JP2006020247A - Anti-noise microphone - Google Patents

Anti-noise microphone Download PDF

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JP2006020247A
JP2006020247A JP2004198453A JP2004198453A JP2006020247A JP 2006020247 A JP2006020247 A JP 2006020247A JP 2004198453 A JP2004198453 A JP 2004198453A JP 2004198453 A JP2004198453 A JP 2004198453A JP 2006020247 A JP2006020247 A JP 2006020247A
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sound
noise
sound receiving
receiving plate
microphone
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Eizo Kihara
栄造 木原
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Totsu Denshi Kk
東通電子株式会社
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<P>PROBLEM TO BE SOLVED: To provide a bone-conduction microphone which ensures a high-quality communication under high noise even with a simple structure and is available also as a sound pressure type close-talking microphone since there is no projection portion in a sound receiver section. <P>SOLUTION: The anti-noise microphone is provided with: a hollow case 2 made of a material which has a higher acoustic impedance than air and human body and has weight and rigidity for presenting a mechanical impedance that hardly propagates sound vibration; and two sound receiving plates 11, 12 consisting of thin film piezo-film elements arranged compostely with a sealed space between by being supported with confronted two wall parts 2, 3 of the case respectively. In the anti-noise microphone, one sound receiving plate is a sound receiving plate for sound pickup which is supported by one wall part of the case at its outer edge, has an outer face exposed on the outside and receives sound vibration in the state of contacting approximately all the outer face with a sound receiving target, and the other sound receiving plate is a sound receiving plate for touch noise cancel of which an outer face is approximately tightly supported all over an inner wall of the other wall part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、高騒音環境(120dB以上)において通話手段を用いて送信する際の高品質通信を確保するマイクロフォンに関し、特にタッチノイズキャンセル機能を有する骨伝導マイクの改良に関する。   The present invention relates to a microphone that ensures high-quality communication when transmitting using a communication means in a high noise environment (120 dB or more), and more particularly to an improvement of a bone conduction microphone having a touch noise canceling function.
無線機、電話等の通話手段として、さまざまなマイクロフォンが存在するが、例えば、120dB以上の高騒音環境における通話では、使用者の発する音声が騒音に紛れてしまい、送話内容を受話者が聞き取ることができず、会話が欠落する事態が多々生じている。周囲の騒音により通話内容が欠落することにより、特に緊急を要する状況下、人命、その他の安全に関わる状況下、及び人命を預かる業務等に於いては最悪の事故を招く恐れがある。
このような通話内容の欠落を解消、緩和するために、従来から、高騒音環境においても品質の高い通話を可能とする耐騒音マイクが種々提案されている。耐騒音マイクとしては、骨伝導マイク(耳骨マイク、頭骨マイク、鼻骨マイク等)、振動型の咽喉マイク、音圧型の接話マイク等があり、この種のマイクは、騒音の激しい環境(空港滑走路近傍、サーキット場、コンサートホール、イベント会場、船舶等の機関室、工事現場、事故現場等)において、外来騒音を除去し、送話者の音声のみを拾うことによって、品質の高い通話を実現することを目的としている。
振動型の咽頭マイクは、咽頭部の振動を拾って電気信号に変換する手段であり、音圧型の接話マイクは、使用者の口腔等から発せられる音圧を空気伝搬により受音部で直接拾いこれを電気信号に変換する。また、骨伝導マイクは、発声に伴う咽喉部からの骨伝導による振動を直接又は間接的に拾い電気信号に変換するものである。
特開昭63−10998号公報には、小型の圧電素子をオイルが充填された金属容器内に封じ込んだ構造の音声ピックアップ部(加速度センサー方式)を機械インピーダンスの小さいプラスチック等から成る平板に固定し、この平板を通して音声振動をピックアップ部に伝える耐騒音マイクが開示されている。この耐騒音マイクでは、小型の圧電素子をオイル中に浸漬しているため、周囲からの空気伝搬による騒音には圧電素子が反応しにくいという好結果が得られている。
しかしながら、特開昭63−10998号公報に記載の耐騒音マイクは、音声ピックアップ部の構造が精密、複雑であるために製造コストが増大するばかりでなく、ピックアップ部内の圧電素子が小型で薄いため、機械的衝撃を与えないようにする等、取扱いに注意が必要である。また、ピックアップ部を支持する平板は咽喉部の振動に応じて自由に振動、変形する必要があり、音声帯域の振動に対し機械インピーダンスの低い材料で構成する必要がある。このようにピックアップを支持する部材として機械インピーダンスの低い材料を選定せざるを得ないため、マイク本体のどこかに襟、指等の異物が触れて振動が与えられた場合は、これが騒音となってピックアップ部に伝わりやすいという欠点を持っている。
There are various microphones as a means of telephone call for wireless devices, telephones, etc. For example, in a call in a high noise environment of 120 dB or more, the voice uttered by the user is mixed with noise, and the listener listens to the content of the transmission. There are many situations in which conversations are missing. The loss of telephone conversations due to ambient noise can lead to worst accidents, especially in emergency situations, in human life, other safety situations, and in operations that take care of human lives.
