JP2001056691A - Active noise-elimination system - Google Patents
Active noise-elimination systemInfo
- Publication number
- JP2001056691A JP2001056691A JP11230672A JP23067299A JP2001056691A JP 2001056691 A JP2001056691 A JP 2001056691A JP 11230672 A JP11230672 A JP 11230672A JP 23067299 A JP23067299 A JP 23067299A JP 2001056691 A JP2001056691 A JP 2001056691A
- Authority
- JP
- Japan
- Prior art keywords
- duct
- small
- diameter
- sensor
- sound
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (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、ダクト内騒音の伝
搬通路内において騒音と逆位相同音圧の音波を放射して
騒音の消音を行なう能動的消音システムに係り、特に大
口径のダクトに対して前記能動的消音システムを適用す
る場合に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active noise reduction system that radiates sound waves having the same phase and opposite sound pressure as noise in a propagation path of noise in the duct to muffle the noise, and more particularly to a large-diameter duct. The present invention relates to a case where the active silencing system is applied.
【０００２】[0002]
【従来の技術】一般に、空調用ダクト内を伝搬する騒音
を消音する一つの方法として、ダクト内に内貼りした吸
音材によって吸音する方法など、主に受動的な消音方法
が取られてきたが、圧力損失や大きさなどの問題点を抱
えている。一方、ダクト内伝搬騒音の音波に対して逆位
相同音圧の音波を同時にダクト内に放射して、両音波の
干渉によって消音を行なう能動的な消音方法の研究が盛
んに行われている。しかしまだ多くの問題が残ってい
る。2. Description of the Related Art Generally, as a method of silencing noise propagating in an air-conditioning duct, a passive noise silencing method such as a method of absorbing sound with a sound absorbing material stuck inside the duct has been employed. However, there are problems such as pressure loss and size. On the other hand, active studies have been actively conducted on active silencing methods that simultaneously radiate sound waves of opposite phase and same sound pressure into the duct with respect to the sound waves of the propagation noise in the duct, and cancel the sound by interference of the two sound waves. But there are still many problems.
【０００３】図７は従来の能動騒音制御システムを示す
構成説明図である。即ち、マイクロホンよりなる第１セ
ンサ６１によってダクト６２内を伝搬する騒音の情報を
アナログ電気信号として取り込み、さらにマイクロホン
アンプの増幅器６３を通して増幅する。FIG. 7 is an explanatory diagram showing the configuration of a conventional active noise control system. That is, the information of the noise propagating in the duct 62 is captured as an analog electric signal by the first sensor 61 composed of a microphone, and further amplified through the amplifier 63 of the microphone amplifier.
【０００４】前記増幅器６３によって増幅されたアナロ
グ電気信号に対して、まずアナログローパスフィルタ６
４を通す。その後Ａ／Ｄ（アナログ−ディジタル）変換
器６５を通してディジタル電気信号に変換する。The analog electric signal amplified by the amplifier 63 is first converted into an analog low-pass filter 6.
Pass 4 Thereafter, the signal is converted into a digital electric signal through an A / D (analog-digital) converter 65.
【０００５】こうして消音の対象とする低周波数領域の
信号のみを含むディジタル電気信号をディジタル演算部
６６に入力する。[0005] In this manner, a digital electric signal including only a signal in a low frequency region to be silenced is input to the digital operation unit 66.
【０００６】また、システムが稼働することによるダク
ト６２内の消音の状況が、騒音源からみて消音用スピー
カ６７より下流側に設置されたマイクロホンよりなる第
２センサ６８で検知される。この第２センサ６８から得
られたダクト６２内の消音状況の情報であるアナログ電
気信号も、第１センサ６１から得られたアナログ電気信
号と同じように、マイクロホンアンプの増幅器６９、ア
ナログ信号処理によるアナログローパスフィルタ７０、
Ａ／Ｄ（アナログ−ディジタル）変換器７１を通す。[0006] The state of silencing in the duct 62 due to the operation of the system is detected by a second sensor 68 comprising a microphone installed downstream of the silencing speaker 67 as viewed from the noise source. Similarly to the analog electric signal obtained from the first sensor 61, the analog electric signal which is the information of the muffling state in the duct 62 obtained from the second sensor 68 is also obtained by the amplifier 69 of the microphone amplifier and the analog signal processing. Analog low-pass filter 70,
The signal passes through an A / D (analog-digital) converter 71.
【０００７】前記第２センサ６８からはシステムが稼働
することによってどれだけダクト６２内伝搬騒音が消音
されたかの情報が入力される。ディジタル演算部６６で
はその情報を取り込んでその信号が常にゼロに近づくよ
うな最適な係数を適応制御アルゴリズム７２に基づいて
算出し、消音信号発生フィルタ７３のフィルタ係数とし
て第１センサ６１からの入力信号に畳み込む演算を行な
う。[0007] From the second sensor 68, information on how much the propagation noise in the duct 62 has been muted by the operation of the system is input. The digital operation unit 66 fetches the information and calculates an optimum coefficient such that the signal always approaches zero on the basis of the adaptive control algorithm 72 based on the adaptive control algorithm 72. Perform an operation to convolve with.
【０００８】こうしてディジタル演算部６６では様々な
係数を第１センサ６１からの入力信号に畳み込み演算
し、適応制御アルゴリズム７２により消音信号発生フィ
ルタ７３を逐次更新して消音用ディジタル電気信号を作
成する。In this way, the digital operation unit 66 convolves various coefficients with the input signal from the first sensor 61 and successively updates the muffling signal generation filter 73 by the adaptive control algorithm 72 to create a muffling digital electric signal.
【０００９】この消音用ディジタル電気信号をＤ／Ａ
（ディジタル−アナログ）変換器７４によりアナログ電
気信号に変換してアナログ信号処理によるアナログロー
パスフィルタ７５を通して最終的に消音の対象とする低
周波数領域の信号のみを含む消音用アナログ電気信号に
する。[0009] The digital electric signal for silencing is converted into a D / A signal.
The signal is converted into an analog electric signal by a (digital-analog) converter 74, and finally converted into an analog electric signal for noise reduction including only a signal in a low frequency region to be silenced through an analog low-pass filter 75 by analog signal processing.
【００１０】この消音用アナログ電気信号をパワーアン
プの増幅器７６により増幅して消音用スピーカ６７を駆
動し、ダクト６２内に消音用音波を放射するのである。The silencing analog electric signal is amplified by an amplifier 76 of a power amplifier to drive a silencing speaker 67 to emit a silencing sound wave into the duct 62.
【００１１】こうして様々な信号処理が施され、ダクト
６２内を伝搬する騒音に対して逆位相同音圧の消音用音
波がダクト６２内に放射される。放射された消音用音波
はダクト６２内を伝搬する騒音音波と干渉を起こし打ち
消しあって結果、消音効果が得られる。In this manner, various signal processings are performed, and a noise-canceling sound wave having the same phase and opposite sound pressure as the noise propagating in the duct 62 is radiated into the duct 62. The radiated sound wave for noise cancellation interferes with the noise sound wave propagating in the duct 62 and cancels out each other. As a result, a sound deadening effect is obtained.
【００１２】[0012]
【発明が解決しようとする課題】しかしながら、能動制
御によりダクト内伝搬騒音を消音する場合、その消音可
能な上限周波数は、ダクト横断面方向に生じる第１定在
波の周波数までであり、この周波数はダクト辺の寸法に
よってきまる。したがって、大型ダクトに能動制御を適
用した場合、消音できる騒音が非常に低い帯域に絞られ
てしまうという問題点があった。However, when the propagation noise in the duct is silenced by active control, the upper limit frequency at which the noise can be silenced is up to the frequency of the first standing wave generated in the duct cross-sectional direction. Is determined by the dimensions of the duct side. Therefore, when active control is applied to a large duct, there is a problem that noise that can be silenced is narrowed to a very low band.
【００１３】現在この課題を回避する手段として、１対
もしくは複数対の消音用音波発生装置をそれぞれ大口径
ダクトの対向壁面に向かい合わせに設置して同音圧同位
相で駆動する方法、もしくは大口径ダクト内を小口径ダ
クトに分割してそれぞれの小口径ダクトに能動制御シス
テムを設置して消音する方法が取られてきた。At present, as a means for avoiding this problem, a method in which one or a plurality of pairs of sound-absorbing sound wave generating devices are installed to face opposite walls of a large-diameter duct and driven at the same sound pressure and in-phase, or A method has been adopted in which the duct is divided into small-diameter ducts, and an active control system is installed in each of the small-diameter ducts to mute the sound.
