JP3072174B2 - Active silencer in three-dimensional space - Google Patents
Active silencer in three-dimensional spaceInfo
- Publication number
- JP3072174B2 JP3072174B2 JP4032029A JP3202992A JP3072174B2 JP 3072174 B2 JP3072174 B2 JP 3072174B2 JP 4032029 A JP4032029 A JP 4032029A JP 3202992 A JP3202992 A JP 3202992A JP 3072174 B2 JP3072174 B2 JP 3072174B2
- Authority
- JP
- Japan
- Prior art keywords
- sound
- noise
- dimensional space
- detecting means
- active
- 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
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
- Duct Arrangements (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は三次元空間の能動的消音
を行う装置に係り、例えば空気調和機の吸い込み口から
のファンの電磁音、羽根回転音等の周期音またはランダ
ム音に起因した騒音を三次元空間内で能動的に打ち消す
のに好適な装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for performing active noise reduction in a three-dimensional space, which is caused by a periodic sound such as a fan electromagnetic sound from a suction port of an air conditioner, a blade rotation sound, or a random sound. The present invention relates to a device suitable for actively canceling noise in a three-dimensional space.
【０００２】[0002]
【従来の技術】従来、例えば空調機の低騒音化を図るた
めに空調機の騒音源となる振動を防止するなどの音源制
御と共に吸音、遮音等を行う受動的方法が行われてい
る。しかし近年、音の波動性を利用して、音で音を打ち
消す能動的消音方法が試みられてきており、既に、空調
ダクトなど一次元的に騒音が伝播する場合に実用化され
ている。この方法を図１２を用いて説明する。2. Description of the Related Art Conventionally, in order to reduce the noise of an air conditioner, for example, a passive method of performing sound absorption control, sound absorption, and the like together with sound source control such as prevention of vibration which is a noise source of the air conditioner has been performed. However, in recent years, an active silencing method for canceling sound with sound by utilizing the wave nature of sound has been attempted, and has already been put to practical use when one-dimensional noise propagates in an air conditioning duct or the like. This method will be described with reference to FIG.
【０００３】上流（図１２の左側）からの騒音を騒音検
出手段１で測定し電気信号としてコントローラ４に送
り、コントローラ４で解析し、能動消音すべく逆位相の
音として発音手段２からダクト内に放射する。消音効果
を消音効果検出手段３によって測定し、これに基づきコ
ントローラ４で発音手段２への出力信号を補正すること
によって、消音効果検出手段３の位置で常に消音される
ようにする。The noise from the upstream (left side in FIG. 12) is measured by the noise detecting means 1 and sent to the controller 4 as an electric signal, analyzed by the controller 4, and is outputted from the sounding means 2 to the inside of the duct as a sound of the opposite phase for active silencing. To radiate. The muffling effect is measured by the muffling effect detecting means 3, and the controller 4 corrects the output signal to the sound generating means 2 based on this, so that the muffling effect is always muted at the position of the muffling effect detecting means 3.
【０００４】このようにして、消音効果検出手段３より
下流側（図１２の右側）において消音される。ここでコ
ントローラ４には、デジタル信号処理により、適応アル
ゴリズムに従って随時変化する適応フィルターが使用さ
れている。また、コントローラ４には固定フィルター５
も使用されており、デジタル信号処理を行なう上で、固
定フィルター５には、図１３で示す通り、消音効果検出
手段３からコントローラ４への出力信号の電圧Ｖ3 とコ
ントローラ４から発音手段２への入力信号の電圧Ｖ2 と
の比で定義される伝達関数の実測値Ｈ0 が入る。実際の
実測時においては、コントローラ４からＭ系列の音波信
号を出力して発音手段２から放射し、その時の消音効果
検出手段３から戻ってくる音波信号からＨ0 を求める。
これにより、発音手段２と消音効果検出手段３との間の
距離、ダクト内の反響特性、及び、発音手段２と消音効
果検出手段３の機器特性が取り込まれ、消音時にこれら
に対する補正が可能となる。なお、コントローラ４内の
適応アルゴリズムの制御内容については説明を省略す
る。In this way, the sound is silenced on the downstream side (right side in FIG. 12) of the silencing effect detecting means 3. Here, the controller 4 uses an adaptive filter that changes as needed according to an adaptive algorithm by digital signal processing. The controller 4 includes a fixed filter 5.
In performing digital signal processing, the fixed filter 5 includes, as shown in FIG. 13, a voltage V 3 of an output signal from the muffling effect detecting means 3 to the controller 4 and a signal from the controller 4 to the sound generating means 2. Found H 0 of the transfer function defined by the ratio of the voltage V 2 of the input signal falls. At the time of actual measurement, the controller 4 outputs an M-sequence sound signal, emits the sound signal from the sound generator 2, and obtains H 0 from the sound signal returned from the muffling effect detector 3 at that time.
As a result, the distance between the sound generator 2 and the muffling effect detector 3, the reverberation characteristics in the duct, and the device characteristics of the sounder 2 and the muffling effect detector 3 are taken in, so that they can be corrected at the time of muffling. Become. The description of the control contents of the adaptive algorithm in the controller 4 is omitted.
