JP7292796B2 - 能動型騒音制御システム - Google Patents
能動型騒音制御システム Download PDFInfo
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- 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
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- 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
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- 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
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- 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
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- G10K11/1785—Methods, e.g. algorithms; Devices
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- 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
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- 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
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- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
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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
- G10K11/1781—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
- G10K11/17813—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 acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
- G10K11/17817—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 acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the output signals and the error signals, i.e. secondary path
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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
- G10K11/1787—General system configurations
- G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure feedback
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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
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/102—Two dimensional
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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
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
- G10K2210/1081—Earphones, e.g. for telephones, ear protectors or headsets
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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
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/128—Vehicles
- G10K2210/1282—Automobiles
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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
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/301—Computational
- G10K2210/3019—Cross-terms between multiple in's and out's
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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
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/301—Computational
- G10K2210/3026—Feedback
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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
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/301—Computational
- G10K2210/3046—Multiple acoustic inputs, multiple acoustic outputs
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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
- 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
- G10K2210/3214—Architectures, e.g. special constructional features or arrangements of features
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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
- 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
- G10K2210/3219—Geometry of the configuration
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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
- 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
- G10K2210/3221—Headrests, seats or the like, for personal ANC systems
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Description
図1に、本実施形態に係る能動型騒音制御システムの構成を示す。
図示するように能動型騒音制御システム1は、信号処理ブロック11、第1スピーカ12、第1マイク13、第2スピーカ14、第2マイク15を備えている。
そして、能動型騒音制御システム1は、自動車に搭載されるシステムであり、自動車の所定の座席に搭乗したユーザの右耳の位置を第1キャンセルポイント、ユーザの左耳の位置を第2キャンセルポイントとして、2つのキャンセルポイントのそれぞれにおいて騒音源2の発生する騒音をキャンセルするシステムである。
信号処理ブロック11は、主として、第1キャンセル信号CA1(n)の生成に関わる処理を行う第1信号処理部111と、主として、第2キャンセル信号CA2(n)の生成に関わる処理を行う第2信号処理部112とを備えている。
また、第1信号処理部111の第1系補助フィルタ1111に設定されている伝達関数H1(z)と、第2信号処理部112の第2系補助フィルタ1121に設定されている伝達関数H2(z)は、予め学習して設定した伝達関数であり、学習時の環境下において、第1キャンセルポイントと第2キャンセルポイントに学習用のマイクを配置して求めた、第1キャンセルポイントと第2キャンセルポイントで各騒音がキャンセルされる伝達関数に、第1系可変フィルタ1112と第2系可変フィルタ1122の伝達関数を固定した状態で求めた、第1系減算器1116が出力するエラーe1と第2系減算器1126が出力するエラーe2が0となる伝達関数H1(z)、伝達関数H2(z)が設定されている。
なお、第1系可変フィルタ1112と第2系可変フィルタ1122の第1キャンセルポイントと第2キャンセルポイントで各騒音がキャンセルされる伝達関数は、環境の変化により、学習時の環境下のものから変化し、この変化を、第1系可変フィルタ1112と第2系可変フィルタ1122の伝達関数に反映するのが上述したNLMSなどの適応アルゴリズムによる伝達関数の更新である。
ここで、以上の実施形態における、第1スピーカ12と第2スピーカ14の第1キャンセルポイントと第2キャンセルポイントを結ぶ線分の方向についての位置は、必ずしも厳密に、第1キャンセルポイントと第2キャンセルポイントの中点と同じ位置としなくてもよく、前記線分の方向についての第1スピーカ12と第2スピーカ14の位置は、前記線分の方向についての位置が前記第1キャンセルポイントと前記第2キャンセルポイントの間の任意の位置としてもよく、このようにしても、ある程度の効果を見込むことができる。
Claims (4)
- 騒音を低減する能動型騒音制御システムであって、
第1キャンセル音を出力する第1スピーカと、
第2キャンセル音を出力する第2スピーカと、
前記第1スピーカから出力する第1キャンセル音と、前記第2スピーカから第2キャンセル音とを、予め設定した第1キャンセルポイントにおいて騒音がキャンセルされ、かつ、予め設定した第2キャンセルポイントにおいて騒音がキャンセルされるように生成するキャンセル音生成手段とを有し、
前記第1スピーカと第2スピーカは、前記第1キャンセルポイントと前記第2キャンセルポイントを結ぶ線分と垂直な方向に並べて、前記線分の方向についての位置が前記第1キャンセルポイントと前記第2キャンセルポイントの中点と同じ位置となるように配置されており、
前記第1キャンセルポイントと前記第2キャンセルポイントは、所定の座席に着座した人間の左耳が標準的に位置するポイントと、前記人間の右耳が標準的に位置するポイントであることを特徴とする能動型騒音制御システム。 - 請求項1記載の能動型騒音制御システムであって、
前記所定の座席は、自動車の座席であり、
前記第1スピーカと第2スピーカとは、前記自動車の前記座席の前方の天井に当該自動車の前後方向に並べて配置されていることを特徴とする能動型騒音制御システム。 - 請求項1または2記載の能動型騒音制御システムであって、
前記キャンセル音生成手段は、第1マイクと、第2マイクと、前記騒音を表す騒音信号を入力し前記第1キャンセル音を生成する第1適応フィルタと、前記騒音を表す騒音信号を入力し前記第2キャンセル音を生成する第2適応フィルタとを有し、
前記第1適応フィルタと前記第2適応フィルタは、第1マイクと第2マイクからの入力音を用いて、前記第1スピーカから出力する第1キャンセル音と前記第2スピーカから第2キャンセル音として、第1キャンセルポイントにおいて騒音がキャンセルされ、かつ、第2キャンセルポイントにおいて騒音がキャンセルされるように、自身の伝達関数を適応させることを特徴とする能動型騒音制御システム。 - 請求項3記載の能動型騒音制御システムであって、
前記キャンセル音生成手段は、第1補助フィルタと第2補助フィルタとを備え、前記第1適応フィルタと前記第2適応フィルタは、前記第1マイクからの入力音と第1補助フィルタの出力の差と、前記第2マイクからの入力音と第2補助フィルタの出力の差をエラーとして、所定の適応アルゴリズムによって自身の伝達関数を更新し、
前記第1補助フィルタと前記第2補助フィルタには、第1キャンセルポイントと第2キャンセルポイントで騒音がキャンセルされる伝達関数が第1適応フィルタと第2適応フィルタに設定されているときに、前記第1マイクからの入力音と当該第1補助フィルタの出力の差が無くなると共に、前記第2マイクからの入力音と当該第2補助フィルタの出力の差が無くなる伝達関数として学習された伝達関数が設定されていることを特徴とする能動型騒音制御システム。
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JP2019096400A JP7292796B2 (ja) | 2019-05-22 | 2019-05-22 | 能動型騒音制御システム |
EP20175752.3A EP3742434B1 (en) | 2019-05-22 | 2020-05-20 | Active noise control system |
CN202010434939.4A CN111986643A (zh) | 2019-05-22 | 2020-05-21 | 主动型噪声控制系统 |
US16/880,170 US11501748B2 (en) | 2019-05-22 | 2020-05-21 | Active noise control system |
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JP7292796B2 true JP7292796B2 (ja) | 2023-06-19 |
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JP2018072770A (ja) | 2016-11-04 | 2018-05-10 | 株式会社ヤクルト本社 | アクティブ消音装置および消音システム |
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JPH03203490A (ja) * | 1989-12-29 | 1991-09-05 | Nissan Motor Co Ltd | 能動型騒音制御装置 |
JPH05249986A (ja) * | 1992-03-09 | 1993-09-28 | Isuzu Motors Ltd | 車室内騒音の低減装置 |
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