【００１４】しかし、前者では大口径ダクトといっても
限界があること、また後者では小口径ダクト分だけの能
動制御システムが必要となりコストの面から不利である
ことが問題であった。However, the former has a problem that there is a limit even if it is a large-diameter duct, and the latter requires an active control system only for a small-diameter duct, which is disadvantageous in terms of cost.
【００１５】本発明は上記の事情に鑑みてなされたもの
で、ダクト内空間の一部を複数の小口径ダクトに分割し
て消音できる騒音を所定の周波数帯域にすることがで
き、さらに、１つの代表小口径ダクトにのみ消音用信号
発生フィルタを算出する適応制御演算部を設け、他の小
口径ダクトには前記適応制御演算部で算出した消音用信
号発生フィルタを用いることにより、能動的消音構成を
簡略化してコストの面から有利にでき、且つ能動的消音
を良好に行うことができる能動的消音システムを提供す
ることを目的とする。The present invention has been made in view of the above circumstances, and it is possible to divide a part of the space in a duct into a plurality of small-diameter ducts to reduce noise that can be silenced to a predetermined frequency band. By providing an adaptive control operation unit that calculates a noise reduction signal generation filter only for one representative small-diameter duct, and using the noise reduction signal generation filter calculated by the adaptive control calculation unit for the other small-diameter ducts, active noise reduction is achieved. It is an object of the present invention to provide an active noise reduction system that can simplify the configuration and be advantageous in terms of cost, and can perform active noise reduction satisfactorily.
【００１６】[0016]
【課題を解決するための手段】上記目的を達成するため
に本発明は、消音用音波発生部より上流側に設けられダ
クト内に伝搬する騒音を検知する第１センサと、消音用
音波発生部より下流側に設けられ前記ダクト内の消音状
況を検知する第２センサと、前記第１センサおよび第２
センサの検知出力よりダクト内伝搬騒音に対して逆位相
同音圧となる消音用信号を演算する演算部と、前記演算
部において算出された消音用信号を音波発生部よりダク
ト内に放射することによってダクト内伝搬騒音を消音す
る能動的消音システムにおいて、ダクト内空間の一部を
複数の小口径ダクトに分割し、前記分割した複数小口径
ダクトのうち１つを代表小口径ダクトとし、代表小口径
ダクトには第１センサ、第２センサ、消音用音波発生部
を設置し、非代表小口径ダクトには第１センサ、消音用
音波発生部を設置し、前記代表小口径ダクト内伝搬騒音
に対する消音用音波の生成手段として、前記第１センサ
および第２センサの検知出力より消音用信号発生フィル
タを算出する適応制御演算部と、前記第１センサの検知
出力が入力され前記適応制御演算部で算出した消音用信
号発生フィルタを畳み込み演算して消音用信号を消音用
音波発生部に出力する畳み込み演算部を備え、前記非代
表小口径ダクト内伝搬騒音に対する消音用音波の生成手
段として、前記第１センサの検知出力が入力され非代表
小口径ダクトと代表小口径ダクトの騒音の伝達特性を補
正する補正フィルタと、前記補正フィルタの出力が加え
られ前記適応制御演算部で算出した消音用信号発生フィ
ルタを畳み込み演算して消音用信号を消音用音波発生部
に出力する畳み込み演算部を備えたことを特徴とするも
のである。SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a first sensor provided upstream of a sound-absorbing sound wave generator for detecting noise propagating in a duct, and a sound-absorbing sound wave generator. A second sensor provided at a more downstream side to detect a muffling state in the duct; and a first sensor and a second sensor.
A calculation unit for calculating a noise reduction signal having an opposite phase and the same sound pressure with respect to the propagation noise in the duct from a detection output of the sensor, and radiating the noise reduction signal calculated in the calculation unit into the duct from the sound wave generator. In an active noise reduction system that silences propagation noise in a duct, a part of the space in the duct is divided into a plurality of small-diameter ducts, and one of the divided small-diameter ducts is set as a representative small-diameter duct; A first sensor, a second sensor, and a sound-absorbing sound-generating unit are installed in the caliber duct, and a first sensor and a sound-absorbing sound-generating unit are installed in the non-representative small-diameter duct. An adaptive control operation unit configured to calculate a muffling signal generation filter from the detection outputs of the first sensor and the second sensor as a means for generating a muffling sound wave; A convolution operation unit that performs convolution operation on the noise reduction signal generation filter calculated by the adaptive control operation unit and outputs a noise reduction signal to the noise reduction sound wave generation unit, and generates a noise reduction sound wave for the non-representative small-diameter duct propagation noise. As means, a correction filter to which the detection output of the first sensor is input to correct the noise transmission characteristics of the non-representative small-diameter duct and the representative small-diameter duct, and the output of the correction filter are added and calculated by the adaptive control calculation unit And a convolution operation unit that performs convolution operation on the silencing signal generation filter and outputs a silencing signal to the silencing sound wave generation unit.
【００１７】また本発明は、上記能動的消音システムに
おいて、前記分割された各小口径ダクトのうち１つを代
表小口径ダクトとして適応制御演算を行うように設定す
る切り替え手段が設けられ、この切り替え手段は、少な
くとも任意の前記各小口径ダクトに設けられた第１セン
サの検知出力を前記適応制御演算部に入力できるように
切り替えるとともに、前記適応制御演算部で算出された
消音用信号発生フィルタを任意の前記各小口径ダクトに
対応する前記畳み込み演算部で利用できるように切り替
えることを特徴とするものである。Further, the present invention provides the active noise reduction system, wherein switching means is provided for setting one of the divided small-diameter ducts as a representative small-diameter duct to perform an adaptive control operation. The means switches at least a detection output of a first sensor provided in each of the small-diameter ducts so that the detection output can be input to the adaptive control operation unit, and switches the muffling signal generation filter calculated by the adaptive control operation unit. Switching is performed so that it can be used in the convolution operation unit corresponding to each of the small-diameter ducts.
【００１８】また本発明は、上記能動的消音システムに
おいて、前記分割された各小口径ダクトのうち１つを代
表小口径ダクトとして適応制御演算を行うように設定す
る切り替え手段が設けられ、この切り替え手段は、少な
くとも任意の前記各小口径ダクトに設けられた第１セン
サの検知出力を前記適応制御演算部に入力できるように
切り替えるとともに、前記適応制御演算部を備えた前記
畳み込み演算部で算出された消音用信号を任意の前記各
小口径ダクトに設けられた消音用音波発生部に出力でき
るように切り替えることを特徴とするものである。Further, the present invention provides the active noise reduction system, wherein switching means is provided for setting one of the divided small-diameter ducts as a representative small-diameter duct to perform an adaptive control operation. The means switches at least the detection output of the first sensor provided in each of the small-diameter ducts so that the detection output can be input to the adaptive control operation unit, and is calculated by the convolution operation unit including the adaptive control operation unit. The sound signal for noise reduction is switched so as to be output to a sound wave generator for noise reduction provided in any of the small-diameter ducts.
【００１９】また本発明は、上記能動的消音システムに
おいて、前記補正フィルタは前記切り替え手段を用いて
生成されることを特徴とするものである。According to the present invention, in the active noise reduction system, the correction filter is generated by using the switching means.