【０００５】ところで、三次元空間内を対象とした能動
形消音は、三次元空間内に放射される音波の干渉が一次
元空間内でのそれとは異なるため、ダクト内等の一次元
音波の能動形消音を行う場合とは異なる。理想的には、
発音手段の位置を騒音源と一致させ、騒音源から放射す
る音波と逆位相、同振幅かつ同波長の音波を該発音手段
から放射すれば、音波の破壊干渉となり、三次元空間内
全体で消音が可能となる。ところが、現実には発音手段
の位置を騒音源と全く同じ位置にすることは不可能であ
るから、三次元空間内での能動的消音においては、複数
個の発音手段を騒音源の近く（少なくとも波長の１／２
以内）に置かなければならない。その場合の消音効果
は、波長と騒音源の大きさに依存する。つまり、音の波
長が長く（つまり低周波数）、音源が小さいほど消音効
果が大きい。これは、騒音源からの音が、点音源からの
無指向性の音に近似したものとなるからである。逆に、
音の波長が短く（つまり高周波数）、または、音源が大
きい場合には、騒音に指向性があるため、能動形消音に
よる効果がない。[0005] By the way, in active silence in a three-dimensional space, the interference of sound waves emitted in the three-dimensional space is different from that in the one-dimensional space. It is different from the case of performing form silencing. Ideally,
If the position of the sound generator is matched with the noise source and a sound wave of opposite phase, same amplitude and same wavelength as the sound wave emitted from the noise source is emitted from the sound generator, the sound wave will be destructively interfered and silenced in the entire three-dimensional space. Becomes possible. However, in reality, it is impossible to make the position of the sound generating means exactly the same as the position of the noise source. Therefore, in active silencing in a three-dimensional space, a plurality of sound generating means are placed near the noise source (at least at the sound source). 1/2 wavelength
Within). The silencing effect in that case depends on the wavelength and the size of the noise source. In other words, the longer the wavelength of the sound (that is, the lower frequency) and the smaller the sound source, the greater the silencing effect. This is because the sound from the noise source approximates the omnidirectional sound from the point sound source. vice versa,
If the wavelength of the sound is short (that is, high frequency) or the sound source is large, the noise has directivity, so that there is no effect of the active silencing.
【０００６】特開平２−６１４５０号公報等には、空調
室内機において、ファン等の機器から生じる騒音を受け
る第１受音手段と、前記第１受音手段で受けた波形の位
相を変換する位相変換手段と、前記位相変換手段からの
波形信号を音に変える発音手段と、前記発音手段から発
生する音と元々の騒音との合成音を検出する第２受音手
段と、前記第２受音手段で受音した音と前記第１受音手
段で受音した音のレベルを各々判定しレベル調整と位相
調整を行う制御手段とを設け、前記制御手段により前記
第２受音手段で受音した合成音を消音する方法が記載さ
れているが、指向性を有する騒音に対して三次元空間全
体において能動的消音をするためには、技術的には、こ
れだけでは不十分である。Japanese Patent Application Laid-Open No. 2-61450 discloses that in an air-conditioning indoor unit, a first sound receiving means for receiving noise generated from a device such as a fan and a phase of a waveform received by the first sound receiving means are converted. Phase converting means, sound generating means for converting a waveform signal from the phase converting means into sound, second sound receiving means for detecting a synthesized sound of a sound generated from the sound generating means and original noise, and second sound receiving means. Control means for judging the level of the sound received by the sound means and the level of the sound received by the first sound receiving means, and performing level adjustment and phase adjustment, wherein the control means receives the sound by the second sound receiving means. Although a method of silencing a synthesized sound is described, it is technically not sufficient to actively mitigate directional noise in the entire three-dimensional space.
【０００７】また、本出願人の先願に係る空調室内機と
して、能動的に騒音を三次元空間内全体で消音するた
め、複数の発音手段を音源の近傍に設置したものがあ
る。これを図１４および図１５に示す。図１４は、その
空調室内機の斜視図であり、天井設置型のものである。
図示の如く、三次元空間全体に放射されるファンの羽根
音、電磁音等の低周波周期音を能動的消音によって低減
するため、騒音源であるターボファン６近傍に騒音検出
手段１（羽根音ピックアップ、電磁音ピックアップ）を
設置し、発音手段２ａ，２ｂおよび消音効果検出手段３
ａ，３ｂを騒音源であるターボファン６の周辺に設置し
てある。４はコントローラ、７はエアフィルター、８は
グリル、９は電気箱である。図１５は、図１４に示す空
調室内機の能動的消音のための一般的な制御構成を示
す。[0007] Further, as an air-conditioning indoor unit according to the prior application of the present applicant, there is an air-conditioning indoor unit in which a plurality of sound generating means are installed near a sound source in order to actively muffle noise in the entire three-dimensional space. This is shown in FIG. 14 and FIG. FIG. 14 is a perspective view of the air conditioner indoor unit, which is of a ceiling installation type.
As shown in the figure, in order to reduce low-frequency periodic sounds such as fan blade sound and electromagnetic sound radiated over the entire three-dimensional space by active noise reduction, noise detection means 1 (blade sound) is provided near a turbo fan 6 which is a noise source. Pickup, electromagnetic sound pickup), sound generating means 2a and 2b, and silencing effect detecting means 3
a and 3b are installed around the turbo fan 6 which is a noise source. 4 is a controller, 7 is an air filter, 8 is a grill, and 9 is an electric box. FIG. 15 shows a general control configuration for active silencing of the air conditioning indoor unit shown in FIG.
【０００８】しかし、図１４，図１５に示すものでは、
騒音源からの音が無指向性となる低周波数の音しか消音
できず、比較的高周波の音を三次元空間全体で消音する
ことは、指向性を有する騒音の消去を要することとなる
ため、困難である。However, in FIGS. 14 and 15,
Since only low-frequency sound from which the sound from the noise source becomes omnidirectional can be silenced, and silencing relatively high-frequency sound in the entire three-dimensional space requires elimination of directional noise, Have difficulty.
