JPH0549097A - Large sound pressure addition device for microphone characteristic measurement and calibration - Google Patents
Large sound pressure addition device for microphone characteristic measurement and calibrationInfo
- Publication number
- JPH0549097A JPH0549097A JP23086491A JP23086491A JPH0549097A JP H0549097 A JPH0549097 A JP H0549097A JP 23086491 A JP23086491 A JP 23086491A JP 23086491 A JP23086491 A JP 23086491A JP H0549097 A JPH0549097 A JP H0549097A
- Authority
- JP
- Japan
- Prior art keywords
- microphone
- pressure chamber
- sound pressure
- pressure
- characteristic measurement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005259 measurement Methods 0.000 title claims abstract 4
- 230000001131 transforming effect Effects 0.000 claims abstract description 3
- 230000007423 decrease Effects 0.000 abstract description 4
- 125000004122 cyclic group Chemical group 0.000 abstract 1
- 230000002093 peripheral effect Effects 0.000 description 5
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
(57)【要約】
【目的】 無響室等の設備を要しない小形で簡便なマイ
クロホン特性測定・校正用のを提供するものである。
【構成】 大音圧付加装置は、２つのカップ状本体１，
２が直接・間接に螺合されて容積調節自在に圧力室３を
画定するケーシング、圧力室に向って開口するシリンダ
孔10とカム作動７で往復動するピストン11から成る圧力
室変圧手段、及び圧力室に面するよう被測定マイクロホ
ンが気密性15をもってケーシングに装着されるマイクロ
ホン装着部12から構成されている。カムの周期的な作動
により生じるピストンの所定ストロークＳの往復動によ
り圧力室の容積Ｖは、ΔＶ＝２ＡＳの範囲で増減しする
ので、圧力室内の内圧は、周期的にΔＰ＝Ｋ×（ΔＶ／
Ｖ）の範囲で増減し、その結果、マイクロホンには、任
意に調節されたΔＰの音圧が加わる。
(57) [Summary] [Purpose] The purpose of the present invention is to provide a small, simple microphone characteristic measurement / calibration instrument that does not require equipment such as an anechoic chamber. [Structure] The high sound pressure adding device has two cup-shaped main bodies 1,
2. A casing in which 2 is directly or indirectly screwed to define a pressure chamber 3 so that the volume can be adjusted, a pressure chamber transforming means comprising a cylinder hole 10 opening toward the pressure chamber and a piston 11 reciprocating by a cam operation 7, and The microphone to be measured is composed of a microphone mounting portion 12 mounted on the casing with airtightness 15 so as to face the pressure chamber. Since the volume V of the pressure chamber increases and decreases within the range of ΔV = 2AS due to the reciprocating motion of the piston with a predetermined stroke S caused by the cyclic operation of the cam, the internal pressure of the pressure chamber is periodically ΔP = K × (ΔV /
V) range, resulting in an arbitrarily adjusted sound pressure of ΔP applied to the microphone.
Description
【０００１】[0001]
【産業上の利用分野】この発明は、マイクロホン特性測
定・校正用の大音圧付加装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high sound pressure adding device for measuring and calibrating microphone characteristics.
【０００２】[0002]
【従来の技術】マイクロホンの音響特性の一つに大音圧
における歪率特性があり、その歪率特性を測定・校正す
るためには、標準マイクロホン及び被測定マイクロホン
に１４０ｄＢ位の大音圧を加え、その場合の両者の特性
を比較して被測定マイクロホンの歪率特性を測定するの
であるが、その大音圧を加える手段として、従来の技術
においては次のような手段がとられている。2. Description of the Related Art One of the acoustic characteristics of a microphone is a distortion characteristic at a large sound pressure. To measure and calibrate the distortion characteristic, a large sound pressure of about 140 dB is applied to a standard microphone and a measured microphone. In addition, in that case, the characteristics of both microphones are compared to measure the distortion factor characteristics of the microphone under test. The conventional means has the following means as a means for applying a large sound pressure. ..
【０００３】無響室中において、パワーアンプを介して
例えばシンセサイザに接続されたスピーカの前面所定位
置にマイクロホンを設置して、シンセサイザによりスピ
ーカから大音響を発生させるのである。In an anechoic room, a microphone is installed at a predetermined position on the front surface of a speaker connected to a synthesizer via a power amplifier, and the synthesizer generates a loud sound from the speaker.
