JP5675848B2 - レベルキューによる適応ノイズ抑制 - Google Patents
レベルキューによる適応ノイズ抑制 Download PDFInfo
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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
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- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones
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Description
α,β,γ∈[1,2,3]、α≠β≠γ
が成立するように、Mα、Mβ及びMγとして図4Bにおいて表されている。
ILD1={ILD(M1,Mi)、i∈[2,3]}
のように、決定されてよい。
ILD2={ILD1;ILD(Mi,S1)、i∈[β,γ];ILD(Mi,N1)、i∈[α,γ];ILD(S1,N1)}
のように、3つ全てのマイクロフォンのフレームサブバンド信号のエネルギ推定から決定されてよい。
M(t,ω)=λs(t,ω)W(t,ω)+(1−λs(t,ω))M(t−1,ω)
のように、数学的に近似されてよい。ここで、λsは、ウィーナーフィルタ推定と第1のマイクロフォンエネルギE1との関数である。
は、以下でより詳細に論じられる図5におけるモジュール520の出力として導出される。ポストフィルタモジュール414によって処理された後、NPNSモジュール408の周波数サブバンド出力は、発話を推定するよう(ポストフィルタモジュール414からの)ウィーナーフィルタ推定をマスク416で乗じられる。上記のウィーナーフィルタに係る実施形態において、発話推定は、S(t,ω)=X1(t,ω)*M(t,ω)によって近似される。ここで、X1は、NPNSモジュール408の音響信号出力である。
Claims (30)
- ノイズ抑制方法であって、
第1の音響信号、第2の音響信号、及び第3の音響信号を含む3又はそれ以上の音響信号をオーディオ装置において受信するステップと、
前記第3の音響信号及び前記第1の音響信号と、前記第3の音響信号及び前記第2の音響信号とを含む少なくとも1つの対からマイクロフォン間レベル差モジュールを介してマイクロフォン間レベル差情報を決定するステップと、
前記マイクロフォン間レベル差情報に少なくとも部分的に基づくノイズ成分をノイズキャンセルモジュールを介して前記第1の音響信号から減じることを含む前記第1の音響信号に対するノイズキャンセルを実行するステップと
を有するノイズ抑制方法。 - ポストフィルタモジュールを介して前記第1の音響信号の前記ノイズキャンセルを適応させるステップを更に有し、
前記ノイズキャンセルの適応は、前記マイクロフォン間レベル差情報に少なくとも部分的に基づき制御される、
請求項1に記載のノイズ抑制方法。 - カスケードにおいて構成されるノイズ減算ブロックによってノイズキャンセルを実行するステップを更に有し、
前記ノイズ減算ブロックは、前記3又はそれ以上の音響信号のいずれかを処理する、
請求項1に記載のノイズ抑制方法。 - 最初のノイズ減算ブロックが音響信号のいずれかの対を受け、次のノイズ減算ブロックがいずれかの他の音響信号と、前のノイズ減算ブロックの出力とを受ける、
請求項3に記載のノイズ抑制方法。 - 強調信号推定及びノイズリファレンスを用いてポストプロセッサを介してポストフィルタリングを実行するステップを更に有し、
前記強調信号推定は、
音響信号のいずれかの対に対して作用する第1のノイズ減算ブロックの出力、及び
あらゆるカスケード接続されたノイズキャンセル段を含む第2のノイズ減算ブロックの出力
のうちいずれか1つを含み、
前記ノイズリファレンスは、あらゆるカスケード接続されたノイズキャンセル段を含むノイズ減算ブロックの出力、又は前記音響信号の対に含まれていない音響信号のいずれかを含む、
請求項1に記載のノイズ抑制方法。 - クラスタトラッカモジュールへ、及び該クラスタトラッカモジュールを介してポストプロセッサへ前記マイクロフォン間レベル差情報を供給するステップを更に有する、
請求項1に記載のノイズ抑制方法。 - エネルギレベル推定により前記マクロフォン間レベル差モジュールを介して前記マイクロフォン間レベル差情報を生成するステップと、
クラスタトラッカモジュールへ、及び該クラスタトラッカモジュールを介してポストプロセッサへ前記マイクロフォン間レベル差情報を供給するステップと
を更に有する請求項1に記載のノイズ抑制方法。 - 少なくとも1つの周波数解析モジュールを介してエネルギレベル推定を決定するステップと、
前記エネルギレベル推定により前記マイクロフォン間レベル差モジュールを介して前記マイクロフォン間レベル差情報を生成するステップと、
クラスタトラッカモジュールへ、及び該クラスタトラッカモジュールを介してポストプロセッサへ前記マイクロフォン間レベル差情報を供給するステップと
を更に有する請求項1に記載のノイズ抑制方法。 - ノイズ減算ブロックのいずれか1つの出力として、ノイズリファレンス信号を生成するステップと、
前記ノイズリファレンス信号といずれかのノイズ減算ブロックのスピーチリファレンス出力とに少なくとも基づきノイズ推定モジュールを介してノイズ推定を生成するステップと、
ポストプロセッサへ前記ノイズ推定を供給するステップと
を更に有し、
前記ノイズ減算ブロックの他の1つは、いずれかの音響信号と、前記ノイズ減算ブロックの中の前のノイズ減算ブロックのノイズ出力とを受け取る、
請求項1に記載のノイズ抑制方法。 - 前記マイクロフォン間レベル差は、クラスタトラッカモジュールによって正規化される、