【０００９】また、一般に、能動的消音を適用した空気
調和室内機の場合、空気の流れが発音手段で邪魔される
などの問題が生じ易く、空気調和室内機の能力を低下さ
せないような発音手段の設置位置が問題になってくる。
さらに低コスト化、能動形消音装置に用いる各機器の有
効性を考慮した工夫も必要になる。In general, in the case of an air-conditioning indoor unit to which active noise reduction is applied, a problem that air flow is obstructed by the sounding unit is liable to occur, and the sounding unit does not lower the performance of the air-conditioning indoor unit. The location of installation becomes a problem.
Further, it is necessary to reduce the cost and to devise a device considering the effectiveness of each device used in the active silencer.
【００１０】[0010]
【発明が解決しようとする課題】本発明は、以上の諸問
題を考慮し、無指向性音となる低周波数の音から指向性
を有する高周波数の音までの広帯域騒音を能動的消音可
能とする三次元空間の能動消音装置の提供を目的とす
る。SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described problems, and has been made capable of actively silencing broadband noise from low-frequency sound, which is omnidirectional sound, to high-frequency sound having directivity. It is an object of the present invention to provide an active silencer in a three-dimensional space.
【００１１】[0011]
【課題を解決するための手段】上記目的を達成するため
に、本発明による三次元空間の能動消音装置は特許請求
の範囲の各請求項に記載の構成を有する。In order to achieve the above object, an active silencer in a three-dimensional space according to the present invention has the structure described in each of the claims.
【００１２】[0012]
【作用】本発明による三次元空間の能動消音装置によれ
ば、騒音と同様な指向性で且つ逆位相の音を放射できる
ようになる。そのため、低周波の騒音のみでなく高周波
の騒音も消音可能となる。また、三次元空間内の単数ま
たは複数の代表点で消音制御し、三次元空間内全体での
消音が可能となる。さらに、消音効果検出手段は音の干
渉によって生じる音圧の極小となる位置に設置すること
で、有効的な消音が三次元空間内で行われる。騒音検出
手段からの音波信号を信号処理回路で処理して、その２
倍、３倍、…ｎ倍成分の音波信号も生成した後、固定フ
ィルターまたは適応フィルターを経由することで、騒音
源からの騒音を正確に取り込むことが可能となる。According to the active silencer of the three-dimensional space according to the present invention, it is possible to radiate sound having the same directivity as that of noise and having the opposite phase. Therefore, not only low-frequency noise but also high-frequency noise can be silenced. In addition, silencing is performed at one or more representative points in the three-dimensional space, so that silencing can be performed in the entire three-dimensional space. Further, the silencing effect detecting means is installed at a position where the sound pressure generated by the interference of sound is minimized, so that effective silencing is performed in the three-dimensional space. The sound wave signal from the noise detecting means is processed by the signal processing circuit, and
After generating sound signals of the double, triple,..., N-fold components, the noise from the noise source can be accurately captured by passing through a fixed filter or an adaptive filter.
【００１３】空調機への適用の場合、複数個の発音手段
は、空気の流れを邪魔しない位置に置かれることによっ
て、空気調和機の性能を低下させることがなく、且つ、
ファンの回転音、モータの電磁音等の低周波数の騒音の
みでなく高周波数の騒音も三次元空間で消音できる。[0013] In the case of application to an air conditioner, the plurality of sound generating means are placed at positions where they do not obstruct the flow of air, so that the performance of the air conditioner is not reduced, and
Not only low-frequency noise such as fan rotation noise and motor electromagnetic noise, but also high-frequency noise can be eliminated in a three-dimensional space.
【００１４】[0014]
【実施例】図１は、本発明の１実施例による天井設置型
の空気調和室内機を模式的に示し、同図（ａ）はその斜
視図、（ｂ）は鉛直断面、（ｃ）はグリル平面図であ
る。図１４と同じ符号は同じものを示し、１５は熱変換
器である。図１４と異なる点は、もう１つの発音手段２
ｃ及びもう１つの消音効果検出手段３ｃが、エアーフィ
ルター７を有する吸い込みグリル８上に、ターボファン
６の中央となる位置に設定したことである。その結果、
本実施例の空調室内機では、図１４に示す空調室内機に
比べて各発音手段２ａ，２ｂ，２ｃ間距離が１／２に短
くなっているため、音の波長の関係から、図１４の場合
の２倍の周波数音までの広帯域能動消音制御が可能とな
る。1 schematically shows a ceiling-mounted type air conditioner indoor unit according to one embodiment of the present invention, wherein FIG. 1 (a) is a perspective view, FIG. 1 (b) is a vertical section, and FIG. It is a grill top view. 14 denote the same components, and 15 denotes a heat converter. 14 is different from FIG.
c and another muffling effect detecting means 3 c are set on the suction grill 8 having the air filter 7 at a position which is the center of the turbo fan 6. as a result,
In the air-conditioning indoor unit of the present embodiment, the distance between the sound generating means 2a, 2b, and 2c is reduced by half compared to the air-conditioning indoor unit shown in FIG. Broadband active silence control up to twice the frequency of the case is possible.
【００１５】図１において、３つの発音手段２ａ，２
ｂ，２ｃは、それら相互の間隔および騒音源たるターボ
ファン６からの間隔が消音したい騒音の周波数のうちの
最高周波数の音の波長の１／２より短い様に、騒音源た
るターボファン６を囲む位置に配置されている。In FIG. 1, three sound generating means 2a, 2
b and 2c denote the turbo fan 6 as the noise source so that the distance between them and the distance from the turbo fan 6 as the noise source are shorter than 波長 of the wavelength of the highest frequency sound of the noise frequencies to be silenced. It is arranged in the surrounding position.