In order to eliminate and mitigate such a lack of call content, various noise-resistant microphones that enable high-quality calls even in a high noise environment have been proposed. Noise-resistant microphones include bone conduction microphones (such as earbone microphones, skull microphones, and nasal bone microphones), vibration-type throat microphones, and sound pressure-type close-talking microphones. In the vicinity of the runway, circuit ground, concert hall, event hall, ship engine room, construction site, accident site, etc.) It is intended to be realized.
The vibration type pharyngeal microphone is a means of picking up the vibration of the pharynx and converting it into an electrical signal, and the sound pressure type close-talking microphone directly transmits the sound pressure emitted from the user's oral cavity etc. Pick it up and convert it into an electrical signal. Further, the bone conduction microphone picks up vibrations caused by bone conduction from the throat part due to vocalization directly or indirectly and converts it into an electrical signal.
In Japanese Patent Laid-Open No. 63-10998, a sound pickup unit (acceleration sensor method) having a structure in which a small piezoelectric element is sealed in a metal container filled with oil is fixed to a flat plate made of plastic having a low mechanical impedance. A noise-resistant microphone that transmits voice vibration to the pickup unit through the flat plate is disclosed. In this noise-resistant microphone, since a small piezoelectric element is immersed in oil, a favorable result is obtained that the piezoelectric element hardly reacts to noise caused by air propagation from the surroundings.
However, the noise-resistant microphone described in Japanese Patent Laid-Open No. 63-10998 not only increases the manufacturing cost because the structure of the voice pickup unit is precise and complicated, but also the piezoelectric element in the pickup unit is small and thin. Care should be taken in handling such as avoiding mechanical shock. In addition, the flat plate that supports the pickup section needs to be freely vibrated and deformed in accordance with the vibration of the throat, and must be made of a material having a low mechanical impedance with respect to vibration in the voice band. In this way, a material with low mechanical impedance must be selected as a member to support the pickup, so if a foreign object such as a collar or a finger touches the body of the microphone somewhere, it will be noisy. Has the disadvantage of being easily transmitted to the pickup section.
さらに、特開平8−33073号公報には、ケース内に平行且つ離間した状態で配置された2枚の圧電素子に伝搬されたタッチノイズ信号出力を逆相接続して、タッチノイズのみをキャンセルさせる方式の振動ピックアップマイクロホンが開示されているが、どちらの圧電素子も浮いた状態で支持されている為、音声もタッチノイズ等の騒音もほとんど同レベルで圧電素子を振動させることになる。しかし、このままの構成で両圧電素子を逆相接続した場合には、騒音のみならず、ピックアップしたい音声信号もキャンセルされてしまうので、片方の圧電素子に適当な重量のおもりを付けて、音声帯域の振動周波数には反応しにくくし、タッチノイズなどパルス性の振動には反応しやすくして解決している。しかしながらこの方式では、音声帯域内に広く分布しているジェット音等のホワイトノイズ性の騒音に対しては効果が低い。
また、特開平10−79999号公報には、圧電素子の振動板に咽頭当て片を設け、その当て片を通して咽喉部からの振動をピックアップする圧電型咽喉マイクが開示されている。同公報には、耐騒音性について言及されていないが、音圧型マイクとしても転用できる可能性がある。しかし、この圧電型咽頭マイクを音圧型マイクとして転用する場合、当て片が突出しているため咽喉マイクとして使用した時、咽喉部との間に隙間ができ周囲の騒音、風切り音を拾ってしまう欠点を持っている。
特開昭63−10998号公報 特開平8−33073号公報 特開平10−79999号公報
Further, Japanese Patent Laid-Open No. 8-33073 discloses that the touch noise signal output propagated to two piezoelectric elements arranged in parallel and spaced apart in the case is connected in reverse phase to cancel only the touch noise. Although a vibration pickup microphone of the type is disclosed, since both piezoelectric elements are supported in a floating state, the piezoelectric elements are vibrated at almost the same level of sound and noise such as touch noise. However, if both piezoelectric elements are connected in reverse phase with this configuration, not only noise but also the audio signal to be picked up will be canceled. This makes it difficult to react to the vibration frequency of and to react easily to pulsed vibrations such as touch noise. However, this method is less effective for white noise noise such as jet sound that is widely distributed in the voice band.
