JP3293170B2 - Active silencer - Google Patents
Active silencerInfo
- Publication number
- JP3293170B2 JP3293170B2 JP13656292A JP13656292A JP3293170B2 JP 3293170 B2 JP3293170 B2 JP 3293170B2 JP 13656292 A JP13656292 A JP 13656292A JP 13656292 A JP13656292 A JP 13656292A JP 3293170 B2 JP3293170 B2 JP 3293170B2
- Authority
- JP
- Japan
- Prior art keywords
- noise
- sound
- signal processing
- moving body
- signal
- 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.)
- Expired - Fee Related
Links
Landscapes
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
- Building Environments (AREA)
- Details Of Measuring And Other Instruments (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、移動体から発生する騒
音に対して、移動体の移動方向に沿って設けられた防音
塀の近傍に設けた発音体から、同振幅逆位相の音波を加
えて、音波干渉によって能動的に消音するように動作す
る能動型消音装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for generating sound waves having the same amplitude and opposite phase from a sound generator provided near a soundproof wall provided along a moving direction of a moving body with respect to noise generated from the moving body. In addition, the present invention relates to an active silencer that operates so as to be actively silenced by sound wave interference.
【０００２】[0002]
【従来の技術】従来、たとえば新幹線のような移動体か
ら放射される騒音の低減に対して、移動方向に沿って、
音の伝搬流路内に防音塀を設け、その防音塀による回折
に伴う減音で対処してきた。高速化ニーズの高い移動物
体では、速度を増すと、流体騒音が急激に増大する。一
方、この防音塀の効果はその高さに比例するが、高くす
ると移動体からの視覚を遮ぎ、乗客の快適感を阻害する
他、風圧により防音塀に加わる外力が増加するなど強度
の信頼性の点から、その高さには限界がある。その結
果、防音塀の対策は、高速化に伴う騒音の低減には限界
がある。これに対して、別の方法として、古くから提案
されていた能動型消音装置、即ち、音源からの伝搬波に
対して、逆位相の付加音を加え、音波干渉によって消音
を強制的に生じさせる方法が着目されつつある。能動型
消音装置は電子デバイス，信号処理技術等の急速な発達
に伴って、最近、様々な観点からの研究成果が次々と発
表されている。防音塀に能動型消音装置を採り入れた公
知例として、特開平2−222999号公報に開示されてい
る。この公知例では、発音体であるスピーカ，騒音源検
知センサであるマイクロホン，アンプ、及びこれらの制
御回路を防音塀に内蔵して、防音塀を回り込んで届く騒
音を低減させる方法が開示されている。この例では、広
い周波数帯域の騒音に対して、この騒音と効率良く消音
可能な所望の音波を制御回路でつくるには、約数ミリ秒
の時間を要するが、この間に、音波は、音速（例えば常
温、空気中では３４０ｍ／ｓ）で伝搬するから、マイク
ロホンと発音体が近傍で防音塀本体におかれているこの
公知例では、時間的にランダムに変化する一般騒音を消
音することは原理的に不可能であり、周期騒音でかつ、
静止した騒音源に好適である。2. Description of the Related Art Conventionally, in order to reduce noise radiated from a moving body such as a Shinkansen, for example,
A soundproof wall has been installed in the sound propagation channel, and noise has been dealt with by the diffraction caused by the soundproof wall. For a moving object with a high need for high speed, as the speed increases, the fluid noise increases rapidly. On the other hand, the effect of this soundproof fence is proportional to its height, but if it is raised, it will obstruct the vision from moving objects and hinder passengers' feeling of comfort. In terms of gender, its height is limited. As a result, soundproof fence measures have a limit in reducing noise associated with higher speeds. On the other hand, as another method, an active silencer that has been proposed for a long time, that is, an additional sound having an opposite phase is added to a propagation wave from a sound source, and the silence is forcibly generated by sound wave interference. The method is getting attention. With the rapid development of electronic devices, signal processing technology, and the like, active silencers have recently been successively announcing research results from various viewpoints. A known example in which an active silencer is incorporated in a soundproof fence is disclosed in Japanese Patent Application Laid-Open No. 2-222999. In this known example, a method is disclosed in which a speaker as a sounding body, a microphone and an amplifier as a noise source detection sensor, and a control circuit for these components are incorporated in a soundproof fence to reduce noise that reaches around the soundproof fence. I have. In this example, it takes about several milliseconds for the control circuit to produce a desired sound wave that can be efficiently silenced with the noise in a wide frequency band, and during this time, the sound wave has a sound speed ( For example, since the sound propagates at 340 m / s in the air at room temperature, in this known example in which a microphone and a sounding body are placed in the soundproof wall body in the vicinity, it is a principle to mitigate general noise that changes randomly with time. Is impossible, periodic noise, and
Suitable for stationary noise sources.