【００１６】図２は、図１で示した空調室内機の能動消
音のための制御構成を示す。図１５の制御構成と異な
り、図２においては、消音効果検出手段３ａ，３ｂ，３
ｃとコントローラ（位相変換装置）４との間、および、
コントローラ４と発音手段２ａ，２ｂ，２ｃとの間に
は、夫々、固定フィルター５１および５２を入れてあ
る。これら固定フィルター５１，５２には、夫々、消音
効果検出手段３ａ，３ｂ，３ｃと三次元空間内で空調機
の騒音源たるターボファン６を囲む位置に設定した複数
の代表点との間の伝達関数、および、発音手段２ａ，２
ｂ，２ｃと三次元空間内の複数の代表点との間の伝達関
数の各実測値で決めたものを入れる。また、信号処理回
路とコントローラ４との間には、騒音検出手段１（ター
ボファンの羽根音および電磁音ピックアップ）と三次元
空間内の代表点との間の伝達関数の実測値で決めた固定
フィルター５３を入れてある。これによって、消音効果
検出手段３ａ，３ｂ，３ｃの位置だけで消音するのでは
なく、三次元空間内全体での消音が可能になる。FIG. 2 shows a control configuration for active silencing of the air-conditioning indoor unit shown in FIG. Unlike the control configuration of FIG. 15, in FIG. 2, the silencing effect detecting means 3a, 3b, 3
c and the controller (phase converter) 4, and
Fixed filters 51 and 52 are inserted between the controller 4 and the sound generators 2a, 2b and 2c, respectively. These fixed filters 51 and 52 respectively transmit transmission between the silencing effect detecting means 3a, 3b and 3c and a plurality of representative points set at positions surrounding the turbo fan 6 which is a noise source of the air conditioner in the three-dimensional space. Function and sounding means 2a, 2
A transfer function between b, 2c and a plurality of representative points in the three-dimensional space determined by each actually measured value is entered. Further, a fixed value determined by a measured value of a transfer function between the noise detecting means 1 (a blade sound of a turbo fan and an electromagnetic sound pickup) and a representative point in a three-dimensional space is provided between the signal processing circuit and the controller 4. Filter 53 is inserted. This makes it possible to mute not only the position of the muffling effect detecting means 3a, 3b, 3c, but also the entire three-dimensional space.
【００１７】図３は、天井設置型空調室内機から放射さ
れる騒音の指向性を断面図として例示したものである。
これに対し、図１に示した天井設置型空調室内機では、
図３で示す騒音の指向性に一致または類似する音を発音
手段２ａ，２ｂ，２ｃにより放射することが可能なの
で、指向性の生じる高周波数騒音の消音制御も可能とな
るのである。FIG. 3 is a cross-sectional view illustrating the directivity of noise radiated from a ceiling-mounted air-conditioning indoor unit.
In contrast, the ceiling-mounted air-conditioning indoor unit shown in FIG.
Since a sound that matches or is similar to the directivity of the noise shown in FIG. 3 can be emitted by the sounding means 2a, 2b, and 2c, the silencing control of high-frequency noise that causes directivity can also be performed.
【００１８】図４は、天井設置型空調室内機の空気の流
れを示した断面図および下面図であり、エアーフィルタ
ー７を有する吸い込みグリル８においてターボファン６
の中央となる位置に流れる空気の量は少ない。それ故
に、前記実施例のように、ファン６の中央となる位置に
発音手段２ｃを設定しても空気の流れを邪魔しない。FIG. 4 is a sectional view and a bottom view showing the flow of air in the ceiling-installed air-conditioning indoor unit.
The amount of air flowing to the center position of is small. Therefore, even if the sound generator 2c is set at the center position of the fan 6 as in the above-described embodiment, the air flow is not obstructed.
【００１９】図１で示す空調室内機においては、騒音検
出手段１として、ターボファン６の回転音（羽根音）検
出用ピックアップとファン６を回転するためのモータの
電磁音検出用ピックアップを設けている。また、コント
ローラ（位相変換装置）４は、電気箱９と同様に、メン
テナンスが容易な位置に設定してある。さらに消音効果
検出手段３ａ，３ｂ，３ｃとしてはコンデンサマイクロ
ホンを使用しており、このため、安価であり、かつ、三
次元空間内の代表点との間の伝達関数を、これらのコン
デンサマイクロホンへ逆に電気信号を入力することで、
容易に実測できる。In the air conditioner indoor unit shown in FIG. 1, a pickup for detecting the rotation sound (blade sound) of the turbo fan 6 and a pickup for detecting the electromagnetic sound of the motor for rotating the fan 6 are provided as the noise detection means 1. I have. The controller (phase conversion device) 4 is set at a position where maintenance is easy, similarly to the electric box 9. Further, condenser microphones are used as the noise reduction effect detecting means 3a, 3b, 3c. Therefore, the transfer function between the microphone and the representative point in the three-dimensional space is inexpensive. By inputting electrical signals to
It can be easily measured.
【００２０】図５は、図２で示した制御構成の代りに使
用できる他の制御構成を示し、図２と異なる点は、固定
フィルター５１，５２，５３が随時適切に変化する適応
フィルター６１，６２，６３となっていることである。
図５の破線内の各手段は全て、相互に干渉しながら随時
決まる。これら適応フィルター６１，６２，６３は，夫
々、消音効果検出手段３ａ，３ｂ，３ｃとコントローラ
（位相変換装置）４との間、発音手段２ａ，２ｂ，２ｃ
とコントローラ４との間、および、騒音検出手段１とコ
ントローラ４との間に、設定されている。これらの適応
フィルターはそれぞれ常に変化し、夫々、消音効果検出
手段３ａ，３ｂ，３ｃと三次元空間内の代表点との間の
伝達関数、発音手段２ａ，２ｂ，２ｃと三次元空間内代
表点との間の伝達関数、および、騒音検出手段１と三次
元空間内の代表点との間の伝達関数に相当するものとし
て決まる。これによって、消音効果検出手段３ａ，３
ｂ，３ｃの位置だけを消音するのではなく、三次元空間
内全体での消音が可能となる。また、これらの適応フィ
ルターのうちの幾つかを固定フィルターとし、適応フィ
ルターと固定フィルターを混合させた制御構成とするこ
ともできる。FIG. 5 shows another control configuration which can be used in place of the control configuration shown in FIG. 2. The difference from FIG. 2 is that the fixed filters 51, 52 and 53 change adaptive filters 61 and 52, which change appropriately as needed. 62 and 63.
