JP2016531329A - 二次経路を養成するために内部ホワイト・ノイズを適応的に成形することによる適応雑音消去のためのシステム及び方法 - Google Patents
二次経路を養成するために内部ホワイト・ノイズを適応的に成形することによる適応雑音消去のためのシステム及び方法 Download PDFInfo
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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
- G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
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- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/181—Low frequency amplifiers, e.g. audio preamplifiers
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- 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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- 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
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- G10K2210/3023—Estimation of noise, e.g. on error signals
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- G10K2210/3045—Multiple acoustic inputs, single acoustic output
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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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- G10K2210/3049—Random noise used, e.g. in model identification
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/50—Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower
- H03F3/52—Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower with tubes only
Abstract
Description
Claims (18)
- パーソナル・オーディオ機器ハウジングと、
リスナー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における周囲のオーディオ音の前記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オーディオ信号を再現するために前記ハウジングに結合された当該トランスデューサと、
前記周囲のオーディオ音を示すリファレンス・マイクロホン信号を提供するために前記ハウジングに結合されたリファレンス・マイクロホンと、
前記トランスデューサの前記音響出力と、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エラー・マイクロホン信号を提供するために前記トランスデューサの近傍で前記ハウジングに結合されたエラー・マイクロホンと、
処理回路であって、
前記リファレンス・マイクロホン信号からアンチノイズ信号を生成する応答を有する適応フィルタであって、前記応答が前記リファレンス・マイクロホン信号と再生補正エラーとに合わせて成形され、前記再生補正エラーが前記エラー・マイクロホン信号と二次経路推定との差に基づく、適応フィルタと、
前記ソース・オーディオ信号の電気的及び音響的経路をモデル化し、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、
前記再生補正エラーを最小化するように、前記二次経路推定フィルタの前記応答を適応させることによって、前記ソース・オーディオ信号と前記再生補正エラーとに合わせて前記二次経路推定フィルタの前記応答を成形する二次係数制御ブロックと、
前記ソース・オーディオ信号にノイズ信号を注入するためのノイズ注入部分であって、前記ノイズ信号が前記再生補正エラーに基づいて成形される、ノイズ注入部分と
を備える処理回路と、
を備えるパーソナル・オーディオ機器。 - 前記ノイズ注入部分が、
ホワイト・ノイズ信号を生成するためのノイズ源と、
前記ホワイト・ノイズ信号から前記ノイズ信号を生成する応答を有する周波数成形フィルタと、
前記再生補正エラーに合わせて前記周波数成形フィルタの前記応答を成形する係数制御ブロックと、
を備える、請求項1に記載のパーソナル・オーディオ機器。 - 前記係数制御ブロックが前記再生補正エラーの周波数スペクトルを推定する適応線形予測係数システムを実装する、請求項2に記載のパーソナル・オーディオ機器。
- 前記ノイズ注入部分が、前記ノイズ信号が前記リスナーに実質的に感知できないように、前記エラー・マイクロホン信号の振幅を実質的に下回る振幅まで前記ノイズ信号を減衰させるように構成された利得要素を備える、請求項2に記載のパーソナル・オーディオ機器。
- 前記ノイズ注入部分が、前記二次経路推定フィルタの前記応答に対して逆の応答を有する逆二次経路推定フィルタを備え、前記逆二次経路推定フィルタが、前記ソース・オーディオ信号への前記ノイズ信号の注入の前に前記ノイズ信号に対してその応答を適用する、請求項2に記載のパーソナル・オーディオ機器。
- 前記ノイズ注入部分が、
前記ノイズ信号が前記リスナーに実質的に感知できないように、前記エラー・マイクロホン信号の振幅を実質的に下回る振幅まで前記ノイズ信号を減衰させるように構成された利得要素と、
前記二次経路推定フィルタの前記応答に対して逆の応答を有する逆二次経路推定フィルタであって、前記逆二次経路推定フィルタが、前記ソース・オーディオ信号への前記ノイズ信号の注入の前に前記ノイズ信号に対してその応答を適用する、逆二次経路推定フィルタと、
