JP6964581B2 - 固定応答フィルタによって部分的に提供されるフィードバック応答を有するフィードバック適応雑音消去(anc)コントローラおよび方法 - Google Patents
固定応答フィルタによって部分的に提供されるフィードバック応答を有するフィードバック適応雑音消去(anc)コントローラおよび方法 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
- G10K11/1781—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
- G10K11/17815—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 reference signals and the error signals, i.e. primary path
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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
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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
- G10K11/17813—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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- 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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- G10K11/00—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
- G10K11/17853—Methods, e.g. algorithms; Devices of the filter
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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
- G10K11/17857—Geometric disposition, e.g. placement of microphones
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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
- G10K11/17879—General system configurations using both a reference signal and an error signal
- G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
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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
- G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
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- G—PHYSICS
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- 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
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
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- 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
- G10K2210/30—Means
- G10K2210/301—Computational
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- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
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- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
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- G10K2210/301—Computational
- G10K2210/3027—Feedforward
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- G—PHYSICS
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- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
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- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
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Description
本発明は、例えば、以下を提供する。
(項目1)
適応雑音消去(ANC)コントローラであって、
所定の固定伝達関数(B(z))を有する固定フィルタであって、前記所定の固定伝達関数は、補償されたフィードバックループの安定性に関連しており、かつそれを維持し、前記固定フィルタは、ANCシステムのANC利得に寄与する、固定フィルタと、