【０００３】[0003]
【発明が解決しようとする課題】前述の公知例では、移
動するランダムな騒音源に対する配慮はなされていな
い。一般に高速で移動する移動物体から発生する騒音
は、モータやギヤ，車輪等からの周期音を含む駆動メカ
音と静止空気を押し分けながら進む際に発生するランダ
ムな流体音からなる。速度が増加すると、駆動メカ音は
速度の約３乗に比例する反面、後者の流体音は、速度の
約６乗に比例するので、高速になるほど、流体音が優勢
となり、そのランダムな騒音低減のニーズがきわめて高
い。本発明の目的は、高速の移動体から放射した周期音
に加えて、ランダムな騒音を、効果的に低減可能な能動
型消音装置を提供することにある。In the above-mentioned known example, no consideration is given to a moving random noise source. In general, noise generated from a moving object that moves at high speed is composed of a driving mechanism sound including a periodic sound from a motor, gears, wheels, and the like, and a random fluid sound generated when the vehicle travels while pushing the still air. When the speed increases, the driving mechanism noise is proportional to the third power of the speed, while the latter fluid noise is proportional to the sixth power of the speed. Therefore, the higher the speed, the more the fluid noise becomes dominant, and its random noise reduction Needs are extremely high. An object of the present invention is to provide an active silencer capable of effectively reducing random noise in addition to periodic sound radiated from a high-speed moving body.
【０００４】[0004]
【課題を解決するための手段】これらの問題を解決する
ためには、騒音を発する移動体とこの騒音源から放射さ
れた騒音を遮蔽するように、前記移動体の移動方向に沿
って地上に設けられた防音塀と前記騒音または騒音と高
い相関をもつ信号を検出する、少なくとも１個の音源検
出センサとこの検出装置の出力信号を信号処理する信号
処理装置と、騒音との音波干渉用で、この信号処理装置
の出力信号で駆動され、前記防音塀の近傍に設けられた
信号増幅部と音波放射部からなる発音体と、騒音との音
波干渉によって得られる消音量を検出する消音量検出部
で構成される能動型消音装置において、前記音源検出装
置は、移動体に設けられ、その音源検出センサ及びその
出力信号のワイヤレス送波部から構成され、送波部出力
信号の受波回路を地上におかれた前記信号処理装置に設
けた。また前記能動型消音装置において、前記移動体に
搭載された音源検出装置に加えて、移動体の移動位置情
報をセンシング可能な移動体移動位置情報センサを設
け、前記信号処理装置には前記移動位置情報を考慮して
信号処理する手段を設けた。さらに移動体には、前記音
源検出装置と前記信号処理装置と前記信号処理装置の出
力信号のワイヤレス送波部及び前記消音量の受波回路が
設けられており、地上には発音体駆動信号用受波回路及
び前記消音量の消音量信号送波回路を設けた構成にし
た。In order to solve these problems, a moving body that emits noise and the noise radiated from the noise source are shielded on the ground along the moving direction of the moving body. At least one sound source detection sensor for detecting a noise barrier provided and the noise or a signal having a high correlation with the noise, a signal processing device for performing signal processing on an output signal of the detection device, and for sound wave interference with the noise. A sound-attenuator driven by an output signal of the signal processing device and including a signal amplifying unit and a sound-wave radiating unit provided near the soundproof wall; In the active silencer configured by the section, the sound source detection device is provided in a moving body, is configured by a sound source detection sensor and a wireless transmission unit of the output signal thereof, and a reception circuit of a transmission unit output signal. It provided in the signal processing apparatus placed thereon. In the active silencer, in addition to a sound source detection device mounted on the moving body, a moving body moving position information sensor capable of sensing moving position information of the moving body is provided, and the moving position is provided in the signal processing device. A means for performing signal processing in consideration of information is provided. Further, the moving body is provided with the sound source detection device, the signal processing device, a wireless transmission unit for the output signal of the signal processing device, and a reception circuit for the silencing volume, and on the ground, a sounding body drive signal A configuration was provided in which a receiving circuit and a silencing signal transmission circuit for silencing the silencing were provided.