Japanese Patent Application Laid-Open No. 10-79999 discloses a piezoelectric throat microphone in which a pharyngeal contact piece is provided on a diaphragm of a piezoelectric element, and vibration from the throat is picked up through the contact piece. Although the publication does not mention noise resistance, it may be diverted as a sound pressure type microphone. However, when this piezoelectric pharyngeal microphone is diverted as a sound pressure type microphone, there is a gap between the throat and the surrounding noise and wind noise that can be picked up when it is used as a throat microphone because the contact piece protrudes. have.
JP-A 63-10998 JP-A-8-33073 Japanese Patent Laid-Open No. 10-79999
本発明は上記に鑑みてなされたものであり、簡単な構造でありながら、高騒音下の通信を高品質で確保することができ、受音部に突出部が存在しないために音圧型の接話マイクとしても併用できる骨伝導マイクを提供することにある。   The present invention has been made in view of the above, and although it has a simple structure, communication under high noise can be ensured with high quality, and since there is no protruding portion in the sound receiving portion, the sound pressure type contact is achieved. The object is to provide a bone conduction microphone that can also be used as a talk microphone.
上記課題を解決するために、請求項1の発明は、空気、及び人体よりも高い音響インピーダンスを有し、かつ音声振動を伝搬しにくい機械インピーダンスを発揮する重量、剛性を有した材料から成る中空のケースと、該ケースの対向する2つの壁部により夫々支持されることにより密閉空間を挟んで対向配置された薄膜ピエゾフィルム素子から成る2枚の受音板と、を備えた耐騒音マイクにおいて、一方の受音板は、外周縁をケースの一方の壁部により支持されると共に外部に露出した外面を有し、該外面のほぼ全面を受音対象物と接触させた状態で音声振動を受音する音声ピックアップ用の受音板であり、他方の受音板は、他方の壁部の内壁に外面をほぼ全面的に密着支持されたタッチノイズキャンセル用の受音板であることを特徴とする。
請求項2の発明は、前記2枚の受音板からの各出力を直列接続して各出力中に含まれる騒音成分のみを減算させた上で、インピーダンス変換回路に入力する構成を備えたことを特徴とする。
In order to solve the above-mentioned problems, the invention of claim 1 is a hollow made of a material having weight and rigidity that exhibits mechanical impedance higher than that of air and a human body and that hardly propagates sound vibration. And a two sound receiving plates made of thin film piezo film elements arranged to face each other across a sealed space by being supported by two opposing wall portions of the case. One sound receiving plate has an outer surface whose outer peripheral edge is supported by one wall portion of the case and exposed to the outside, and performs sound vibration in a state where almost the entire outer surface is in contact with the sound receiving object. A sound receiving plate for sound pickup for receiving sound, wherein the other sound receiving plate is a sound receiving plate for touch noise cancellation in which the outer surface is substantially closely supported by the inner wall of the other wall portion. Be
The invention of claim 2 has a configuration in which the outputs from the two sound receiving plates are connected in series and only the noise component contained in each output is subtracted and then input to the impedance conversion circuit. It is characterized by.