【００２０】また本発明は、消音用音波発生部より上流
側に設けられダクト内に伝搬する騒音を検知する第１セ
ンサと、消音用音波発生部より下流側に設けられ前記ダ
クト内の消音状況を検知する第２センサと、前記第１セ
ンサおよび第２センサの検知出力よりダクト内伝搬騒音
に対して逆位相同音圧となる消音用信号を演算する演算
部と、前記演算部において算出された消音用信号を音波
発生部よりダクト内に放射することによってダクト内伝
搬騒音を消音する能動的消音システムにおいて、ダクト
内空間の一部を複数の略同一形状の小口径ダクトに分割
し、前記分割した複数小口径ダクトのうち１つを代表小
口径ダクトとし、代表小口径ダクトには第１センサ、第
２センサ、消音用音波発生部を設置し、非代表小口径ダ
クトには第１センサ、消音用音波発生部を設置し、前記
代表小口径ダクト内伝搬騒音に対する消音用音波の生成
手段として、前記第１センサおよび第２センサの検知出
力より消音用信号発生フィルタを算出する適応制御演算
部と、前記第１センサの検知出力が入力され前記適応制
御演算部で算出した消音用信号発生フィルタを畳み込み
演算して消音用信号を消音用音波発生部に出力する畳み
込み演算部を備え、前記非代表小口径ダクト内伝搬騒音
に対する消音用音波の生成手段として、前記第１センサ
の検知出力が入力され前記適応制御演算部で算出した消
音用信号発生フィルタを畳み込み演算して消音用信号を
消音用音波発生部に出力する畳み込み演算部を備えたこ
とを特徴とするものである。Further, the present invention provides a first sensor provided upstream of a sound-absorbing sound generating section for detecting noise propagating in a duct, and a sound-absorbing state in the duct provided downstream of the sound-absorbing sound generating section. A second sensor for detecting a noise, a calculation unit for calculating a noise reduction signal having an opposite phase and the same sound pressure with respect to the propagation noise in the duct based on detection outputs of the first sensor and the second sensor, and a calculation unit configured to calculate the noise reduction signal. In the active noise reduction system that silences the propagation noise in the duct by radiating the noise reduction signal into the duct from the sound wave generator, a part of the space in the duct is divided into a plurality of small-diameter ducts having substantially the same shape, One of the divided small-diameter ducts is used as a representative small-diameter duct, a first sensor, a second sensor, and a sound-generating sound generator for silencing are installed in the representative small-diameter duct, and a first sensor is used in a non-representative small-diameter duct. And an adaptive control operation for installing a noise-reducing sound wave generator and calculating a noise-reducing signal generating filter from detection outputs of the first sensor and the second sensor as a means for generating a sound-reducing sound wave for the propagation noise in the representative small-diameter duct. And a convolution operation unit that receives a detection output of the first sensor, receives the output of the first sensor, performs convolution operation on the muffling signal generation filter calculated by the adaptive control calculation unit, and outputs a muffling signal to the muffling sound wave generation unit, As a means for generating a noise-reducing sound wave with respect to a propagation noise in a non-representative small-diameter duct, a detection output of the first sensor is input and a noise-reducing signal generation filter calculated by the adaptive control calculation unit is convoluted to perform a noise-reducing signal. A convolution operation section for outputting the sound wave to the use sound wave generation section.
【００２１】[0021]
【発明の実施の形態】以下図面を参照して本発明の実施
形態例を詳細に説明する。Embodiments of the present invention will be described below in detail with reference to the drawings.
【００２２】［実施形態例１］図１は本発明の実施形態
例１を示す構成説明斜視図である。[First Embodiment] FIG. 1 is a perspective view illustrating the structure of a first embodiment of the present invention.
【００２３】大口径ダクト１内空間のある一部を例えば
石膏ボードのような遮音性の高い仕切板１０によって小
口径ダクト１Ａ，１Ｂ，１Ｃ，１Ｄに分割する。例え
ば、図１のように曲りダクト部を分割する場合、小口径
ダクト１Ａ，１Ｂと１Ｃ，１Ｄは同一形状とはならない
が、分割されたおのおののダクトの形状が同一でなくと
もかまわない。また、その小口径ダクトの内部に吸音材
１１などで吸音処理を行う場合にも、その処理方法がお
のおのの小口径ダクト１Ａ，１Ｂ，１Ｃ，１Ｄで異なっ
ていてもかまわない。A part of the space inside the large-diameter duct 1 is divided into small-diameter ducts 1A, 1B, 1C and 1D by a partition plate 10 having a high sound insulation property such as a gypsum board. For example, when the bent duct portion is divided as shown in FIG. 1, the small-diameter ducts 1A, 1B and 1C, 1D do not have the same shape, but each of the divided ducts does not have to have the same shape. Also, when sound absorbing processing is performed by the sound absorbing material 11 or the like inside the small-diameter duct, the processing method may be different for each of the small-diameter ducts 1A, 1B, 1C, and 1D.
【００２４】上記の要領で分割された４本の小口径ダク
ト１Ａ，１Ｂ，１Ｃ，１Ｄのうち、ある任意の１つの小
口径ダクトを代表小口径ダクト１Ａとし、例えばマイク
ロホンよりなる第１センサ２Ａおよび例えばマイクロホ
ンよりなる第２センサ４が例えばスピーカよりなる消音
用音波発生部３Ａに対し騒音伝搬の上流側および下流側
にそれぞれ設置される。Of the four small-diameter ducts 1A, 1B, 1C, 1D divided in the above-described manner, one arbitrary small-diameter duct is defined as a representative small-diameter duct 1A, and the first sensor 2A composed of a microphone, for example, In addition, the second sensor 4 composed of, for example, a microphone is installed on the upstream side and the downstream side of the noise propagation with respect to the sound-absorbing sound wave generator 3A composed of, for example, a speaker.
【００２５】また、他の非代表小口径ダクト１Ｂ，１
Ｃ，１Ｄには、それぞれ例えばマイクロホンよりなる第
１センサ２Ｂ，２Ｃ，２Ｄおよび例えばスピーカよりな
る消音用音波発生部３Ｂ，３Ｃ，３Ｄのみを設置する。
この大口径ダクト１を設置する周りの状況によっては、
例えば図１のように、おのおのの第１センサ２Ａ，２
Ｂ，２Ｃ，２Ｄや消音用音波発生部３Ａ，３Ｂ，３Ｃ，
３Ｄをおのおのの小口径ダクト１Ａ，１Ｂ，１Ｃ，１Ｄ
に対して同一条件で設置できない場合もあるが、このよ
うな場合でもかまわない。Also, other non-representative small-diameter ducts 1B, 1
In C and 1D, only the first sensors 2B, 2C, and 2D, each of which includes, for example, a microphone, and the sound-absorbing sound wave generating units 3B, 3C, and 3D, each of which includes, for example, a speaker, are provided.
Depending on the circumstances around the installation of this large-diameter duct 1,
For example, as shown in FIG. 1, each of the first sensors 2A, 2A
B, 2C, 2D and sound-absorbing sound generators 3A, 3B, 3C,
Each 3D is a small-diameter duct 1A, 1B, 1C, 1D
May not be installed under the same conditions, but such a case is acceptable.
【００２６】図２は本発明の実施形態例１の制御方法を
説明するための模式図である。FIG. 2 is a schematic diagram for explaining a control method according to the first embodiment of the present invention.
【００２７】適応制御演算部５０は、代表小口径ダクト
１Ａに設置された第１センサ２Ａ、及び第２センサ４の
出力信号３１Ａ（ＸＡ）、３３（ＥＡ）より、代表小口
径ダクト１Ａに対する消音用信号発生フィルタ（Ｗ）２
０を生成する適応制御演算を行い、同時に消音用信号３
２Ａ（ＹＡ）を生成する畳み込み演算を行う。この代表
小口径ダクト１Ａに対する消音用信号３２Ａを代表小口
径ダクト１Ａに設置された消音用音波発生部３Ａに供給
して、消音用音波発生部３Ａから代表小口径ダクト１Ａ
内に消音用音波を発生させると、代表小口径ダクト１Ａ
は消音できる騒音が高い周波数帯域になる小口径ダクト
に制御を行ったのと同等の消音効果が得られる。The adaptive control operation unit 50 silences the representative small-diameter duct 1A based on the output signals 31A (XA) and 33 (EA) of the first sensor 2A and the second sensor 4 installed in the representative small-diameter duct 1A. Signal generation filter (W) 2
The adaptive control operation for generating 0 is performed, and at the same time, the silencing signal 3
A convolution operation for generating 2A (YA) is performed. The sound-reducing signal 32A for the representative small-diameter duct 1A is supplied to the sound-reducing sound wave generator 3A installed in the representative small-diameter duct 1A, and the sound-reducing sound generator 3A sends the representative small-diameter duct 1A.
When a sound-absorbing sound wave is generated inside, a typical small-diameter duct 1A
As a result, a noise reduction effect equivalent to that obtained by controlling a small-diameter duct having a high frequency band in which noise can be reduced can be obtained.
【００２８】代表小口径ダクト１Ａに対する適応制御演
算を行って生成された消音用信号発生フィルタ２０は、
代表小口径ダクト１Ａにおける第１センサ２Ａから消音
用音波発生部３Ａへの騒音の伝達特性（ＧＡ）３０Ａの
逆特性を持つ。The noise reduction signal generation filter 20 generated by performing the adaptive control operation on the representative small-diameter duct 1A is
The representative small-diameter duct 1A has a reverse characteristic of a noise transmission characteristic (GA) 30A from the first sensor 2A to the noise-reducing sound wave generator 3A.