【０００４】[0004]
【発明が解決しようとする課題】上記の従来の技術にお
けるスピーカを用いてマイクロホンに１４０ｄＢ位の大
音圧を加える手段は、無響室も必要であり、装置自体も
かなり大規模なものとなる。この発明は、小形で簡便な
大音圧付加手段を提供するものである。The means for applying a large sound pressure of about 140 dB to the microphone using the above-mentioned conventional loudspeaker requires an anechoic chamber, and the apparatus itself becomes considerably large-scaled. .. The present invention provides a small and convenient large sound pressure adding means.
【０００５】[0005]
【課題を解決するための手段】この発明のマイクロホン
特性測定・校正用の大音圧付加装置は、２つのカップ状
本体が直接・間接に螺合されて容積調節自在に圧力室を
画定するケーシング、圧力室に向って開口するシリンダ
孔とカム作動で往復動するピストンから成る圧力室変圧
手段、及び圧力室に面するよう被測定マイクロホンが気
密性をもってケーシングに装着されるマイクロホン装着
部から構成されている。A large sound pressure adding device for measuring and calibrating a microphone characteristic according to the present invention is a casing in which two cup-shaped bodies are directly or indirectly screwed together to define a pressure chamber so that the volume can be adjusted. A pressure chamber transforming means including a cylinder hole opening toward the pressure chamber and a piston that reciprocates by a cam operation, and a microphone mounting portion in which a microphone to be measured is hermetically mounted in a casing so as to face the pressure chamber. ing.
【０００６】[0006]
【作用】ねじ結合されている２つのカップ状本体を相対
回転し、互に進退させることにより、圧力室の容積は調
節される。そこで、圧力室の容積を所定値にセットす
る。そして、外部の測定器に接続されたマイクロホン
は、マイクロホン装着部に気密性をもって装着され、圧
力室に面する。The volume of the pressure chamber is adjusted by rotating the two screw-coupled cup-shaped bodies relative to each other and moving them back and forth. Therefore, the volume of the pressure chamber is set to a predetermined value. Then, the microphone connected to the external measuring device is airtightly mounted on the microphone mounting portion and faces the pressure chamber.
【０００７】そこで、カムの周期的な作動によりピスト
ンは、所定ストロークの往復動をする。すると、ピスト
ンの往復動により圧力室の容積Ｖは、周期的にΔＶの範
囲で増減するので、圧力室内の内圧は、周期的にΔＰ＝
Ｋ×（ΔＶ／Ｖ）の範囲で増減する。Therefore, the piston reciprocates with a predetermined stroke due to the periodic operation of the cam. Then, the reciprocating movement of the piston causes the volume V of the pressure chamber to periodically increase and decrease within the range of ΔV, so that the internal pressure of the pressure chamber periodically changes to ΔP =
Increase or decrease within the range of K × (ΔV / V).
【０００８】その結果、マイクロホンには、ΔＰの音圧
が加わったことになる。Ｖは、上記のように２つのカッ
プ状本体の相対回転で調節され、ΔＶの変化は、カムに
より正確に規定される。従って、マイクロホンには、任
意の大きさの音圧を加えることができる。このようにし
てマイクロホンに任意の大きさの音圧が加えられ、その
出力を外部の測定器で検出することによりその大音圧特
性が検測される。As a result, the sound pressure of ΔP is applied to the microphone. V is adjusted by relative rotation of the two cup-shaped bodies as described above, and the change in ΔV is precisely defined by the cam. Therefore, an arbitrary amount of sound pressure can be applied to the microphone. In this way, a sound pressure of arbitrary magnitude is applied to the microphone, and its large sound pressure characteristic is measured by detecting its output with an external measuring device.
【０００９】[0009]
【実施例】この発明の実施例におけるマイクロホン特性
測定・校正用の大音圧付加装置を図面に従って説明す
る。図１に示すように、外側カップ状本体１と内側カッ
プ状本体２とが対向して入れ子状となって円筒形の圧力
室３が形成されるのであるが、外側カップ状本体１の内
周面及び内側カップ状本体２の外周面の夫々にはねじが
刻設され、外側カップ状本体１の内周面のねじ部４と内
側カップ状本体２の外周面のねじ部５とが螺合してい
る。なお、外側カップ状本体１と内側カップ状本体２と
は、同径で、他のねじ環で結合されてもよい。DESCRIPTION OF THE PREFERRED EMBODIMENTS A large sound pressure adding device for measuring and calibrating a microphone characteristic according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the outer cup-shaped body 1 and the inner cup-shaped body 2 face each other and form a nest to form a cylindrical pressure chamber 3. A screw is engraved on each of the surface and the outer peripheral surface of the inner cup-shaped body 2, and the screw portion 4 on the inner peripheral surface of the outer cup-shaped body 1 and the screw portion 5 on the outer peripheral surface of the inner cup-shaped body 2 are screwed together. is doing. The outer cup-shaped body 1 and the inner cup-shaped body 2 may have the same diameter and may be joined by another screw ring.