前記固定フィルタに結合される可変応答フィルタであって、前記可変応答フィルタの応答は、前記ANC利得が二次経路の伝達関数における変動から独立するように、少なくとも前記ANCシステムの変換器から前記ANCシステムのセンサまでの経路を含む前記二次経路の伝達関数の変動を補償する、可変応答フィルタと
を備える、ANCコントローラ。
(項目2)
前記固定フィルタは、前記ANC利得を前記所定の固定伝達関数に依存する均一フィードバック利得にさせる、項目1に記載のANCコントローラ。
(項目3)
前記可変応答フィルタの応答は、前記二次経路の伝達関数の逆数である、項目1に記載のANCコントローラ。
(項目4)
前記可変応答フィルタの応答は、前記ANCシステムの適応フィルタの制御出力と一致するように制御される、項目3に記載のANCコントローラ。
(項目5)
前記可変応答フィルタは、前記適応フィルタであり、それによって、前記可変応答フィルタの応答は、前記可変応答フィルタの応答が適用される前記可変応答フィルタへの入力として提供される信号の周波数成分に依存する、項目4に記載のANCコントローラ。
(項目6)
前記適応フィルタは、前記ANCシステムの変換器によって再現された信号の成分に及ぼす前記二次経路の影響を消去するように適応する、前記ANCシステムのフィードフォワード部分の適応フィルタである、項目4に記載のANCコントローラ。
(項目7)
前記センサは、マイクロホンであり、前記変換器は、スピーカである、項目1に記載のANCコントローラ。
(項目8)
音響雑音消去を含むオーディオデバイスの少なくとも一部を実装する集積回路(IC)であって、前記集積回路は、
変換器の音響出力内の周囲オーディオ音の影響を抑制するための反雑音信号を含む出力信号を出力変換器に提供するための出力と、
少なくとも1つのマイクロホン信号を受信するための少なくとも1つのマイクロホン入力であって、前記少なくとも1つのマイクロホン入力は、前記周囲オーディオ音を示し、前記変換器の音響出力に起因する成分を含有する、少なくとも1つのマイクロホン入力と、
前記反雑音信号を適応的に発生させ、聴取者に聞こえる前記周囲オーディオ音の存在を低減させる処理回路であって、前記処理回路は、前記少なくとも1つのマイクロホン信号からの反雑音信号の少なくとも一部を発生させる応答を有するフィードバックフィルタを実装し、前記フィードバックフィルタは、所定の固定伝達関数(B(z))を有する固定フィルタと、前記固定フィルタに結合される可変応答フィルタとを備え、前記可変応答フィルタの応答は、少なくとも前記変換器から前記少なくとも1つのマイクロホンまでの経路を含む二次経路の伝達関数の変動を補償する、処理回路と
を備える、集積回路。
(項目9)
前記固定フィルタは、前記フィードバックフィルタ、前記変換器、前記少なくとも1つのマイクロホン、および前記二次経路によって形成されるシステムのANC利得を前記所定の固定伝達関数に依存する均一フィードバック利得にさせる、項目8に記載の集積回路。
(項目10)
前記可変応答フィルタの応答は、前記二次経路の伝達関数の逆数である、項目8に記載の集積回路。
(項目11)
前記可変応答フィルタの応答は、前記二次経路をモデル化する前記処理回路によって実装される適応フィルタの制御出力と一致するように制御される、項目10に記載の集積回路。
(項目12)
前記可変応答フィルタは、前記適応フィルタであり、それによって、前記可変応答フィルタの応答は、前記可変応答フィルタの応答が適用される前記可変応答フィルタへの入力として提供される信号の周波数成分に依存する、項目11に記載の集積回路。
(項目13)
前記処理回路はさらに、前記反雑音信号の別の部分を発生させるフィードフォワード適応フィルタを実装し、さらに、前記ANCシステムの変換器によって再現されたソースオーディオ信号の成分に及ぼす前記二次経路の影響を消去するように適応する二次経路適応フィルタを実装する、項目11に記載の集積回路。
(項目14)
周囲雑音の影響を消去する方法であって、前記方法は、
反雑音信号を適応的に発生させ、前記周囲雑音の存在を低減させることと、
前記結合の結果を変換器に提供することと、
少なくとも1つのセンサを用いて周囲雑音を測定することと、
固定フィルタと、前記固定フィルタに結合される可変応答フィルタとを用いて、前記少なくとも1つのセンサの出力をフィルタ処理することであって、前記固定フィルタは、所定の固定伝達関数(B(z))を有し、前記所定の固定伝達関数は、補償されたフィードバックループの安定性に関連しており、かつそれを維持し、前記固定フィルタは、ANCシステムのANC利得に寄与し、前記可変応答フィルタの応答は、前記ANC利得が前記二次経路の伝達関数における変動から独立するように、少なくとも前記ANCシステムの変換器から前記ANCシステムのセンサまでの経路を含む二次経路の伝達関数の変動を補償する、ことと
を含む、方法。
(項目15)
前記フィルタ処理することは、前記ANC利得を前記所定の固定伝達関数に依存する均一フィードバック利得にさせる、項目14に記載の方法。
(項目16)
前記可変応答フィルタの応答は、前記二次経路の伝達関数の逆数である、項目14に記載の方法。
(項目17)
前記可変応答フィルタの応答を前記ANCシステムの適応フィルタの制御出力と一致するように制御することをさらに含む、項目16に記載の方法。
(項目18)
前記可変応答フィルタは、前記適応フィルタであり、前記可変応答フィルタの応答は、前記可変応答フィルタの応答が適用される前記可変応答フィルタへの入力として提供される信号の周波数成分に依存して制御される、項目17に記載の方法。
(項目19)
前記適応フィルタは、前記ANCシステムの変換器によって再現された信号の成分に及ぼす前記二次経路の影響を消去するように適応する、前記ANCシステムのフィードフォワード部分の適応フィルタである、項目17に記載の方法。
(項目20)
前記センサは、マイクロホンであり、前記変換器は、スピーカである、項目14に記載の方法。
Claims (14)
- 適応雑音消去(ANC)コントローラであって、
所定の固定伝達関数(B(z))を有する固定フィルタであって、前記所定の固定伝達関数は、ANCシステムのセンサによって測定された周囲雑音と前記ANCシステムの変換器によって提供される反雑音信号との間の位相マージンおよび利得マージンを維持することによって、補償されたフィードバックループの安定性に関連し、かつ、それを維持し、前記ANCシステムは、前記所定の固定伝達関数に依存するANC利得を有する、固定フィルタと、