【００２９】ここで、代表小口径ダクト１Ａに設置され
た第１センサ２Ａから消音用音波発生部３Ａへの騒音の
伝達特性３０Ａと、他のおのおのの小口径ダクト１Ｂ，
１Ｃ，１Ｄに設置された第１センサ２Ｂ，２Ｃ，２Ｄか
ら消音用音波発生部３Ｂ，３Ｃ，３Ｄへの騒音の伝達特
性３０Ｂ（ＧＢ），３０Ｃ（ＧＣ），３０Ｄ（ＧＤ）を
補正する補正フィルタ２２Ｂ（ＴＢ），２２Ｃ（Ｔ
Ｃ），２２Ｄ（ＴＤ）をあらかじめ作成しておく。Here, the noise transmission characteristic 30A from the first sensor 2A installed in the representative small-diameter duct 1A to the sound-absorbing sound wave generating unit 3A, and the other small-diameter ducts 1B,
Correction for correcting the noise transfer characteristics 30B (GB), 30C (GC), 30D (GD) from the first sensors 2B, 2C, 2D installed in 1C, 1D to the sound-absorbing sound wave generators 3B, 3C, 3D. The filters 22B (TB) and 22C (T
C) and 22D (TD) are created in advance.
【００３０】代表小口径ダクト１Ａ以外のおのおのの小
口径ダクト１Ｂ，１Ｃ，１Ｄに設置された第１センサ２
Ｂ，２Ｃ，２Ｄから出力されたおのおのの信号３１Ｂ
（ＸＢ），３１Ｃ（ＸＣ），３１Ｄ（ＸＤ）を、このあ
らかじめ作成されたおのおのの小口径ダクト１Ｂ，１
Ｃ，１Ｄに対する補正フィルタ２２Ｂ，２２Ｃ，２２Ｄ
と、代表小口径ダクト１Ａに対する適応制御演算によっ
て生成された消音用信号発生フィルタ２０よりコピーさ
れた消音用信号発生フィルタ（Ｗ）２１Ｂ，２１Ｃ，２
１Ｄに畳み込み演算を行う。このおのおのの畳み込み演
算によって得られた消音用信号３２Ｂ（ＹＢ），３２Ｃ
（ＹＣ），３２Ｄ（ＹＤ）は、おのおのの消音用音波発
生部３Ｂ，３Ｃ，３Ｄに出力され、おのおのの小口径ダ
クト１Ｂ，１Ｃ，１Ｄに対する消音用音波となる。The first sensor 2 installed in each of the small-diameter ducts 1B, 1C, 1D other than the representative small-diameter duct 1A
Each signal 31B output from B, 2C, 2D
(XB), 31C (XC), and 31D (XD) are converted into the small-diameter ducts 1B, 1
Correction filters 22B, 22C, 22D for C and 1D
And the noise reduction signal generation filters (W) 21B, 21C, 2 copied from the noise reduction signal generation filter 20 generated by the adaptive control operation for the representative small-diameter duct 1A.
Perform a convolution operation on 1D. The silencing signals 32B (YB) and 32C obtained by the convolution operation of each
(YC) and 32D (YD) are output to the respective sound-absorbing sound wave generators 3B, 3C and 3D, and become sound-absorbing sound waves for the respective small-diameter ducts 1B, 1C and 1D.
【００３１】なお、分割された小口径ダクト１Ａ，１
Ｂ，１Ｃ，１Ｄのうち、どの小口径ダクトを代表小口径
ダクトとするかは、実際設置する場所の状況により出荷
時には決定できないことが多い。分割されたどの小口径
ダクトをも代表小口径ダクトに設定できるよう切り替え
手段を設けておけば、試運転調整時に代表小口径ダクト
を決定することができる。The divided small-diameter ducts 1A, 1A
Which of the small-diameter ducts among B, 1C, and 1D is to be used as the representative small-diameter duct is often not determined at the time of shipment due to the situation of a place where the duct is actually installed. If the switching means is provided so that any of the divided small-diameter ducts can be set as the representative small-diameter duct, the representative small-diameter duct can be determined at the time of the trial operation adjustment.
【００３２】なお、この切り替え手段は、図３のように
各小口径ダクトに対する各畳み込み演算部と適応制御演
算部との間に設け、任意の各小口径ダクトに設けられた
第１センサの検知出力を前記適応制御演算部に入力でき
るように切り替えるとともに、前記適応制御演算部で算
出された消音用信号発生フィルタを任意の前記各小口径
ダクトに対応する前記畳み込み演算部で利用できるよう
に切り替えてもよいし（図３中４０，４１）、図４のよ
うに適応制御演算部を備えた畳み込み演算部と各小口径
ダクトに設置された少なくとも第１センサ及び消音用音
波発生部との間に設け、任意の各小口径ダクトに設けら
れた第１センサの検知出力を前記適応制御演算部に入力
できるように切り替えるとともに、前記適応制御演算部
を備えた前記畳み込み演算部で算出された消音用信号を
任意の前記各小口径ダクトに設けられた消音用音波発生
部に出力できるように切り替えてもよい（図４中４
２）。前者の場合、どの小口径ダクトの畳み込み演算部
の消音用信号発生フィルタＷ２０，２１Ｂ，２１Ｃ，２
１Ｄを生成するかを切り替えられるし、後者の場合、ど
の小口径ダクト１Ａ，１Ｂ，１Ｃ，１Ｄを代表小口径ダ
クトとするかを切り替えることができる。The switching means is provided between each convolution operation unit for each small-diameter duct and the adaptive control operation unit for each small-diameter duct as shown in FIG. 3, and can be detected by a first sensor provided on any small-diameter duct. Switching so that an output can be input to the adaptive control operation unit, and switching so that the muffling signal generation filter calculated by the adaptive control operation unit can be used by the convolution operation unit corresponding to each of the small-diameter ducts. 3 (40, 41 in FIG. 3), or between the convolution operation unit having the adaptive control operation unit as shown in FIG. 4 and at least the first sensor and the sound-absorbing sound wave generation unit installed in each small-diameter duct. The adaptive control operation unit is switched so that a detection output of a first sensor provided in each of the small-diameter ducts can be input to the adaptive control operation unit. The mute signal calculated by the viewing operation unit may be switched so as to be output to the sound-absorbing sound wave generating portion provided on any of the respective small-diameter duct (Fig. 4 of 4
2). In the former case, the muffling signal generation filters W20, 21B, 21C, and 2 of the convolution calculation section of any small-diameter duct.
It is possible to switch whether to generate 1D, and in the latter case, it is possible to switch which of the small-diameter ducts 1A, 1B, 1C, and 1D is to be the representative small-diameter duct.
【００３３】前記の切り替え手段を利用すると、試運転
調整時などに補正フィルタを作成することができる。以
下その方法を記す。When the above-mentioned switching means is used, a correction filter can be created at the time of trial operation adjustment or the like. The method is described below.
【００３４】補正フィルタ２２Ｂ，２２Ｃ，２２Ｄは、
例えば装置の試運転調整時などに、あらかじめ作成され
るものであり、一度作成して不揮発性メモリに格納して
おけば、再度作成する必要はない。The correction filters 22B, 22C and 22D are:
For example, it is created beforehand at the time of test run adjustment of the apparatus, and once created and stored in the nonvolatile memory, there is no need to create it again.
【００３５】補正フィルタ２２Ｂ，２２Ｃ，２２Ｄは、
各小口径ダクト１Ａ，１Ｂ，１Ｃ，１Ｄの第１センサ２
Ａ，２Ｂ，２Ｃ，２Ｄから消音用音波発生部３Ａ，３
Ｂ，３Ｃ，３Ｄまでの騒音の伝達特性（ＧＡ，ＧＢ，Ｇ
Ｃ，ＧＤ）を用いて、ＧＢ・ＧＡ−１，ＧＣ・Ｇ
Ａ−１，ＧＤ・ＧＡ−１とあらわされ、さらに騒音の伝
達特性（ＧＡ，ＧＢ，ＧＣ，ＧＤ）の逆特性を持つ消音
用信号発生フィルタ（ＷＡ，ＷＢ，ＷＣ，ＷＤ）が既知
であれば、それぞれＴＢ＝ＧＢ・ＧＡ−１＝ＷＢ・ＷＡ
−１，ＴＣ＝ＧＣ・ＧＡ−１＝ＷＣ・ＷＡ−１，ＴＤ＝
ＧＤ・ＧＡ−１＝ＷＤ・ＷＡ−１で求められる。The correction filters 22B, 22C and 22D are:
First sensor 2 of each small-diameter duct 1A, 1B, 1C, 1D
A, 2B, 2C, 2D to sound-damping sound wave generators 3A, 3
B, 3C, 3D noise transmission characteristics (GA, GB, G
C, GD) and GB / GA-1, GC ・ G
A-1, GD / GA-1And the transmission of noise
Silence with characteristics opposite to the maximum characteristics (GA, GB, GC, GD)
Known signal generation filters (WA, WB, WC, WD)
Then, TB = GB ・ GA-1= WB / WA
-1, TC = GC ・ GA-1= WC ・ WA-1, TD =
GD / GA-1= WD ・ WA-1Is required.
