JPH10268873A - Soundproof wall with active noise controller - Google Patents
Soundproof wall with active noise controllerInfo
- Publication number
- JPH10268873A JPH10268873A JP9073061A JP7306197A JPH10268873A JP H10268873 A JPH10268873 A JP H10268873A JP 9073061 A JP9073061 A JP 9073061A JP 7306197 A JP7306197 A JP 7306197A JP H10268873 A JPH10268873 A JP H10268873A
- Authority
- JP
- Japan
- Prior art keywords
- sound
- soundproof wall
- noise
- wall
- sound wave
- 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
Landscapes
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
- Building Environments (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、道路走行中の自動
車などの複数音源に対する防音装置に係り、特に道路騒
音に対して有効な能動騒音制御を行うための防音壁に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproofing device for a plurality of sound sources such as an automobile running on a road, and more particularly to a soundproofing wall for performing active noise control effective for road noise.
【０００２】[0002]
【従来の技術】従来の能動騒音制御装置付き防音壁はい
くつかの提案がなされており、その一例としては特公平
７―８２３４７号公報に開示されている。これに開示さ
れている防音壁は、騒音源からの入射音波を検出するリ
ファレンスマイクロホンと、入射波と同振幅・逆位相の
付加音を発生させるスピーカを、防音壁よりも音源側に
設け、さらに消音効果を確認するエラーマイクを防音壁
の上端エッジ部に設けることにより、防音壁の裏側の広
い範囲での騒音低減を期待するものである。2. Description of the Related Art There have been several proposals for a conventional noise barrier with an active noise control device, an example of which is disclosed in Japanese Patent Publication No. 7-82347. The soundproof wall disclosed therein includes a reference microphone that detects an incident sound wave from a noise source, and a speaker that generates an additional sound having the same amplitude and opposite phase as the incident wave, provided on the sound source side of the soundproof wall, By providing an error microphone for confirming the sound deadening effect at the upper edge of the soundproof wall, noise reduction over a wide area behind the soundproof wall is expected.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の能動騒音制御装置付き防音壁では以下の課題
があった。図３に従来の防音壁の構成を示す。図でＳ１
のみが騒音減であるときには、防音壁４の音源側の騒音
検知用のリファレンスマイクＡへの入射音波１１を用い
て、消音効果を確認するエラーマイクＢの位置でＳ１か
らの音波２１と逆位相の波をつくるため、点ＡおよびＢ
までの伝達経路２１と１１の距離の差などに対応する遅
れ時間差と伝達特性差を補正する伝達特性補正回路５２
にて補正し、逆位相処理回路５３で行いスピーカＤより
音波を放出すれば、点Ｂでの騒音を低減可能である。一
方、高速道路や鉄道に従来の能動騒音制御装置を適用す
る場合には、図のＳ１とＳ２のような異なる位置の複数
の騒音源に対して同時に対応することも必要である。こ
のとき、防音壁４の音源側の騒音検知用のリファレンス
マイクＡでは入射音波１１、１２が合成された音を用い
て、消音効果を確認するエラーマイクＢの位置でＳ１お
よびＳ２からの音波２１、２２と逆位相の波をつくるこ
とが必要である。しかし、Ｓ１もしくはＳ２から点Ａお
よびＢまでの伝達経路２１と１１もしくは２２と１２の
遅れ時間差は、Ｓ１とＳ２について一般には同一ではな
いので、Ｓ１とＳ２からの音波が合成された状態では伝
達特性補正回路５２で一律の遅れ時間差などの補正はで
きず、結果としてエラーマイク位置Ｂでの騒音を低減で
きないという問題点があった。However, such a conventional noise barrier with an active noise control device has the following problems. FIG. 3 shows the configuration of a conventional soundproof wall. In the figure, S1
When only the noise is reduced, the sound wave 11 incident on the reference microphone A for noise detection on the sound source side of the soundproof wall 4 is used, and a phase opposite to the sound wave 21 from S1 is detected at the position of the error microphone B for confirming the muffling effect. Points A and B to create a wave
Transfer characteristic correction circuit 52 for correcting a delay time difference and a transfer characteristic difference corresponding to a difference in the distance between the transfer paths 21 and 11 to the transfer path and the like.