All means within the broken line in FIG. 5 are determined at any time while interfering with each other. These adaptive filters 61, 62, 63 are respectively provided between the muffling effect detecting means 3a, 3b, 3c and the controller (phase converter) 4, the sound generating means 2a, 2b, 2c.
And the controller 4, and between the noise detection means 1 and the controller 4. These adaptive filters are constantly changing, respectively, and the transfer function between the silencing effect detecting means 3a, 3b, 3c and the representative point in the three-dimensional space, the sound generating means 2a, 2b, 2c and the representative point in the three-dimensional space, respectively. And a transfer function between the noise detection means 1 and a representative point in the three-dimensional space. As a result, the muffling effect detecting means 3a, 3
It is possible to mute not only the positions of b and 3c but also the entire three-dimensional space. Some of these adaptive filters may be fixed filters, and a control configuration in which the adaptive filters and the fixed filters are mixed may be employed.
【００２１】図２，図５に示す制御構成において、信号
処理回路では、羽根音ピックアップ、電磁音ピックアッ
プの出力信号の２次〜ｎ次成分の信号もそれぞれ生成
し、ゲイン調整した後これらを混ぜ合わせた信号にして
出力する。In the control configuration shown in FIGS. 2 and 5, the signal processing circuit also generates signals of the secondary to n-order components of the output signals of the blade sound pickup and the electromagnetic sound pickup, adjusts the gain, and mixes them. Output as a combined signal.
【００２２】複数個の消音効果検出手段３ａ，３ｂ，３
ｃの位置は、三次元空間において消音効果が最も大きく
なるような位置、すなわち騒音源からの音と前記発音手
段２ａ，２ｂ，２ｃからの音との干渉によって生じる音
圧が極小となる位置（通常、騒音源の中心と各発音手段
との間の真中の位置）に設置してある。そして、前記の
固定フィルターまたは適応フィルターを経由することで
信号の補正をし、騒音消去用としての適切な信号に一致
または類似させている。A plurality of muffling effect detecting means 3a, 3b, 3
The position of c is a position at which the sound deadening effect is maximized in the three-dimensional space, that is, a position at which the sound pressure generated by the interference between the sound from the noise source and the sound from the sounding means 2a, 2b, 2c is minimized ( Usually, it is installed at the middle position between the center of the noise source and each sound generating means). The signal is corrected by passing through the above-mentioned fixed filter or adaptive filter, so that the signal is matched or similar to an appropriate signal for noise cancellation.
【００２３】図６の（ａ），（ｂ），（ｃ）は、複数個
の発音手段２を天井設置型空調室内機の吸い込みグリル
８上に設定した他の実施例のグリル平面図であって、ど
の発音手段２も、図１の実施例と同様に、空気の流れを
邪魔しない位置に設定してある。なお図６の各図におい
ては、各発音手段は２ａ，２ｂ，…等の如く各別の符号
でなくて単に符号２で示した。各発音手段２の大きさ、
位置は、消音制御したい音の対象周波数、スペースの都
合等に合わせ、各々異なったものとすることができる。
これらの発音手段２は、図１の場合と同様、それらの相
互の間隔および騒音源たるターボファン６からの間隔が
消音したい騒音の最高周波の音の波長の１／２より短い
様に、騒音源たるターボファンを囲む位置に配置され
る。FIGS. 6 (a), 6 (b) and 6 (c) are plan views of a grill according to another embodiment in which a plurality of sound generators 2 are set on a suction grill 8 of a ceiling-mounted air-conditioning indoor unit. Each of the sound generating means 2 is set at a position which does not obstruct the flow of air, as in the embodiment of FIG. In addition, in each drawing of FIG. 6, each sound generating means is simply indicated by reference numeral 2 instead of different reference numerals such as 2a, 2b,. The size of each sounding means 2,
The positions can be different from each other in accordance with the target frequency of the sound to be silenced, the space, and the like.
As in the case of FIG. 1, these sounding means 2 are arranged so that their mutual interval and the interval from the turbo fan 6 which is a noise source are shorter than 1/2 of the wavelength of the highest frequency sound of the noise to be silenced. It is arranged at a position surrounding the turbo fan that is the source.