【００３６】したがって、例えば装置の試運転調整時に
おのおのの各小口径ダクト１Ａ，１Ｂ，１Ｃ，１Ｄの、
第１センサ２Ａ，２Ｂ，２Ｃ，２Ｄから消音用音波発生
部３Ａ，３Ｂ，３Ｃ，３Ｄまでのおのおのの騒音の伝達
特性（ＧＡ，ＧＢ，ＧＣ，ＧＤ）の逆特性を持つ消音用
信号発生フィルタ３０Ａ（ＷＡ），３０Ｂ（ＷＢ），３
０Ｃ（ＷＣ），３０Ｄ（ＷＤ）を生成することで補正フ
ィルタ２２Ｂ，２２Ｃ，２２Ｄを生成することができ
る。補正フィルタの生成方法を図３の補正フィルタ生成
の模式図をもとに説明する。Therefore, for example, at the time of trial operation adjustment of the apparatus, each of the small-diameter ducts 1A, 1B, 1C, 1D
A noise reduction signal generating filter having a reverse characteristic of noise transfer characteristics (GA, GB, GC, GD) from the first sensors 2A, 2B, 2C, 2D to the noise reduction sound wave generators 3A, 3B, 3C, 3D. 30A (WA), 30B (WB), 3
By generating 0C (WC) and 30D (WD), the correction filters 22B, 22C, and 22D can be generated. A method of generating a correction filter will be described based on a schematic diagram of generation of a correction filter in FIG.
【００３７】まず、代表小口径ダクト１Ａの適応制御演
算部５０に設けられた第１センサ出力切り替え手段４０
を代表小口径ダクト１Ａの第１センサ２Ａに、消音用音
波出力切り替え手段を代表小口径ダクト１Ａの消音用音
波発生部３Ａに接続する。First, the first sensor output switching means 40 provided in the adaptive control operation unit 50 of the representative small-diameter duct 1A.
Is connected to the first sensor 2A of the representative small-diameter duct 1A, and the noise-reducing sound wave output switching means is connected to the noise-reducing sound-wave generator 3A of the representative small-diameter duct 1A.
【００３８】ここで通常の消音適応制御演算を行えば消
音用信号発生フィルタ２０は代表小口径ダクト１Ａに対
する消音用信号発生フィルタＷＡとなる。Here, if normal silencing adaptive control calculation is performed, the silencing signal generation filter 20 becomes the silencing signal generation filter WA for the representative small-diameter duct 1A.
【００３９】次に、代表小口径ダクト１Ａの適応制御演
算部５０に設けられた第１センサ出力切り替え手段４０
を小口径ダクト１Ｂの第１センサ２Ｂに、消音用音波出
力切り替え手段を小口径ダクト１Ｂの消音用音波発生部
３Ｂに接続する。Next, the first sensor output switching means 40 provided in the adaptive control operation unit 50 of the representative small-diameter duct 1A.
Is connected to the first sensor 2B of the small-diameter duct 1B, and the sound-muffling sound output switching means is connected to the sound-muffling sound generator 3B of the small-diameter duct 1B.
【００４０】また、代表小口径ダクト１Ａに設置された
第２センサ４を小口径ダクト１Ｂに設置する。ここで通
常の消音適応制御演算を行えば消音用信号発生フィルタ
２０は小口径ダクト１Ｂに対する消音用信号発生フィル
タＷＢとなる。The second sensor 4 installed in the representative small-diameter duct 1A is installed in the small-diameter duct 1B. Here, if normal silencing adaptive control calculation is performed, the silencing signal generating filter 20 becomes the silencing signal generating filter WB for the small-diameter duct 1B.
【００４１】同様に、第１センサ出力切り替え手段４０
を小口径ダクト１Ｃ，１Ｄの第１センサ２Ｃ，２Ｄに、
消音用音波出力切り替え手段を小口径ダクト１Ｃ，１Ｄ
の消音用音波発生部３Ｃ，３Ｄにそれぞれ接続して消音
適応制御演算を行えば消音用信号発生フィルタ２０は、
小口径ダクト１Ｃ，１Ｄに対するそれぞれの消音用信号
発生フィルタＷＣ，ＷＤとなる。Similarly, the first sensor output switching means 40
To the first sensors 2C and 2D of the small-diameter ducts 1C and 1D,
Small-diameter ducts 1C and 1D for sound output switching means for silencing
If the silencing signal generation filter 20 is connected to the silencing sound wave generators 3C and 3D to perform the silencing adaptive control operation,
These are noise reduction signal generation filters WC and WD for the small-diameter ducts 1C and 1D.
【００４２】こうして得られたすべての小口径ダクト１
Ａ，１Ｂ，１Ｃ，１Ｄに対する消音用信号発生フィルタ
ＷＡ，ＷＢ，ＷＣ，ＷＤから補正フィルタＴＢ，ＴＣ，
ＴＤを求めることができる。All the small-diameter ducts 1 thus obtained
The noise reduction signal generation filters WA, WB, WC, WD for A, 1B, 1C, 1D are converted to correction filters TB, TC,
The TD can be determined.
【００４３】なお、前記切り替え手段とは、消音適応制
御演算部への入力アナログ電気信号ならびに出力アナロ
グ電気信号を切り替える手段であり、例えばスイッチな
どを用いることができる。The switching means is a means for switching between an analog electric signal input to the silencing adaptive control operation unit and an analog electric signal output therefrom. For example, a switch can be used.
【００４４】［実施形態例２］図５は本発明の実施形態
例２を示す構成説明斜視図である。[Second Embodiment] FIG. 5 is a perspective view illustrating the structure of a second embodiment of the present invention.
【００４５】大口径ダクト１０１のある一部をその内部
が同一形状となるように小口径ダクト１０１Ａ，１０１
Ｂ，１０１Ｃ，１０１Ｄに分割する。例えば、口径２，
０００ｍｍ×２，０００ｍｍの大口径ダクト１０１の内
部に例えば石膏ボードのような遮音性の高い仕切板１１
０によって口径１，０００ｍｍ×１，０００ｍｍの４つ
の小口径ダクト１０１Ａ，１０１Ｂ，１０１Ｃ，１０１
Ｄとなるように分割する。また、その内部に吸音材１１
１などで吸音処理を行う場合には、どの小口径ダクトに
対しても同等の処理を施す。The small-diameter ducts 101A and 101A are formed so that a part of the large-diameter duct 101 has the same shape inside.
B, 101C and 101D. For example, caliber 2,
A partition plate 11 having a high sound insulation property such as a gypsum board is provided inside a large-diameter duct 101 of 2,000 mm × 2,000 mm.
0, four small-diameter ducts 101A, 101B, 101C, 101 each having a diameter of 1,000 mm × 1,000 mm.
D is divided. Also, the sound absorbing material 11
In the case where the sound absorption processing is performed in step 1 or the like, the same processing is performed on any small-diameter duct.
【００４６】上記の要領で同一条件となるように分割し
た４本の小口径ダクト１０１Ａ，１０１Ｂ，１０１Ｃ，
１０１Ｄのうち、ある任意の１つの小口径ダクトを代表
小口径ダクト１０１Ａとし、例えばマイクロホンよりな
る第１センサ１０２Ａおよび例えばマイクロホンよりな
る第２センサ１０４が、例えばスピーカよりなる消音用
音波発生部１０３Ａに対し騒音伝搬の上流側および下流
側にそれぞれ設置される。The four small-diameter ducts 101A, 101B, 101C, and 101 are divided so as to satisfy the same conditions as described above.
