WO2015107605A1 - Active sound wave control system - Google Patents

Active sound wave control system Download PDF

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Publication number
WO2015107605A1
WO2015107605A1 PCT/JP2014/006320 JP2014006320W WO2015107605A1 WO 2015107605 A1 WO2015107605 A1 WO 2015107605A1 JP 2014006320 W JP2014006320 W JP 2014006320W WO 2015107605 A1 WO2015107605 A1 WO 2015107605A1
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WIPO (PCT)
Prior art keywords
sound wave
control system
wave control
frequency
door
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PCT/JP2014/006320
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French (fr)
Japanese (ja)
Inventor
宮川　昭夫
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有限会社幸昭
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Publication of WO2015107605A1 publication Critical patent/WO2015107605A1/en

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
    • G10K11/17823—Reference signals, e.g. ambient acoustic environment
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17873—General system configurations using a reference signal without an error signal, e.g. pure feedforward
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/12—Rooms, e.g. ANC inside a room, office, concert hall or automobile cabin
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3212—Actuator details, e.g. composition or microstructure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones

Definitions

  • the present invention relates to an active sound wave control system that can adjust sound waves in a room.
  • Patent Document 1 Although it is easy to leak out from a door, as described in Patent Document 1, a specially designed material with a large mass and a thickness is provided to provide a soundproofing effect, and the door frame side is made of rubber. The seal packing was attached so that there was no gap when the door was closed.
  • the present invention has been made by paying attention to the above-mentioned conventional problems, and is a new and useful active sound wave control system that can be easily retrofitted into an existing room and can respond to acoustic adjustment and soundproofing requirements. Its purpose is to provide.
  • the present invention has been made to solve the above problems, and the invention of claim 1 is directed to a microphone, an antiphase converter that converts sound waves collected by the microphone into an antiphase, and the antiphase converter. And a vibrator that outputs the sound wave converted into the opposite phase as vibration and a vibration body that outputs the vibration received from the vibrator as sound wave, and superimposes the sound wave emitted from the vibrator on the sound wave to be removed.
  • the active sound wave control system is characterized by actively removing the sound wave by combining them.
  • the invention of claim 2 is the active sound wave control system according to claim 1, wherein the vibrating body is constituted by a single structure such as a panel, a door or the like.
  • the active sound wave control system includes a frequency selection unit that selects a frequency to be removed from the frequencies of the sound waves collected by the microphone, It is an active sound wave control system characterized by converting a sound wave of a specified frequency into an antiphase.
  • the frequency selecting unit analyzes the frequency of the sound wave collected by the microphone, and the frequency to be removed from the analyzed frequencies.
  • An active sound wave control system comprising a frequency sorting unit for sorting.
  • the invention of claim 5 is the active sound wave control system according to claim 3, wherein the frequency selection unit includes an operation unit for receiving a selection request.
  • the active sound wave control system of the present invention it is an object of the present invention to provide a new and useful active sound wave control system which can be easily attached later in an existing room and which can meet the demands of sound adjustment and sound insulation. To do.
  • FIG. 2 is an electrical block diagram of FIG. 1. It is explanatory drawing of the installation state of the 1st example of the active sound wave control system of FIG.
  • FIG. 3 is a partially modified electrical block diagram of FIG. 2. It is explanatory drawing of the installation state of the 2nd example of the active sound wave control system of FIG.
  • FIG. 5 is a partially modified electrical block diagram of FIG. 4.
  • the active sound wave control system 1 includes a microphone 3, a controller 5, a vibrator 7, and a vibrating body 9, and the microphone 3 and the vibrator 7 are connected to the controller 5 with a cable 11. It is electrically connected via.
  • a vibrator 9 is attached to the vibrator 7 in a contact state and is in a vibration connection state.
  • the vibrating body 9 has a single structure and is formed in a thin plate shape, and the vibrator 7 is fixed to the center of one of the plate surfaces.
  • the vibrating body 9 can be replaced by a flat door (D), a panel (P), or the like.
  • a cable 11 to which a power plug 13 is attached is also connected to the controller 5, and when the power plug 13 is plugged into an outlet, commercial power is supplied to the system system and is activated.
  • various processing units are accommodated in the housing 15 of the controller 5.
  • the sound waves collected by the microphone 3 are output as analog signals and input to the frequency anti-phase conversion unit 17.
