certain microphone are provided. Further, the side portion 61 of the individual unit 6 is provided with four notches 66 for pulling out the cable 42 of the small microphone 4 fitted in the groove 91 for each microphone to the outside of the side portion 61.

Further, in the center of the upper bottom portion 62 of the individual unit 6, a central hole 92 which is a hole recessed upward and a communication hole 93 provided for each of the four microphone grooves 91 are provided. FIG. 8b shows the positional relationship of the microphone groove 91, the central hole 92, and the connecting hole 93 as seen in the vertical direction. The communication hole 93 is a hole for connecting the microphone groove 91 and the center hole 92, and the opening of the communication hole 93 on the microphone groove 91 side is such that the lower surface of the small microphone 4 is placed in the microphone groove 91 in the direction of the center hole 92. It is in a position facing the sound collecting hole 411 of the microphone unit 41 in a state of being fitted toward the microphone unit 41. Therefore, the sound collecting hole 411 of the microphone portion 41 of the small microphone 4 fitted in the microphone groove 91 is exposed to the central hole 92.

When calibrating the small microphone 4 using such an individual unit 6, as shown in FIG. 8c1, the small microphone 4 is provided in each of the four microphone grooves 91 on the lower surface of the upper bottom portion 62 of the individual unit 6. The lower surface is fitted so as to face the center hole 92, and the cable 42 of the small microphone 4 is pulled out through the notch 66.

Then, as shown in FIG. 8c2, the upper cylindrical portion 51 of the common unit 5 is fitted inside the side portion 61 of the individual unit 6, and the common unit 5 and the individual unit 6 are integrated as shown in FIG. 8c3.

Then, the lower cylindrical portion 52 of the common unit 5 is fitted and mounted in the first recessed portion 111 of the socket 11 of the acoustic calibrator 1.
In this state, when the sound for calibration is radiated from the speaker 13 of the acoustic calibrator 1 to the internal space 12 of the acoustic calibrator 1, the sound is the internal space 12, the hole on the lower surface of the first recess 111 of the socket 11, and the common unit. The sound is collected by reaching the sound collecting hole 411 of the small microphone 4 through the hole on the lower surface of the second recess 54 of No. 5, the second recess 54, the center hole 92 of the individual unit 6, and the connecting hole 93.

The individual unit 6 shown in FIG. 8a may be provided with a connecting groove, which is a groove from which the overlapping portion is removed under the connecting hole 93 of the upper bottom portion 62, in place of the connecting hole 93.
Further, in the individual unit 6 shown in FIG. 8a, the shape of the lower part of the second recess 54 shown in FIG. 7a is kept as a shape in which a cylinder having a diameter of 1/4 inch is fitted, and the shape of the upper part is directed upward. It may be used in combination with the common unit 5 having a shape that expands.

The embodiment of the present invention has been described above.
In the above embodiment, the case where the acoustic calibrator 1 for a microphone having a diameter of 1/2 inch is equipped with the microphone having a diameter of 1/4 inch by using the common unit 5, but this embodiment is arbitrary. When the second caliber microphone is attached to the acoustic calibrator 1 for the first caliber microphone, with the first caliber as the first caliber and any caliber different from the first caliber as the second caliber. , Applicable as well. In this case, the second caliber may be larger than the first caliber.

As described above, according to the present embodiment, it is common to non-cylindrical microphones such as the small microphone 4 and microphones having no structure that can be stably inserted into the socket 11 around the sound collecting hole 411. It can be mounted on an acoustic calibrator 1 for a microphone having a predetermined diameter in a form of being sandwiched between a unit 5 and an individual unit 6 to calibrate the microphone. Further, it is possible to calibrate microphones having different diameters by using the acoustic calibrator 1 for microphones having a predetermined diameter.

1 ... Acoustic calibrator, 2 ... 1/2 inch microphone, 3 ... 1/4 inch microphone, 4 ... Small microphone, 5 ... Common unit, 6 ... Individual unit, 11 ... Socket, 12 ... Internal space, 13 ... Speaker, 14 ... 1st O-ring, 41 ... Microphone part, 42 ... Cable, 51 ... Upper cylindrical part, 52 ... Lower cylindrical part, 53 ... Collar part, 54 ... Second recess, 55 ... Second O-ring, 56 ... hole, 57 ... ball plunger, 58 ... third O-ring, 61 ... side, 62 ... upper bottom, 63 ... groove, 64 ... recess, 65 ... cable recess, 66 ... notch, 91 ... microphone groove, 92 ... Central hole, 93 ... Communication hole, 111 ... First recess, 411 ... Sound collecting hole.