【０００５】[0005]
【作用】本発明は、移動体である騒音源から放射される
騒音またはこの騒音と相関の高い信号を移動体上で感知
し、この情報またはこれと移動体の移動情報を地上で受
波する構成をとっている。そして防音塀の移動体走行路
と反対側の領域で、移動体から防音塀を回り込んで伝搬
する騒音と効果的に打ち消すような信号を信号処理装置
内で創成し、その信号を増幅後、防音塀の近傍に置いた
発音体から周囲に放射すると消音できる。この発明で
は、防音塀の移動体走行路と反対側の領域に消音量検知
センサを設け、その出力が常に最小となるように、信号
処理装置内で適応処理を行う構成を採っているが、音場
が一定の場合、必ずしも消音量検知センサは必要とはし
ない。ところで、前述のように移動音源からの放射音の
多くは、流体騒音であるから、周期音とは異なり、全く
ランダムである。本発明では、音波の伝搬速度に比べ
て、空間中を伝わる電波の伝搬速度がきわめて速いこと
に着目し、主に信号処理装置で所望の信号を創成する時
間と電波伝搬時間の和に相当する音波伝搬距離だけ、消
音したい領域から少なくとも遠くの位置で移動体騒音源
情報を検知し、その信号を送波し、地上の消音領域近傍
に置かれた受波回路で、受波後この信号を基に信号処理
を行えば、騒音源から伝搬する音波とほぼ同時刻に発音
体から放射した音波が干渉し消音できる。According to the present invention, noise radiated from a noise source, which is a moving body, or a signal having a high correlation with the noise is detected on the moving body, and this information or the movement information of the moving body is received on the ground. It has a configuration. Then, in the area of the soundproof fence opposite to the moving object running path, a signal is created in the signal processing device that effectively cancels out noise that travels around the soundproof fence from the moving object and propagates, and after amplifying the signal, The sound can be muted by radiating it from the sounding body placed near the soundproof fence. In the present invention, a sound-absorbing volume detection sensor is provided in an area of the soundproof wall opposite to the moving body traveling path, and the adaptive processing is performed in the signal processing device so that the output is always minimized. When the sound field is constant, the silence detection sensor is not necessarily required. By the way, most of the radiated sound from the moving sound source is fluid noise, as described above, and is completely random unlike periodic sound. In the present invention, attention is paid to the fact that the propagation speed of a radio wave propagating in space is extremely fast compared to the propagation speed of a sound wave, and it is mainly equivalent to the sum of the time for generating a desired signal and the radio wave propagation time in a signal processing device. The mobile body noise source information is detected at a position at least distant from the area to be silenced by the sound wave propagation distance, the signal is transmitted, and the signal is received by a receiving circuit placed near the muffled area on the ground, and the signal is received. If signal processing is performed based on this, sound waves radiated from the sounding body at substantially the same time as sound waves propagating from the noise source can interfere with each other and be silenced.
【０００６】なお、防音塀を回り込む騒音と発音体から
の音波が同一タイミングで干渉するようにするには、移
動体に搭載された音源検出装置に加えて、移動体の移動
位置情報検出センサを設け、信号処理装置には移動位置
情報を考慮して信号処理する手段を設けている。[0006] In order to make the noise around the soundproof fence and the sound wave from the sounding body interfere at the same timing, in addition to the sound source detecting device mounted on the moving body, a moving position information detecting sensor of the moving body is required. The signal processing device is provided with means for performing signal processing in consideration of the movement position information.
