JP6823657B2 - フィルタ処理された誤差マイクロフォン信号を有するハイブリッド適応ノイズ消去システム - Google Patents
フィルタ処理された誤差マイクロフォン信号を有するハイブリッド適応ノイズ消去システム Download PDFInfo
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- JP6823657B2 JP6823657B2 JP2018528213A JP2018528213A JP6823657B2 JP 6823657 B2 JP6823657 B2 JP 6823657B2 JP 2018528213 A JP2018528213 A JP 2018528213A JP 2018528213 A JP2018528213 A JP 2018528213A JP 6823657 B2 JP6823657 B2 JP 6823657B2
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- path estimation
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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
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- 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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- Engineering & Computer Science (AREA)
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- Health & Medical Sciences (AREA)
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- Audiology, Speech & Language Pathology (AREA)
- Signal Processing (AREA)
- Otolaryngology (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Circuit For Audible Band Transducer (AREA)
Description
と定義される二次指数性能指数(SEPI)を計算することができ、ここで、kは二次経路推定適応フィルタ34Aの第1の係数のタップを表し、nは二次経路推定適応フィルタ34Aの第2の係数のタップを表す。いくつかの実施形態では、係数のタップは、二次経路推定適応フィルタ34Aを実装する有限インパルス応答フィルタの最長の遅延要素を表す係数タップを含むであろう。例えば、256係数のフィルタでは、kは128に等しくてもよく、nは256に等しくてもよい。一旦、計算されると、二次経路推定適応フィルタ34Aがソースオーディオ信号の電気音響経路を十分にモデル化しているかどうかを決定するために、SEPIの値は1つまたは複数の閾値と比較され得る。SEPIの値がこのような閾値より小さい場合は、二次経路推定適応フィルタ34Aはソースオーディオ信号の電気音響経路を十分にモデル化しているものと決定され得る。
の式で得ることができる。したがって、二次応答SE(z)が実際の二次応答S(z)をぴったりと追従するのであれば、修正されたソースオーディオ信号は修正されないソースオーディオ信号にほぼ等しくなる。
例えば、前述の式のような応答を有するフィルタを実装するため、式の右側の項の周波数応答を直接用いて有限インパルス応答フィルタを構築してもよい。別の例として、いくつかの有限インパルス応答および/または無限インパルス応答ブロックを使用してこのような応答を有するフィルタを構築してもよい。
Claims (32)
- パーソナルオーディオデバイスの少なくとも一部分を実装するための集積回路であって、
聞き手への再生のためのソースオーディオ信号と、トランスデューサの音響出力内の周囲のオーディオ音の影響を打ち消すためのアンチノイズ信号との両方を含む信号を、前記トランスデューサに提供するための出力と、
前記周囲のオーディオ音を示す参照マイクロフォン信号を受信するための参照マイクロフォン入力と、
前記トランスデューサの前記出力と、前記トランスデューサにおける前記周囲のオーディオ音とを示す誤差マイクロフォン信号を受信するための誤差マイクロフォン入力と、
処理回路であって、
前記参照マイクロフォン信号から前記アンチノイズ信号の少なくとも一部を生成する応答を有するフィードフォワードフィルタと、