本発明の耐騒音マイクは、空気中からの音声帯域信号の伝搬に対し充分大きな音響インピーダンスを持ち、かつ人体が動くことにより生ずる生活振動や音声帯域の振動に追従しにくい重量(機械インピーダンス)を持った金属等の材質で構成されたマイク素子収納部とし、またマイク素子(受音板)として薄膜ピエゾフィルム素子2枚を使用し、1枚の素子全面で音声の振動と騒音を、片方の素子でケース本体に伝搬した騒音成分のみを夫々ピックアップするように配置した構造を特徴とする。
更に、各マイク素子からの出力中の騒音成分のみを減算することにより、騒音信号を低減し音声信号のみを取り出す。
マイク素子収納部としてのケースの材料及び構造による耐騒音性強化とマイク素子の電気的な耐騒音性強化により、120dBを超える騒音下でも高品質の通話を提供する。
The noise-resistant microphone of the present invention has a weight (mechanical impedance) that has a sufficiently large acoustic impedance with respect to the propagation of a voice band signal from the air and that does not easily follow a life vibration or a voice band vibration caused by the movement of a human body. The microphone element housing is made of a material such as metal, and two thin-film piezo film elements are used as the microphone element (sound receiving plate). It is characterized by a structure in which only noise components propagated to the case body by the element are picked up.
Further, by subtracting only the noise component in the output from each microphone element, the noise signal is reduced and only the voice signal is extracted.
By enhancing the noise resistance by the material and structure of the case as the microphone element storage and enhancing the electric noise resistance of the microphone element, a high quality call can be provided even under a noise exceeding 120 dB.
以下、本発明の実施の形態を図1、図2に基づいて説明する。
図1は本発明の一実施形態に係る耐騒音マイクの使用状態を示す縦断面図であり、図2は耐騒音マイクを受音面側から見た横断面図である。
この耐騒音マイク1は、空気、及び人体よりも高い音響インピーダンスを有し、かつ音声帯域の振動を伝搬しにくい高い機械インピーダンスを発揮する重量、剛性を有した材料から成る中空のケース2と、中空のケース2の対向する2つの壁部3、4により夫々支持されることにより密閉空間S(幅1.5mm程度)を挟んで対向配置された薄膜ピエゾフィルム素子から成る2枚の受音板11、12と、を備えている。
耐騒音マイク1は、マイク保持部(ネックストラップ等)、15によって支持されている。
ケース2の中空内部は、略中央部に設けた隔壁5によって2つの空所S1、S2に区画されている。空所S2内には、インピーダンス変換回路20が収容されており、各受音板11、12の出力は、インピーダンス変換回路20に入力されるようにリード線21によって結線されている。
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 is a longitudinal sectional view showing a usage state of a noise-resistant microphone according to an embodiment of the present invention, and FIG. 2 is a transverse sectional view of the noise-resistant microphone viewed from the sound receiving surface side.
This noise-resistant microphone 1 has a hollow case 2 made of a material having weight and rigidity, which has a higher acoustic impedance than air and a human body, and exhibits a high mechanical impedance that hardly propagates vibrations in the voice band, Two sound receiving plates comprising thin film piezo film elements arranged to face each other with a sealed space S (width of about 1.5 mm) supported by two opposing walls 3 and 4 of the hollow case 2 respectively. 11 and 12.
The noise-resistant microphone 1 is supported by a microphone holding portion (such as a neck strap) 15.
The hollow interior of the case 2 is partitioned into two cavities S1 and S2 by a partition wall 5 provided substantially at the center. An impedance conversion circuit 20 is accommodated in the space S <b> 2, and outputs of the sound receiving plates 11 and 12 are connected by lead wires 21 so as to be input to the impedance conversion circuit 20.