When the sound is emitted from the speaker D by performing the correction in the anti-phase processing circuit 53, the noise at the point B can be reduced. On the other hand, when a conventional active noise control device is applied to an expressway or a railway, it is necessary to simultaneously deal with a plurality of noise sources at different positions such as S1 and S2 in the figure. At this time, the reference microphone A for noise detection on the sound source side of the sound-insulating wall 4 uses the sound obtained by combining the incident sound waves 11 and 12 with the sound waves 21 from S1 and S2 at the position of the error microphone B for confirming the sound-muffling effect. , 22 need to be generated. However, since the delay time difference between the transmission paths 21 and 11 or 22 and 12 from S1 or S2 to points A and B is not generally the same for S1 and S2, the transmission is not possible when the sound waves from S1 and S2 are combined. There is a problem that the characteristic correction circuit 52 cannot correct a uniform delay time difference or the like, and as a result, noise at the error microphone position B cannot be reduced.
【０００４】本発明は、このような点に着目した改善し
たものであり、その目的は、音源が複数個ある場合でも
効果的に騒音を低減可能な能動騒音制御装置付き防音壁
を提供することである。[0004] The present invention is an improvement focused on such a point, and an object thereof is to provide a soundproof wall with an active noise control device capable of effectively reducing noise even when there are a plurality of sound sources. It is.
【０００５】[0005]
【課題を解決するための手段】前記目的を達成するため
に、本発明は、能動騒音制御装置を構成する前記のリフ
ァレンスマイクロホンとスピーカとエラーマイクロホン
を、騒音の伝播方向と交差する２つの防音壁を設けて、
２つの防音壁のうち音源側の第１の防音壁の上端エッジ
に騒音を検出するリファレンスマイクロホン、もう一方
の第２の防音壁の上端エッジに消音効果を確認するエラ
ーマイクロホンを設け、これら２つのマイクロホンの間
にスピーカを配置することを特徴とする。In order to achieve the above object, the present invention provides an active noise control device in which the reference microphone, the speaker and the error microphone are connected to two soundproof walls intersecting the noise propagation direction. With
Of the two soundproof walls, a reference microphone for detecting noise is provided at the upper end edge of the first soundproof wall on the sound source side, and an error microphone for confirming the sound deadening effect is provided at the upper end edge of the other second soundproof wall. A speaker is arranged between the microphones.
【０００６】さらに、防音壁に沿って、能動騒音制御装
置を複数組配置し、前記のリファレンスマイクロホンと
スピーカとエラーマイクロホンを、互いに、分離壁で仕
切ることも特徴とする。Further, a plurality of sets of active noise control devices are arranged along the soundproof wall, and the reference microphone, the speaker and the error microphone are separated from each other by a separating wall.
【０００７】さらに、道路や鉄道のように防音壁と略平
行に直線的な移動を行う騒音源に対し、騒音情報を検出
するリファレンスマイクロホンに騒音源の移動方向を含
む面内に指向性を持つことを特徴とする。Further, for a noise source that moves linearly substantially in parallel with a sound barrier, such as a road or a railway, a reference microphone that detects noise information has directivity in a plane including the moving direction of the noise source. It is characterized by the following.
【０００８】[0008]
【発明の実施の形態】本発明の第１の実施例を図１、図
２および図４に基づいて説明する。ここで図１は本発明
の能動騒音制御装置付き防音壁の１実施例を示す垂直断
面図である。図２は防音壁における遮音の原理を説明す
るホイヘンスの原理を示す垂直断面図である。図４は本
発明の一実施例を示す斜視図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. Here, FIG. 1 is a vertical sectional view showing one embodiment of a soundproof wall with an active noise control device of the present invention. FIG. 2 is a vertical cross-sectional view illustrating the principle of Huygens explaining the principle of sound insulation in the soundproof wall. FIG. 4 is a perspective view showing one embodiment of the present invention.
