JP2016526696A - 狭帯域ノイズの検出及び消去のためのシステム及び方法 - Google Patents
狭帯域ノイズの検出及び消去のためのシステム及び方法 Download PDFInfo
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Abstract
Description
NFRn=αNFRn−1+(1−α)(「現在の狭帯域電力」/「現在の全帯域電力」)
として計算してもよく、ここでNFRnは所与の離散時間間隔nでの狭帯域対全帯域の比の値であり、NFRn−1は、直前の離散時間間隔n−1での狭帯域対全帯域の比の値であり、αは、αが増加すると、狭帯域対全帯域の比の応答がより滑らかになり、その逆も成り立つような、直前の離散時間間隔n−1での、狭帯域対全帯域の比の計算における相対的な重みを決定する平滑化係数である。このようにして、狭帯域対全帯域の比は、狭帯域対全帯域の比の直前の値と、リファレンス・マイクロホン信号の現在の狭帯域電力をリファレンス・マイクロホン信号の現在の全帯域電力で除したのと等しい量との混合平均として計算され得る。
NFRn=αNFRn−1+(1−α)(「現在の狭帯域電力」/「調整された現在の全帯域電力」)
として計算してもよく、ここで「調整された現在の全帯域電力」は、リファレンス・マイクロホンの「現在の全帯域電力」から狭帯域電力の特定の周波数範囲外に存在する信号異常値を減じたものに等しい。そのような信号異常値は、任意の適切な方法で規定され及び/又は識別され得る。例えば、信号異常値は、その狭帯域周波数の範囲外で発生する、全帯域電力スペクトルの特定の周波数での信号を含むことがあり、そのような周波数での大きさは隣接する周波数での大きさよりも著しく大きい(例えば、2倍、10倍など)。したがって、狭帯域対全帯域の比は、狭帯域対全帯域の比の直前の値と、リファレンス・マイクロホン信号の現在の狭帯域電力を、リファレンス・マイクロホン信号の現在の全帯域電力から狭帯域電力の周波数範囲外に存在するリファレンス・マイクロホン信号の異常値の現在の電力を減じたのと等しい量で除したのと等しい量との混合平均として計算される。
NFRn=αNFRn−1+(1−α)(「現在の狭帯域電力」/「調整された現在の全帯域電力」)、
信号外乱が離散時間間隔n中に検出される場合は、
NFRn=NFRn−1
として計算してもよい。本明細書で使用されるように、用語「信号外乱」は、狭帯域ノイズの検出に誤って影響を及ぼすと予想されるリファレンス・マイクロホンに飛び込む、いかなる音も含むことができ、リファレンス・マイクロホンの近くで発生する突発的な音声若しくは他の音、周囲の風の存在、物体とリファレンス・マイクロホンとの物理的な接触、瞬間的なトーン、及び/又はその他の同様の音を含んでもよい。そのような外乱は、パーソナル・オーディオ機器に関連付けられたリファレンス・マイクロホン、別のマイクロホン、及び/又はその他のセンサによって検出され得る。
Claims (24)
- 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の、前記ハウジングに取り付けられた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の、前記ハウジングに取り付けられたリファレンス・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の、前記トランスデューサ近傍で前記ハウジングに取り付けられたエラー・マイクロホンと、
前記リスナーに聞こえる前記周囲のオーディオ音の存在を低減させるように、前記リファレンス・マイクロホン信号から前記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を実装する処理回路であって、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適応フィルタの前記応答を適応させ、さらに、計算された狭帯域対全帯域の比に従って前記適応フィルタの前記応答を適応させることによって、前記エラー・マイクロホン信号と前記リファレンス・マイクロホン信号とに合わせて前記適応フィルタの前記応答を成形する係数制御ブロックを実装し、当該狭帯域対全帯域の比は、前記リファレンス・マイクロホン信号の全帯域電力で除した前記リファレンス・マイクロホン信号の狭帯域電力の関数である、処理回路と、
を備えるパーソナル・オーディオ機器。 - 前記狭帯域対全帯域の比が、前記狭帯域対全帯域の比の直前の値と、前記リファレンス・マイクロホン信号の現在の全帯域電力で除した前記リファレンス・マイクロホン信号の現在の狭帯域電力と等しい量との混合平均として計算される、請求項1に記載のパーソナル・オーディオ機器。