【０００７】[0007]
【実施例】以下、添付の図面に基づいて本発明の実施例
について説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【０００８】図１，図２，図３は本発明の一実施例に係
る能動型消音装置であり、それぞれこのブロック図、移
動体及び地上に設けた信号処理部の各ブロック図を示
す。この装置が従来の装置と異なる点は、音源検知セン
サ５とその送波回路１１及び移動***置情報の検出セン
サ６とその出力信号を送波する移動***置情報送波回路
１０からなる移動体搭載信号処理部４が移動体に搭載さ
れている。そして、送波回路１１及び移動***置情報回
路１０から電波として送波する。一方、地上設備は、地
上用信号処理部７，音量検出部９及び音波放射部８で構
成されている。そこでこの信号を地上に設けた受波回路
１２及び移動***置情報受波回路１３からそれぞれの電
波を受波後、これらの信号は、信号処理装置１４に導か
れる。そこで、振幅と位相の修正機能をもつ信号処理部
１５と適応アルゴリズム１６からなる地上用信号処理部
７で、防音塀２を回り込む騒音と同タイミングの音波で
かつ、消音量検出部９の出力信号が常に最小となるよう
に、信号処理装置１４でその振幅と位相が修正された
後、信号増幅部１７で増幅後、防音塀２の頂部付近に取
り付けた音波放射部８から音波が放射し、移動体１から
伝搬され、防音塀２を回り込んだ音波と音波干渉で消音
する。その結果、電波の伝搬時間に比べて、音波の伝搬
時間が極めて小さいことが利用できるので、信号処理装
置１４における信号処理時間と音波放射部８の時間遅れ
に相当する距離より、遠く離れた位置で送波回路１１か
ら音源情報を電波として送波することで、防音塀２を回
り込んで来るランダム騒音に対して、周期音と同様に消
音できる。その結果、防音塀２を高くしなくても、移動
体１の騒音を減音できるので、乗客の快適性を損なうこ
となく、風圧による強度を損なうことはなく、移動体速
度を増加できる。なお、音源検知センサ５は、騒音源の
数にほぼ等しい個数が設けられるが、騒音検出用マイク
ロホンでなくても、騒音と高い相関を有する情報を検知
可能なセンサであればよく、たとえば、振動加速度セン
サや流体脈動センサとか、周期性騒音に対しては、周期
のタイミングが検知可能なセンサであれば良い。FIG. 1, FIG. 2, and FIG. 3 show an active silencer according to an embodiment of the present invention. FIG. 1 shows a block diagram of the active silencer, and each block diagram of a mobile unit and a signal processing unit provided on the ground. This device is different from the conventional device in that a mobile unit including a sound source detection sensor 5 and its transmitting circuit 11, a mobile position information detecting sensor 6 and a mobile unit position information transmitting circuit 10 for transmitting its output signal. The mounted signal processing unit 4 is mounted on the moving body. Then, the radio wave is transmitted from the wave transmitting circuit 11 and the moving body position information circuit 10 as radio waves. On the other hand, the ground equipment includes a ground signal processing unit 7, a volume detection unit 9, and a sound wave emitting unit 8. Then, after receiving these radio waves from the receiving circuit 12 and the moving body position information receiving circuit 13 provided on the ground, these signals are guided to the signal processing device 14. Therefore, the ground signal processing unit 7 including the signal processing unit 15 having the function of correcting the amplitude and the phase and the adaptive algorithm 16 generates a sound wave having the same timing as the noise circling the soundproof fence 2 and the output signal of the sound volume detection unit 9. After the amplitude and the phase are corrected by the signal processing device 14 so that is always minimized, the signal is amplified by the signal amplifying unit 17, and the sound wave is radiated from the sound wave radiating unit 8 attached near the top of the soundproof wall 2. The sound propagates from the moving body 1 and goes around the soundproof wall 2 and is canceled by sound wave interference. As a result, since it is possible to use that the propagation time of the sound wave is extremely short as compared with the propagation time of the radio wave, a position farther than the distance corresponding to the signal processing time in the signal processing device 14 and the time delay of the sound wave emitting unit 8 is used. By transmitting the sound source information from the wave transmitting circuit 11 as radio waves, random noise coming around the soundproof wall 2 can be silenced in the same manner as a periodic sound. As a result, the noise of the moving body 1 can be reduced without increasing the height of the soundproof fence 2, so that the speed of the moving body can be increased without impairing the comfort due to the wind pressure without impairing the passenger comfort. The number of the sound source detection sensors 5 is substantially equal to the number of noise sources. However, the number of the sound source detection sensors 5 is not limited to a noise detection microphone, but may be any sensor capable of detecting information having a high correlation with noise. For an acceleration sensor, a fluid pulsation sensor, or a periodic noise, any sensor capable of detecting the timing of the cycle may be used.
【０００９】防音塀２を回り込んでくる騒音は、防音塀
２の先端の近傍が最も騒音エネルギが高いので、この防
音塀２の先端近傍に前記音波放射体８を取付けまたは防
音塀２の先端部内に収納した構成を採ると、特に能動型
消音装置の消音量が増加する。The noise coming around the soundproof fence 2 has the highest noise energy near the front end of the soundproof fence 2. Therefore, the sound wave radiator 8 is attached near the front end of the soundproof fence 2 or the front end of the soundproof fence 2. When the configuration is adopted in which the muffler is housed inside, the silencing volume of the active silencer increases.