【０００９】図１で防音壁４の上端部は２ヶ所のエッジ
４３、４４がありそれぞれの上端部近傍に騒音を検出す
る第１の検出手段であるリファレンスマイクＡと消音効
果を確認する第２の検出手段であるエラーマイクＢを設
置し、さらにこれらの間に付加音発生手段であるスピー
カＤを設置し、リファレンスマイクＡで検出した音波が
エラーマイクＢの位置に伝播する音波３０と同振幅・逆
位相の音波となるようにリファレンスマイクＡで検出し
た音波を低域通過フィルタＬＰＦを介してＡ／Ｄ変換し
たのち伝達特性補正回路５２と逆位相処理回路５３を経
由し、Ｄ／Ａ変換後、アンプを介してスピーカＤより放
射させる。スピーカＤは、放射される音が直接防音壁の
外側に放射されないように、リファレンスマイクＡとエ
ラーマイクＢを結ぶ直線よりも低い位置に設置してもよ
い。In FIG. 1, the upper end of the sound-insulating wall 4 has two edges 43 and 44, and a reference microphone A as first detecting means for detecting noise near each upper end thereof and a second for confirming a noise-eliminating effect. An error microphone B as a detecting means is installed, and a speaker D as an additional sound generating means is installed between them. The sound wave detected by the reference microphone A has the same amplitude as the sound wave 30 propagating to the position of the error microphone B. A / D conversion of a sound wave detected by the reference microphone A via the low-pass filter LPF so that the sound wave becomes an anti-phase sound wave, and then D / A conversion via the transfer characteristic correction circuit 52 and the anti-phase processing circuit 53 Then, the light is radiated from the speaker D via the amplifier. The loudspeaker D may be installed at a position lower than a straight line connecting the reference microphone A and the error microphone B so that the radiated sound is not radiated directly to the outside of the soundproof wall.
【００１０】次にリファレンスマイクＡを防音壁の上端
部に設置する効果を図２を用いて説明する。Next, the effect of installing the reference microphone A at the upper end of the soundproof wall will be described with reference to FIG.
【００１１】図２において点音源Ｓから放射される音波
は、球面状の波面６０を形成する。このとき、波面６０
の上には無数の２次音源６１、６２が形成され、これら
の２次音源から放射される球面波が合成されて新たな球
面状の波面６３が形成される。この波面が防音壁４にぶ
つかると、主として防音壁４の上端エッジ部の２次音源
６２から放射される音波により形成される波面が、防音
壁を回り込み防音壁の裏面の波面６４を形成する。In FIG. 2, sound waves radiated from a point sound source S form a spherical wavefront 60. At this time, the wavefront 60
The infinite number of secondary sound sources 61 and 62 are formed on the above, and spherical waves radiated from these secondary sound sources are combined to form a new spherical wavefront 63. When this wavefront hits the soundproof wall 4, the wavefront mainly formed by sound waves radiated from the secondary sound source 62 at the upper edge of the soundproof wall 4 wraps around the soundproof wall and forms a wavefront 64 on the back surface of the soundproof wall.