  • an inverted signal whose phase is inverted is output and input to an amplifier (amplifier) 19.
  • amplifier (amplifier) 19 is amplified by this amplifier (amplifier) 19 and sent to the vibrator 7.
  • the amplifier (amplifier) 19 is provided with an adjustment volume (not shown).
  • the emitted sound wave is obtained by reversing the phase of the sound wave collected by the microphone 3. Further, the amplification is adjusted, and the sound wave is emitted from the vibrating body 9 with the same amplitude as the sound wave collected by the microphone 3.
  • FIG. 3 shows an example of the installation.
  • the microphone 3 is attached to the vicinity of the upper side of the door (D) frame so that the sound collection side faces the center of the room, and the controller 5 is fixed to the wall surface in the vicinity thereof.
  • the vibrator 7 is fixed to the center part of the plate surface facing the room side of the door (D). Since the vibrator 7 is fixed via an adhesive means (not shown) such as a double-sided tape, it is easy to remove.
  • an adhesive means not shown
  • the controller 5 can also be constituted by an analog circuit.
  • the active sound wave control system 1 of FIG. 1 can also be configured to select a specific frequency and cancel the sound wave of that frequency.
  • FIG. 4 is a partial modification of the electrical block diagram of FIG. 2, and the internal configuration of the controller 5 is different.
  • the sound wave collected by the microphone 3 is output as an analog signal, then converted into a digital signal by the A / D converter 21 and input to the frequency analyzer 23.
  • the frequency analysis unit 23 performs frequency analysis by a well-known FFT (Fast Fourier Transform) and converts it to the frequency domain. Therefore, a frequency having a long reverberation time can be captured at a position on the frequency axis.
  • FFT Fast Fourier Transform
  • the frequency selection unit 25 automatically selects and outputs a frequency component having a long reverberation time among frequency components after frequency analysis. This frequency component is converted into an analog signal by the D / A converter 27 and input to the frequency anti-phase converter 17.
  • a computer such as a microprocessor or a digital processor is used to implement the frequency analysis unit 23 and the frequency selection unit 25, and the operation is performed when the built-in CPU executes the processing procedure stored in the built-in ROM. It is controlled.
  • the active sound wave control system 1 can change the controller 5 as described above, and can be used for adjusting the acoustic environment of the room by utilizing the feature that the frequency can be selected.
  • FIG. 5 shows an example of the installation.
  • the microphone 3 is attached to the upper side of the side wall so that the sound collecting side faces the center of the room, and the controller 5 is fixed to the wall surface in the vicinity thereof.
  • a square panel (P) is fixed to the three side walls (S) and the ceiling (T) of the room.
  • the vibrator 7 is detachably fixed to the center part of each panel (P).
  • the door (D) shown in FIG. 3 is provided in the remaining side wall (S) side, the vibrator 7 is fixed to the door (D) similarly to FIG.
  • the cable 11 is not shown for the convenience of visual recognition.
  • the power plug 13 is inserted into the outlet (C) to start the system.
  • the microphone 3 collects the sound waves emitted from the sound source such as the piano (A)
  • the sound waves having a long reverberation time that cause reverberation are selected as “sounds to be removed” from the sound waves, and the panel (P ) And the door (D), and the sound wave for silencing with the same amplitude is emitted in the opposite phase, the acoustic environment in the room is actively improved.
  • FIG. 6 is a partial modification of FIG. 4, and a plurality of frequency selection buttons 29 are provided as an operation unit.
  • the selection button 29 constitutes a switch of a switch circuit, and when the selection button 29 is pressed, the frequency selection unit 25 selects and outputs the corresponding frequency. Therefore, it is possible to select “sounds to be removed” according to the intention of a person, and it is possible to easily create a sound field dedicated to oneself. Since the reverberation varies from low to high, depending on the pitch, it is said that the frequency characteristics are good at almost the same reverberation length at any height, but it is useful when you want to actively create reverberation. It is.
  • the vibrating body may be anything that can vibrate indoors.
  • a panel attached to the side wall is used as a vibrating body so as not to get in the way, or a door is used to change the door for soundproofing.
  • it itself is used as a vibrating body, it is not limited to those shapes, and since it may be a three-dimensional shape with unevenness, ceramics such as engravings and hollow vases can be substituted.
