JP2004354886A - Noise reduction apparatus - Google Patents

Noise reduction apparatus Download PDF

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Publication number
JP2004354886A
JP2004354886A JP2003154911A JP2003154911A JP2004354886A JP 2004354886 A JP2004354886 A JP 2004354886A JP 2003154911 A JP2003154911 A JP 2003154911A JP 2003154911 A JP2003154911 A JP 2003154911A JP 2004354886 A JP2004354886 A JP 2004354886A
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Japan
Prior art keywords
microphone
noise reduction
monitor speaker
sound
frequency
Prior art date
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Pending
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JP2003154911A
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Japanese (ja)
Inventor
Kenji Kameyama
賢士 亀山
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Ricoh Co Ltd
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Ricoh Co Ltd
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Priority to JP2003154911A priority Critical patent/JP2004354886A/en
Publication of JP2004354886A publication Critical patent/JP2004354886A/en
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  • Facsimiles In General (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To achieve space saving and cost reduction, and generate anti-phase sound to optimally counteract the noise generated. <P>SOLUTION: A noise reduction apparatus includes a monitor speaker 22 arranged inside the apparatus for transmitting the status of the apparatus by sound, a microphone 19 connected with the monitor speaker 22 in parallel, and an inverse-phase generation circuit 20 for converting an input signal from the microphone 19 into an anti-phase signal. The apparatus can adjust output levels and frequencies from the microphone 19 to the monitor speaker 22. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、画像形成装置の騒音を静める静音化装置の技術に関する。
【０００２】
【従来の技術】
スピーカとマイクと逆位相生成回路（ＤＳＰ回路）を備え、マイクで集めた音を逆位相でスピーカに出力することで静音化する静音化装置は、特許文献１に提案されている。また特許文献２にもオーディオ装置において、同様の技術によりスピーカの静音化を図ることが提案されている。
【特許文献１】特開平０６−００８５８１号公報
【特許文献２】特開平０８−３１４４７４号公報
【０００３】
【発明が解決しようとする課題】
しかし従来技術では、機器本体外部に専用のスピーカを備えているため、コスト的に不利である。ここで画像形成装置他、各種機器においては、内部モニタースピーカが備わっている。
また単に逆位相を生成しただけでは十分な静音（消音）化は実現できない。一般に、音源位置と逆位相の音源位置とが１／４波長ずれると逆位相による静音効果はなくなると言われている。従って波長の短い音では、音源位置と逆位相の音源位置とが異なると共振して音が大きくなる場合がある。
本発明はこのような背景に鑑みてなされたものであり、省スペース、低コスト化を図ること及び、発生騒音に最適な逆位相の音を発生させることを目的とする。
【０００４】
【課題を解決するための手段】
上記目的を達成するために、請求項１記載の発明は、機器の状態を音で伝えるために機器内部に設けられたモニタースピーカと、モニタースピーカに並列に接続されたマイクと、マイクからの入力信号を逆位相の信号に変換する逆位相生成回路とを備えた静音化装置を最も主要な特徴とする。
請求項２記載の発明は、請求項１記載の静音化装置において、マイクからのモニタースピーカへの出力レベル調整、周波数調整が可能である静音化装置を主要な特徴とする。
請求項３記載の発明は、請求項２記載の静音化装置において、マイクからのモニタースピーカへの出力レベル調整、周波数調整を行うボリュームを備えた静音化装置を主要な特徴とする。
請求項４記載の発明は、請求項２記載の静音化装置において、マイクからのモニタースピーカへの出力レベル調整、周波数調整を行う操作手段を備えた静音化装置を主要な特徴とする。
請求項５記載の発明は、請求項２記載の静音化装置において、マイクからのモニタースピーカへの出力信号を特定の周波数に限定した静音化装置を主要な特徴とする。
請求項６記載の発明は、請求項１記載の静音化装置において、対象となる機器はファクシミリ装置、複合機を含む画像形成装置である静音化装置を主要な特徴とする。
【０００５】
【発明の実施の形態】
以下、本発明の実施の形態を図面に従って説明する。
図１は本発明の実施の形態に係るファクシミリ装置の機構図、図２は同じく、機能ブロック図である。図１に示すように、本ファクシミリ装置は、光書込ユニット１、画像形成ユニツト２、給紙ユニット３を備える。
また図２に示すように、本ファクシミリ装置は、メモリ１１、ＮＣＵ１２、表示部１３、システムメモリ１４、制御部１５、読取部１６、操作部１７、書込部１８（光書込ユニット１に相当）、マイク１９、ＤＳＰ２０、周波数フィルタ２１、スピーカ（モニタースピーカ）２２、ボリューム２３を備える。ボリューム２３は、モニタースピーカ２２への出力レベルと周波数を調整するためのものである。
マイク１９から入った稼働音は、逆位相生成回路（ＤＳＰ２０及び周波数フィルタ２１）を通り、機器内部のモニタースピーカ２２から出力される。この際ボリューム２３で音量及び周波数が調整された音をモニタースピーカ２２から出力する。
マイク１９から入った稼働音が逆位相生成回路（ＤＳＰ２０及び周波数フィルタ２１）を通り、機器内部のモニタースピーカ２２から出力されることで、機器内部の音が逆位相で変換されることになり、モニタースピーカ２２から発する音の静音化を図ることができる。