受音板11、12の大半の部分は、何れも主として密閉された空所S1側に位置しており、夫々の一端部が他方の空所S2側に延長されてインピーダンス変換回路20と電気的に接続されている。
ケース2の一方の壁部3により支持された受音板11は、その外周縁を壁部3により支持されており、外面のほぼ全体は外部に露出している。受音板11の中心部を含んだ広い領域は自由振動できるように構成されている。この受音板11は、その外面を咽頭部等の人体皮膚(受音対象物)30に密着させることにより音声振動を受音する音声ピックアップ用の受音板である。
他方の受音板12は、他方の厚肉の壁部4の内壁に外面をほぼ全面的に密着支持されたタッチノイズキャンセル用の受音板であり、保持具15、ケース2に伝搬した騒音をピックアップする。
薄膜ピエゾフィルム素子から成る受音板11及び12を収容、支持するケース2は、人体が動くことにより生ずる生活振動(タッチノイズ)から音声帯域(5Hz〜4kHz程度)に至る範囲の帯域の振動に対して充分に高い機械インピーダンスを発揮し得る重量(30〜40g程度)を有し、かつ空気(0.0004kg×10/m・S)、及び人体に対して充分大きな音響インピーダンスを有する真鍮(40.4kg×10/m・S)等の金属材料から構成されている。
ケース2を構成する材料は、人体30よりも音響インピーダンスが大きくなるように設定されているため、人体30からの生活振動はケース2に伝わりにくい。一方、壁部2と接触する外周縁部を介して僅かに受音板11に伝搬した生活振動成分は、受音板11が薄膜ピエゾフィルム素子であるため、人体の音声インピーダンスに近く、また受音板全面が人体に密着しているため、人体側に吸収されやすくなる。なお、空間に浮いている状態にある受音板11の受音面は、人体から発せられた音声により自由に振動することができる。
Most portions of the sound receiving plates 11 and 12 are mainly located on the sealed space S1 side, and one end of each is extended to the other space S2 side to be electrically connected to the impedance conversion circuit 20. It is connected to the.
The sound receiving plate 11 supported by one wall portion 3 of the case 2 is supported by the wall portion 3 at the outer peripheral edge, and almost the entire outer surface is exposed to the outside. A wide region including the central portion of the sound receiving plate 11 is configured to be able to freely vibrate. The sound receiving plate 11 is a sound receiving plate for a sound pickup that receives sound vibration by bringing its outer surface into close contact with human skin (sound receiving object) 30 such as the pharynx.
The other sound receiving plate 12 is a touch noise canceling sound receiving plate whose outer surface is almost closely supported by the inner wall of the other thick wall portion 4, and the noise propagated to the holder 15 and the case 2. To pick up.
The case 2 that houses and supports the sound receiving plates 11 and 12 made of thin-film piezo film elements is capable of handling vibrations in a band ranging from life vibrations (touch noise) caused by the movement of the human body to voice bands (about 5 Hz to 4 kHz). Brass that has a sufficiently high mechanical impedance (about 30 to 40 g) and has a sufficiently large acoustic impedance to air (0.0004 kg × 10 6 / m 2 · S) and the human body It is comprised from metal materials, such as (40.4kg * 10 < 6 > / m < 2 > * S).
Since the material constituting the case 2 is set so that the acoustic impedance is larger than that of the human body 30, life vibrations from the human body 30 are not easily transmitted to the case 2. On the other hand, the life vibration component slightly propagated to the sound receiving plate 11 through the outer peripheral edge in contact with the wall portion 2 is close to the sound impedance of the human body because the sound receiving plate 11 is a thin film piezo film element. Since the entire sound board is in close contact with the human body, it is easily absorbed by the human body. Note that the sound receiving surface of the sound receiving plate 11 in a floating state can freely vibrate by the sound emitted from the human body.