  • the active sound wave control system of the present invention it is easy to construct and can be constructed very compactly. Therefore, it can be easily adopted in a room or factory where it is desired to shut out noise from the indoor environment. Furthermore, if a vibrating body is installed in the main body of the ship, the sound can be reduced when the engine sound peculiar to the ship is propagating solidly to the hull.

Abstract

Special construction work is required to adjust the acoustics in a music studio because sound absorbing materials need to be selected and installed with detailed consideration, thus increasing costs. Furthermore, a soundproof door would result in inconveniences such as difficulty opening and closing the door due to increased heaviness. An active sound wave control system according to the present invention comprises: a microphone (3); a controller (5) including a reverse phase converter for converting the phase of sound waves collected using the microphone (3) into the reverse phase; an exciter (7) for outputting the sound waves converted into the reverse phase using the reverse phase converter as vibrations; and an oscillating body (9) for outputting the vibrations received from the exciter (7) as sound waves. The active sound wave control system actively removes sound waves by superimposing the sound waves generated by the oscillating body (9) on the sound waves to be removed. If the oscillating body (9) is used on a door (D), a soundproof door can be created from an existing door. Further, if the oscillating body is configured to remove sound waves having a selected frequency, the oscillating body (9) can be used to adjust the acoustics in a room.

Description

アクティブ音波コントロールシステムActive sound wave control system
　本発明は、室内の音波を調整することができるアクティブ音波コントロールシステムに関するものである。 The present invention relates to an active sound wave control system that can adjust sound waves in a room.
　既存の音楽スタジオ等の防音室では、空気を密閉できる構造にすることで外への音漏れを防止しており、その密閉構造を効率良く作るために、室内を狭くしたり、正方形や長方形の部屋にしたりしているために、どうしても残響が大きくなっている。
　従って、室内での不都合な残響の発生を防ぐために、音源の設置位置を調整したり、グラスウール、ロックウール等を板状に加工して壁材としたり、ポリエステル繊維等をシート状にして壁に貼り合わせたり、織ってカーテンとして窓に掛けたり等の工夫をして吸音させることで対応していた。 In soundproof rooms such as existing music studios, sound leakage to the outside is prevented by adopting a structure that can seal the air. To make the sealed structure efficient, the room is narrowed, square or rectangular The reverberation is inevitably large because it is a room.
Therefore, in order to prevent the occurrence of inconvenient reverberation in the room, the installation position of the sound source is adjusted, glass wool, rock wool etc. are processed into a plate shape to make a wall material, polyester fiber etc. is made into a sheet shape on the wall It was possible to absorb the sound by adhering or weaving it and hanging it on the window as a curtain.
　また、ドアから外に漏れやすいが、特許文献１に記載のように、質量の大きい材料で厚みを持たせたものに特別に設計して防音効果を持たせ、さらに、ドア枠側にゴム製のシールパッキンを取り付けて、ドアを閉じたときには隙間ができないようにしていた。 Moreover, although it is easy to leak out from a door, as described in Patent Document 1, a specially designed material with a large mass and a thickness is provided to provide a soundproofing effect, and the door frame side is made of rubber. The seal packing was attached so that there was no gap when the door was closed.
特開２００２－８９１４２号公報JP 2002-89142 A
　しかしながら、吸音に関しては、「良い音を吸収」して「悪い音を反射」すれば音響環境に却って悪影響をもたらすので、吸音波材を選択したり、その配置を細かく考慮したりしなければならないため、特別な施工が必要となり、コスト高になっている。
　また、防音ドアに関しても、ドアが重くなり開閉し難くなる等の不便が生じている。 However, regarding sound absorption, “absorbing good sound” and “reflecting bad sound” adversely affects the acoustic environment. Therefore, it is necessary to select a sound absorbing material and carefully consider its arrangement. Therefore, special construction is required and the cost is high.
In addition, the soundproof door also has inconveniences such as the door becoming heavy and difficult to open and close.
　本発明は上記従来の問題点に着目して為されたものであり、既存の室内に後付けで簡単に付設できて、音響調整や防音の要求に答えられる、新規且つ有用なアクティブ音波コントロールシステムを提供することを、その目的とする。 The present invention has been made by paying attention to the above-mentioned conventional problems, and is a new and useful active sound wave control system that can be easily retrofitted into an existing room and can respond to acoustic adjustment and soundproofing requirements. Its purpose is to provide.