また前述したように、波長の短い音では、音源位置と逆位相の音源位置とが異なると共振して音が大きくなる場合があるので、本発明では長い周波数に限定して逆位相を発生させる。ボリューム２３はその際に利用される。
またボリューム２３の代わりに操作部１７上にソフトボリュームスイッチを設け、操作部１７上でモニタースピーカ２２から出力される音を調整する（音量及び周波数）こともできる。
【０００６】
【発明の効果】
請求項１記載の発明によれば、逆位相によって静音化する場合に、専用のスピーカを用いることなく、安価に静音化を実現することができるようになる。また、静音化のためのスペースが最小限ですむようになる。
請求項２ないし５記載の発明によれば、マイクからのモニタースピーカへの出力レベル調整、周波数調整が可能であるので、状況に応じて静音化効果を最大限ならしめることができる。
請求項６記載の発明によれば、付加価値の高い画像形成装置を提供することができる。
【図面の簡単な説明】
【図１】本発明の実施の形態に係るファクシミリ装置の機構図である。
【図２】本発明の実施の形態に係るファクシミリ装置の機能ブロック図である。
【符号の説明】
１９ マイク
２０ ＤＳＰ（逆位相生成回路）
２１ 周波数フィルタ（逆位相生成回路構成要素）
２２ スピーカ（モニタースピーカ）
２３ ボリューム[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a technology of a noise reduction device for reducing noise of an image forming apparatus.
[0002]
[Prior art]
Patent Document 1 proposes a noise reduction device that includes a speaker, a microphone, and an anti-phase generation circuit (DSP circuit), and outputs sound collected by the microphone to the speaker in opposite phase to reduce noise. Japanese Patent Application Laid-Open No. H11-163873 proposes to reduce the noise of a loudspeaker by a similar technique in an audio device.
[Patent Document 1] Japanese Patent Application Laid-Open No. 06-008581 [Patent Document 2] Japanese Patent Application Laid-Open No. 08-314474 [0003]
[Problems to be solved by the invention]
However, in the related art, since a dedicated speaker is provided outside the device main body, it is disadvantageous in cost. Here, various apparatuses other than the image forming apparatus include an internal monitor speaker.
Further, sufficient silence (silence) cannot be achieved simply by generating the opposite phase. It is generally said that when the position of the sound source and the position of the sound source having the opposite phase are shifted by ４ wavelength, the silence effect due to the opposite phase is lost. Therefore, in the case of a sound having a short wavelength, if the position of the sound source is different from the position of the sound source having the opposite phase, resonance may occur and the sound may become loud.
The present invention has been made in view of such a background, and has as its object to save space and reduce cost, and to generate a sound having the opposite phase that is optimal for generated noise.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 includes a monitor speaker provided inside a device for transmitting a state of the device by sound, a microphone connected in parallel to the monitor speaker, and an input from the microphone. The most important feature is a noise reduction device including an anti-phase generation circuit that converts a signal into an anti-phase signal.
According to a second aspect of the present invention, the main feature of the noise reduction device according to the first aspect is that the output level from the microphone to the monitor speaker and the frequency can be adjusted.
According to a third aspect of the present invention, in the noise reduction apparatus according to the second aspect, the noise reduction apparatus includes a volume for adjusting an output level from a microphone to a monitor speaker and adjusting a frequency.
According to a fourth aspect of the present invention, there is provided the noise reduction apparatus according to the second aspect, which mainly includes an operation unit for adjusting an output level from a microphone to a monitor speaker and adjusting a frequency.