他方の受音板12は、その外面のほぼ全体が他方の壁部4に密着固定されており、さらに受音板11との間には空間S1が存在するために、受音板11からの振動は受音板12には伝わりにくい。
一方、外部空気中から伝搬する音声帯域の外来振動は、音響インピーダンスが充分大きい物質であるケース2に到達すると反射、或いは減衰し、ケースを構成する壁部4に取り付けられた受音板12は振動しにくくなる。また、ケース2、マイク保持具15に衣類等が触れた時の振動は、ケース2の重量を重くすることにより減衰でき、受音板12を振動させにくくなる。
さらに薄膜ピエゾフィルム素子から成る各受音板から出力される電気信号を適当な信号量にして電気的に減算することにより、騒音のみが低減され音声信号のみが出力される。
このように本発明によれば、空気中からの音声帯域振動の伝搬に対し充分大きな音響インピーダンスを持ち、かつ人体が動くことにより生ずる生活振動や音声帯域の振動に追従しにくい重量(機械インピーダンス)を持った金属等の材質で構成されたケースにより受音板を支持、収納し、また受音板として薄膜ピエゾフィルム素子2枚を使用し、1枚の素子全面で音声の振動と騒音を、片方の素子で収納部本体に伝搬した騒音のみを夫々ピックアップするように配置したので、充分な耐騒音性を得ることができる。即ち、単に、各受音板11、12からの出力を夫々インピーダンス変換回路に出力することにより音声ピックアップ用の受音板11からの音声信号を得ることができる。
Since the other sound receiving plate 12 is almost fixed to the other wall portion 4 in close contact with the other wall portion 4, and there is a space S 1 between the sound receiving plate 11 and the sound receiving plate 11. The vibration is not easily transmitted to the sound receiving plate 12.
On the other hand, the external vibration in the voice band propagating from the outside air is reflected or attenuated when reaching the case 2 which is a substance having a sufficiently large acoustic impedance, and the sound receiving plate 12 attached to the wall portion 4 constituting the case is It becomes difficult to vibrate. In addition, vibration when clothing or the like touches the case 2 and the microphone holder 15 can be attenuated by increasing the weight of the case 2, and the sound receiving plate 12 is hardly vibrated.
Furthermore, by electrically subtracting the electric signal output from each sound receiving plate made of a thin film piezo film element to an appropriate signal amount, only noise is reduced and only the audio signal is output.
As described above, according to the present invention, the weight (mechanical impedance) has a sufficiently large acoustic impedance for the propagation of the voice band vibration from the air and does not easily follow the life vibration or the voice band vibration caused by the movement of the human body. The sound receiving plate is supported and housed by a case made of a material such as a metal with a ring, and two thin film piezo film elements are used as the sound receiving plate. Since only one of the noises propagated to the storage unit main body is picked up by one element, sufficient noise resistance can be obtained. That is, simply by outputting the outputs from the sound receiving plates 11 and 12 to the impedance conversion circuit, the sound signal from the sound receiving plate 11 for the sound pickup can be obtained.
次に、本発明の他の実施形態では、更に耐騒音性を上げるために、受音板11と受音板12からの各出力信号を直列に接続して減算させた上でインピーダンス変換回路20に入力する。
人体30から発せられるほとんどの音声振動は、受音板11により受音されるため、両受音板11、12により夫々ピックアップされた騒音のみがキャンセルされ、マイク出力25には通話に必要な人体30からの音声信号のみが出力されることとなる。
ここで、両受音板11、12からの各出力信号を直列に接続して騒音のみを減算させる点について説明する。
即ち、受音板12はその周縁部が壁部4に固定され、その中央部分は壁部4の内部底面に密着している。これに対して、受音板11は周縁部が壁部3に固定され、自由に振動できる中央部分は人体30に密着固定された状態にある。ここで、外部からケース2に対して騒音が伝搬したとき、受音板11の人体30に密着している中央部分が騒音により振動した場合の振動成分は人体30に吸収され、密着していない周縁部の一部が主に振動する。同様に外部から騒音が伝搬したとき、受音板12の壁部4に密着している素子膜の動きは制限され、密着していない周縁部の一部が主に振動する。
従って、両受音板11、12の騒音に対する振動量は同程度になるので、両受音板11、12を構成する薄膜ピエゾフィルム素子の+極、−極のいずれかの同極同士を直列接続すれば、騒音成分のみを減算できることになり、別に加減算回路を設ける必要はなく、インピーダンス変換のみの簡単な回路20で通常の騒音のみならず、ジェット音等のホワイトノイズ性の騒音に対してもこれをキャンセルする機能を実現することができる。
Next, in another embodiment of the present invention, in order to further improve noise resistance, the output signals from the sound receiving plate 11 and the sound receiving plate 12 are connected in series and subtracted, and then the impedance conversion circuit 20. To enter.