　本発明は上記課題を解決するためになされたものであり、請求項１の発明は、マイクロホンと、前記マイクロホンで集められた音波を逆位相に変換する逆位相変換部と、前記逆位相変換部で逆位相に変換された音波を振動として出力する加振器と、前記加振器から受け取った振動を音波として出力する振動体とで構成され、前記振動体から発する音波を取り除きたい音波に重ね合わせることで能動的にその音波を取り除くことを特徴とするアクティブ音波コントロールシステムである。 The present invention has been made to solve the above problems, and the invention of claim 1 is directed to a microphone, an antiphase converter that converts sound waves collected by the microphone into an antiphase, and the antiphase converter. And a vibrator that outputs the sound wave converted into the opposite phase as vibration and a vibration body that outputs the vibration received from the vibrator as sound wave, and superimposes the sound wave emitted from the vibrator on the sound wave to be removed. The active sound wave control system is characterized by actively removing the sound wave by combining them.
　請求項２の発明は、請求項１に記載したアクティブ音波コントロールシステムにおいて、振動体は、パネル、ドア等の単一構造体で構成されていることを特徴とするアクティブ音波コントロールシステムである。 The invention of claim 2 is the active sound wave control system according to claim 1, wherein the vibrating body is constituted by a single structure such as a panel, a door or the like.
　請求項３の発明は、請求項１または２に記載したアクティブ音波コントロールシステムにおいて、マイクロホンで集められた音波の周波数のうち、取り除きたい周波数を選択する周波数選択部を備え、前記周波数選択部で選択された周波数の音波を逆位相に変換することを特徴とするアクティブ音波コントロールシステムである。 According to a third aspect of the present invention, in the active sound wave control system according to the first or second aspect of the present invention, the active sound wave control system includes a frequency selection unit that selects a frequency to be removed from the frequencies of the sound waves collected by the microphone, It is an active sound wave control system characterized by converting a sound wave of a specified frequency into an antiphase.
　請求項４の発明は、請求項３に記載したアクティブ音波コントロールシステムにおいて、周波数選択部が、マイクロホンで集められた音波の周波数を分析する周波数分析部と、分析された周波数のうち取り除きたい周波数を選別する周波数選別部とで構成されていることを特徴とするアクティブ音波コントロールシステムである。 According to a fourth aspect of the present invention, in the active sound wave control system according to the third aspect, the frequency selecting unit analyzes the frequency of the sound wave collected by the microphone, and the frequency to be removed from the analyzed frequencies. An active sound wave control system comprising a frequency sorting unit for sorting.
　請求項５の発明は、請求項３に記載したアクティブ音波コントロールシステムにおいて、周波数選択部が、選択要求を受け取る操作部を備えていることを特徴とするアクティブ音波コントロールシステムである。 The invention of claim 5 is the active sound wave control system according to claim 3, wherein the frequency selection unit includes an operation unit for receiving a selection request.
　本発明のアクティブ音波コントロールシステムによれば、既存の室内に後付けで簡単に付設できて、音響調整や防音の要求に答えられる、新規且つ有用なアクティブ音波コントロールシステムを提供することを、その目的とする。 According to the active sound wave control system of the present invention, it is an object of the present invention to provide a new and useful active sound wave control system which can be easily attached later in an existing room and which can meet the demands of sound adjustment and sound insulation. To do.
本発明の実施の形態に係るアクティブ音波コントロールシステムの概略的説明図である。It is a schematic explanatory drawing of the active sound wave control system which concerns on embodiment of this invention. 図１の電気的ブロック図である。FIG. 2 is an electrical block diagram of FIG. 1. 図１のアクティブ音波コントロールシステムの第１例の設置状態の説明図である。It is explanatory drawing of the installation state of the 1st example of the active sound wave control system of FIG. 図２の一部変更した電気的ブロック図である。FIG. 3 is a partially modified electrical block diagram of FIG. 2. 図１のアクティブ音波コントロールシステムの第２例の設置状態の説明図である。It is explanatory drawing of the installation state of the 2nd example of the active sound wave control system of FIG. 図４の一部変更した電気的ブロック図である。FIG. 5 is a partially modified electrical block diagram of FIG. 4.