前記ソースオーディオ信号の電気音響経路をモデル化し、前記ソースオーディオ信号から二次経路推定を生成する応答を有する、ように構成された二次経路推定フィルタと、
前記誤差マイクロフォン信号に基づいて前記アンチノイズ信号の少なくとも一部を生成する応答を有するフィードバックフィルタと、
前記誤差マイクロフォン信号と前記二次経路推定との差異に基づく再生補正エラーを含むミスアライメント修正信号を生成することによって、前記参照マイクロフォン信号と誤差マイクロフォン信号とのミスアライメントを修正するように構成されたアライメントフィルタと、
前記誤差マイクロフォン信号内の前記周囲のオーディオ音を最小化するように前記フィードフォワードフィルタの前記応答を適応させることによって、前記フィードフォワードフィルタの前記応答を形作るフィードフォワード係数制御ブロックと、
前記ミスアライメント修正信号を最小化するために、前記ソースオーディオ信号と前記ミスアライメント修正信号とに合わせて前記二次経路推定フィルタの前記応答を形作る二次経路係数制御ブロックと、
を実装する処理回路と、
を備える、集積回路。 - 前記フィードバックフィルタの前記応答が、前記誤差マイクロフォン信号と前記二次経路推定との差異に基づく前記再生補正エラーから、前記アンチノイズ信号の少なくとも一部を生成する、請求項1に記載の集積回路。
- 前記ミスアライメント修正信号が、前記再生補正エラーから生成された、フィルタ処理された再生補正エラーを含む、請求項2に記載の集積回路。
- 前記フィードフォワード係数制御ブロックが、前記フィルタ処理された再生補正エラーと前記参照マイクロフォン信号とに合わせて前記フィードフォワードフィルタの前記応答を形作る、請求項3に記載の集積回路。
- 前記アライメントフィルタが、SE(z)が前記二次経路推定フィルタの前記応答であり、H(z)が前記フィードバックフィルタの前記応答であるときに、1+SE(z)H(z)で得られる応答を有する、請求項1に記載の集積回路。
- 前記処理回路が、前記フィードバックフィルタに関連したゲインをさらに実装する、請求項1に記載の集積回路。
- 前記処理回路が、前記電気音響経路をモデル化する際の前記二次経路推定フィルタの性能をモニタするための二次経路推定性能モニタをさらに実装する、請求項6に記載の集積回路。
- 前記処理回路が、前記二次経路推定性能モニタに応答して前記ゲインを制御する、請求項7に記載の集積回路。
- 前記アライメントフィルタが、SE(z)が前記二次経路推定フィルタの前記応答であり、H(z)が前記フィードバックフィルタの前記応答であり、Gが前記ゲインであるときに、1+SE(z)H(z)Gによって得られる応答を有する、請求項8に記載の集積回路。
- 前記アライメントフィルタが、SEG(z)が、前記二次経路推定性能モニタによって決定されるように、前記二次経路推定フィルタが前記ソースオーディオ信号の前記電気音響経路を十分にモデル化していた時点で存在する前記二次経路推定フィルタの前もって記憶された応答であり、H(z)が前記フィードバックフィルタの前記応答であり、Gが前記ゲインであるときに、1+SEG(z)H(z)Gで得られる応答を有する、請求項8に記載の集積回路。
- 前記二次経路推定性能モニタが、前記二次経路推定フィルタが前記ソースオーディオ信号の前記電気音響経路を、その度合いに依存して十分にモデル化している更新頻度で前記記憶された応答SEG(z)を更新する、請求項10に記載の集積回路。
- 前記フィードフォワード係数制御ブロックに伝達されるフィルタ処理された参照マイクロフォン信号を生成するために、SEG(z)に実質的に等価な応答を有するフィルタが前記参照マイクロフォン信号に適用される、請求項10に記載の集積回路。
- 前記二次経路係数制御ブロックが、前記ミスアライメント修正信号を最小化するために前記ミスアライメント修正信号と修正されたソースオーディオ信号とを相関させることによって前記二次経路推定フィルタの前記応答を形作り、前記修正されたソースオーディオ信号が、前記ソースオーディオ信号と前記フィードバックフィルタによって生成された前記アンチノイズ信号の一部との合計を含む、請求項1に記載の集積回路。
- パーソナルオーディオデバイスのトランスデューサ付近の周囲のオーディオ音を消去するための方法であって、
前記周囲のオーディオ音を示す参照マイクロフォン信号を受信することと、
前記トランスデューサの出力と、前記トランスデューサにおける前記周囲のオーディオ音とを示す誤差マイクロフォン信号を受信することと、
聞き手への再生のためのソースオーディオ信号を生成することと、
前記誤差マイクロフォン信号内の前記周囲のオーディオ音を最小化するために前記参照マイクロフォン信号をフィルタ処理する適応フィルタの応答を適応させることによって、前記参照マイクロフォン信号からフィードフォワードアンチノイズ信号の成分を生成することと、
