JP2009522942A - 発話改善のためにマイク間レベル差を用いるシステム及び方法 - Google Patents
発話改善のためにマイク間レベル差を用いるシステム及び方法 Download PDFInfo
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- H—ELECTRICITY
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- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
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- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
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- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
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Abstract
Description
E1(t,ω)=λE|X1(t,ω)|2+(1−λE)E1(t−1,ω)
ここで、λEは平均化時間定数を決定する0と1との間の数であり、X1(t,ω)は平均化時間定数における一次マイク106の音響信号であり、ωは周波数を表し、tは時間を表す。図示しているように、一次マイク106の現エネルギーレベルE1(t,ω)は、一次マイク106の前エネルギーレベルE1(t−1,ω)の前エネルギーレベルに依存する。一部の他の実施形態においては、λEの値は、異なる周波数チャネルについて異なることが可能である。好ましい時定数T(例えば、4msec)及びサンプリング周波数fs(例えば、16kHz)が与えられる場合、λEの値は、次式のように近似されることが可能である。
二次マイク108から受信された音響信号のエネルギーレベルは、同様の例示としての次式により近似されることが可能であり、
E2(t,ω)=λE|X2(t、ω)|2+(1−λE)E2(t−1,ω)
ここで、X2(t、ω)は無指向性領域における二次マイク108の音響信号である。一次マイク106についてのエネルギーレベルの演算と同様に、二次マイク108のエネルギーレベルE2(t,ω)は、二次マイク108の前エネルギーレベルE2(t−1,ω)に依存する。
ILD(t、ω)=[1−2(E1(t,ω)E2(t,ω))/(E1 2(t,ω)+E2 2(t,ω)) ]*sign(E1(t,ω)−E2(t,ω))
ここで、E1は一次マイク106のエネルギーレベルであり、E2は一次マイク108のエネルギーレベルであり、それらの両方は、エネルギーモジュール304から得られる。この式は、−1と1との間の境界付けられた結果を与える。例えば、E2が0になるとき、ILDは1になり、E1が0になるとき、ILDは−1になる。従って、発話が一次マイクに近接していて、雑音が存在しない、即ち、ILD=1であるが、更なる雑音が付加されるとき、ILDは変化する。更に、更なる雑音がマイク106及び108の両方により取り込まれるとき、発話を雑音から区別することはより困難になる。
ここで、ILDの演算はまた、−1と1との間で境界付けられる。それ故、この代替のILDの演算は、本発明の一実施形態において用いられることが可能である。
図示しているように、この実施形態における雑音推定は、一次マイク106の現エネルギー推定E1(t,ω)及び前時間フレームの雑音推定N(t−1,ω)の最小統計値に基づくものである。従って、雑音推定は、効率的に且つ低いレイテンシで実行される。
W=(Ps/(Ps+Pn))α
ここで、Psは発話のパワースペクトル密度であり、Pnは雑音のパワースペクトル密度である。一実施形態に従って、Pnは雑音推定、即ち、雑音推定モジュール308により演算されるN(t,ω)である。例示としての実施形態においては、Ps=E1(t,ω)−βN(t,ω)であり、ここで、E1(t,ω)はエネルギーモジュール304からの一次マイク106のエネルギー推定であり、N(t,ω)は雑音推定モジュール308により与えられる雑音推定である。雑音推定は各々のフレームにより変化するため、フィルタ推定がまた、各々のフレームにより変化する。