One of the small-diameter ducts 101D is defined as a representative small-diameter duct 101A, and a first sensor 102A including a microphone, for example, and a second sensor 104 including a microphone, for example, are transmitted to a sound-generating sound generation unit 103A including a speaker. On the other hand, they are installed on the upstream and downstream sides of the noise propagation, respectively.
【００４７】また、他の非代表小口径ダクト１０１Ｂ，
１０１Ｃ，１０１Ｄには、例えばマイクロホンよりなる
第１センサ１０２Ｂ，１０２Ｃ，１０２Ｄと例えばスピ
ーカよりなる消音用音波発生部１０３Ｂ，１０３Ｃ，１
０３Ｄのみを設置する。Further, other non-representative small-diameter ducts 101B,
101C and 101D include, for example, first sensors 102B, 102C and 102D composed of microphones and muffling sound generators 103B, 103C and 1 composed of speakers, for example.
Install only 03D.
【００４８】ただし、すべての小口径ダクト１０１Ａ，
１０１Ｂ，１０１Ｃ，１０１Ｄに設置する第１センサ１
０２Ａ，１０２Ｂ，１０２Ｃ，１０２Ｄは、同一の音波
を同一の信号として検知できるよう、また、消音用音波
発生部１０３Ａ，１０３Ｂ，１０３Ｃ，１０３Ｄは、同
一の信号を同一の音波として発生できるよう、すべて同
一設置方法となるように設置する。However, all the small-diameter ducts 101A,
1st sensor 1 installed in 101B, 101C, 101D
02A, 102B, 102C, and 102D are designed to detect the same sound wave as the same signal, and the silencing sound wave generators 103A, 103B, 103C, and 103D are designed to generate the same signal as the same sound wave. Install in the same way.
【００４９】図６は本発明の実施形態例２の制御方法を
説明するための模式図である。FIG. 6 is a schematic diagram for explaining a control method according to the second embodiment of the present invention.
【００５０】適応制御演算部１００は、代表小口径ダク
ト１０１Ａに設置された第１センサ１０２Ａ及び第２セ
ンサ１０４の出力信号１３１Ａ（ＸＡ），１３３（Ｅ
Ａ）より、代表小口径ダクト１０１Ａに対する消音用信
号発生フィルタ（Ｗ）１２０を生成する適応制御演算を
行ない、同時に代表小口径ダクト１０１Ａに対する消音
用信号１３２Ａ（ＹＡ）を生成する畳み込み演算を行な
う。この代表小口径ダクト１０１Ａに対する消音用信号
１３２Ａを代表小口径ダクト１０１Ａに設置された消音
用音波発生部１０３Ａに供給して、消音用音波発生部１
０３Ａから代表小口径ダクト１０１Ａ内に消音用音波を
発生させると、代表小口径ダクト１０１Ａは口径１，０
００ｍｍ×１，０００ｍｍダクトに制御を行なったのと
同等の消音できる騒音が高い周波数帯域になる消音効果
が得られる。The adaptive control operation unit 100 outputs signals 131A (XA) and 133 (E) of the first sensor 102A and the second sensor 104 installed in the representative small-diameter duct 101A.
A), the adaptive control operation for generating the noise reduction signal generation filter (W) 120 for the representative small-diameter duct 101A is performed, and the convolution calculation for generating the noise reduction signal 132A (YA) for the representative small-diameter duct 101A is performed at the same time. The noise reduction signal 132A for the representative small diameter duct 101A is supplied to the noise reduction sound generator 103A installed in the representative small diameter duct 101A, and the noise reduction sound generator 1A is provided.
When a sound-absorbing sound wave is generated in the representative small-diameter duct 101A from 03A, the representative small-diameter duct 101A has a diameter of 1.0
As a result, the noise can be reduced, which is equivalent to that obtained when control is performed on a duct of 00 mm × 1,000 mm.
【００５１】代表小口径ダクト１０１Ａに対する適応制
御演算を行って生成された消音用信号発生フィルタ１２
０は、代表小口径ダクト１０１Ａにおける第１センサ１
０２Ａから消音用音波発生部１０３Ａへの騒音の伝達特
性（ＧＡ）１３０Ａの逆特性を持つ。The noise reduction signal generation filter 12 generated by performing the adaptive control operation on the representative small-diameter duct 101A.
0 is the first sensor 1 in the representative small-diameter duct 101A.
The noise transmission characteristic (GA) 130A has a characteristic opposite to that of the noise transmission characteristic (GA) 130A from the second sound generation unit 02A to the noise-reducing sound wave generation unit 103A.
【００５２】ここで、大口径ダクト１０１のある一部を
その内部が同一形状となるように分割し、かつすべての
小口径ダクト１０１Ａ，１０１Ｂ，１０１Ｃ，１０１Ｄ
に対し同一設置方法で第１センサ１０２Ａ，１０２Ｂ，
１０２Ｃ，１０２Ｄ、消音用音波発生部１０３Ａ，１０
３Ｂ，１０３Ｃ，１０３Ｄを設置しているため、代表小
口径ダクト１０１Ａにおける第１センサ１０２Ａから消
音用音波発生部１０３Ａへの騒音の伝達特性（ＧＡ）１
３０Ａと、他のおのおのの小口径ダクト１０１Ｂ，１０
１Ｃ，１０１Ｄに設置された第１センサ１０２Ｂ，１０
２Ｃ，１０２Ｄから消音用音波発生部１０３Ｂ，１０３
Ｃ，１０３Ｄへの騒音の伝達特性１３０Ｂ（ＧＢ），１
３０Ｃ（ＧＣ），１３０Ｄ（ＧＤ）が等しくなり、代表
小口径ダクト１０１Ａに対する消音用信号発生フィルタ
１２０は、他の小口径ダクト１０１Ｂ，１０１Ｃ，１０
１Ｄの消音用信号発生フィルタ（Ｗ）１２１Ｂ，１２１
Ｃ，１２１Ｄともなりうる。Here, a part of the large-diameter duct 101 is divided so that the inside thereof has the same shape, and all the small-diameter ducts 101A, 101B, 101C and 101D are divided.
To the first sensors 102A, 102B,
102C, 102D, sound-absorbing sound generators 103A, 103
Since 3B, 103C, and 103D are installed, noise transmission characteristics (GA) 1 from the first sensor 102A to the noise-reducing sound wave generating unit 103A in the representative small-diameter duct 101A are 1
30A and other small-diameter ducts 101B and 10B.
First sensors 102B, 10 installed in 1C, 101D
2C, 102D to sound-absorbing sound wave generators 103B, 103
C, transmission characteristic 130B (GB) of noise to 103D, 1
30C (GC) and 130D (GD) are equal, and the noise reduction signal generating filter 120 for the representative small-diameter duct 101A is different from the other small-diameter ducts 101B, 101C, and 10D.
1D silencing signal generation filter (W) 121B, 121
C, 121D.
【００５３】したがって、この代表小口径ダクト１０１
Ａに対する適応制御によって得られた消音用信号発生フ
ィルタ１２０を他の小口径ダクト１０１Ｂ，１０１Ｃ，
１０１Ｄの数分だけコピーし、他の小口径ダクトに設置
したおのおのの第１センサ１０２Ｂ，１０２Ｃ，１０２
Ｄからの出力信号１３１Ｂ（ＸＢ），１３１Ｃ（Ｘ
Ｃ），１３１Ｄ（ＸＤ）と畳み込み演算する。このおの
おのの畳み込み演算で得られた消音用信号１３２Ｂ（Ｙ
Ｂ），１３２Ｃ（ＹＣ），１３２Ｄ（ＹＤ）をそれぞれ
対応した消音用音波発生部１０３Ｂ，１０３Ｃ，１０３
Ｄに供給し、この消音用音波発生部１０３Ｂ，１０３
Ｃ，１０３Ｄからおのおのの小口径ダクト１０１Ｂ，１
０１Ｃ，１０１Ｄに対する消音用音波を発生する。Therefore, this representative small-diameter duct 101
The noise reduction signal generation filter 120 obtained by the adaptive control for A is connected to the other small-diameter ducts 101B, 101C,
Each of the first sensors 102B, 102C, 102 installed in another small-diameter duct is copied for a few minutes of 101D.
D output signals 131B (XB) and 131C (X
C), and convolution operation with 131D (XD). The muffling signal 132B (Y
B), 132C (YC), and 132D (YD) corresponding to the sound-absorbing sound wave generators 103B, 103C, 103, respectively.