　本発明の実施の形態に係るアクティブ音波コントロールシステム１について、図面にしたがって説明する。
　図１に示すように、アクティブ音波コントロールシステム１は、マイクロホン３、コントローラ５、加振器７、振動体９で構成されており、コントローラ５に対して、マイクロホン３と加振器７がケーブル１１を介して電気的に接続されている。
　加振器７には振動体９が接触状態で取り付けられており、振動接続状態となっている。この振動体９は単一構造で薄板状に構成されたものであり、その一方の板面の中心に加振器７が固定されるようになっている。 An active sound wave control system 1 according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the active sound wave control system 1 includes a microphone 3, a controller 5, a vibrator 7, and a vibrating body 9, and the microphone 3 and the vibrator 7 are connected to the controller 5 with a cable 11. It is electrically connected via.
A vibrator 9 is attached to the vibrator 7 in a contact state and is in a vibration connection state. The vibrating body 9 has a single structure and is formed in a thin plate shape, and the vibrator 7 is fixed to the center of one of the plate surfaces.
　振動体９は、フラットなドア（Ｄ）、パネル（Ｐ）等で代用できるようになっている。
　コントローラ５には、電源プラグ１３が取り付けられたケーブル１１も接続されており、この電源プラグ１３がコンセントに差込まれると、商用電源がシステム系に供給されて起動するようになっている。 The vibrating body 9 can be replaced by a flat door (D), a panel (P), or the like.
A cable 11 to which a power plug 13 is attached is also connected to the controller 5, and when the power plug 13 is plugged into an outlet, commercial power is supplied to the system system and is activated.
　図２の電気的ブロック図に示すように、コントローラ５の筐体１５内には、種々の処理部が収容されている。
　マイクロホン３で集められた音波は、アナログ信号として出力されて、周波数逆位相変換部１７に入力される。この周波数逆位相変換部１７で、位相が反転された反転信号が出力され、増幅器（アンプ）１９に入力される。そして、この増幅器（アンプ）１９で増幅されて、加振器７に送出される。増幅器（アンプ）１９には、調整ボリューム（図示省略）が設けられている。
　振動体９は加振器７からの振動を受けて振動すると、音波を発生して空気中に放出する。増幅器（アンプ）１９から加振器７までは、位相の遅延要素が無いので、この放出された音波は、マイクロホン３で集められた音波の位相を逆転したものとなっている。また、増幅が調整されて、マイクロホン３で集められた音波と同振幅で振動体９から音波が放出されるようになっている。 As shown in the electrical block diagram of FIG. 2, various processing units are accommodated in the housing 15 of the controller 5.
The sound waves collected by the microphone 3 are output as analog signals and input to the frequency anti-phase conversion unit 17. In the frequency anti-phase conversion unit 17, an inverted signal whose phase is inverted is output and input to an amplifier (amplifier) 19. Then, it is amplified by this amplifier (amplifier) 19 and sent to the vibrator 7. The amplifier (amplifier) 19 is provided with an adjustment volume (not shown).
When the vibrating body 9 receives vibration from the vibrator 7 and vibrates, it generates a sound wave and releases it into the air. Since there is no phase delay element from the amplifier (amplifier) 19 to the vibrator 7, the emitted sound wave is obtained by reversing the phase of the sound wave collected by the microphone 3. Further, the amplification is adjusted, and the sound wave is emitted from the vibrating body 9 with the same amplitude as the sound wave collected by the microphone 3.
　このアクティブ音波コントロールシステム１は、単純な防音目的となっており、部屋の防音用にその都度手軽に利用できる。
　図３は、その設置例を示す。
　マイクロホン３をドア（Ｄ）枠の上側近傍に、集音側が部屋の中心側を向くように取付け、コントローラ５をその近くで壁面に固定する。また、ドア（Ｄ）の部屋側を向いている板面の中心部に加振器７を固定する。加振器７は両面テープ等の接着手段（図示省略）を介して固定されるので、取り外しは容易となっている。電源プラグ１３を部屋の側壁（Ｓ）に備付けのコンセント（Ｃ）に差込むだけで、その既存のドア（Ｄ）が防音ドアとなる。 This active sound wave control system 1 has a simple soundproofing purpose and can be easily used for soundproofing a room each time.
FIG. 3 shows an example of the installation.