- 前記狭帯域対全帯域の比が、前記狭帯域対全帯域の比の直前の値と、前記狭帯域電力の周波数範囲外に存在するリファレンス・マイクロホン信号の異常値の現在の電力を減じた前記リファレンス・マイクロホン信号の現在の全帯域電力と等しい量で除した前記リファレンス・マイクロホン信号の現在の狭帯域電力と等しい量との混合平均として計算される、請求項1に記載のパーソナル・オーディオ機器。
- 前記狭帯域対全帯域の比が、前記リファレンス・マイクロホン信号上で外乱が検出されないとの判定に応答して、前記狭帯域対全帯域の比の直前の値と、前記リファレンス・マイクロホン信号の現在の全帯域電力で除した前記リファレンス・マイクロホン信号の現在の狭帯域電力と等しい量との混合平均として計算され、
前記狭帯域対全帯域の比が、前記リファレンス・マイクロホン信号上で外乱が検出されるという判定に応答して、前記狭帯域対全帯域の比のリファレンス・マイクロホン信号の前記直前の値と等しいとして計算される、
請求項1に記載のパーソナル・オーディオ機器。 - 前記狭帯域電力が、およそ50Hzとおよそ380Hzとの間の周波数に対する前記リファレンス・マイクロホン信号の電力からなる、請求項1に記載のパーソナル・オーディオ機器。
- 前記処理回路が、前記計算された狭帯域対全帯域の比に基づいて前記係数制御ブロックの少なくとも1つの係数のステップサイズを制御することによって、前記計算された狭帯域対全帯域の比に従って前記適応フィルタの前記応答を適応させる、請求項1に記載のパーソナル・オーディオ機器。
- 前記処理回路が、前記計算された狭帯域対全帯域の比に基づいて前記適応フィルタの適応ノイズ制御利得を制御することによって、前記計算された狭帯域対全帯域の比に従って前記適応フィルタの前記応答を適応させる、請求項1に記載のパーソナル・オーディオ機器。
- 前記リファレンス・マイクロホン信号の前記狭帯域電力が、主として車両での移動によって引き起こされる周囲のノイズに起因する、請求項1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前記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、
リファレンス・マイクロホン信号を生成するように、リファレンス・マイクロホンによって周囲のオーディオ音を測定するステップと、
エラー・マイクロホン信号を生成するように、エラー・マイクロホンによって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測定するステップと、
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し、さらに、計算された狭帯域対全帯域の比に従って前記リファレンス・マイクロホンの前記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、前記リファレンス・マイクロホンによる前記測定の結果と前記エラー・マイクロホンによる前記測定とから、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ためにアンチノイズ信号を適応的に生成するステップであって、当該狭帯域対全帯域の比は、前記リファレンス・マイクロホン信号の全帯域電力で除した前記リファレンス・マイクロホン信号の狭帯域電力の関数である、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。 - 前記狭帯域対全帯域の比が、前記狭帯域対全帯域の比の直前の値と、前記リファレンス・マイクロホン信号の現在の全帯域電力で除した前記リファレンス・マイクロホン信号の現在の狭帯域電力と等しい量との混合平均として計算される、請求項9に記載の方法。
- 前記狭帯域対全帯域の比が、前記狭帯域対全帯域の比の直前の値と、前記狭帯域電力の周波数範囲外に存在するリファレンス・マイクロホン信号の異常値の現在の電力を減じた前記リファレンス・マイクロホン信号の現在の全帯域電力と等しい量で除した前記リファレンス・マイクロホン信号の現在の狭帯域電力と等しい量との混合平均として計算される、請求項9に記載の方法。
- 前記狭帯域対全帯域の比が、前記リファレンス・マイクロホン信号上で外乱が検出されないとの判定に応答して、前記狭帯域対全帯域の比の直前の値と、前記リファレンス・マイクロホン信号の現在の全帯域電力で除した前記リファレンス・マイクロホン信号の現在の狭帯域電力と等しい量との混合平均として計算され、
前記狭帯域対全帯域の比が、前記リファレンス・マイクロホン信号上で外乱が検出されるという判定に応答して、前記狭帯域対全帯域の比のリファレンス・マイクロホン信号の前記直前の値と等しいとして計算される、
請求項9に記載の方法。 - 前記狭帯域電力が、およそ50Hzとおよそ380Hzとの間の周波数に対する前記リファレンス・マイクロホン信号の電力からなる、請求項9に記載の方法。