D, and the sound-damping sound wave generators 103B and 103B.
Small-diameter ducts 101B, 1 from C, 103D
A sound-absorbing sound wave is generated for 01C and 101D.
【００５４】したがって、おのおのの畳み込み演算によ
って得られた消音用信号１３２Ｂ，１３２Ｃ，１３２Ｄ
に応じた消音用音波をおのおのの消音用音波発生部１０
３Ｂ，１０３Ｃ，１０３Ｄから小口径ダクト１０１Ｂ，
１０１Ｃ，１０１Ｄに放射することで小口径ダクト１０
１Ｂ，１０１Ｃ，１０１Ｄに伝搬する騒音も口径１，０
００ｍｍ×１，０００ｍｍダクトに制御を行なったのと
同等の消音できる騒音が高い周波数帯域になる消音効果
が得られる。Therefore, the silencing signals 132B, 132C, 132D obtained by the respective convolution operations
The sound-absorbing sound wave generator 10 for each of the sound-absorbing sound waves according to
3B, 103C, 103D to small diameter duct 101B,
The small-diameter duct 10 is radiated to 101C and 101D.
The noise propagating to 1B, 101C, and 101D also has a diameter of 1,0.
As a result, the noise can be reduced, which is equivalent to that obtained when control is performed on a duct of 00 mm × 1,000 mm.
【００５５】以上のように、本発明の実施形態例１の場
合、演算部が１つの適応制御演算と４つの畳み込み演算
を行うので、大口径のダクトでも、演算部にかかるコス
トを低く抑えながら、小口径ダクトと同等の性能が出せ
る。また大口径のダクトの内部を同一形状に分割できな
かったり、第１センサや消音用音波発生部が同一条件で
設置できなくても同じ性能が出せる。さらに分割された
どの小口径ダクトをも代表小口径ダクトに設定できるよ
う切り替え手段を設けることにより、試運転調整時に代
表小口径ダクトを決定することができる。As described above, in the case of the first embodiment of the present invention, since the arithmetic unit performs one adaptive control operation and four convolution operations, the cost of the arithmetic unit can be reduced even with a large-diameter duct. And performance equivalent to a small-diameter duct. In addition, the same performance can be obtained even if the inside of the large-diameter duct cannot be divided into the same shape, or if the first sensor and the sound-generating sound generation unit cannot be installed under the same conditions. Further, by providing the switching means so that any of the divided small-diameter ducts can be set as the representative small-diameter duct, the representative small-diameter duct can be determined at the time of the trial operation adjustment.
【００５６】また、本発明の実施形態例２の場合、演算
部が１つの適応制御演算と４つの畳み込み演算を行うの
で、大口径のダクトでも、演算部にかかるコストを低く
抑えながら、小口径ダクトと同等の性能が出せる。Further, in the case of the second embodiment of the present invention, the arithmetic unit performs one adaptive control operation and four convolution operations, so that even with a large-diameter duct, the cost for the arithmetic unit can be kept low and the small-diameter duct can be reduced. Performance equivalent to a duct can be obtained.
【００５７】[0057]
【発明の効果】以上述べたように本発明によれば、ダク
ト内空間の一部を複数の小口径ダクトに分割して消音で
きる騒音を所定の周波数帯域にすることができ、さら
に、１つの代表小口径ダクトにのみ消音用信号発生フィ
ルタを算出する適応制御演算部を設け、他の小口径ダク
トには前記適応制御演算部で算出した消音用信号発生フ
ィルタを用いることにより、能動的消音構成を簡略化し
てコストの面から有利にでき、且つ能動的消音を良好に
行うことができる能動的消音システムを提供することが
できる。As described above, according to the present invention, it is possible to divide a part of the space in the duct into a plurality of small-diameter ducts so that noise that can be reduced can be set in a predetermined frequency band. An active noise reduction configuration is provided by providing an adaptive control operation unit that calculates a noise reduction signal generation filter only for the representative small-diameter duct, and using the noise reduction signal generation filter calculated by the adaptive control calculation unit for the other small-diameter ducts. Can be simplified, the cost can be advantageously reduced, and an active noise reduction system that can perform active noise reduction satisfactorily can be provided.
【図１】本発明の実施形態例１を示す構成説明斜視図で
ある。FIG. 1 is a configuration explanatory perspective view showing a first embodiment of the present invention.
【図２】本発明の実施形態例１に係る制御方法を説明す
るための模式図である。FIG. 2 is a schematic diagram for explaining a control method according to Embodiment 1 of the present invention.
【図３】本発明の実施形態例１に係る代表小口径ダクト
決定のための切り替え手段を説明するための模式図であ
る。FIG. 3 is a schematic diagram for explaining a switching unit for determining a representative small-diameter duct according to the first embodiment of the present invention.
【図４】本発明の実施形態例１に係る代表小口径ダクト
決定のための切り替え手段を説明するための模式図であ
る。FIG. 4 is a schematic diagram for explaining a switching unit for determining a representative small-diameter duct according to the first embodiment of the present invention.
【図５】本発明の実施形態例２を示す構成説明斜視図で
ある。FIG. 5 is a configuration explanatory perspective view showing a second embodiment of the present invention.
【図６】本発明の実施形態例２に係る制御方法を説明す
るための模式図である。FIG. 6 is a schematic diagram for explaining a control method according to Embodiment 2 of the present invention.
【図７】従来の能動騒音制御装置を示す構成説明図であ
る。FIG. 7 is an explanatory diagram showing a configuration of a conventional active noise control device.
１ 大口径ダクト １Ａ 代表小口径ダクト １Ｂ，１Ｃ，１Ｄ 小口径ダクト ２Ａ，２Ｂ，２Ｃ，２Ｄ 第１センサ ３Ａ，３Ｂ，３Ｃ，３Ｄ 消音用音波発生部 ４ 第２センサ １０ 仕切板 １１ 吸音材 ２０ 消音用信号発生フィルタ ２１Ｂ，２１Ｃ，２１Ｄ 消音用信号発生フィルタ２０
よりコピーされた消音用信号発生フィルタ ２２Ａ，２２Ｂ，２２Ｃ，２２Ｄ 補正フィルタ ４０ 第１センサ入力の切り替え手段 ４１ 適応制御演算出力の切り替え手段 ４２ 第１センサ入力および消音用信号出力の切り替え
手段DESCRIPTION OF SYMBOLS 1 Large-diameter duct 1A Representative small-diameter duct 1B, 1C, 1D Small-diameter duct 2A, 2B, 2C, 2D First sensor 3A, 3B, 3C, 3D Sound-absorbing sound wave generator 4 Second sensor 10 Partition plate 11 Sound absorbing material 20 Silencer signal generation filter 21B, 21C, 21D Silencer signal generation filter 20
Noise-coupling signal generating filters 22A, 22B, 22C, 22D copied from the correction filter 40 Switching means for first sensor input 41 Switching means for adaptive control operation output 42 Switching means for first sensor input and signal output for noise reduction
Claims (5)
ダクト内に伝搬する騒音を検知する第１センサと、消音
用音波発生部より下流側に設けられ前記ダクト内の消音
状況を検知する第２センサと、前記第１センサおよび第
２センサの検知出力よりダクト内伝搬騒音に対して逆位
相同音圧となる消音用信号を演算する演算部と、前記演
算部において算出された消音用信号を音波発生部よりダ
クト内に放射することによってダクト内伝搬騒音を消音
する能動的消音システムにおいて、 ダクト内空間の一部を複数の小口径ダクトに分割し、 前記分割した複数小口径ダクトのうち１つを代表小口径
ダクトとし、 代表小口径ダクトには第１センサ、第２センサ、消音用
音波発生部を設置し、 非代表小口径ダクトには第１センサ、消音用音波発生部
を設置し、 前記代表小口径ダクト内伝搬騒音に対する消音用音波の
生成手段として、前記第１センサおよび第２センサの検
知出力より消音用信号発生フィルタを算出する適応制御
演算部と、前記第１センサの検知出力が入力され前記適
応制御演算部で算出した消音用信号発生フィルタを畳み
込み演算して消音用信号を消音用音波発生部に出力する
畳み込み演算部を備え、 前記非代表小口径ダクト内伝搬騒音に対する消音用音波
の生成手段として、前記第１センサの検知出力が入力さ
れ非代表小口径ダクトと代表小口径ダクトの騒音の伝達
特性を補正する補正フィルタと、前記補正フィルタの出
力が加えられ前記適応制御演算部で算出した消音用信号
発生フィルタを畳み込み演算して消音用信号を消音用音
波発生部に出力する畳み込み演算部を備えたことを特徴
とする能動的消音システム。A first sensor for detecting noise propagating in the duct, which is provided on an upstream side of the sound-generating sound-generating unit; and a first sensor provided on a downstream side of the sound-generating sound-generating unit, for detecting a muffling state in the duct. A second sensor, a calculation unit for calculating a noise reduction signal having opposite phase and same sound pressure with respect to the propagation noise in the duct based on detection outputs of the first sensor and the second sensor, and a noise reduction signal calculated by the calculation unit. In an active noise reduction system that silences propagation noise in a duct by radiating a signal into a duct from a sound wave generator, a part of the space in the duct is divided into a plurality of small-diameter ducts, and the divided multiple small-diameter ducts are divided. One of the ducts is a representative small-diameter duct, the first small-diameter duct is equipped with a first sensor, a second sensor, and a sound-absorbing sound generator. The non-representative small-diameter duct is equipped with a first sensor and a sound-absorbing sound generator. An adaptive control operation unit configured to calculate a silencing signal generation filter from detection outputs of the first sensor and the second sensor as a means for generating a silencing sound wave with respect to the propagation noise in the representative small-diameter duct; And a convolution operation unit that receives the detection output of the above and performs convolution operation on the silencing signal generation filter calculated by the adaptive control operation unit, and outputs a silencing signal to the silencing sound wave generation unit, and the non-representative small-diameter duct propagation. As a means for generating a noise-reducing sound wave for noise, a detection filter of the first sensor is input, and a correction filter that corrects noise transfer characteristics of the non-representative small-diameter duct and the representative small-diameter duct, and an output of the correction filter are added. A convolution operation unit that performs convolution operation on the silencing signal generation filter calculated by the adaptive control operation unit and outputs a silencing signal to the silencing sound wave generation unit. Active silencer system characterized by a.