【００１０】なお移動***置情報の検出は、たとえば移
動体１の走行用車輪３近傍に設けた光学式等の検出セン
サ６にて基準点からの移動距離を把握できるため、容易
に可能である。It is to be noted that the detection of the moving body position information can be easily performed, for example, since the moving distance from the reference point can be grasped by an optical type detection sensor 6 provided near the traveling wheel 3 of the moving body 1. .
【００１１】図４，図５は本発明の他実施例に係る能動
型消音装置のブロック図と移動体１に搭載された信号処
理部のブロック図を示す。この装置が従来の装置と異な
る点は、移動体１には、音源検知センサ５と信号処理装
置１４と位置情報検出センサ６と信号処理装置１４の出
力信号の送波部１９からなる移動体搭載信号処理部１８
及び消音量の検出部９の受波回路２０が設けられてお
り、地上には音波放射部８と信号増幅部１７及びその駆
動信号用受波回路２１及び消音量の消音量信号送波回路
２２を設けたことである。沿線騒音を低減するには、移
動体１の走行路に沿って、アクティブノイズコントロー
ル用地上設備を数多く設ける必要があるが、本実施例で
は上述の通り、地上設備が簡略化でき、しかも電波の伝
搬速度が音波の伝搬速度にくらべてきわめて速いことが
利用できるため、図１，図２，図３に示す実施例と同様
に、ランダムな流体音も周期音と低減できる。FIG. 4 and FIG. 5 show a block diagram of an active silencer according to another embodiment of the present invention and a block diagram of a signal processing unit mounted on the moving body 1, respectively. The difference between this device and the conventional device is that the moving body 1 includes a sound source detection sensor 5, a signal processing device 14, a position information detection sensor 6, and a transmission body 19 for transmitting an output signal of the signal processing device 14. Signal processing unit 18
A sound receiving circuit 20 is provided for the sound-absorbing sound detecting section 9. On the ground, a sound wave emitting section 8, a signal amplifying section 17, a driving signal wave receiving circuit 21, and a silencing sound-absorbing sound signal transmitting circuit 22. That is, In order to reduce the noise along the way, it is necessary to provide a large number of active noise control ground facilities along the traveling path of the mobile unit 1. However, in this embodiment, as described above, the ground facilities can be simplified and the radio wave Since it is possible to utilize that the propagation speed is extremely higher than the propagation speed of the sound wave, the random fluid sound can be reduced to the periodic sound as in the embodiments shown in FIGS.
【００１２】[0012]
【発明の効果】本発明によれば、電波の伝搬速度が音波
の伝搬速度に比べてきわめて速いことが利用でき、音源
検出センサによって検出した騒音が防音塀を回り込んで
くるまでに、逆位相で同振幅の信号創成が信号処理回路
で完了できるので、ランダムな騒音を周期的な騒音と同
様に低減できる。その結果、広範な周波数帯域での騒音
が低減でき、防音塀を高くしなくても十分な消音が得ら
れ、防音塀を高くすることによる眺めなどの快適性と風
圧増加による信頼性を阻害することはない。また高さが
等しい従来の受動型防音塀に比べて、騒音低減量を大幅
に増加できるので、移動体の高速化による騒音公害が防
止できる。According to the present invention, it is possible to utilize the fact that the propagation speed of the radio wave is much faster than the propagation speed of the sound wave. Since the signal generation of the same amplitude can be completed by the signal processing circuit, random noise can be reduced in the same manner as periodic noise. As a result, noise in a wide frequency band can be reduced, sufficient noise can be obtained without raising the soundproof fence, and comfort such as view by increasing the soundproof fence and reliability due to increased wind pressure are impaired. Never. Also, the amount of noise reduction can be greatly increased as compared with the conventional passive soundproof fence having the same height, so that noise pollution due to the speeding up of the moving body can be prevented.
【図１】本発明の一実施例の能動型消音装置のブロック
図。FIG. 1 is a block diagram of an active silencer according to one embodiment of the present invention.
【図２】移動体上に設けた信号処理部のブロック図。FIG. 2 is a block diagram of a signal processing unit provided on a moving object.