【００１２】従って、音源Ｓの位置によらず、防音壁を
回り込む音波は、すべて上端エッジ部の２次音源６２を
介して回り込み、図１に示したように、音源がＳ１、Ｓ
２など複数個あったり、直接防音壁の上端エッジ４３へ
伝達する音波１１、１２の他に、地面の反射波７１、７
２などが存在する場合でも、防音壁の上端エッジ４３の
位置にリファレンスマイクＡを設置すれば防音壁を回り
込むすべての音波が検出可能である。しかも、エラーマ
イクＢも第２のエッジ部４４に設けることにより、リフ
ァレンスマイクＡよりエラーマイクＢへの伝播する音波
３０の伝播経路は音源Ｓ１やＳ２の位置によらず一定で
ある。しかもエラーマイクＢは防音壁の上端エッジ部４
４にあるため、本発明によりエッジ部４４での音圧が音
源の数によらず低減され、防音壁の背面に回り込むすべ
ての音波３１、３２が減音可能である。Therefore, irrespective of the position of the sound source S, all sound waves circling the soundproof wall wrap around via the secondary sound source 62 at the upper edge, and as shown in FIG.
2 and sound waves 11 and 12 transmitted directly to the upper edge 43 of the soundproof wall, and reflected waves 71 and 7 on the ground.
Even when the sound barrier 2 exists, if the reference microphone A is installed at the position of the upper edge 43 of the soundproof wall, all the sound waves that go around the soundproof wall can be detected. Moreover, since the error microphone B is also provided at the second edge portion 44, the propagation path of the sound wave 30 propagating from the reference microphone A to the error microphone B is constant regardless of the positions of the sound sources S1 and S2. Moreover, the error microphone B is located at the upper edge 4 of the soundproof wall.
4, the sound pressure at the edge portion 44 is reduced irrespective of the number of sound sources according to the present invention, and all the sound waves 31 and 32 circling to the back of the soundproof wall can be reduced.
【００１３】また、道路や鉄道など音源となる自動車や
電車が移動する場合には、図４に示したように、複数の
リファレンスマイクＡ１、Ａ２およびＡ３とスピーカＤ
１、Ｄ２およびＤ３とエラーマイクＢ１、Ｂ２およびＢ
３を防音壁に沿って複数組み設け、仕切り壁４５で仕切
ることにより、自動車Ｓ３などの移動音源からリファレ
ンスマイクＡ１に対する入射角度θが変化する場合で
も、入射波１１１が仕切り壁４５の方向に曲げられ、リ
ファレンスマイクＡ１に入射した音波が、対応するエラ
ーマイクＢ１に伝播する遅れ時間や伝達特性のθの値に
よる変化は少なくなる。特に仕切り壁４５の間隔が音波
の波長の１／２以下であるときは、仕切り壁４５に垂直
な方向の音圧が一様となるため、リファレンスマイクＡ
１に入射した音波が、対応するエラーマイクＢ１に伝播
する伝達特性はθの値によらず一定となる。また、仕切
り壁を移動音源の移動方向に対して傾斜させ、移動音源
上の視点から、仕切り壁の隙間を通して、防音壁の外部
の所定の方向を望めるようにするとともに、リファレン
スマイクＡからエラーマイクＢまでの音波の伝達時間を
長くすることにより、能動騒音制御のための信号処理時
間を確保することも可能である。このため、移動する音
源に対しても、予め与えられた、伝達特性により図１の
信号処理部５で、移動する音源に対しても有効な能動騒
音制御装置付き防音壁を提供できる。When a car or train serving as a sound source such as a road or a railroad moves, as shown in FIG. 4, a plurality of reference microphones A1, A2 and A3 and a speaker D are provided.
1, D2 and D3 and error microphones B1, B2 and B
By providing a plurality of sets 3 along the soundproof wall and partitioning them by the partition wall 45, even when the incident angle θ from the moving sound source such as the car S3 to the reference microphone A1 changes, the incident wave 111 is bent in the direction of the partition wall 45. As a result, the delay due to the sound wave incident on the reference microphone A1 propagating to the corresponding error microphone B1 and the change due to the value of θ of the transfer characteristic are reduced. In particular, when the interval between the partition walls 45 is equal to or less than の of the wavelength of the sound wave, the sound pressure in the direction perpendicular to the partition walls 45 becomes uniform.