The microphone 3 is attached to the vicinity of the upper side of the door (D) frame so that the sound collection side faces the center of the room, and the controller 5 is fixed to the wall surface in the vicinity thereof. Moreover, the vibrator 7 is fixed to the center part of the plate surface facing the room side of the door (D). Since the vibrator 7 is fixed via an adhesive means (not shown) such as a double-sided tape, it is easy to remove. By simply inserting the power plug 13 into the outlet (C) provided on the side wall (S) of the room, the existing door (D) becomes a soundproof door.
　ドア（Ｄ）の厚さや材質は防音仕様になっていなくとも、ピアノ等の音源から放出された音波をマイクロホン３が集めると、ドア（Ｄ）からその逆位相で同振幅の消音用音波が放出されるので、ドア（Ｄ）に向かう音波にその消音用音波が重ね合って打ち消される。従って、ドア（Ｄ）の外に音源からの音が漏れない。
　このようにして、通常の木材や樹脂製のドア（Ｄ）を簡単に防音ドアに代えることができる。
　また、コントローラ５もこの場合には、アナログ回路で構成することが可能となっている。 Even if the thickness and material of the door (D) are not soundproofing, when the microphone 3 collects sound waves emitted from a sound source such as a piano, a sound-deadening sound wave with the same amplitude is emitted from the door (D) in the opposite phase. Therefore, the sound wave for mute is superimposed on the sound wave toward the door (D) and canceled. Therefore, the sound from the sound source does not leak out of the door (D).
In this way, the normal wood or resin door (D) can be easily replaced with a soundproof door.
In this case, the controller 5 can also be constituted by an analog circuit.
　図１のアクティブ音波コントロールシステム１は、特定の周波数を選択してその周波数の音波を打ち消すように構成することもできる。
　図４は、図２の電気的ブロック図の一部変更したものであり、コントローラ５の内部構成が異なっている。
　マイクロホン３で集められた音波は、アナログ信号として出力された後、Ａ／Ｄ変換部２１でデジタル信号に変換されて、周波数分析部２３に入力される。この周波数分析部２３で、周知のＦＦＴ（高速フーリエ変換）による周波数分析が行われ、周波数領域に変換される。従って、残響時間の長い周波数を周波数軸上の位置で捉えることができるようになる。周波数選別部２５では、周波数分析後の各周波数成分のうち残響時間が長い周波数成分が自動的に選別されて出力される。
　この周波数成分が、Ｄ／Ａ変換部２７でアナログ信号に変換され、周波数逆位相変換部１７に入力されるようになっている。
　周波数分析部２３や周波数選別部２５を実現するために、マイクロプロセッサやデジタルプロセッサ等のコンピュータが使用されており、内蔵のＲＯＭに格納された処理手順を内臓のＣＰＵが実行することにより、動作が制御されている。 The active sound wave control system 1 of FIG. 1 can also be configured to select a specific frequency and cancel the sound wave of that frequency.
FIG. 4 is a partial modification of the electrical block diagram of FIG. 2, and the internal configuration of the controller 5 is different.
The sound wave collected by the microphone 3 is output as an analog signal, then converted into a digital signal by the A / D converter 21 and input to the frequency analyzer 23. The frequency analysis unit 23 performs frequency analysis by a well-known FFT (Fast Fourier Transform) and converts it to the frequency domain. Therefore, a frequency having a long reverberation time can be captured at a position on the frequency axis. The frequency selection unit 25 automatically selects and outputs a frequency component having a long reverberation time among frequency components after frequency analysis.
This frequency component is converted into an analog signal by the D / A converter 27 and input to the frequency anti-phase converter 17.
A computer such as a microprocessor or a digital processor is used to implement the frequency analysis unit 23 and the frequency selection unit 25, and the operation is performed when the built-in CPU executes the processing procedure stored in the built-in ROM. It is controlled.
　アクティブ音波コントロールシステム１は、上記したようにコントローラ５を変更することができ、周波数が選択できる特徴を生かして、部屋の音響環境の調整に利用できる。
　図５は、その設置例を示す。
　マイクロホン３を側壁の上側に、集音側が部屋の中心側を向くように取付け、コントローラ５をその近くで壁面に固定する。また、四角形のパネル（Ｐ）を部屋の三方の側壁（Ｓ）と、天井（Ｔ）にそれぞれ固定する。そして、それぞれのパネル（Ｐ）の中心部に加振器７を取り外し自在に固定する。また、残りの側壁（Ｓ）側には、図３に示すドア（Ｄ）が設けられているので、そのドア（Ｄ）に図３と同様にして加振器７を固定する。なお、視認の便宜のために、ケーブル１１は図示省略されている。 The active sound wave control system 1 can change the controller 5 as described above, and can be used for adjusting the acoustic environment of the room by utilizing the feature that the frequency can be selected.