According to a fifth aspect of the present invention, in the noise reduction device according to the second aspect, a noise reduction device in which an output signal from a microphone to a monitor speaker is limited to a specific frequency is a main feature.
According to a sixth aspect of the present invention, in the noise reduction apparatus according to the first aspect, the target device is a noise reduction apparatus which is an image forming apparatus including a facsimile apparatus and a multifunction peripheral.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a mechanism diagram of a facsimile apparatus according to an embodiment of the present invention, and FIG. 2 is a functional block diagram similarly. As shown in FIG. 1, the facsimile machine includes an optical writing unit 1, an image forming unit 2, and a paper feeding unit 3.
As shown in FIG. 2, the facsimile apparatus includes a memory 11, an NCU 12, a display unit 13, a system memory 14, a control unit 15, a reading unit 16, an operation unit 17, and a writing unit 18 (corresponding to the optical writing unit 1). ), A microphone 19, a DSP 20, a frequency filter 21, a speaker (monitor speaker) 22, and a volume 23. The volume 23 is for adjusting the output level to the monitor speaker 22 and the frequency.
The operation sound input from the microphone 19 passes through the anti-phase generation circuit (the DSP 20 and the frequency filter 21) and is output from the monitor speaker 22 inside the device. At this time, the sound whose volume and frequency have been adjusted by the volume 23 is output from the monitor speaker 22.
The operation sound input from the microphone 19 passes through the anti-phase generation circuit (DSP 20 and the frequency filter 21) and is output from the monitor speaker 22 inside the device, so that the sound inside the device is converted in the opposite phase. The noise emitted from the monitor speaker 22 can be reduced.
As described above, in the case of a sound with a short wavelength, if the sound source position is different from the sound source position in the opposite phase, the sound may resonate and the sound may become loud. . The volume 23 is used at that time.
Also, a soft volume switch may be provided on the operation unit 17 instead of the volume 23, and the sound output from the monitor speaker 22 may be adjusted (volume and frequency) on the operation unit 17.
[0006]
【The invention's effect】
According to the first aspect of the present invention, when the noise is reduced by using the opposite phase, the noise can be reduced at low cost without using a dedicated speaker. In addition, the space for noise reduction can be minimized.
According to the second to fifth aspects of the present invention, it is possible to adjust the output level from the microphone to the monitor speaker and to adjust the frequency, so that the noise reduction effect can be maximized according to the situation.
According to the sixth aspect of the invention, it is possible to provide an image forming apparatus with high added value.
[Brief description of the drawings]
FIG. 1 is a mechanism diagram of a facsimile apparatus according to an embodiment of the present invention.
FIG. 2 is a functional block diagram of the facsimile apparatus according to the embodiment of the present invention.
[Explanation of symbols]
19 microphone 20 DSP (out-of-phase generation circuit)
21. Frequency filter (component of anti-phase generation circuit)
22 speakers (monitor speakers)
23 volumes