つを代表小口径ダクトとして適応制御演算を行うように
設定する切り替え手段が設けられ、この切り替え手段
は、少なくとも任意の前記各小口径ダクトに設けられた
第１センサの検知出力を前記適応制御演算部に入力でき
るように切り替えるとともに、前記適応制御演算部で算
出された消音用信号発生フィルタを任意の前記各小口径
ダクトに対応する前記畳み込み演算部で利用できるよう
に切り替えることを特徴とする請求項１記載の能動的消
音システム。2. One of said divided small-diameter ducts.
Switching means for setting one of the small-diameter ducts as a representative small-diameter duct, and the switching means determines at least a detection output of a first sensor provided in any of the small-diameter ducts by the adaptive-control calculation. And a switching unit that switches the muffling signal generation filter calculated by the adaptive control operation unit so that it can be used by the convolution operation unit corresponding to any of the small-diameter ducts. Item 7. The active noise reduction system according to Item 1.
つを代表小口径ダクトとして適応制御演算を行うように
設定する切り替え手段が設けられ、この切り替え手段
は、少なくとも任意の前記各小口径ダクトに設けられた
第１センサの検知出力を前記適応制御演算部に入力でき
るように切り替えるとともに、前記適応制御演算部を備
えた前記畳み込み演算部で算出された消音用信号を任意
の前記各小口径ダクトに設けられた消音用音波発生部に
出力できるように切り替えることを特徴とする請求項１
記載の能動的消音システム。3. One of the divided small-diameter ducts.
Switching means for setting one of the small-diameter ducts as a representative small-diameter duct, and the switching means determines at least a detection output of a first sensor provided in any of the small-diameter ducts by the adaptive-control calculation. Switching so that it can be input to the unit, and so that the muffling signal calculated by the convolution calculation unit having the adaptive control calculation unit can be output to a muffling sound wave generation unit provided in each of the small-diameter ducts. 2. The method according to claim 1, wherein the switching is performed.
An active silencing system as described.
用いて生成されることを特徴とする請求項２または３記
載の能動的消音システム。4. The active noise reduction system according to claim 2, wherein the correction filter is generated using the switching unit.
ダクト内に伝搬する騒音を検知する第１センサと、消音
用音波発生部より下流側に設けられ前記ダクト内の消音
状況を検知する第２センサと、前記第１センサおよび第
２センサの検知出力よりダクト内伝搬騒音に対して逆位
相同音圧となる消音用信号を演算する演算部と、前記演
算部において算出された消音用信号を音波発生部よりダ
クト内に放射することによってダクト内伝搬騒音を消音
する能動的消音システムにおいて、 ダクト内空間の一部を複数の略同一形状の小口径ダクト
に分割し、 前記分割した複数小口径ダクトのうち１つを代表小口径
ダクトとし、 代表小口径ダクトには第１センサ、第２センサ、消音用
音波発生部を設置し、 非代表小口径ダクトには第１センサ、消音用音波発生部
を設置し、 前記代表小口径ダクト内伝搬騒音に対する消音用音波の
生成手段として、前記第１センサおよび第２センサの検
知出力より消音用信号発生フィルタを算出する適応制御
演算部と、前記第１センサの検知出力が入力され前記適
応制御演算部で算出した消音用信号発生フィルタを畳み
込み演算して消音用信号を消音用音波発生部に出力する
畳み込み演算部を備え、 前記非代表小口径ダクト内伝搬騒音に対する消音用音波
の生成手段として、前記第１センサの検知出力が入力さ
れ前記適応制御演算部で算出した消音用信号発生フィル
タを畳み込み演算して消音用信号を消音用音波発生部に
出力する畳み込み演算部を備えたことを特徴とする能動
的消音システム。5. A first sensor provided upstream of the sound-muffling sound generator to detect noise propagating in the duct, and a first sensor provided downstream of the sound-muffling sound generator to detect a muffling state in the duct. A second sensor, a calculation unit for calculating a noise reduction signal having opposite phase and same sound pressure with respect to the propagation noise in the duct based on detection outputs of the first sensor and the second sensor, and a noise reduction signal calculated by the calculation unit. In an active noise reduction system in which a signal is radiated from a sound wave generator into a duct to mitigate propagation noise in the duct, a part of the space in the duct is divided into a plurality of small-diameter ducts having substantially the same shape. One of the small-diameter ducts is designated as a representative small-diameter duct, the first small-diameter duct is equipped with a first sensor, a second sensor, and a sound-generating unit for silencing. An adaptive control operation unit that installs a wave generation unit, and calculates a noise reduction signal generation filter from detection outputs of the first sensor and the second sensor as a noise reduction sound wave generation unit for the representative small-diameter duct propagation noise; A convolution operation unit that receives a detection output of the first sensor, performs convolution operation on a silencing signal generation filter calculated by the adaptive control operation unit, and outputs a silencing signal to a sound-absorbing sound wave generation unit; As means for generating a noise-reducing sound wave for the propagation noise in the bore duct, the detection output of the first sensor is input, and the noise-reducing signal generation filter calculated by the adaptive control calculation unit is convoluted to calculate the noise-reducing signal. An active noise reduction system comprising a convolution operation section for outputting to a section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23067299A JP4298865B2 (en) | 1999-08-17 | 1999-08-17 | Active silencer system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23067299A JP4298865B2 (en) | 1999-08-17 | 1999-08-17 | Active silencer system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001056691A true JP2001056691A (en) | 2001-02-27 |
| JP4298865B2 JP4298865B2 (en) | 2009-07-22 |
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ID=16911501
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23067299A Expired - Fee Related JP4298865B2 (en) | 1999-08-17 | 1999-08-17 | Active silencer system |
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| Country | Link |
|---|---|
| JP (1) | JP4298865B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002366161A (en) * | 2001-06-04 | 2002-12-20 | Denso Corp | Noise controller |
| KR100895990B1 (en) * | 2008-03-27 | 2009-05-07 | 주식회사 한성기건 | A horizontal type dust collector with baffle and up flow exhaust system |
-
1999
- 1999-08-17 JP JP23067299A patent/JP4298865B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002366161A (en) * | 2001-06-04 | 2002-12-20 | Denso Corp | Noise controller |
| JP4581293B2 (en) * | 2001-06-04 | 2010-11-17 | 株式会社デンソー | Noise control device |
| KR100895990B1 (en) * | 2008-03-27 | 2009-05-07 | 주식회사 한성기건 | A horizontal type dust collector with baffle and up flow exhaust system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4298865B2 (en) | 2009-07-22 |
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