The transfer characteristic of the sound wave incident on the error microphone B1 to the corresponding error microphone B1 is constant regardless of the value of θ. Further, the partition wall is inclined with respect to the moving direction of the moving sound source, so that a predetermined direction outside the soundproof wall can be viewed from the viewpoint on the moving sound source through the gap between the partition walls, and the reference microphone A is connected to the error microphone. By extending the transmission time of the sound wave to B, it is also possible to secure a signal processing time for active noise control. For this reason, it is possible to provide a soundproof wall with an active noise control device that is effective also for a moving sound source by the signal processing unit 5 of FIG.
【００１４】本発明の第２の実施例を図５、図６および
図７を用いて説明する。A second embodiment of the present invention will be described with reference to FIGS. 5, 6 and 7.
【００１５】図５は複数の音源Ｓ１およびＳ２があると
き、防音壁４の音源側の騒音検知用のリファレンスマイ
クＡへの入射音波１１、１２を用いて、消音効果を確認
するエラーマイクＢの位置でＳ１およびＳ２からの音波
２１、２２と逆位相の波をつくるため、図の信号処理装
置５において、音源分離部５１でＳ１とＳ２からの音波
を分離し、Ｓ１もしくはＳ２の音について点ＡおよびＢ
までの伝達経路２１と１１もしくは２２と１２の距離の
差だけ伝達特性補正部５２１もしくは５２２にて信号を
遅らせてから、位相の反転処理を逆位相処理回路５３１
もしくは５３２で行うものである。FIG. 5 shows that when there are a plurality of sound sources S1 and S2, the error microphone B for confirming the sound-muffling effect using sound waves 11 and 12 incident on the reference microphone A for noise detection on the sound source side of the soundproof wall 4 is shown. In order to generate waves having phases opposite to the sound waves 21 and 22 from S1 and S2 at the position, in the illustrated signal processing device 5, sound waves from S1 and S2 are separated by the sound source separation unit 51, and the sound of S1 or S2 is A and B
After the signal is delayed by the transfer characteristic correction unit 521 or 522 by the difference between the distances of the transfer paths 21 and 11 or 22 and 12, the phase inversion processing is performed by the reverse phase processing circuit 531.
Alternatively, the process is performed at 532.
【００１６】図６のように、複数のマイクロホンを直線
状に等間隔に配置し、音源Ｓ３からそれぞれのマイクロ
ホンへの遅れ時間差を補正したのちに検出波形を重ね合
わせることにより、たとえば図７に示したθ＝０の正面
方向に高い感度の指向性７をもたせたマイクロホンアレ
イＡ４を防音壁のエッジ４３に設置することにより、自
動車などの移動音源Ｓ３が正面方向付近でのみ動作させ
ることができる。As shown in FIG. 6, by arranging a plurality of microphones at regular intervals in a straight line, correcting the delay time difference from the sound source S3 to each microphone, and superimposing the detected waveforms, for example, as shown in FIG. By installing the microphone array A4 having the directivity 7 with high sensitivity in the front direction of θ = 0 at the edge 43 of the soundproof wall, the moving sound source S3 such as an automobile can be operated only near the front direction.
【００１７】また、図７に示した、例えば、複数の音源
からそれぞれのマイクロホンへの遅れ時間差を補正した
検出波形を重ね合わせを、それぞれの音源毎に行う音源
分離回路５１にて同時に複数の方向の音源の波形を分離
することにより、方向の異なる複数の音源からの音を同
時に、低減可能な能動騒音制御装置付き防音壁を提供で
きる。In addition, for example, a sound source separation circuit 51 for correcting the delay time difference from a plurality of sound sources to the respective microphones shown in FIG. By separating the waveforms of the sound sources, it is possible to provide a soundproof wall with an active noise control device that can simultaneously reduce sounds from a plurality of sound sources in different directions.