前記トランスデューサの音響出力における周囲のオーディオ音の影響を打ち消すために前記誤差マイクロフォン信号に基づいてフィードバックアンチノイズ信号の成分を生成することと、
前記参照マイクロフォン信号と誤差マイクロフォン信号とのミスアライメントを修正するために、前記誤差マイクロフォン信号と二次経路推定との差異に基づく再生補正エラーを含むミスアライメント修正信号を生成することと、
前記再生補正エラーを最小化するために、前記ソースオーディオ信号の電気音響経路をモデル化し、前記ソースオーディオ信号をフィルタ処理する二次経路推定フィルタの応答を適応させることによって、前記ソースオーディオ信号から前記二次経路推定を生成することと、
前記トランスデューサに提供されるオーディオ信号を生成するために、前記フィードフォワードアンチノイズ信号の成分と前記フィードバックアンチノイズ信号の成分とをソースオーディオ信号と組み合わせることと、
を含む、方法。 - 前記フィードバックアンチノイズ信号の成分を生成することが、前記誤差マイクロフォン信号と二次経路推定との差異に基づく再生補正エラーをフィードバックフィルタでフィルタ処理することを含む、請求項14に記載の方法。
- 前記ミスアライメント修正信号を生成することが、前記再生補正エラーからフィルタ処理された再生補正エラーを生成することを含む、請求項15に記載の方法。
- 前記参照マイクロフォン信号をフィルタ処理する適応フィルタの前記応答を適応させることが、前記フィルタ処理された再生補正エラーと前記参照マイクロフォン信号とに合わせて前記適応フィルタの前記応答を形作ることを含む、請求項16に記載の方法。
- 前記ミスアライメント修正信号を生成するアライメントフィルタが、SE(z)が前記二次経路推定フィルタの応答であり、H(z)が前記誤差マイクロフォン信号に基づいて前記フィードバックアンチノイズ信号の成分を生成するフィードバックフィルタの応答であるときに、1+SE(z)H(z)によって得られる応答を有する、請求項14に記載の方法。
- 前記誤差マイクロフォン信号に基づいて前記フィードバックアンチノイズ信号の成分を生成するフィードバックフィルタに関連するゲインを適用することをさらに含む、請求項14に記載の方法。
- 前記電気音響経路をモデル化する際の前記二次経路推定フィルタの性能をモニタするための二次経路推定性能モニタによりモニタすることをさらに含む、請求項19に記載の方法。
- 前記二次経路推定性能モニタに応答してゲイン要素のゲインを制御することをさらに含む、請求項20に記載の方法。
- 前記ミスアライメント修正信号を生成するアライメントフィルタが、SE(z)が前記二次経路推定フィルタの応答であり、H(z)が前記フィードバックフィルタの前記応答であり、Gがゲインであるときに、1+SE(z)H(z)Gによって得られる応答を有する、請求項20に記載の方法。
- 前記ミスアライメント修正信号を生成するアライメントフィルタが、SEG(z)が、前記二次経路推定性能モニタによって決定されるように、前記二次経路推定フィルタが前記ソースオーディオ信号の前記電気音響経路を十分にモデル化していた時点で存在する前記二次経路推定フィルタの前もって記憶された応答であり、H(z)が前記フィードバックフィルタの前記応答であり、Gが前記ゲインであるときに、1+SEG(z)H(z)Gで得られる応答を有する、請求項20に記載の方法。
- 前記二次経路推定フィルタが前記ソースオーディオ信号の前記電気音響経路を、その度合いに依存して十分にモデル化している更新頻度で前記記憶された応答SEG(z)を更新することをさらに含む、請求項23に記載の方法。
- 前記参照マイクロフォン信号から前記フィードフォワードアンチノイズ信号の成分を生成するフィードフォワード係数制御ブロックに伝達されるフィルタ処理された参照マイクロフォン信号を生成するために、SEG(z)に実質的に等価な応答を有するフィルタを前記参照マイクロフォン信号に適用することをさらに含む、請求項23に記載の方法。
- 前記ソースオーディオ信号から前記二次経路推定を生成する二次経路係数制御ブロックが、前記ミスアライメント修正信号を最小化するために前記ミスアライメント修正信号と修正されたソースオーディオ信号とを相関させることによって前記二次経路推定フィルタの前記応答を形作り、前記修正されたソースオーディオ信号が、前記ソースオーディオ信号と前記誤差マイクロフォン信号に基づいて前記フィードバックアンチノイズ信号の成分を生成するフィードバックフィルタによって生成されたアンチノイズ信号の一部との合計を含む、請求項14に記載の方法。
- パーソナルオーディオデバイスの少なくとも一部分を実装するための集積回路であって、
聞き手への再生のためのソースオーディオ信号と、トランスデューサの音響出力内の周囲のオーディオ音の影響を打ち消すためのアンチノイズ信号との両方を含む信号を、前記トランスデューサに提供するための出力と、
前記周囲のオーディオ音を示す参照マイクロフォン信号を受信するための参照マイクロフォン入力と、