【図３】地上に設けた信号処理部のブロック図。FIG. 3 is a block diagram of a signal processing unit provided on the ground.
【図４】本発明の他の実施例に係る能動型消音装置のブ
ロック図。FIG. 4 is a block diagram of an active silencer according to another embodiment of the present invention.
【図５】移動体に搭載された信号処理部のブロック図。FIG. 5 is a block diagram of a signal processing unit mounted on a moving object.
１…移動体、２…防音塀、５…音源検知センサ、１２…
受波回路、１３…移動***置情報受波回路、１４…信号
処理装置、１８…移動体搭載信号処理部、１９…ワイヤ
レス送波部、２０…受波回路。DESCRIPTION OF SYMBOLS 1 ... Moving body, 2 ... Soundproof wall, 5 ... Sound source detection sensor, 12 ...
Receiving circuit, 13: moving object position information receiving circuit, 14: signal processing device, 18: moving object mounted signal processing unit, 19: wireless transmitting unit, 20: receiving circuit.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 堀畑 勝利 山口県下松市東豊井794番地 株式会社 日立製作所 笠戸工場内 (56)参考文献 特開 平５−35280（ＪＰ，Ａ) 特開 平３−195296（ＪＰ，Ａ) 特開 平２−222999（ＪＰ，Ａ) 特開 平４−500（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G10K 11/178 B61D 49/00 E01F 8/00 E01F 8/02 E04B 1/82 G12B 17/00 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Katsushi Horihata 794 Higashi-Toyoi, Kudamatsu-shi, Yamaguchi Pref. Kasado Plant, Hitachi, Ltd. (56) References JP-A-5-35280 (JP, A) JP-A-3-3 195296 (JP, A) JP-A-2-222999 (JP, A) JP-A-4-500 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) G10K 11/178 B61D 49 / 00 E01F 8/00 E01F 8/02 E04B 1/82 G12B 17/00
Claims (1)
ように、前記移動体の移動方向に沿って地上に設けられ
た防音塀、前記騒音または前記騒音と高い相関をもつ信
号を検出する少なくとも１個の音源検出センサを有する
検出装置と、前記検出装置の出力信号を信号処理する信
号処理装置と、騒音との音波干渉用で、前記信号処理装
置の出力信号で駆動され、前記防音塀の近傍に設けられ
た信号増幅部と音波放射部からなる発音体で構成される
能動型消音装置あるいは、前記移動体と前記防音塀と前
記音源検出装置と前記信号処理装置と前記発音体と、騒
音との音波干渉によって得られる消音量を検出する消音
量検出部で構成される能動型消音装置において、前記音
源検出装置は、前記移動体に設けられ、前記音源検出セ
ンサ及びその出力信号の送波部から構成され、送波部出
力信号の受波回路を地上におかれた前記信号処理装置に
設けたことを特徴とする能動型消音装置。1. A soundproof fence provided on the ground along a moving direction of a moving body to detect a moving body that emits noise and the noise so as to shield the noise, and a signal having a high correlation with the noise. A detection device having at least one sound source detection sensor; a signal processing device for performing signal processing on an output signal of the detection device; and a soundproof wall driven by the output signal of the signal processing device for sound wave interference with noise. An active silencer or a sound attenuator comprising a signal amplifying unit and a sound emitting unit provided in the vicinity of the moving body, the soundproof fence, the sound source detecting device, the signal processing device, and the sounding body, In an active silencer including a silence detection unit that detects a silence obtained by sound wave interference with noise, the sound source detection device is provided in the moving body, and the sound source detection sensor and its output are provided. No. of consists transmitting unit, the active silencer, characterized in that the reception circuit of the transmitting unit output signal provided to the signal processing unit placed on the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13656292A JP3293170B2 (en) | 1992-05-28 | 1992-05-28 | Active silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13656292A JP3293170B2 (en) | 1992-05-28 | 1992-05-28 | Active silencer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05333875A JPH05333875A (en) | 1993-12-17 |
| JP3293170B2 true JP3293170B2 (en) | 2002-06-17 |
Family
ID=15178148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13656292A Expired - Fee Related JP3293170B2 (en) | 1992-05-28 | 1992-05-28 | Active silencer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3293170B2 (en) |
-
1992
- 1992-05-28 JP JP13656292A patent/JP3293170B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05333875A (en) | 1993-12-17 |
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