FIG. 5 shows an example of the installation.
The microphone 3 is attached to the upper side of the side wall so that the sound collecting side faces the center of the room, and the controller 5 is fixed to the wall surface in the vicinity thereof. A square panel (P) is fixed to the three side walls (S) and the ceiling (T) of the room. And the vibrator 7 is detachably fixed to the center part of each panel (P). Moreover, since the door (D) shown in FIG. 3 is provided in the remaining side wall (S) side, the vibrator 7 is fixed to the door (D) similarly to FIG. The cable 11 is not shown for the convenience of visual recognition.
　さらに、図３と同様に、電源プラグ１３をコンセント（Ｃ）に差込んで、システムを起動させる。
　ピアノ（Ａ）等の音源から放出された音波をマイクロホン３が集めると、その音波のうち残響の発生要因となる残響時間の長い周波数の音波が、「取り除きたい音」として選別され、パネル（Ｐ）やドア（Ｄ）からその逆位相で同振幅の消音用音波が放出されるので、部屋内の音響環境が能動的に改善される。 Further, as in FIG. 3, the power plug 13 is inserted into the outlet (C) to start the system.
When the microphone 3 collects the sound waves emitted from the sound source such as the piano (A), the sound waves having a long reverberation time that cause reverberation are selected as “sounds to be removed” from the sound waves, and the panel (P ) And the door (D), and the sound wave for silencing with the same amplitude is emitted in the opposite phase, the acoustic environment in the room is actively improved.
　図６は、図４の一部の変更例であり、操作部として、複数の周波数の選択ボタン２９が設けられている。この選択ボタン２９はスイッチ回路のスイッチを構成しており、周波数選別部２５は、この選択ボタン２９が押下されると、該当する周波数が選別されて出力されるようになっている。
　従って、「取り除きたい音」を人の意思によって選別することが可能になっており、自分専用の音場を容易に作り出せる。低い音から高い音まで、音の高さにより残響もまちまちなので、どの高さでもほぼ同じ残響の長さだと、周波数特性が良いと言われているが、積極的に残響を作りたい場合に有用である。 FIG. 6 is a partial modification of FIG. 4, and a plurality of frequency selection buttons 29 are provided as an operation unit. The selection button 29 constitutes a switch of a switch circuit, and when the selection button 29 is pressed, the frequency selection unit 25 selects and outputs the corresponding frequency.
Therefore, it is possible to select “sounds to be removed” according to the intention of a person, and it is possible to easily create a sound field dedicated to oneself. Since the reverberation varies from low to high, depending on the pitch, it is said that the frequency characteristics are good at almost the same reverberation length at any height, but it is useful when you want to actively create reverberation. It is.
　以上、本発明の実施の形態について詳述してきたが、具体的構成は、この実施の形態に限られるものではなく、本発明の要旨を逸脱しない範囲における設計の変更などがあっても発明に含まれる。
　例えば、振動体は、室内にて振動できるものであればよく、上記実施の形態では、邪魔にならないように側壁に取り付けたパネルを振動体として使用したり、ドアを防音用に変えるためにドア自体を振動体として使用したりしているが、それらの形状に限定されず、凹凸のある三次元状のものでも良いので、彫刻や中空の花瓶等の陶器でも代用できる。 The embodiment of the present invention has been described in detail above. However, the specific configuration is not limited to this embodiment, and the present invention can be changed even if there is a design change without departing from the gist of the present invention. included.
For example, the vibrating body may be anything that can vibrate indoors. In the above embodiment, a panel attached to the side wall is used as a vibrating body so as not to get in the way, or a door is used to change the door for soundproofing. Although it itself is used as a vibrating body, it is not limited to those shapes, and since it may be a three-dimensional shape with unevenness, ceramics such as engravings and hollow vases can be substituted.
　本発明のアクティブ音波コントロールシステムによれば、施工も簡単で、非常にコンパクトに構築できるので、室内環境から騒音をシャットアウトしたい部屋や工場でも手軽に採用できる。
　さらには、船舶の本体に振動体を設置すれば、船舶特有のエンジン音が船体に固体伝搬している場合にその音を低減することもできる。 According to the active sound wave control system of the present invention, it is easy to construct and can be constructed very compactly. Therefore, it can be easily adopted in a room or factory where it is desired to shut out noise from the indoor environment.