前記固定フィルタに結合されている可変応答フィルタであって、前記可変応答フィルタの応答は、前記ANC利得が少なくとも前記変換器から前記センサまでの経路を含む二次経路の伝達関数における変動から独立であるように、前記二次経路の伝達関数の変動を補償し、前記可変応答フィルタの応答は、前記二次経路の伝達関数の逆数である、可変応答フィルタと
を備える、ANCコントローラ。 - 前記可変応答フィルタの応答は、前記ANCコントローラによって制御され、かつ、前記ANCシステムの適応フィルタの出力に基づく、請求項1に記載のANCコントローラ。
- 前記可変応答フィルタは、前記適応フィルタであり、これにより、前記可変応答フィルタの応答は、前記可変応答フィルタの応答が適用される前記可変応答フィルタへの入力として提供される信号の周波数成分に依存する、請求項2に記載のANCコントローラ。
- 前記適応フィルタは、前記ANCシステムのフィードフォワード部分の適応フィルタであり、前記ANCシステムの前記フィードフォワード部分の前記適応フィルタは、前記ANCシステムの前記変換器によって再現された信号の成分に及ぼす前記二次経路の影響を最小二乗平均に基づいて最小化するように適応する、請求項2に記載のANCコントローラ。
- 前記センサは、マイクロホンであり、前記変換器は、スピーカである、請求項1に記載のANCコントローラ。
- 音響雑音消去を含むオーディオデバイスの少なくとも一部を実装する集積回路(IC)であって、前記集積回路は、
出力信号を変換器に提供するための出力であって、前記出力信号は、前記変換器の音響出力内の周囲オーディオ音の影響を抑制するための反雑音信号を含む、出力と、
少なくとも1つのマイクロホンから少なくとも1つのマイクロホン信号を受信するための少なくとも1つのマイクロホン入力であって、前記少なくとも1つのマイクロホン信号は、前記周囲オーディオ音を示し、かつ、前記変換器の音響出力に起因する成分を含有する、少なくとも1つのマイクロホン入力と、
前記反雑音信号を適応的に生成し、前記反雑音信号を前記変換器に提供することにより、聴取者に聞こえる前記周囲オーディオ音の存在を低減する処理回路であって、前記処理回路は、前記少なくとも1つのマイクロホン信号から前記変換器に提供される前記反雑音信号の少なくとも第1の部分を生成する応答を有するフィードバックフィルタを実装し、前記フィードバックフィルタは、所定の固定伝達関数(B(z))を有する固定フィルタと、前記固定フィルタに結合されている可変応答フィルタとを備え、前記所定の固定伝達関数は、前記少なくとも1つのマイクロホンからの前記少なくとも1つのマイクロホン信号と前記変換器に提供される前記反雑音信号との間の位相マージンおよび利得マージンを維持することによって、補償されたフィードバックループの安定性に関連し、かつ、それを維持し、前記フィードバックフィルタおよび前記変換器および前記少なくとも1つのマイクロホンおよび少なくとも前記変換器から前記少なくとも1つのマイクロホンまでの経路を含む二次経路によって形成される適応雑音消去(ANC)システムは、前記所定の固定伝達関数に依存するANC利得を有し、前記可変応答フィルタの応答は、前記ANC利得が前記二次経路の伝達関数の変動から独立であるように、前記二次経路の伝達関数の変動を補償し、前記可変応答フィルタの応答は、前記二次経路の伝達関数の逆数である、処理回路と
を備える、集積回路。 - 前記可変応答フィルタの応答は、前記処理回路によって制御され、かつ、前記処理回路によって実装される適応フィルタの出力に基づく、請求項6に記載の集積回路。
- 前記可変応答フィルタは、前記適応フィルタであり、これにより、前記可変応答フィルタの応答は、前記可変応答フィルタの応答が適用される前記可変応答フィルタへの入力として提供される信号の周波数成分に依存する、請求項7に記載の集積回路。
- 前記処理回路は、前記変換器に提供される前記反雑音信号の第2の部分を生成するフィードフォワード適応フィルタをさらに実装し、前記変換器に提供される前記反雑音信号の前記第2の部分は、前記変換器に提供される前記反雑音信号の前記少なくとも第1の部分とは異なり、前記処理回路は、前記ANCシステムの変換器によって再現されたソースオーディオ信号の成分に及ぼす前記二次経路の影響を最小二乗平均に基づいて最小化するように適応する二次経路適応フィルタをさらに実装する、請求項7に記載の集積回路。
- 周囲雑音の影響を消去する方法であって、前記方法は、
反雑音信号を適応的に生成することにより、前記周囲雑音の存在を低減することと、
前記反雑音信号を適応雑音消去(ANC)システムの変換器に提供することと、
前記ANCシステムのセンサを用いて前記周囲雑音を測定することと、
固定フィルタと、前記固定フィルタに結合されている可変応答フィルタとを用いて、前記センサの出力をフィルタ処理することであって、前記固定フィルタは、所定の固定伝達関数(B(z))を有し、前記所定の固定伝達関数は、前記センサによって測定された前記周囲雑音と、前記変換器によって提供される反雑音信号との間の位相マージンおよび利得マージンを維持することによって、補償されたフィードバックループの安定性に関連し、かつ、それを維持し、前記ANCシステムは、前記所定の固定伝達関数に依存するANC利得を有し、前記可変応答フィルタの応答は、前記ANC利得が少なくとも前記変換器から前記センサまでの経路を含む二次経路の伝達関数における変動から独立であるように、前記二次経路の伝達関数の変動を補償し、前記可変応答フィルタの応答は、前記二次経路の伝達関数の逆数である、ことと
を含む、方法。 - 前記ANCシステムの適応フィルタの出力に基づいて、前記可変応答フィルタの応答を制御することをさらに含む、請求項10に記載の方法。
- 前記可変応答フィルタは、前記適応フィルタであり、前記可変応答フィルタの応答は、前記可変応答フィルタの応答が適用される前記可変応答フィルタへの入力として提供される信号の周波数成分に依存して制御される、請求項11に記載の方法。
- 前記適応フィルタは、前記ANCシステムのフィードフォワード部分の適応フィルタであり、前記ANCシステムの前記フィードフォワード部分の前記適応フィルタは、前記ANCシステムの前記変換器によって再現された信号の成分に及ぼす前記二次経路の影響を最小二乗平均に基づいて最小化するように適応する、請求項11に記載の方法。
- 前記センサは、マイクロホンであり、前記変換器は、スピーカである、請求項10に記載の方法。
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