Claims (6)

機器の状態を音で伝えるために機器内部に設けられたモニタースピーカと、モニタースピーカに並列に接続されたマイクと、マイクからの入力信号を逆位相の信号に変換する逆位相生成回路とを備えたことを特徴とする静音化装置。A monitor speaker provided inside the device for transmitting the state of the device by sound, a microphone connected in parallel with the monitor speaker, and an anti-phase generation circuit for converting an input signal from the microphone to a signal of an opposite phase are provided. A noise reduction device characterized by that: 請求項１記載の静音化装置において、前記マイクからのモニタースピーカへの出力レベル調整、周波数調整が可能であることを特徴とする静音化装置。2. The noise reduction device according to claim 1, wherein an output level from the microphone to a monitor speaker and a frequency can be adjusted. 請求項２記載の静音化装置において、前記マイクからのモニタースピーカへの出力レベル調整、周波数調整を行うボリュームを備えたことを特徴とする静音化装置。3. The noise reduction device according to claim 2, further comprising a volume for adjusting an output level from the microphone to a monitor speaker and adjusting a frequency. 請求項２記載の静音化装置において、前記マイクからのモニタースピーカへの出力レベル調整、周波数調整を行う操作手段を備えたことを特徴とする静音化装置。3. The noise reduction device according to claim 2, further comprising operation means for adjusting an output level from the microphone to a monitor speaker and frequency adjustment. 請求項２記載の静音化装置において、前記マイクからのモニタースピーカへの出力信号を特定の周波数に限定したことを特徴とする静音化装置。3. The noise reduction device according to claim 2, wherein an output signal from the microphone to a monitor speaker is limited to a specific frequency. 請求項１記載の静音化装置において、対象となる機器はファクシミリ装置、複合機を含む画像形成装置であることを特徴とする静音化装置。2. The noise reduction device according to claim 1, wherein the target device is an image forming device including a facsimile device and a multifunction peripheral.
JP2003154911A 2003-05-30 2003-05-30 Noise reduction apparatus Pending JP2004354886A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10499794B2 (en) 2013-05-09 2019-12-10 Endochoice, Inc. Operational interface in a multi-viewing element endoscope
US10905315B2 (en) 2013-03-28 2021-02-02 Endochoice, Inc. Manifold for a multiple viewing elements endoscope

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04204894A (en) * 1990-11-30 1992-07-27 Matsushita Electric Works Ltd Broadcasting system
JPH0830902A (en) * 1994-07-14 1996-02-02 Sony Corp Noise reduction device for camcorder
JPH08314474A (en) * 1995-05-17 1996-11-29 Yanmar Diesel Engine Co Ltd Active muffler
JPH1097262A (en) * 1996-09-20 1998-04-14 Fujitsu General Ltd Fan rotation sound removing device
JPH10126893A (en) * 1996-10-18 1998-05-15 Matsushita Electric Ind Co Ltd Haring aid

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04204894A (en) * 1990-11-30 1992-07-27 Matsushita Electric Works Ltd Broadcasting system
JPH0830902A (en) * 1994-07-14 1996-02-02 Sony Corp Noise reduction device for camcorder
JPH08314474A (en) * 1995-05-17 1996-11-29 Yanmar Diesel Engine Co Ltd Active muffler
JPH1097262A (en) * 1996-09-20 1998-04-14 Fujitsu General Ltd Fan rotation sound removing device
JPH10126893A (en) * 1996-10-18 1998-05-15 Matsushita Electric Ind Co Ltd Haring aid

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10905315B2 (en) 2013-03-28 2021-02-02 Endochoice, Inc. Manifold for a multiple viewing elements endoscope
US10499794B2 (en) 2013-05-09 2019-12-10 Endochoice, Inc. Operational interface in a multi-viewing element endoscope

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