Claims (9)

An acoustic calibrator provided on the first surface of an acoustic calibrator, which is provided with a socket having a recess into which the tip of a microphone having a first diameter is inserted and radiates a sound for calibration into an internal space communicating with the recess of the socket. An adapter for attaching a target microphone, which is a microphone equipped with a microphone unit that picks up sound from a hole and a cable connected to the microphone unit.
It includes a first unit and a second unit that is separably connected to the first unit.
The first unit is
A cylindrical portion of the first diameter that can be inserted into the socket of the acoustic calibrator, which forms the lower portion of the first unit.
It has a through hole that is a hole that penetrates the first unit and has an opening on the upper surface of the first unit and the lower surface of the cylindrical portion.
The second unit is
Support block and
It has a fitting portion that fits with the first unit in a state where the upper surface of the first unit and the lower surface of the support block are in contact with each other.
The lower surface of the support block has a recess, which is an upward recess into which the microphone portion can be fitted from below with the first surface facing downward, and a recess extending from the recess to the end of the lower surface of the support block. In addition, a cable groove, which is a groove through which the cable can pass, is formed.
The fitting portion has a shape that does not prevent the cable extending from the cable groove to the end of the lower surface of the support block to be pulled out to the outside of the second unit.
In the recess, the sound pickup of the microphone portion fitted in the recess is in a state where the first unit and the fitting portion are fitted and the upper surface of the first unit and the lower surface of the support block are in contact with each other. An adapter characterized in that the position of the hole is provided so as to be a position within the opening of the through hole on the upper surface of the first unit.
An acoustic calibrator provided on the first surface of an acoustic calibrator, which is provided with a socket having a recess into which the tip of a microphone having a first diameter is inserted and radiates a sound for calibration into an internal space communicating with the recess of the socket. An adapter for attaching a target microphone, which is a microphone equipped with a microphone unit that picks up sound from a hole and a cable connected to the microphone unit.
It includes a first unit and a second unit that is separably connected to the first unit.
The first unit is
A cylindrical portion of the first diameter that can be inserted into the socket of the acoustic calibrator, which forms the lower portion of the first unit.
It has a through hole that is a hole that penetrates the first unit and has an opening on the upper surface of the first unit and the lower surface of the cylindrical portion.
The second unit is
Support block and
With the upper surface of the first unit and the lower surface of the support block in contact with each other, the fitting portion to be fitted with the first unit and the fitting portion.
Has a connecting route,
The lower surface of the support block has an upwardly recessed hole, an upwardly recessed recess into which the microphone portion can be fitted from below with the first surface facing the direction of the hole, and the recess. A cable groove, which is a groove through which the cable can pass, is formed from the support block to the end of the lower surface of the support block.
The connecting path is a hole extending from the hole to the recess or a groove formed on the lower surface of the support block, and when the microphone portion is fitted into the recess with the first surface facing the hole. In addition, the sound collecting hole and the hole on the first surface of the microphone unit communicate with each other via the connecting path.
The fitting portion has a shape that does not prevent the cable extending from the cable groove to the end of the lower surface of the support block to be pulled out to the outside of the second unit.
In the hole, the position of the hole is the position of the upper surface of the first unit in a state where the first unit and the fitting portion are fitted and the upper surface of the first unit and the lower surface of the support block are in contact with each other. An adapter characterized in that it is provided so as to be located within the opening of the through hole.
The adapter according to claim 1 or 2.
An adapter characterized in that the through hole of the first unit has a shape inserted from above and fitted with the tip of a microphone having a second diameter different from that of the first diameter.
The adapter according to claim 3.
The through hole of the first unit penetrates downward from the upper surface of the first unit to the recess into which the tip of the microphone having the second diameter is inserted, the lower surface of the recess, and the lower surface of the cylindrical portion. An adapter characterized by being formed from holes.
The adapter according to claim 4.
The size of the diameter of the lower portion of the recess forming the through hole of the first unit is the size in which the tip of the microphone having the second diameter is inserted, and the size of the upper surface of the first unit of the through hole is the size of the opening. An adapter characterized in that the size of the diameter is larger than the size of the diameter of the lower portion.
The adapter according to claim 3, 4 or 5.
The adapter characterized in that the first diameter microphone is a microphone having a diameter of 1/2 inch, and the second diameter microphone is a microphone having a diameter of 1/4 inch.
The adapter according to claim 1, 2, 3, 4, 5 or 6.
An annular sealing member is provided on the upper surface of the first unit.
The seal member is inside the seal member when viewed in the vertical direction in a state where the first unit and the fitting portion are fitted and the upper surface of the first unit and the lower surface of the support block are in contact with each other. The sound collecting hole of the microphone portion is arranged so as to be located, and in this state, the sealing member is characterized in that it seals between the upper surface of the first unit and the lower surface of the support block. Adapter to do.
The adapter according to claim 1, 2, 3, 4, 5, 6 or 7.
An adapter characterized in that a plurality of pairs of the recess and the cable groove are provided on the lower surface of the support block.
An acoustic calibration system comprising the adapter according to claim 1, 2, 3, 4, 5, 6, 7 or 8, and the acoustic calibrator.

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