Since most sound vibrations emitted from the human body 30 are received by the sound receiving plate 11, only the noise picked up by the sound receiving plates 11 and 12 is canceled, and the microphone output 25 has a human body necessary for a call. Only the audio signal from 30 is output.
Here, the point which connects each output signal from both the sound receiving plates 11 and 12 in series, and subtracts only noise is demonstrated.
That is, the periphery of the sound receiving plate 12 is fixed to the wall portion 4, and the central portion thereof is in close contact with the inner bottom surface of the wall portion 4. In contrast, the sound receiving plate 11 has a peripheral portion fixed to the wall portion 3 and a central portion that can freely vibrate is in close contact with the human body 30. Here, when noise propagates from the outside to the case 2, the vibration component when the central portion of the sound receiving plate 11 in close contact with the human body 30 vibrates due to noise is absorbed by the human body 30 and is not in close contact. A part of the peripheral part mainly vibrates. Similarly, when noise propagates from the outside, the movement of the element film that is in close contact with the wall portion 4 of the sound receiving plate 12 is limited, and a part of the peripheral portion that is not in close contact mainly vibrates.
Accordingly, since the vibration amounts of the sound receiving plates 11 and 12 with respect to the noise are substantially the same, any of the positive poles and the negative poles of the thin film piezoelectric film elements constituting the sound receiving plates 11 and 12 are connected in series. If connected, only the noise component can be subtracted, and it is not necessary to provide a separate addition / subtraction circuit. With a simple circuit 20 that only performs impedance conversion, not only ordinary noise but also white noise noise such as jet noise can be obtained. Also, a function for canceling this can be realized.
以上の如き構成を備えた本発明の耐騒音マイクによれば、以下の如き効果を奏することができる。
(1)簡単な構造でありながら、120dBを超える騒音の激しい場所(空港滑走路近傍、ジェットエンジン近傍、サーキット場、コンサートホール、イベント会場、船舶等の機関室、工事現場等)での使用に際しても、品質の高い通信が確保できる。
(2)突出物のない薄型のケース内に素子を収容したシンプルな外観形状であるため、マイクロフォン全体を薄いゴム材等でコーティングすることも容易であり、高い防水性を確保することができる。
(3)使用時は受音部11が人体30により完全に覆われるため、風切り音が発生しにくい。
(4)音声帯域の振動に対し機械インピーダンスの大きな材質から成るケースにより素子を支持、収納するように構成したので、使用者が被着する衣類の襟等による摩擦音が伝搬しにくいため、動きの激しい作業環境でも高品質の通話が確保できる。
(5)音声信号(振動)の受音板を薄膜ピエゾフィルム素子全面(平面)としたことで、音圧型の接話マイクとしても併用できる。
(6)耐騒音性を有しない通常のマイクロフォン並の薄さにすることが可能なため、装着性に違和感が少なくなる。
According to the noise-resistant microphone of the present invention having the above-described configuration, the following effects can be achieved.
(1) Although it is a simple structure, it can be used in places with a lot of noise exceeding 120 dB (near airport runways, jet engines, circuit fields, concert halls, event venues, ship engine rooms, construction sites, etc.) However, high quality communication can be secured.
(2) Since the device has a simple external shape in which a device is accommodated in a thin case without protrusions, it is easy to coat the entire microphone with a thin rubber material or the like, and high waterproofness can be secured.
(3) Since the sound receiving unit 11 is completely covered by the human body 30 during use, wind noise is unlikely to occur.
(4) Since the element is supported and housed by a case made of a material having a large mechanical impedance against vibrations in the voice band, the frictional sound caused by the collar of clothing worn by the user is difficult to propagate. High-quality calls can be secured even in harsh working environments.
(5) Since the sound signal (vibration) sound receiving plate is the entire surface (plane) of the thin film piezo film element, it can also be used as a sound pressure type close-talking microphone.
(6) Since it can be made as thin as a normal microphone having no noise resistance, the feeling of discomfort is reduced.
本発明の実施形態を示す耐騒音マイクの縦断面図。The longitudinal cross-sectional view of the noise-proof microphone which shows embodiment of this invention. 耐騒音マイクの受音面から見た横断面図。The cross-sectional view seen from the sound-receiving surface of the noise-resistant microphone.
