JPH0553587A - Device noise cancellation system - Google Patents
Device noise cancellation systemInfo
- Publication number
- JPH0553587A JPH0553587A JP3213939A JP21393991A JPH0553587A JP H0553587 A JPH0553587 A JP H0553587A JP 3213939 A JP3213939 A JP 3213939A JP 21393991 A JP21393991 A JP 21393991A JP H0553587 A JPH0553587 A JP H0553587A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- noise
- phase
- generated
- stationary
- 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.)
- Withdrawn
Links
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、音響ノイズを制御する
方式、特に装置（例えばコンピュータシステム）から出
る定常音響ノイズを制御する方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling acoustic noise, and more particularly to a method for controlling stationary acoustic noise emitted from a device (for example, a computer system).
【０００２】[0002]
【従来の技術】従来のコンピュータ装置は、装置から出
る熱気を排気する為のファンやその他必要な機能を実現
する為のモータを実装している。2. Description of the Related Art A conventional computer device is equipped with a fan for discharging hot air from the device and a motor for realizing other necessary functions.
【０００３】[0003]
【発明が解決しようとする課題】従来のコンピュータ装
置では、排気ファン及びモータなどにより定常ノイズを
発生しており、このノイズは吸音材及び装置筺体の構造
強化により抑制している。しかしこの方法はパッシブ型
抑制方式であるため、ノイズ特性により抑制材料が異な
るので多種の材料を用意しなければならならず、また装
置ノイズ発生源の経年変化によるノイズ特性変化に追従
不可であり、更に製造装置毎に方式が異なる為設計コス
トが掛かると言う問題点があった。In the conventional computer device, steady noise is generated by the exhaust fan and the motor, and this noise is suppressed by strengthening the structure of the sound absorbing material and the device housing. However, since this method is a passive suppression method, different materials must be prepared because the suppression material differs depending on the noise characteristics, and it is not possible to follow the noise characteristics change due to the secular change of the device noise generation source, Further, there is a problem that the design cost is increased because the method is different for each manufacturing apparatus.
【０００４】本発明は、コンピュータなどの場合、その
ノイズ源は一般にモータ等の回転機構で構成される為、
そのノイズ特性がランダム性ノイズではなく周期性を有
する定常ランダム性ノイズが主に含まれていることに注
目して、この定常ノイズ特性を利用しノイズを抑制する
手法を実現しようとするものである。According to the present invention, in the case of a computer or the like, the noise source thereof is generally composed of a rotating mechanism such as a motor.
It is intended to realize a method of suppressing noise by utilizing this stationary noise characteristic, noting that the noise characteristic mainly includes stationary random noise having periodicity rather than random noise. ..
【０００５】[0005]
【課題を解決するための手段】本発明によれば、装置が
発生する定常音響ノイズと逆位相の信号を発生しフィー
ドバックして該定常ノイズの発生する音場の音圧を抑制
することを特徴とする装置ノイズキャンセる方式が得ら
れる。According to the present invention, a signal having a phase opposite to that of the stationary acoustic noise generated by the device is generated and fed back to suppress the sound pressure of the sound field generated by the stationary noise. A device noise canceling method can be obtained.
【０００６】また本発明によれば、装置が発生する音響
ノイズを抑制したい音響空間でその音響ノイズを捉える
マイクロフォンと、そのマイクロフォンの発生する信号
からこの信号と逆位相の信号を発生させる逆位相信号発
生手段と、該発生した逆位相信号を増幅し音場へ出力す
る手段とを備えている装置ノイズキャンセラーが得られ
る。Further, according to the present invention, a microphone for capturing acoustic noise in an acoustic space in which it is desired to suppress the acoustic noise generated by the device, and an anti-phase signal for generating a signal having a phase opposite to this signal from the signal generated by the microphone. An apparatus noise canceller having a generating means and means for amplifying the generated anti-phase signal and outputting it to a sound field can be obtained.
【０００７】更に本発明によれば、装置が発生する音響
ノイズを抑制したい音響空間でその音響ノイズを捉える
マイクロフォンと、そのマイクロフォンの発生する信号
の位相周期、および振幅を含む定常信号を抽出するノイ
ズ抽出信号処理機と、抽出された情報を基に前記マイク
ロフォンの発生する信号と１８０°位相を変化させた信
号を発生させる逆位相信号処理機と、発生した逆位相信
号を原信号と同じ高さまで増幅する増幅器と、該増幅し
た音響信号を空間へ出力するスピーカとを備えている装
置ノイズキャンセラーが得られる。Further, according to the present invention, a microphone for capturing acoustic noise generated by the device in an acoustic space where it is desired to suppress the noise, and a noise for extracting a stationary signal including a phase period and an amplitude of a signal generated by the microphone. An extraction signal processor, an anti-phase signal processor that generates a signal whose phase is changed by 180 ° with the signal generated by the microphone based on the extracted information, and the generated anti-phase signal up to the same height as the original signal. A device noise canceller including an amplifier for amplifying and a speaker for outputting the amplified acoustic signal to space can be obtained.