請求項4に記載のノイズ抑制方法。 - ノイズ抑制システムであって、
メモリにおいて記憶され、第1の音響信号、第2の音響信号、及び第3の音響信号を含む3又はそれ以上の音響信号を受信するようプロセッサによって実行される周波数解析モジュールと、
メモリにおいて記憶され、前記第3の音響信号及び前記第1の音響信号と、前記第3の音響信号及び前記第2の音響信号とを含む少なくとも1つの対からマイクロフォン間レベル差情報を決定するようプロセッサによって実行されるマイクロフォン間レベル差モジュールと、
メモリにおいて記憶され、前記マイクロフォン間レベル差情報に少なくとも部分的に基づくノイズ成分を前記第1の音響信号から減じることによって前記第1の音響信号に対してノイズキャンセルを実行するようプロセッサによって実行されるノイズキャンセルモジュールと
を有するノイズ抑制システム。 - ポストフィルタモジュールが、前記第1の音響信号の前記ノイズキャンセルを適応させるよう実行され、前記ノイズキャンセルの適応は、前記マイクロフォン間レベル差情報に少なくとも部分的に基づき制御される、
請求項11に記載のノイズ抑制システム。 - 更に、カスケード連通において構成されるノイズ減算ブロックによってノイズキャンセルを実行すること含み、
前記ノイズ減算ブロックは、前記3又はそれ以上の音響信号のいずれかを処理する、
請求項11に記載のノイズ抑制システム。 - 最初のノイズ減算ブロックは、プロセッサによって実行される場合に、音響信号のいずれかの対を受け、次のノイズ減算ブロックは、プロセッサによって実行される場合に、いずれかの他の音響信号と、前のノイズ減算ブロックの出力とを受ける、
請求項13に記載のノイズ抑制システム。 - メモリにおいて記憶され、強調信号推定及びノイズリファレンスを用いてポストフィルタリングを実行するようプロセッサによって実行されるポストフィルタモジュールを更に有し、
前記強調信号推定は、
音響信号のいずれかの対に対して作用する第1のノイズ減算ブロックの出力、及び
あらゆるカスケード接続されたノイズキャンセル段を含む第2のノイズ減算ブロックの出力
のうちいずれか1つを含み、
前記ノイズリファレンスは、あらゆるカスケード接続されたノイズキャンセル段を含むノイズ減算ブロックの出力、又は前記音響信号の対に含まれていない音響信号のいずれかを含む、
請求項11に記載のノイズ抑制システム。 - 前記マイクロフォン間レベル差情報は、クラスタトラッカモジュールへ、及び該クラスタトラッカモジュールを介してポストプロセッサへ供給される、
請求項11に記載のノイズ抑制システム。 - 前記マイクロフォン間レベル差モジュールは、
エネルギレベル推定により当該マイクロフォン間レベル差モジュールを介して前記マイクロフォン間レベル差情報を生成し、
クラスタトラッカモジュールへ、及び該クラスタトラッカモジュールを介してポストプロセッサへ前記マイクロフォン間レベル差情報を供給する
ようプロセッサによって実行される、
請求項11に記載のノイズ抑制システム。 - 少なくとも1つの周波数解析モジュールは、実行される場合に、エネルギレベル推定を決定し、
前記マイクロフォン間レベル差モジュールは、実行される場合に、前記エネルギレベル推定により前記マイクロフォン間レベル差情報を生成し、クラスタトラッカモジュールへ、及び該クラスタトラッカモジュールを介してポストプロセッサへ前記マイクロフォン間レベル差情報を供給する、
請求項11に記載のノイズ抑制システム。 - ノイズ減算ブロックは、実行される場合に、ノイズリファレンス信号を他のノイズ減算ブロックへ供給し、前記ノイズ減算ブロックは、いずれかの音響信号と前のノイズ減算ブロックのノイズ出力とを受け、
ノイズ推定モジュールは、実行される場合に、前記ノイズリファレンス信号と、前記他のノイズ減算ブロックからのスピーチリファレンス出力とに少なくとも基づきノイズ推定を生成する、
請求項11に記載のノイズ抑制方法。 - 前記マイクロフォン間レベル差は、クラスタトラッカモジュールによって正規化される、
請求項14に記載のノイズ抑制方法。 - ノイズ抑制方法を実行するようプロセッサによって実行されるプログラムを坦持する、非一時的なコンピュータ可読記憶媒体であって、
前記ノイズ抑制方法は、
第1の音響信号、第2の音響信号、及び第3の音響信号を含む3又はそれ以上の音響信号をオーディオ装置において受信するステップと、
前記第3の音響信号及び前記第1の音響信号と、前記第3の音響信号及び前記第2の音響信号とを含む少なくとも1つの対からマイクロフォン間レベル差情報を決定するステップと、
前記マイクロフォン間レベル差情報に少なくとも部分的に基づくノイズ成分を前記第1の音響信号から減じることを含む前記第1の音響信号に対するノイズキャンセルを実行するステップと
を有する、
非一時的なコンピュータ可読記憶媒体。 - 前記第1の音響信号の前記ノイズキャンセルを適応させるステップを更に有し、
前記ノイズキャンセルの適応は、前記マイクロフォン間レベル差情報に少なくとも部分的に基づき制御される、
請求項21に記載の非一時的なコンピュータ可読記憶媒体。 - カスケードにおいて構成されるノイズ減算ブロックによってノイズキャンセルを実行するステップを更に有し、
前記ノイズ減算ブロックは、前記3又はそれ以上の音響信号のいずれかを処理する、
請求項21に記載の非一時的なコンピュータ可読記憶媒体。 - 最初のノイズ減算ブロックが音響信号のいずれかの対を受け、次のノイズ減算ブロックがいずれかの他の音響信号と、前のノイズ減算ブロックの出力とを受ける、
請求項23に記載の非一時的なコンピュータ可読記憶媒体。 - 強調信号推定及びノイズリファレンスを用いてポストフィルタリングを実行するステップを更に有し、
前記強調信号推定は、