符号の説明Explanation of symbols
1 耐騒音マイク、2 ケース、3、4 壁部、5 隔壁、S 密閉空間、11、12 受音板、15 マイク保持具(ネックストラップ等)、 20 インピーダンス変換回路(電子回路)、30 人体(受音対象物) DESCRIPTION OF SYMBOLS 1 Noise-resistant microphone, 2 case, 3, 4 wall part, 5 partition, S sealed space, 11, 12 sound receiving plate, 15 microphone holder (neck strap etc.), 20 impedance conversion circuit (electronic circuit), 30 human body ( Sound receiving object)

Claims (2)

  1. 空気、及び人体よりも高い音響インピーダンスを有し、かつ音声振動を伝搬しにくい機械インピーダンスを発揮する重量、剛性を有した材料から成る中空のケースと、該ケースの対向する2つの壁部により夫々支持されることにより密閉空間を挟んで対向配置された薄膜ピエゾフィルム素子から成る2枚の受音板と、を備えた耐騒音マイクにおいて、
    一方の受音板は、外周縁をケースの一方の壁部により支持されると共に外部に露出した外面を有し、該外面のほぼ全面を受音対象物と接触させた状態で音声振動を受音する音声ピックアップ用の受音板であり、
    他方の受音板は、他方の壁部の内壁に外面をほぼ全面的に密着支持されたタッチノイズキャンセル用の受音板であることを特徴とする耐騒音マイク。
    A hollow case made of a material having weight and rigidity that exhibits a mechanical impedance that has higher acoustic impedance than air and a human body and that hardly propagates sound vibrations, and two opposing wall portions of the case In a noise-resistant microphone comprising two sound receiving plates made of thin-film piezo film elements arranged to face each other with a sealed space interposed therebetween,
    One sound receiving plate has an outer surface whose outer peripheral edge is supported by one wall portion of the case and exposed to the outside, and receives sound vibration in a state where almost the entire outer surface is in contact with the sound receiving object. It is a sound receiving plate for sound pickup that sounds,
    The other sound receiving plate is a touch noise canceling sound receiving plate whose outer surface is substantially closely supported by the inner wall of the other wall portion.
  2. 前記2枚の受音板からの各出力を直列接続して各出力中に含まれる騒音成分のみを減算させた上で、インピーダンス変換回路に入力する構成を備えたことを特徴とする請求項1に記載の耐騒音マイク。
    The output from the two sound receiving plates is connected in series so that only the noise component contained in each output is subtracted and then input to the impedance conversion circuit. Noise-resistant microphone as described in
JP2004198453A 2004-07-05 2004-07-05 Anti-noise microphone Pending JP2006020247A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008105180A1 (en) 2007-02-28 2008-09-04 Temco Japan Co., Ltd. Vibration pickup microphone
WO2009098888A1 (en) 2008-02-08 2009-08-13 Temco Japan Co., Ltd. Vibration pickup microphone
CN103096225A (en) * 2011-11-03 2013-05-08 北京美尔斯通科技发展股份有限公司 Bone conduction microphone

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58162192A (en) * 1982-03-20 1983-09-26 Takeshi Yoshii Calling device of vibrating pickup
JPH032794U (en) * 1989-05-30 1991-01-11
JPH0833073A (en) * 1994-07-20 1996-02-02 Atsuden Kk Vibration pickup microphone

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58162192A (en) * 1982-03-20 1983-09-26 Takeshi Yoshii Calling device of vibrating pickup
JPH032794U (en) * 1989-05-30 1991-01-11
JPH0833073A (en) * 1994-07-20 1996-02-02 Atsuden Kk Vibration pickup microphone

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008105180A1 (en) 2007-02-28 2008-09-04 Temco Japan Co., Ltd. Vibration pickup microphone
WO2009098888A1 (en) 2008-02-08 2009-08-13 Temco Japan Co., Ltd. Vibration pickup microphone
CN103096225A (en) * 2011-11-03 2013-05-08 北京美尔斯通科技发展股份有限公司 Bone conduction microphone
CN103096225B (en) * 2011-11-03 2018-05-18 北京美尔斯通科技发展股份有限公司 Bone-conduction microphone

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