【０００８】[0008]
【実施例】次に本発明について、図面を参照して説明す
る。The present invention will be described below with reference to the drawings.
【０００９】図１は本発明の一実施例のブロック図であ
る。装置１内にノイズ発生源２が存在する。このノイズ
源は一般にモータ等の回転機構で構成される為、ノイズ
特性としてランダム性ノイズではなく、周期性を有する
定常ランダム性ノイズが主に含まれている。マイクロフ
ォン３はこの定常ランダム性ノイズである音響信号を電
気信号に変換する。ノイズ抽出信号処理機４はこの変換
された電気信号のノイズの周期、振幅、および位相を実
時間で抽出する。逆位相信号処理機５はこの抽出された
情報によりマイクロホンの発生した信号と１８０°位相
を変化させた逆位相信号に変換する。FIG. 1 is a block diagram of an embodiment of the present invention. A noise source 2 is present in the device 1. Since this noise source is generally composed of a rotating mechanism such as a motor, the noise characteristics mainly include stationary random noise having periodicity rather than random noise. The microphone 3 converts the acoustic signal, which is the stationary random noise, into an electric signal. The noise extraction signal processor 4 extracts the period, amplitude, and phase of noise of this converted electric signal in real time. The anti-phase signal processor 5 converts the signal generated by the microphone into an anti-phase signal whose phase is changed by 180 ° based on the extracted information.
【００１０】この逆位相信号は増幅器６によりマイクロ
フォン入力時の信号振幅と同等の振幅まで増幅される。
そして増幅された電気信号はスピーカ７により音響信号
に変換され外部へ放出される。This anti-phase signal is amplified by the amplifier 6 to an amplitude equivalent to the signal amplitude when the microphone is input.
Then, the amplified electric signal is converted into an acoustic signal by the speaker 7 and is emitted to the outside.
【００１１】これにより装置１で発生する定常ノイズ源
２の発する音響信号と、各処理機により生成された逆位
相信号の音響信号が打ち消され、測定点でのノイズを最
大限に抑制する事になる。As a result, the acoustic signal generated by the stationary noise source 2 generated by the apparatus 1 and the acoustic signal of the anti-phase signal generated by each processor are canceled, and the noise at the measurement point is suppressed to the maximum. Become.
【００１２】図２は、図１で説明した信号の流れを示し
たものである。FIG. 2 shows the signal flow described in FIG.
【００１３】ノイズ源２のノイズａはマイクロフォン３
によりマイクロフォン出力信号ｂとして忠実に取込まれ
る。すなわち位相ひずみは発生しない。ノイズ抽出信号
処理機４はマイクロフォン出力信号ｂから位相、周期、
振幅の情報信号ｃを抽出する。この情報信号ｃを数式で
表せば下記の数式１で表せる。The noise a of the noise source 2 is the microphone 3
Is faithfully captured as a microphone output signal b. That is, no phase distortion occurs. The noise extraction signal processor 4 detects the phase, the cycle,
The information signal c of the amplitude is extracted. If this information signal c is expressed by a mathematical expression, it can be expressed by the following mathematical expression 1.
【００１４】[0014]
【数１】 [Equation 1]
【００１５】上記のようにして得られた情報信号ｃを逆
位相信号処理機５へ入れると逆位相信号ｄが出力され
る。この逆位相信号ｄは、振幅がノイズ源と異なる為、
増幅器６により振幅し出力信号ｅとして得る。この信号
ｅを電気信号から音響信号としてスピーカ７から出力ｆ
として音場へ放射する。When the information signal c obtained as described above is input to the anti-phase signal processor 5, an anti-phase signal d is output. Since the amplitude of the anti-phase signal d is different from that of the noise source,
The signal is amplified by the amplifier 6 and obtained as the output signal e. This signal e is output from the speaker 7 as an acoustic signal from an electric signal f
Radiates into the sound field as.
【００１６】これによりノイズａとスピーカ出力ｆを合
成すると、得られる測定空間の音場合成波ｇは、位相が
互いに逆と成っているので音圧は０に近づき、ノイズの
抑制が実現される。As a result, when the noise a and the speaker output f are combined, the sound case wave g in the obtained measurement space has phases opposite to each other, so that the sound pressure approaches 0, and noise suppression is realized. ..
【００１７】[0017]
【発明の効果】以上説明したように、本発明の装置ノイ
ズキャンセル方式は、ノイズ発生源から出る音響ノイズ
を電気的にリアルタイムでフィードバックするアクティ
ブ型ノイズキャンセル方式である為、ノイズ特性に左右
されず、装置ノイズの変化に追従出来、且つ、ノイズが
定常ノイズであるかぎり装置固有の手法は必要なく一定
方法で良い為、開発設計コストは低下する。As described above, the device noise canceling method of the present invention is an active type noise canceling method which electrically feeds back acoustic noise from a noise generation source in real time, and therefore is not affected by noise characteristics. As long as the device noise can be changed and the noise is stationary noise, a device-specific method is not necessary and a fixed method can be used, so that the development and design cost is reduced.