【００１０】外側カップ状本体１の底部の中央部には、
内方に向って突出部６（例えば円筒形突出部）が形成さ
れ、突出部６の中央部には、板カム７が突出部６の軸線
回りに回転自在に収容されたカム室８が形成されると共
に、板カム７の回転軸９は、突出部６の中心を回転自在
に貫通して外側カップ状本体１の外部に設けられたモー
タ（図示しない）に結合されている。更に、カム室８か
ら圧力室３に直径方向に貫通したシリンダ孔10，10が穿
設され、各シリンダ孔10には、断面積Ａのフリーピスト
ン11が嵌装され、各フリーピストン11の内端面は、板カ
ム７のカム面に当接されている。At the center of the bottom of the outer cup-shaped body 1,
A protrusion 6 (for example, a cylindrical protrusion) is formed inward, and a cam chamber 8 in which a plate cam 7 is housed rotatably around the axis of the protrusion 6 is formed in the center of the protrusion 6. At the same time, the rotary shaft 9 of the plate cam 7 is rotatably penetrated through the center of the protrusion 6 and is coupled to a motor (not shown) provided outside the outer cup-shaped body 1. Further, cylinder holes 10, 10 penetrating in a diameter direction from the cam chamber 8 to the pressure chamber 3 are bored, and a free piston 11 having a cross-sectional area A is fitted into each cylinder hole 10 and The end surface is in contact with the cam surface of the plate cam 7.
【００１１】板カム７のカム面は、１回転で２ｎ周期の
ストロークＳの単振動をフリーピストン11に与えるカム
形状である。シリンダ・ピストン機構は、単一のもの、
他の作動機構のもの等、適宜のものでもよい。The cam surface of the plate cam 7 has a cam shape which gives the free piston 11 a single vibration of a stroke S of 2n cycles per rotation. A single cylinder / piston mechanism,
It may be an appropriate one such as one having another operating mechanism.
【００１２】内側カップ状本体２の底部の中央部には、
外部から圧力室３へと外側のマイクロホン装着孔12と内
側の連通孔13とが段部14を形成して同軸線で連通開口し
ており、マイクロホン装着孔12の内周面には、Ｏリング
15が嵌着されている。At the center of the bottom of the inner cup-shaped body 2,
The microphone mounting hole 12 on the outside and the communication hole 13 on the inner side form a stepped portion 14 to communicate with the pressure chamber 3 from the outside by a coaxial line, and an O-ring is formed on the inner peripheral surface of the microphone mounting hole 12.
15 is fitted.
【００１３】大音圧付加装置の操作・作用について述べ
ると、ねじ結合（ねじ部４・ねじ部５）されている外側
カップ状本体１と内側カップ状本体２とを相対回転して
外側カップ状本体１に対し内側カップ状本体２を進退さ
せることにより、圧力室３の容積は調節される。そこ
で、圧力室３の容積を所定値Ｖにセットする。The operation and operation of the high sound pressure adding device will be described. The outer cup-shaped body 1 and the inner cup-shaped body 2 which are screw-coupled (screw portion 4 and screw portion 5) are rotated relative to each other to form an outer cup-shaped body. By moving the inner cup-shaped main body 2 back and forth with respect to the main body 1, the volume of the pressure chamber 3 is adjusted. Therefore, the volume of the pressure chamber 3 is set to a predetermined value V.
【００１４】そして、外部の測定器（図示しない）に接
続さたマイクロホンＭは、マイクロホン装着孔12に嵌装
され、マイクロホンＭの外周面がＯリング15に係合する
ことにより圧力室３の気密性は保たれる。The microphone M connected to an external measuring device (not shown) is fitted in the microphone mounting hole 12 and the outer peripheral surface of the microphone M is engaged with the O-ring 15 to hermetically seal the pressure chamber 3. Sex is preserved.
【００１５】そこで、モータにより回転軸９を所定回転
数で回転駆動すると、板カム７が回転し、それに応じて
フリーピストン11，11は、一定周波数で対向したストロ
ークＳの単振動運動をする。Therefore, when the motor drives the rotary shaft 9 to rotate at a predetermined rotational speed, the plate cam 7 rotates, and accordingly the free pistons 11 and 11 make a simple oscillating motion of the opposed strokes S at a constant frequency.