【００２４】図７は、本発明を適用した別の形の空調室
内機の斜視図を示し、図８は、この空調室内機の断面図
を示す。騒音検出手段１として、ケーシング１６を含む
シロッコファン１０の回転音検出用ピックアップ１ａと
該ファン１０を回転するためのモータ１１の電磁音検出
用ピックアップ１ｂが設置され、また複数個の発音手段
２ａ〜２ｇ、複数個の消音効果検出手段３が設置されて
いる。これらの複数個の発音手段は、異なる大きさのも
のを、それぞれ、制御したい音の対象周波数、スペース
の都合等に合わせ、図８で示す如く、空調室内機内の各
機器間の隙間、例えば、ケーシング１６を含むシロッコ
ファン１０とモータ１１の間などに設定してある。ま
た、発音手段２ｇの様に、シロッコファン１０やモータ
１１などの騒音源から離れた位置に発音手段を設定した
場合には、伝音チューブ１２を用いることで当該発音手
段からの音を所要位置にて放射するようにしている。１
５は熱交換器である。消音効果検出手段３は、エアーフ
ィルター７を有する吸い込みグリル８上の適当な位置に
設置してあり、これらにはコンデンサマイクロホンを用
いて低コスト化や便宜性を図っている。コントローラ
（位相変換装置）４は、電気箱９の位置と同様に、メン
テナンスの容易な位置に設定してある。これらの発音手
段２ａ〜２ｇ（２ｇでは伝音チューブ１２の先端部）
は、それらの相互の間隔および騒音源たるシロッコファ
ンやモータからの間隔が消音したい騒音の最高周波数の
音の波長の１／２より短い様に、且つ空気の流れを邪魔
しない位置で、騒音源を囲む位置に配置されている。制
御構成は、図２または図５に示すものと同じである。FIG. 7 is a perspective view of another type of air-conditioning indoor unit to which the present invention is applied, and FIG. 8 is a sectional view of the air-conditioning indoor unit. As the noise detecting means 1, a pickup 1a for detecting the rotation sound of the sirocco fan 10 including the casing 16 and a pickup 1b for detecting the electromagnetic sound of the motor 11 for rotating the fan 10 are provided. 2g, a plurality of muffling effect detecting means 3 are provided. As shown in FIG. 8, the plurality of sounding means may have different sizes according to the target frequency of the sound to be controlled, the space, and the like, as shown in FIG. It is set between the sirocco fan 10 including the casing 16 and the motor 11. When the sound generating means is set at a position distant from a noise source such as the sirocco fan 10 or the motor 11 like the sound generating means 2g, the sound from the sound generating means is transmitted to the required position by using the sound transmission tube 12. To radiate. 1
5 is a heat exchanger. The silencing effect detecting means 3 is installed at an appropriate position on the suction grill 8 having the air filter 7, and a condenser microphone is used for these to reduce cost and convenience. The controller (phase conversion device) 4 is set at a position where maintenance is easy, similarly to the position of the electric box 9. These sounding means 2a to 2g (the tip of the sound transmission tube 12 in 2g)
The noise source should be positioned so that their distance from each other and the distance from the sirocco fan or motor, which is the noise source, is shorter than half the wavelength of the sound of the highest frequency of the noise to be silenced, and at a position where the air flow is not obstructed. It is arranged at the position surrounding. The control configuration is the same as that shown in FIG. 2 or FIG.
【００２５】図９は本発明を適用した更に別の形の空気
調和室内機の斜視図を示し、図１０は該空気調和室内機
の断面図を示す。騒音検出手段１として、貫流ファン１
３の回転音検出ピックアップ１ａと該ファンのモータ１
１の電磁音検出用ピックアップ１ｂが設けてあり、また
複数個の発音手段２ｈ，２ｉ、複数個の消音効果検出手
段３が設けてある。複数個の発音手段２ｈ，２ｉは、図
に示す位置に横列に並べて設置してあり、空気の流れを
邪魔しない。また、空気の吹き出し口における風速、風
圧の検出ピックアップ１４を設け、この出力信号を処理
することにより、吹き出し口からの騒音を予測し、発音
手段２ｉからの音で消音可能としている。消音効果検出
手段３は、エアーフィルター７を有する吸い込みグリル
８の適当な位置に設置してあり、これもコンデンサマイ
クロホンを用いて低コスト化や便宜性を図っている。さ
らに、図１０には直接示していないが、コントローラ
（位相変換装置）４も、電気箱９と同様に、メンテナン
スの容易な位置に設定してある。制御構成は、図２また
は図５に示すものと同じである。FIG. 9 is a perspective view of still another type of air-conditioning indoor unit to which the present invention is applied, and FIG. 10 is a sectional view of the air-conditioning indoor unit. Once-through fan 1 as noise detection means 1
3 rotation sound detection pickup 1a and motor 1 of the fan
One electromagnetic sound detection pickup 1b is provided, and a plurality of sound generating means 2h and 2i, and a plurality of muffling effect detecting means 3 are provided. The plurality of sounding means 2h and 2i are arranged in rows at the positions shown in the figure, and do not obstruct the flow of air. Further, a pickup 14 for detecting the wind speed and pressure at the air outlet is provided, and by processing this output signal, the noise from the outlet is predicted, and the sound from the sound generator 2i can be silenced. The muffling effect detecting means 3 is installed at an appropriate position of the suction grille 8 having the air filter 7, which also uses a condenser microphone for cost reduction and convenience. Further, although not shown directly in FIG. 10, the controller (phase conversion device) 4 is set at a position where maintenance is easy, similarly to the electric box 9. The control configuration is the same as that shown in FIG. 2 or FIG.
【００２６】本発明は、以上述べた実施例に限らず、他
の形の空調室内機においても実施可能である。更に空調
機に限らず、一般に三次元空間における能動消音に適用
可能である。The present invention is not limited to the embodiment described above, but can be implemented in other types of air-conditioning indoor units. Further, the present invention is not limited to an air conditioner, and is generally applicable to active noise reduction in a three-dimensional space.
【００２７】なお、図１１に示すように、発音手段２か
ら、バックグラウンド音楽やメッセージ、又は、冷房時
には涼しく暖房時には暖かい感じのする音も出力可能と
するように、これらの音の信号を出力する信号出力手段
１７を設け、これをミキサーを経由して発音手段２に与
えることもできる。As shown in FIG. 11, a signal of these sounds is output from the sound generating means 2 so that background music and messages, or sounds that feel cool when cooling and warm when heating can be output. It is also possible to provide a signal output means 17 for outputting sound to the sound generating means 2 via a mixer.