【００１８】また、上記騒音源の騒音情報を検出するリ
ファレンスマイクと、騒音の低減効果を確認するエラー
マイクにおいて、所定の周波数帯域内の騒音レベルがあ
らかじめ与えられた値を同時に超えた場合に、能動騒音
制御装置によりスピーカから音を発生させることによ
り、マイクロホンなど異常による誤動作を抑制すること
ができる。In the reference microphone for detecting the noise information of the noise source and the error microphone for confirming the noise reduction effect, when the noise level in a predetermined frequency band simultaneously exceeds a predetermined value, By generating sound from the speaker by the active noise control device, it is possible to suppress malfunction due to an abnormality such as a microphone.
【００１９】[0019]
【発明の効果】本発明によれば、音源の位置によらず
に、騒音低減が可能な能動制御型防音壁が実現可能であ
る。これにより、高速道路や鉄道などの移動する音源か
らの交通騒音などに対して、特に低周波での騒音を低減
し、高い周波数で効果のある吸音材などを用いた従来の
防音壁との組み合わせにより、全周波数帯域での騒音低
減が可能となる。According to the present invention, it is possible to realize an active control type soundproof wall capable of reducing noise regardless of the position of a sound source. This reduces traffic noise from moving sound sources such as expressways and railways, especially at low frequencies, and combines it with conventional noise barriers that use sound absorbing materials that are effective at high frequencies. This makes it possible to reduce noise in all frequency bands.
【図１】本発明の全体構成図FIG. 1 is an overall configuration diagram of the present invention.
【図２】ホイヘンスの原理説明図FIG. 2 is a diagram illustrating the principle of Huygens.
【図３】従来の技術の全体構成図FIG. 3 is an overall configuration diagram of a conventional technique.
【図４】本発明の第１の実施例の斜視図FIG. 4 is a perspective view of the first embodiment of the present invention.
【図５】本発明の第２の実施例の構成図FIG. 5 is a configuration diagram of a second embodiment of the present invention.
【図６】本発明の第２の実施例の斜視図FIG. 6 is a perspective view of a second embodiment of the present invention.
【図７】マイクロホンアレイの指向性の計算例FIG. 7 is a calculation example of the directivity of a microphone array
４…防音壁、１…信号処理装置、Ｓ…騒音源、Ａ…騒音
検出手段、Ｂ…消音効果の検出手段、Ｄ…スピーカ。4 ... Soundproof wall, 1 ... Signal processing device, S ... Noise source, A ... Noise detecting means, B ... Sound absorbing effect detecting means, D ... Speaker.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 ▲高▼橋 稔 千葉県松戸市上本郷字船付537 日立プラ ント建設株式会社松戸研究所内 (72)発明者 前 浩之 茨城県日立市幸町三丁目２番１号 日立エ ンジニアリング株式会社内 (72)発明者 渡部 眞▲徳▼ 茨城県土浦市神立町502番地 株式会社日 立製作所機械研究所内 (72)発明者 高橋 博 東京都千代田区神田駿河台四丁目６番地 株式会社日立製作所機電事業部内 (72)発明者 ▲高▼嶋 功一 茨城県土浦市神立町603番地 株式会社日 立製作所土浦工場内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor ▲ Taka ▼ Minoru Hashimoto 537 with a boat on Kamigo Hongo, Matsudo City, Chiba Prefecture Inside the Matsudo Research Laboratory, Ltd. (72) Inventor Hiroyuki Mae 3-chome, Sachimachi, Hitachi City, Ibaraki Prefecture No. 2 1 Hitachi Engineering Co., Ltd. (72) Inventor Makoto Watanabe 502 Tokuchi, Tsuchiura-machi, Tsuchiura-city, Ibaraki Pref. Machinery Research Laboratory, Hitachi, Ltd. (72) Inventor Hiroshi Takahashi Surugadai, Kanda, Chiyoda-ku, Tokyo 4-6-Came within Hitachi, Ltd.Mechanical and Electrical Engineering Division
Claims (3)
段と、前記騒音源からの伝播音波に対して逆位相で且つ
同一音圧の音波を前記付加音を発生させる付加音発生手
段と、前記騒音源からの伝播音波との音波干渉による消
音効果を検出する第２の検出手段を備えた能動騒音制御
装置付き防音壁において、 前記第１の検出手段は、二次元の平面的な広がりを持つ
第１の壁体の端部のエッジ近傍に設け、前記第２の検出
手段は、前記第１の壁体に対して騒音源の反対側に設け
た第２の壁体の端部のエッジ近傍に設け、前記付加音発
生手段は前記第１の壁体と前記前記第２の壁体の間に設