【００１６】すると、フリーピストン11，11の単振動運
動により圧力室３の容積Ｖは、一定周期でΔＶ＝２ＡＳ
の範囲で増減するので、圧力室３内の内圧は、一定周期
でΔＰ＝Ｋ×（ΔＶ／Ｖ）の範囲で増減する。Then, the volume V of the pressure chamber 3 is ΔV = 2AS at a constant cycle due to the simple oscillating motion of the free pistons 11, 11.
Therefore, the internal pressure in the pressure chamber 3 increases and decreases within a range of ΔP = K × (ΔV / V) in a constant cycle.
【００１７】その結果、マイクロホンＭのダイヤフラム
には、ΔＰの音圧が加わったことになる。Ｖは、上記の
ように外側カップ状本体１と内側カップ状本体２とを相
対回転で調節され、Ｓ、即ちΔＶの変化は、板カム７に
より正確に規定される。従って、マイクロホンＭのダイ
ヤフラムには、任意の大きさの音圧を加えることができ
る。As a result, the sound pressure of ΔP is applied to the diaphragm of the microphone M. V is adjusted by relative rotation of the outer cup-shaped body 1 and the inner cup-shaped body 2 as described above, and the change of S, that is, ΔV is accurately defined by the plate cam 7. Therefore, a sound pressure of arbitrary magnitude can be applied to the diaphragm of the microphone M.
【００１８】このようにしてマイクロホンＭに任意の大
きさの音圧が加えられ、その出力を外部の測定器（図示
しない）で検出することによりその大音圧特性が検測さ
れる。In this way, a sound pressure of arbitrary magnitude is applied to the microphone M, and its large sound pressure characteristic is measured by detecting its output with an external measuring device (not shown).
【００１９】[0019]
【発明の効果】この発明のマイクロホン特性測定・校正
用の大音圧付加装置は、簡便な構造で、調節自在の任意
の音圧を被測定マイクロホンに加えることができ、音圧
は、回転カムの形状で規定され再現性が高い。又、装置
の使用に際し、無響室及び防振・防音設備が必要ではな
い。The high-sound-pressure adding device for measuring and calibrating microphone characteristics of the present invention has a simple structure and can apply an adjustable sound pressure to the microphone to be measured. It is specified by the shape of and has high reproducibility. In addition, an anechoic chamber and anti-vibration / sound-proof equipment are not required when using the device.
【図１】この発明の実施例におけるマイクロホン特性測
定・校正用の大音圧付加装置の断面図である。FIG. 1 is a cross-sectional view of a high sound pressure adding device for measuring and calibrating a microphone characteristic according to an embodiment of the present invention.
１ 外側カップ状本体 ２ 内側カップ状本体 ３ 圧力室 ４，５ ねじ部 ６ 突出部 ７ 板カム ８ カム室 ９ 回転軸 10 シリンダ孔 11 フリーピストン 12 マイクロホン装着孔 13 連通孔 14 段部 15 Ｏリング 1 Outer cup-shaped body 2 Inner cup-shaped body 3 Pressure chamber 4, 5 Screw part 6 Projection part 7 Plate cam 8 Cam chamber 9 Rotating shaft 10 Cylinder hole 11 Free piston 12 Microphone mounting hole 13 Communication hole 14 Step part 15 O-ring
フロントページの続き (72)発明者 三神 圭司 神奈川県横浜市緑区白山１−16−１ 株式 会社小野測器テクニカルセンター内 (72)発明者 池田 忠司 神奈川県横浜市緑区白山１−16−１ 株式 会社小野測器テクニカルセンター内 (72)発明者 山本 拓 神奈川県横浜市緑区白山１−16−１ 株式 会社小野測器テクニカルセンター内 (72)発明者 大橋 正尚 神奈川県横浜市緑区白山１−16−１ 株式 会社小野測器テクニカルセンター内Front Page Continuation (72) Inventor Keiji Mikami 1-16-1 Shirayama, Midori-ku, Yokohama-shi, Kanagawa Ono Sokki Technical Center (72) Inventor Tadashi Ikeda 1-16 Shirayama, Midori-ku, Yokohama-shi, Kanagawa 1 Ono Sokki Technical Center (72) Inventor Taku Yamamoto 1-16-1 Shirayama, Midori-ku, Yokohama-shi, Kanagawa Prefecture Ono Sokki Technical Center (72) Inventor Masahisa Ohashi Shirayama, Midori-ku, Yokohama-shi, Kanagawa 1-16-1 Ono Sokki Technical Center Co., Ltd.