【００２８】[0028]
【発明の効果】以上説明したように、本発明によれば、
従来技術による騒音の能動制御に対して、複数個の発音
手段を消音したい音の波長の１／２よりも短い間隔で騒
音源の周りにそれを囲むように設置し、各々別々のフィ
ルターを経由させる構成としているため、低周波音〜高
周波音の広帯域の騒音の消音制御が可能となる。さら
に、音を伝搬可能な伝音チューブを使用すれば、発音手
段を騒音源からかなり離した位置にも設置できる。さら
に、空調機の場合には、空気の流れを邪魔しない様にし
て、空調機の性能を低下させない様に、能動制御に必要
な発音手段等の各手段および装置を、吸い込みグリル上
や空調機内各機器の隙間等に設置することができ、空調
機内へのその配置上の制約が少ない。As described above, according to the present invention,
For the active control of noise according to the prior art, a plurality of sounding means are installed around the noise source at intervals shorter than half the wavelength of the sound to be silenced, and each of them is passed through a separate filter. With such a configuration, it is possible to perform silencing control of a wide band of noise from low-frequency sound to high-frequency sound. Furthermore, if a sound transmission tube capable of transmitting sound is used, the sound generating means can be installed at a position far away from the noise source. Furthermore, in the case of an air conditioner, each means and device such as a sound generating means necessary for active control is provided on the suction grill or inside the air conditioner so as not to obstruct the flow of air and to reduce the performance of the air conditioner. It can be installed in gaps between devices and the like, and there are few restrictions on its arrangement in the air conditioner.
【図１】本発明の１実施例による天井設置型の空調室内
機の斜視図（ａ）、断面図（ｂ）および吹出グリル平面
図（ｃ）、FIG. 1 is a perspective view (a), a sectional view (b), and a blowout grill plan view (c) of a ceiling-mounted air-conditioning indoor unit according to one embodiment of the present invention;
【図２】同上の実施例における能動消音のための制御構
成を示す図、FIG. 2 is a diagram showing a control configuration for active silencing in the above embodiment;
【図３】天井設置型空調室内機の騒音の指向性の例示
図、FIG. 3 is a diagram showing an example of directivity of noise of a ceiling-installed air-conditioning indoor unit,
【図４】天井設置型空調室内機の空気の流れを示す断面
図（ａ）および下面図（ｂ）、FIG. 4 is a sectional view (a) and a bottom view (b) showing the flow of air in a ceiling-mounted air-conditioning indoor unit;
【図５】上記実施例における能動消音のための制御構成
の他の例を示す図、FIG. 5 is a diagram showing another example of a control configuration for active noise reduction in the embodiment.
【図６】本発明における複数の発音手段の幾つかの配置
例（ａ），（ｂ），（ｃ）を示すグリル平面図、FIG. 6 is a plan view of a grill showing some arrangement examples (a), (b), and (c) of a plurality of sound generating means in the present invention;
【図７】本発明の他の実施例の空調室内機の斜視図、FIG. 7 is a perspective view of an air-conditioning indoor unit according to another embodiment of the present invention;
【図８】図７の実施例の内部を示す平面図、FIG. 8 is a plan view showing the inside of the embodiment of FIG. 7,
【図９】本発明の更に他の実施例の空調室内機の斜視
図、FIG. 9 is a perspective view of an air conditioner indoor unit according to still another embodiment of the present invention;
【図１０】図９の実施例の内部を示す断面図、FIG. 10 is a sectional view showing the inside of the embodiment of FIG. 9;
【図１１】発音手段からバックグラウンド音楽等を流す
ための回路の例示図、FIG. 11 is an exemplary diagram of a circuit for playing background music or the like from a sounding means,
【図１２】従来のダクト内一次元音波の能動消音の例を
示す図、FIG. 12 is a diagram showing an example of conventional active silencing of one-dimensional sound waves in a duct;
【図１３】図１２に用いる固定フィルターを示す図、FIG. 13 is a diagram showing a fixed filter used in FIG.
【図１４】三次元消音をする空調室内機の先行例の斜視
図、FIG. 14 is a perspective view of a prior example of an air-conditioning indoor unit that performs three-dimensional noise reduction.