を備える、請求項2に記載のパーソナル・オーディオ機器。 - パーソナル・オーディオ機器のトランスデューサの近傍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リファレンス・マイクロホン信号を受信するステップと、
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エラー・マイクロホン信号を受信するステップと、
リスナーへの再生のためのソース・オーディオ信号を生成するステップと、
前記エラー・マイクロホン信号中の前記周囲のオーディオ音を最小化するように、前記リファレンス・マイクロホンの出力をフィルタする適応フィルタの応答を適応させることによって、前記トランスデューサの音響出力での周囲のオーディオ音の前記影響を打ち消すアンチノイズ信号を、前記リファレンス・マイクロホン信号から生成するステップと、
前記ソース・オーディオ信号の電気的及び音響的経路をモデル化するように構成された二次経路推定適応フィルタで前記ソース・オーディオ信号をフィルタし、再生補正エラーを最小化するように前記二次経路推定適応フィルタの前記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二次経路推定を適応的に生成するステップであって、前記再生補正エラーが前記エラー・マイクロホン信号と前記二次経路推定との差に基づくステップと、
前記ソース・オーディオ信号にノイズ信号を注入するステップであって、前記ノイズ信号が前記再生補正エラーに基づいて成形されるステップと、
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ように、前記アンチノイズ信号を前記ソース・オーディオ信号と組み合わせるステップと、
を含む方法。 - 周波数成形フィルタでホワイト・ノイズ信号をフィルタすることによって前記ノイズ信号を生成するステップであって、前記周波数成形フィルタの応答が前記再生補正エラーに合わせて成形される、ステップをさらに含む、請求項7に記載の方法。
- 前記周波数成形フィルタの応答が、前記再生補正エラーの周波数スペクトルを推定する適応線形予測係数システムに基づいて成形される、請求項8に記載の方法。
- 前記ノイズ信号が前記リスナーに実質的に感知できないように、前記エラー・マイクロホン信号の振幅を実質的に下回る振幅まで前記ノイズ信号を減衰させるステップをさらに含む、請求項8に記載の方法。
- 前記ソース・オーディオ信号への前記ノイズ信号の注入の前に前記ノイズ信号に対して逆二次経路推定フィルタ応答の応答を適用するステップであって、前記逆二次経路推定フィルタ応答が前記二次経路推定フィルタの前記応答に対して逆であるステップをさらに含む、請求項8に記載の方法。
- 前記ノイズ信号が前記リスナーに実質的に感知できないように、前記エラー・マイクロホン信号の振幅を実質的に下回る振幅まで前記ノイズ信号を減衰させるステップと、
前記ソース・オーディオ信号への前記ノイズ信号の注入の前に前記ノイズ信号に対して逆二次経路推定フィルタ応答の応答を適用するステップであって、前記逆二次経路推定フィルタ応答が前記二次経路推定フィルタの前記応答に対して逆であるステップと、
をさらに含む、請求項8に記載の方法。 - パーソナル・オーディオ機器の少なくとも一部を実装するための集積回路であって、
リスナー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における周囲のオーディオ音の前記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当該トランスデューサに提供するための出力部と、
前記周囲のオーディオ音を示すリファレンス・マイクロホン信号を受信するためのリファレンス・マイクロホン入力部と、
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エラー・マイクロホン信号を受信するためのエラー・マイクロホン入力部と、
処理回路であって、
前記リファレンス・マイクロホン信号からアンチノイズ信号を生成する応答を有する適応フィルタであって、前記応答が前記リファレンス・マイクロホン信号と再生補正エラーとに合わせて成形され、前記再生補正エラーが前記エラー・マイクロホン信号と二次経路推定との差に基づく、適応フィルタと、
前記ソース・オーディオ信号の電気的及び音響的経路をモデル化し、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、
前記再生補正エラーを最小化するように、前記二次経路推定フィルタの前記応答を適応させることによって、前記ソース・オーディオ信号と前記再生補正エラーとに合わせて前記二次経路推定フィルタの前記応答を成形する二次係数制御ブロックと、
前記ソース・オーディオ信号にノイズ信号を注入するためのノイズ注入部分であって、前記ノイズ信号が前記再生補正エラーに基づいて成形される、ノイズ注入部分と
を備える処理回路と、
を備える集積回路。 - 前記ノイズ注入部分が、
ホワイト・ノイズ信号を生成するためのノイズ源と、
前記ホワイト・ノイズ信号から前記ノイズ信号を生成する応答を有する周波数成形フィルタと、
前記再生補正エラーに合わせて前記周波数成形フィルタの前記応答を成形する係数制御ブロックと、
を備える、請求項13に記載の集積回路。 - 前記係数制御ブロックが前記再生補正エラーの周波数スペクトルを推定する適応線形予測係数システムを実装する、請求項14に記載の集積回路。
- 前記ノイズ注入部分が、前記ノイズ信号が前記リスナーに実質的に感知できないように、前記エラー・マイクロホン信号の振幅を実質的に下回る振幅まで前記ノイズ信号を減衰させるように構成された利得要素を備える、請求項14に記載の集積回路。
- 前記ノイズ注入部分が、前記二次経路推定フィルタの前記応答に対して逆の応答を有する逆二次経路推定フィルタを備え、前記逆二次経路推定フィルタが、前記ソース・オーディオ信号への前記ノイズ信号の注入の前に前記ノイズ信号に対してその応答を適用する、請求項14に記載の集積回路。
- 前記ノイズ注入部分が、
前記ノイズ信号が前記リスナーに実質的に感知できないように、前記エラー・マイクロホン信号の振幅を実質的に下回る振幅まで前記ノイズ信号を減衰させるように構成された利得要素と、
前記二次経路推定フィルタの前記応答に対して逆の応答を有する逆二次経路推定フィルタであって、前記逆二次経路推定フィルタが、前記ソース・オーディオ信号への前記ノイズ信号の注入の前に前記ノイズ信号に対してその応答を適用する、逆二次経路推定フィルタと、
を備える、請求項14に記載の集積回路。
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