音響信号のいずれかの対に対して作用する第1のノイズ減算ブロックの出力、及び
あらゆるカスケード接続されたノイズキャンセル段を含む第2のノイズ減算ブロックの出力
のうちいずれか1つを含み、
前記ノイズリファレンスは、あらゆるカスケード接続されたノイズキャンセル段を含むノイズ減算ブロックの出力、又は前記音響信号の対に含まれていない音響信号のいずれかを含む、
請求項21に記載の非一時的なコンピュータ可読記憶媒体。 - クラスタトラッカモジュールへ、及び該クラスタトラッカモジュールを介してポストプロセッサへ前記マイクロフォン間レベル差情報を供給するステップを更に有する、
請求項21に記載の非一時的なコンピュータ可読記憶媒体。 - エネルギレベル推定によりマクロフォン間レベル差モジュールを介して前記マイクロフォン間レベル差情報を生成するステップと、
クラスタトラッカモジュールへ、及び該クラスタトラッカモジュールを介してポストプロセッサへ前記マイクロフォン間レベル差情報を供給するステップと
を更に有する請求項21に記載の非一時的なコンピュータ可読記憶媒体。 - 少なくとも1つの周波数解析モジュールを介してエネルギレベル推定を決定するステップと、
前記エネルギレベル推定によりマイクロフォン間レベル差モジュールを介して前記マイクロフォン間レベル差情報を生成するステップと、
クラスタトラッカモジュールへ、及び該クラスタトラッカモジュールを介してポストプロセッサへ前記マイクロフォン間レベル差情報を供給するステップと
を更に有する請求項21に記載の非一時的なコンピュータ可読記憶媒体。 - ノイズ減算ブロックのいずれか1つの出力として、ノイズリファレンス信号を生成するステップと、
前記ノイズリファレンス信号といずれかのノイズ減算ブロックのスピーチリファレンス出力とに少なくとも基づきノイズ推定モジュールを介してノイズ推定を生成するステップと、
ポストプロセッサへ前記ノイズ推定を供給するステップと
を更に有し、
前記ノイズ減算ブロックの他の1つは、いずれかの音響信号と、前記ノイズ減算ブロックの中の前のノイズ減算ブロックのノイズ出力とを受け取る、
請求項21に記載の非一時的なコンピュータ可読記憶媒体。 - 前記マイクロフォン間レベル差は、クラスタトラッカモジュールによって正規化される、
請求項24に記載の非一時的なコンピュータ可読記憶媒体。
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US12/693,998 US8718290B2 (en) | 2010-01-26 | 2010-01-26 | Adaptive noise reduction using level cues |
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PCT/US2011/022462 WO2011094232A1 (en) | 2010-01-26 | 2011-01-25 | Adaptive noise reduction using level cues |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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2014
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Cited By (5)
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US9830899B1 (en) | 2006-05-25 | 2017-11-28 | Knowles Electronics, Llc | Adaptive noise cancellation |
US9437180B2 (en) | 2010-01-26 | 2016-09-06 | Knowles Electronics, Llc | Adaptive noise reduction using level cues |
US9502048B2 (en) | 2010-04-19 | 2016-11-22 | Knowles Electronics, Llc | Adaptively reducing noise to limit speech distortion |
US9378754B1 (en) | 2010-04-28 | 2016-06-28 | Knowles Electronics, Llc | Adaptive spatial classifier for multi-microphone systems |
US10257611B2 (en) | 2016-05-02 | 2019-04-09 | Knowles Electronics, Llc | Stereo separation and directional suppression with omni-directional microphones |
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US20110182436A1 (en) | 2011-07-28 |
US20140205107A1 (en) | 2014-07-24 |
US8718290B2 (en) | 2014-05-06 |
TW201142829A (en) | 2011-12-01 |
US9437180B2 (en) | 2016-09-06 |
JP2013518477A (ja) | 2013-05-20 |
KR20120114327A (ko) | 2012-10-16 |
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