【図１５】図１４の空調室内機における能動消音のため
の制御構成を示す図。FIG. 15 is a diagram showing a control configuration for active noise reduction in the air-conditioning indoor unit of FIG. 14;
１…騒音検出手段 ２…発音手段 ３…消音効果検出手段 ４…コントローラ
（位相変換装置） ６…ターボファン ７…エアーフィル
ター ８…空調室内機のグリル ９…電気箱 １０…シロッコファン １１…ファンモー
タ １２…伝音チューブ １３…貫流ファン １４…風速、風圧のピックアップ １５…熱交換器 １６…ケーシングDESCRIPTION OF SYMBOLS 1 ... Noise detection means 2 ... Sound generation means 3 ... Noise reduction effect detection means 4 ... Controller (phase conversion device) 6 ... Turbo fan 7 ... Air filter 8 ... Grill of an air-conditioning indoor unit 9 ... Electric box 10 ... Sirocco fan 11 ... Fan motor 12 ... sound transmission tube 13 ... cross-flow fan 14 ... pickup of wind speed and wind pressure 15 ... heat exchanger 16 ... casing
───────────────────────────────────────────────────── フロントページの続き (72)発明者 花田正道 静岡県清水市村松390番地 株式会社日 立製作所清水工場内 (72)発明者 千秋隆雄 静岡県清水市村松390番地 株式会社日 立製作所清水工場内 (58)調査した分野(Int.Cl.7，ＤＢ名) F24F 13/06 G10K 11/16 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masamichi Hanada 390 Muramatsu, Shimizu-shi, Shizuoka Pref. Inside Shimizu Plant, Hitachi Ltd. (72) Inventor Takao Chiaki 390 Muramatsu, Shimizu-shi, Shizuoka Shimizu Plant, Inc. (58) Fields surveyed (Int.Cl. 7 , DB name) F24F 13/06 G10K 11/16
Claims (4)
出手段、能動消音用制御装置、上記騒音源との間隔およ
び相互間の間隔が消音したい前記騒音の最高周波数の音
の波長の１／２より短く且つ前記騒音源を囲む位置に配
置された複数の発音手段ならびに消音効果検出手段を具
備し、前記能動消音用制御装置は、前記騒音検出手段お
よび消音効果検出手段の出力信号に基づいて、前記騒音
源から三次元空間に放射される広周波数域の騒音と逆位
相で同じ音圧、波長および指向性を持つ音波を前記発音
手段から放射する様に構成したことを特徴とする、三次
元空間の能動消音装置。1. A noise detecting means for detecting noise emitted from a noise source, a control device for active noise reduction, and a distance between the noise source and a distance between the noise sources is の of the wavelength of the highest frequency sound of the noise to be muffled. A plurality of sounding means and a muffling effect detecting means which are shorter and are arranged at a position surrounding the noise source, wherein the active muffling control device is based on output signals of the noise detecting means and the muffling effect detecting means, A sound source having the same sound pressure, wavelength and directivity in opposite phase to the noise in a wide frequency range radiated from the noise source into a three-dimensional space, and radiating sound waves from the sounding means, Active silencer in space.
発音手段からの音を伝える伝音チューブを有し、該伝音
チューブの音放射位置が前記に規定した位置を満足する
請求項１記載の、三次元空間の能動消音装置。2. The apparatus according to claim 1, wherein at least one of said plurality of sounding means has a sound transmission tube for transmitting sound from said sounding means, and a sound emission position of said sound transmission tube satisfies the position defined above. An active silencer in a three-dimensional space as described.
よび前記複数の消音効果検出手段と制御装置との間に
は、夫々、これら発音手段と三次元空間内の代表点との
間の伝達関数およびこれら消音効果検出手段と三次元空
間内の代表点との間の伝達関数の実測値で定めた固定フ
ィルターが挿入されていることを特徴とする請求項１又
は２記載の、三次元空間の能動消音装置。3. Between the plurality of sounding means and the control device and between the plurality of muffling effect detecting means and the control device, respectively, between the sounding means and a representative point in a three-dimensional space. The three-dimensional filter according to claim 1 or 2, wherein a fixed filter determined by a transfer function and a measured value of the transfer function between these muffling effect detecting means and a representative point in the three-dimensional space is inserted. Active silencer in space.
は、該騒音検出手段と三次元空間内の代表点との間の伝
達関数の実測値で定められた固定フィルターが挿入され
ている請求項１，２又は３記載の、三次元空間の能動消
音装置。4. A fixed filter, which is determined by an actual measured value of a transfer function between the noise detecting means and a representative point in a three-dimensional space, is inserted between the noise detecting means and the control device. The active silencer in a three-dimensional space according to claim 1, 2, or 3.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4032029A JP3072174B2 (en) | 1992-02-19 | 1992-02-19 | Active silencer in three-dimensional space |
| EP93301150A EP0557071B1 (en) | 1992-02-19 | 1993-02-17 | Active noise control apparatus for three-dimensional space |
| US08/019,708 US5343713A (en) | 1992-02-19 | 1993-02-19 | Active noise control apparatus for three-dimensional space |
| CN93101772A CN1040375C (en) | 1992-02-19 | 1993-02-19 | Dynamic noise contro/equipment for three-dimensional space |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4032029A JP3072174B2 (en) | 1992-02-19 | 1992-02-19 | Active silencer in three-dimensional space |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05231706A JPH05231706A (en) | 1993-09-07 |
| JP3072174B2 true JP3072174B2 (en) | 2000-07-31 |
Family
ID=12347444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4032029A Expired - Fee Related JP3072174B2 (en) | 1992-02-19 | 1992-02-19 | Active silencer in three-dimensional space |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3072174B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9076424B2 (en) | 2011-04-06 | 2015-07-07 | Panasonic Intellectual Property Management Co., Ltd. | Active noise control device |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH095154A (en) * | 1995-06-22 | 1997-01-10 | Nkk Corp | Adaptive type directional sound detector |
| JP2001075576A (en) * | 1999-06-29 | 2001-03-23 | Toshiba Corp | Three-dimensional active muffling device |
| US6901147B1 (en) | 1999-06-29 | 2005-05-31 | Kabushiki Kaisha Toshiba | Three-dimension active silencer |
| JP2011137560A (en) * | 2009-12-25 | 2011-07-14 | Mitsubishi Electric Corp | Air conditioner |
| CN102985761B (en) * | 2010-06-29 | 2015-04-22 | 三菱电机株式会社 | Air conditioner |
| WO2012017575A1 (en) * | 2010-08-04 | 2012-02-09 | 三菱電機株式会社 | Air conditioner |
| JP6214579B2 (en) * | 2015-01-23 | 2017-10-18 | 三菱電機株式会社 | Sound emission device for consciousness control |
| CN113375299A (en) * | 2020-02-25 | 2021-09-10 | 青岛海尔空调器有限总公司 | Control method for equipment running frequency and air conditioner controller |
-
1992
- 1992-02-19 JP JP4032029A patent/JP3072174B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9076424B2 (en) | 2011-04-06 | 2015-07-07 | Panasonic Intellectual Property Management Co., Ltd. | Active noise control device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05231706A (en) | 1993-09-07 |
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