前記トランスデューサの前記出力と、前記トランスデューサにおける前記周囲のオーディオ音とを示す誤差マイクロフォン信号を受信するための誤差マイクロフォン入力と、
注入された実質的に不可聴のノイズ信号を受信するためのノイズ入力と、
処理回路であって、
前記参照マイクロフォン信号から前記アンチノイズ信号の少なくとも一部を生成する応答を有するフィードフォワードフィルタと、
前記ソースオーディオ信号の電気音響経路をモデル化し、前記ソースオーディオ信号から二次経路推定を生成する応答を有する、ように構成された二次経路推定フィルタと、
前記誤差マイクロフォン信号に基づいて前記アンチノイズ信号の少なくとも一部を生成する応答を有するフィードバックフィルタと、
前記アンチノイズ信号の電気音響経路をモデル化し、前記ノイズ信号からフィルタ処理されたノイズ信号を生成する応答を有する、ように構成された有効二次推定フィルタと、
前記誤差マイクロフォン信号内の前記周囲のオーディオ音を最小化するように前記フィードフォワードフィルタの前記応答を適応させることによって、前記誤差マイクロフォン信号と前記参照マイクロフォン信号とに合わせて前記フィードフォワードフィルタの前記応答を形作るフィードフォワード係数制御ブロックと、
前記誤差マイクロフォン信号を最小化するために前記ノイズ信号と前記誤差マイクロフォン信号とに合わせて前記有効二次推定フィルタの前記応答を形作る二次経路係数制御ブロックと、
前記有効二次推定フィルタの前記応答から前記二次経路推定フィルタの前記応答を生成する二次推定構築ブロックと、
を実装する処理回路と、
を備える、集積回路。 - 前記二次推定構築ブロックが、式
に従って前記有効二次推定フィルタの前記応答から前記二次経路推定フィルタの前記応答を生成し、ただし、SE(z)が前記二次経路推定フィルタの前記応答であり、SEeff(z)が前記有効二次推定フィルタの前記応答であり、H(z)が前記フィードバックフィルタの前記応答である、請求項27に記載の集積回路。 - 前記フィードバックフィルタの前記応答が、前記誤差マイクロフォン信号と、前記二次経路推定とフィルタ処理されたノイズ信号との合計との差に基づく再生補正エラーから前記アンチノイズ信号の少なくとも一部を生成する、請求項27に記載の集積回路。
- パーソナルオーディオデバイスのトランスデューサの付近の周囲のオーディオ音を消去するための方法であって、
前記周囲のオーディオ音を示す参照マイクロフォン信号を受信することと、
前記トランスデューサの出力と、前記トランスデューサにおける前記周囲のオーディオ音とを示す誤差マイクロフォン信号を受信することと、
聞き手への再生のためのソースオーディオ信号を生成することと、
前記誤差マイクロフォン信号内の前記周囲のオーディオ音を最小化するために前記参照マイクロフォン信号をフィルタ処理する適応フィルタの応答を適応させることによって、前記参照マイクロフォン信号からフィードフォワードアンチノイズ信号の成分を生成することと、
前記誤差マイクロフォン信号に基づいてフィードバックアンチノイズ信号の成分を生成することと、
前記誤差マイクロフォン信号を最小化するために、前記フィードバックアンチノイズ信号の電気音響経路をモデル化し、ノイズ信号をフィルタ処理する有効二次経路推定フィルタの応答を適応させることによって、前記ノイズ信号から前記フィルタ処理されたノイズ信号を生成することと、
前記有効二次経路推定フィルタの前記応答から生成される二次経路推定フィルタの応答を適用することによって、前記ソースオーディオ信号から二次経路推定を生成することと、
前記トランスデューサに提供されるオーディオ信号を生成するために、前記フィードフォワードアンチノイズ信号の成分と前記フィードバックアンチノイズ信号の成分とをソースオーディオ信号と組み合わせることと、
を含む、方法。 - 二次推定構築ブロックが、式
に従って前記有効二次経路推定フィルタの前記応答から前記二次経路推定フィルタの前記応答を生成し、ただし、SE(z)が前記二次経路推定フィルタの前記応答であり、SEeff(z)が前記有効二次経路推定フィルタの前記応答であり、H(z)が前記誤差マイクロフォン信号に基づいて前記フィードバックアンチノイズ信号の成分を生成するフィードバックフィルタの前記応答である、請求項30に記載の方法。 - 前記フィードバックアンチノイズ信号の成分を生成することは、前記誤差マイクロフォン信号と、二次経路推定とフィルタ処理されたノイズ信号との合計との差に基づく再生補正エラーをフィードバックフィルタでフィルタ処置することを含む、請求項30に記載の方法。
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GB201519000D0 (en) | 2015-12-09 |
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