【図１】本発明の一実施例のブロック図である。FIG. 1 is a block diagram of an embodiment of the present invention.
【図２】図１の信号の流れと特性を示した図である。FIG. 2 is a diagram showing the flow and characteristics of the signals of FIG.
１ 装置 ２ 定常ノイズ源 ３ マイクロフォン ４ ノイズ抽出信号処理機 ５ 逆位相信号処理機 ６ 増幅器 ７ スピーカ ａ ノイズ ｂ マイクロフォン出力信号 ｃ 情報信号 ｄ 逆位相信号 ｅ 増幅器出力信号 ｆ スピーカ出力 ｇ 音場合成波 1 Device 2 Stationary noise source 3 Microphone 4 Noise extraction signal processor 5 Reverse phase signal processor 6 Amplifier 7 Speaker a Noise b Microphone output signal c Information signal d Reverse phase signal e Amplifier output signal f Speaker output g Sound case
Claims (3)
の信号を発生しフィードバックして該定常ノイズの発生
する音場の音圧を抑制することを特徴とする装置ノイズ
キャンセル方式。1. A device noise canceling method, wherein a signal having a phase opposite to that of stationary acoustic noise generated by the device is generated and fed back to suppress the sound pressure in the sound field where the stationary noise is generated.
音響空間でその音響ノイズを捉えるマイクロフォンと、
そのマイクロフォンの発生する信号からこの信号と逆位
相の信号を発生させる逆位相信号発生手段と、該発生し
た逆位相信号を増幅し音場へ出力する手段とを備えてい
る装置ノイズキャンセラー。2. A microphone for capturing acoustic noise in an acoustic space in which it is desired to suppress the acoustic noise generated by the device,
An apparatus noise canceller comprising an anti-phase signal generating means for generating a signal having a phase opposite to this signal from a signal generated by the microphone, and means for amplifying the generated anti-phase signal and outputting the amplified anti-phase signal to a sound field.
音響空間でその音響ノイズを捉えるマイクロフォンと、
そのマイクロフォンの発生する信号の位相、周期、およ
び振幅を含む定常信号を抽出するノイズ抽出信号処理機
と、抽出された情報を基に前記マイクロフォンの発生す
る信号と１８０°位相を変化させた信号を発生させる逆
位相信号処理機と、発生した逆位相信号を原信号と同じ
高さまで増幅する増幅器と、該増幅した音響信号を空間
へ出力するスピーカとを備えている装置ノイズキャンセ
ラー。3. A microphone for capturing acoustic noise in an acoustic space in which it is desired to suppress the acoustic noise generated by the device,
A noise extraction signal processor that extracts a stationary signal that includes the phase, period, and amplitude of the signal generated by the microphone, and a signal that is 180 ° out of phase with the signal generated by the microphone based on the extracted information. An apparatus noise canceller comprising: a generated anti-phase signal processor; an amplifier that amplifies the generated anti-phase signal to the same height as the original signal; and a speaker that outputs the amplified acoustic signal to space.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3213939A JPH0553587A (en) | 1991-08-26 | 1991-08-26 | Device noise cancellation system |
| US08/154,116 US5474941A (en) | 1990-12-28 | 1993-11-18 | Method for producing an active matrix substrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3213939A JPH0553587A (en) | 1991-08-26 | 1991-08-26 | Device noise cancellation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0553587A true JPH0553587A (en) | 1993-03-05 |
Family
ID=16647552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3213939A Withdrawn JPH0553587A (en) | 1990-12-28 | 1991-08-26 | Device noise cancellation system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0553587A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61281305A (en) * | 1985-06-06 | 1986-12-11 | Toyota Motor Corp | Articulated robot control device |
| US5702230A (en) * | 1996-01-29 | 1997-12-30 | General Electric Company | Actively controlled acoustic treatment panel |
| JP2007026385A (en) * | 2005-07-21 | 2007-02-01 | Nippon Telegr & Teleph Corp <Ntt> | Leakage signal observation type of device for preventing information leakage |
| US9558755B1 (en) | 2010-05-20 | 2017-01-31 | Knowles Electronics, Llc | Noise suppression assisted automatic speech recognition |
-
1991
- 1991-08-26 JP JP3213939A patent/JPH0553587A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61281305A (en) * | 1985-06-06 | 1986-12-11 | Toyota Motor Corp | Articulated robot control device |
| JPH0553587B2 (en) * | 1985-06-06 | 1993-08-10 | Toyota Motor Co Ltd | |
| US5702230A (en) * | 1996-01-29 | 1997-12-30 | General Electric Company | Actively controlled acoustic treatment panel |
| JP2007026385A (en) * | 2005-07-21 | 2007-02-01 | Nippon Telegr & Teleph Corp <Ntt> | Leakage signal observation type of device for preventing information leakage |
| JP4676831B2 (en) * | 2005-07-21 | 2011-04-27 | 日本電信電話株式会社 | Leakage signal observation type information leakage prevention device |
| US9558755B1 (en) | 2010-05-20 | 2017-01-31 | Knowles Electronics, Llc | Noise suppression assisted automatic speech recognition |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19981112 |