けることを特徴とする能動騒音制御装置付き防音壁。A first detecting means for detecting noise information of a noise source; and an additional sound generating means for generating a sound wave having the same sound pressure and a phase opposite to a sound wave propagated from the noise source. And a soundproof wall with an active noise control device comprising a second detecting means for detecting a sound deadening effect due to sound wave interference with a sound wave propagated from the noise source, wherein the first detecting means has a two-dimensional planar shape. The second detecting means is provided near the edge of the end of the first wall having a spread, and the second detecting means is provided at the end of the second wall provided on the opposite side of the noise source with respect to the first wall. Wherein the additional sound generating means is provided between the first wall and the second wall.
１、第２の検出手段、及び付加音発生手段を複数組併設
し、それぞれの組は互いに、前記第１及び第２の防音壁
と接する分離壁で仕切られていることを特徴とする請求
項１記載の能動騒音制御装置付き防音壁。2. A plurality of sets of the first and second detection means and additional sound generation means are provided along the first and second walls, and each set is mutually associated with the first and second walls. 2. The soundproof wall with an active noise control device according to claim 1, wherein the soundproof wall is divided by a separation wall in contact with the second soundproof wall.
１の壁体のエッジを前記騒音源の移動方向と略平行と
し、前記騒音源の騒音情報を検出する第１の検出手段は
騒音源の移動方向を含む面内に指向性を持つことを特徴
とする請求項１記載の能動騒音制御装置付き防音壁。3. A first detecting means for detecting the noise information of the noise source by making an edge of the first wall substantially parallel to a moving direction of the noise source with respect to the noise source moving substantially linearly. 2. The soundproof wall with an active noise control device according to claim 1, wherein the soundproof wall has directivity in a plane including the moving direction of the noise source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07306197A JP3684286B2 (en) | 1997-03-26 | 1997-03-26 | Sound barrier with active noise control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07306197A JP3684286B2 (en) | 1997-03-26 | 1997-03-26 | Sound barrier with active noise control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10268873A true JPH10268873A (en) | 1998-10-09 |
| JP3684286B2 JP3684286B2 (en) | 2005-08-17 |
Family
ID=13507471
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07306197A Expired - Fee Related JP3684286B2 (en) | 1997-03-26 | 1997-03-26 | Sound barrier with active noise control device |
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| Country | Link |
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| JP (1) | JP3684286B2 (en) |
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| JP2001075576A (en) * | 1999-06-29 | 2001-03-23 | Toshiba Corp | Three-dimensional active muffling device |
| JP2002006854A (en) * | 2000-04-21 | 2002-01-11 | Mitsubishi Heavy Ind Ltd | Active sound reducing device and active sound insulating wall having the same |
| EP1349143A2 (en) * | 2002-03-29 | 2003-10-01 | Kabushiki Kaisha Toshiba | Active sound muffler and active sound muffling method |
| JP2004029446A (en) * | 2002-06-26 | 2004-01-29 | Nippon Kinzoku Tanchiki Seizo Kk | Sound insulation device |
| WO2006051602A1 (en) * | 2004-11-12 | 2006-05-18 | Takenaka Corporation | Noise reduction apparatus |
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