Claims (2)
ング、圧力室に向って開口するシリンダ孔とカム作動で
往復動するピストンから成る圧力室変圧手段、及び圧力
室に面するよう被測定マイクロホンが気密性をもってケ
ーシングに装着されるマイクロホン装着部から構成され
たマイクロホン特性測定・校正用の大音圧付加装置1. A casing defining a pressure chamber whose volume is adjustable, a pressure chamber transforming means including a cylinder hole opening toward the pressure chamber and a piston reciprocating by a cam operation, and a microphone to be measured facing the pressure chamber. A large sound pressure adding device for microphone characteristic measurement and calibration, which consists of a microphone mounting part that is mounted in a casing with airtightness
・間接に螺合されて構成された請求項１に記載のマイク
ロホン特性測定・校正用の大音圧付加装置2. A large sound pressure adding device for microphone characteristic measurement and calibration according to claim 1, wherein the casing is formed by directly and indirectly screwing two cup-shaped main bodies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23086491A JP3000092B2 (en) | 1991-08-19 | 1991-08-19 | Large sound pressure adding device for measuring and calibrating microphone characteristics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23086491A JP3000092B2 (en) | 1991-08-19 | 1991-08-19 | Large sound pressure adding device for measuring and calibrating microphone characteristics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0549097A true JPH0549097A (en) | 1993-02-26 |
| JP3000092B2 JP3000092B2 (en) | 2000-01-17 |
Family
ID=16914505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23086491A Expired - Fee Related JP3000092B2 (en) | 1991-08-19 | 1991-08-19 | Large sound pressure adding device for measuring and calibrating microphone characteristics |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3000092B2 (en) |
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| WO2001025735A1 (en) * | 1999-10-05 | 2001-04-12 | Eads Deutschland Gmbh | Acoustic pressure calibrator |
| JP2001349774A (en) * | 2000-06-08 | 2001-12-21 | Rion Co Ltd | Sound calibrator |
| JP2009260884A (en) * | 2008-04-21 | 2009-11-05 | Nippon Hoso Kyokai <Nhk> | Sensitivity measurement apparatus and measuring method for capacitance type sensor |
| WO2010026724A1 (en) * | 2008-09-04 | 2010-03-11 | ダイトロンテクノロジー株式会社 | Microphone check device and check method |
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1991
- 1991-08-19 JP JP23086491A patent/JP3000092B2/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001025735A1 (en) * | 1999-10-05 | 2001-04-12 | Eads Deutschland Gmbh | Acoustic pressure calibrator |
| US7299676B1 (en) | 1999-10-05 | 2007-11-27 | Eads Deutschland Gmbh | Acoustic pressure calibrator |
| JP2001349774A (en) * | 2000-06-08 | 2001-12-21 | Rion Co Ltd | Sound calibrator |
| JP2009260884A (en) * | 2008-04-21 | 2009-11-05 | Nippon Hoso Kyokai <Nhk> | Sensitivity measurement apparatus and measuring method for capacitance type sensor |
| WO2010026724A1 (en) * | 2008-09-04 | 2010-03-11 | ダイトロンテクノロジー株式会社 | Microphone check device and check method |
| CN101984680A (en) * | 2010-11-10 | 2011-03-09 | 瑞声声学科技(深圳)有限公司 | Test device of pressure microphone and test method thereof |
| CN103702272A (en) * | 2013-12-04 | 2014-04-02 | 浙江大学 | Pistonphone with gap sealing structure and adjusting method thereof |
| CN103702272B (en) * | 2013-12-04 | 2017-04-12 | 浙江大学 | Pistonphone with gap sealing structure and adjusting method thereof |
| CN109672969A (en) * | 2017-10-16 | 2019-04-23 | 四方自动化机械股份有限公司 | Microphone test device |
| CN109672969B (en) * | 2017-10-16 | 2020-07-17 | 四方自动化机械股份有限公司 | Microphone Test Set |
| JP2019122002A (en) * | 2018-01-11 | 2019-07-22 | 株式会社小野測器 | Adapter and sound calibration system |
| CN114710736A (en) * | 2021-12-20 | 2022-07-05 | 杭州爱华仪器有限公司 | Piston sounder |
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|---|---|
| JP3000092B2 (en) | 2000-01-17 |
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