- 前記計算された狭帯域対全帯域の比に従って前記適応フィルタの前記応答を適応させるステップが、前記計算された狭帯域対全帯域の比に基づいて前記係数制御ブロックの少なくとも1つの係数のステップサイズを制御するステップを含む、請求項9に記載の方法。
- 前記計算された狭帯域対全帯域の比に従って前記適応フィルタの前記応答を適応させるステップが、前記計算された狭帯域対全帯域の比に基づいて前記適応フィルタの適応ノイズ制御利得を制御するステップを含む、請求項9に記載の方法。
- 前記リファレンス・マイクロホン信号の前記狭帯域電力が、主として車両での移動によって引き起こされる周囲のノイズに起因する、請求項9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前記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、
前記リスナーに聞こえる前記周囲のオーディオ音の存在を低減させるように、前記リファレンス・マイクロホン信号から前記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を実装する処理回路であって、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適応フィルタの前記応答を適応させ、さらに、計算された狭帯域対全帯域の比に従って前記適応フィルタの前記応答を適応させることによって、前記エラー・マイクロホン信号と前記リファレンス・マイクロホン信号とに合わせて前記適応フィルタの前記応答を成形する係数制御ブロックを実装し、当該狭帯域対全帯域の比は、前記リファレンス・マイクロホン信号の全帯域電力で除した前記リファレンス・マイクロホン信号の狭帯域電力の関数である、処理回路と、
を備える集積回路。 - 前記狭帯域対全帯域の比が、前記狭帯域対全帯域の比の直前の値と、前記リファレンス・マイクロホン信号の現在の全帯域電力で除した前記リファレンス・マイクロホン信号の現在の狭帯域電力と等しい量との混合平均として計算される、請求項17に記載の集積回路。
- 前記狭帯域対全帯域の比が、前記狭帯域対全帯域の比の直前の値と、前記狭帯域電力の周波数範囲外に存在するリファレンス・マイクロホン信号の異常値の現在の電力を減じた前記リファレンス・マイクロホン信号の現在の全帯域電力と等しい量で除した前記リファレンス・マイクロホン信号の現在の狭帯域電力と等しい量との混合平均として計算される、請求項17に記載の集積回路。
- 前記狭帯域対全帯域の比が、前記リファレンス・マイクロホン信号上で外乱が検出されないとの判定に応答して、前記狭帯域対全帯域の比の直前の値と、前記リファレンス・マイクロホン信号の現在の全帯域電力で除した前記リファレンス・マイクロホン信号の現在の狭帯域電力と等しい量との混合平均として計算され、
前記狭帯域対全帯域の比が、前記リファレンス・マイクロホン信号上で外乱が検出されるという判定に応答して、前記前記狭帯域対全帯域の比のリファレンス・マイクロホン信号の前記直前の値と等しいとして計算される、
請求項17に記載の集積回路。 - 前記狭帯域電力が、およそ50Hzとおよそ380Hzとの間の周波数に対する前記リファレンス・マイクロホン信号の電力からなる、請求項17に記載の集積回路。
- 前記処理回路が、前記計算された狭帯域対全帯域の比に基づいて前記係数制御ブロックの少なくとも1つの係数のステップサイズを制御することによって、前記計算された狭帯域対全帯域の比に従って前記適応フィルタの前記応答を適応させる、請求項17に記載の集積回路。
- 前記処理回路が、前記計算された狭帯域対全帯域の比に基づいて前記適応フィルタの適応ノイズ制御利得を制御することによって、前記計算された狭帯域対全帯域の比に従って前記適応フィルタの前記応答を適応させる、請求項17に記載の集積回路。
- 前記リファレンス・マイクロホン信号の前記狭帯域電力が、主として車両での移動によって引き起こされる周囲のノイズに起因する、請求項17に記載の集積回路。
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CN105453587A (zh) | 2016-03-30 |
US20140369517A1 (en) | 2014-12-18 |
EP3008916A1 (en) | 2016-04-20 |
WO2014200787A1 (en) | 2014-12-18 |
CN105453587B (zh) | 2019-04-09 |
KR102205574B1 (ko) | 2021-01-21 |
EP3008916B1 (en) | 2021-12-22 |
JP6289622B2 (ja) | 2018-03-07 |
US9264808B2 (en) | 2016-02-16 |
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