Furthermore, if a vibrating body is installed in the main body of the ship, the sound can be reduced when the engine sound peculiar to the ship is propagating solidly to the hull.
　１…アクティブ音波コントロールシステム
　３…マイクロホン　　　５…コントローラ　　　７…加振器
　９…振動体　　　１１…ケーブル　　　１３…電源プラグ
１５…（コントローラの）筐体　　　１７…逆位相変換部
１９…増幅器（アンプ）　　　２１…Ａ／Ｄ変換部
２３…周波数分析部　　　２５…周波数選別部
２７…Ｄ／Ａ変換部　　　２９…選択ボタン
Ｄ…ドア　　　Ｐ…パネル　　　Ａ…ピアノ
Ｓ…（部屋の）側壁　　　Ｔ…（部屋の）天井 DESCRIPTION OF SYMBOLS 1 ... Active sound wave control system 3 ... Microphone 5 ... Controller 7 ... Vibrator 9 ... Vibrating body 11 ... Cable 13 ... Power plug 15 ... (Controller) housing | casing 17 ... Reverse phase conversion part 19 ... Amplifier (amplifier) 21 ... A / D conversion unit 23 ... frequency analysis unit 25 ... frequency selection unit 27 ... D / A conversion unit 29 ... select button D ... door P ... panel A ... piano S ... side wall T ... (room) ceiling

Claims (5)

  1. 　マイクロホンと、前記マイクロホンで集められた音波を逆位相に変換する逆位相変換部と、前記逆位相変換部で逆位相に変換された音波を振動として出力する加振器と、前記加振器から受け取った振動を音波として出力する振動体とで構成され、
    　前記振動体から発する音波を取り除きたい音波に重ね合わせることで能動的にその音波を取り除くことを特徴とするアクティブ音波コントロールシステム。     A microphone, an antiphase converter that converts sound waves collected by the microphone into an antiphase, an exciter that outputs the sound waves converted into an antiphase by the antiphase converter as vibrations, and the vibrator It consists of a vibrating body that outputs the received vibration as a sound wave,
    An active sound wave control system, wherein a sound wave emitted from the vibrating body is superposed on a sound wave to be removed to actively remove the sound wave.
  2. 　請求項１に記載したアクティブ音波コントロールシステムにおいて、
    　振動体は、パネル、ドア等の単一構造体で構成されていることを特徴とするアクティブ音波コントロールシステム。     The active sound wave control system according to claim 1,
    The active sound wave control system, wherein the vibrating body is composed of a single structure such as a panel and a door.
  3. 　請求項１または２に記載したアクティブ音波コントロールシステムにおいて、マイクロホンで集められた音波の周波数のうち、取り除きたい周波数を選択する周波数選択部を備え、前記周波数選択部で選択された周波数の音波を逆位相に変換することを特徴とするアクティブ音波コントロールシステム。 3. The active sound wave control system according to claim 1, further comprising a frequency selection unit that selects a frequency to be removed from the frequencies of the sound waves collected by the microphone, and reverses the sound wave of the frequency selected by the frequency selection unit. An active sound wave control system characterized by converting into a phase.
  4. 　請求項３に記載したアクティブ音波コントロールシステムにおいて、周波数選択部が、マイクロホンで集められた音波の周波数を分析する周波数分析部と、分析された周波数のうち取り除きたい周波数を選別する周波数選別部とで構成されていることを特徴とするアクティブ音波コントロールシステム。 The active sound wave control system according to claim 3, wherein the frequency selection unit includes a frequency analysis unit that analyzes a frequency of the sound wave collected by the microphone, and a frequency selection unit that selects a frequency to be removed from the analyzed frequencies. An active sound wave control system characterized by comprising.
  5. 　請求項３に記載したアクティブ音波コントロールシステムにおいて、
    　周波数選択部が、選択要求を受け取る操作部を備えていることを特徴とするアクティブ音波コントロールシステム。     The active sound wave control system according to claim 3,
    An active sound wave control system, wherein the frequency selection unit includes an operation unit that receives a selection request.
PCT/JP2014/006320 2014-01-20 2014-12-18 Active sound wave control system WO2015107605A1 (en)

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