M(t,ω)=λs(t,ω)W(t,ω)+(1−λs(t,ω))M(t−1,ω)
ここで、λsはウィーナフィルタ推定及び一次マイク推定E1の関数である。
Claims (20)
- 発話を改善する方法であって:
一次マイクにおいて一次音響信号を、そして二次マイクにおいて二次音響信号を受信する段階;
フレーム中のフィルタ推定と、前記一次音響信号の雑音推定に基づく前記フィルタ推定と、前記一次音響信号のエネルギー推定と、前記一次音響信号及び前記二次音響信号に基づくマイク間レベル差と、を決定する段階;並びに
発話推定を生成するように、前記一次音響信号に前記フィルタ推定を適用する段階;
を有する方法。 - 請求項1に記載の方法であって、前記フレーム中に前記音響信号の各々についてエネルギー推定を決定する段階を更に有する、方法。
- 請求項2に記載の方法であって、前記一次音響信号の前記エネルギー推定は、式E1(t,ω)=λE|X1(t、ω)|2+(1−λE)E1(t−1,ω)として近似される、方法。
- 請求項2に記載の方法であって、前記二次音響信号の前記エネルギー推定は、式E2(t,ω)=λE|X2(t、ω)|2+(1−λE)E2(t−1,ω)として近似される、方法。
- 請求項2に記載の方法であって、前記フレームについて前記マイク間レベルを決定するように前記エネルギー推定を用いる段階を更に有する、方法。
- 請求項5に記載の方法であって、前記マイク間レベル差は、式ILD(t、ω)=[1−2(E1(t,ω)E2(t,ω))/(E1 2(t,ω)+E2 2(t,ω)) ]*sign(E1(t,ω)−E2(t,ω))により近似される、方法。
- 請求項5に記載の方法であって、前記マイク間レベル差は、式ILD(t、ω)=(E1(t,ω)−E2(t,ω))/(E1(t,ω)+E2(t,ω))により近似される、方法。
- 請求項1に記載の方法であって、前記ノイズ推定は、前記一次音響信号のエネルギー推定及び前記マイク間レベル差に基づく、方法。
- 請求項8に記載の方法であって、前記マイク間レベル差は、式N(t,ω)=λ1(t、ω)E1(t,ω)+(1−λ1(t、ω))min[N(t−1,ω),E1(t,ω)]として近似される、方法。
- 請求項1に記載の方法であって、前記一次音響信号に前記フィルタ推定を適用する前に前記フィルタ推定を平滑化する段階を更に有する、方法。
- 請求項10に記載の方法であって、前記マイク間レベル差は、式M(t,ω)=λs(t、ω)W(t、ω)+(1−λs(t,ω))M(t−1,ω)として近似される、方法。
- 請求項1に記載の方法であって、時間領域に前記発話推定を変換する段階を更に有する、方法。
- 請求項1に記載の方法であって、ユーザに前記発話推定を出力する段階を更に有する、方法。
- 請求項1に記載の方法であって、前記フィルタ推定はウィーナフィルタに基づく、方法。
- 装置において発話を改善するシステムであって:
一次音響信号を受信する一次マイク;
前記一次マイクから距離を置いて位置付けられ、そして二次音響信号を受信する二次マイク;並びに
前記一次マイクにおいて受信された発話を改善する音声処理エンジンであって、
前記一次音響信号のエネルギー推定及びマイク間レベル差に基づいて前記一次音響信号について雑音推定を決定する雑音推定モジュールと、
フィルタリングされた音響信号を生成する一次音響信号に適用されるフィルタ推定を決定する第1モジュールであって、前記フィルタ推定は、前記一次音響信号の前記雑音推定、前記一次音響信号の前記エネルギー推定及び前記マイク間レベル差に基づいている、第1モジュールと、
を有する、音声処理エンジン;
を有するシステム。 - 請求項15に記載のシステムであって、前記音声処理エンジンは、前記一次音響信号及び前記二次音響信号のフレームについてエネルギー推定を決定するエネルギーモジュールを更に有する、システム。
- 請求項15に記載のシステムであって、前記音声処理エンジンは、前記マイク間レベル差を決定するマイク間レベル差モジュールを更に有する、システム。
- 請求項15に記載のシステムであって、前記音声処理エンジンは、前記一次音響信号に前記フィルタ推定を適用する前に、前記フィルタ推定を平滑化するフィルタ平滑化モジュールを更に有する、システム。
- 請求項15に記載のシステムであって、前記音声処理エンジンは、前記発話推定を決定するマスキングモジュールを更に有する、システム。
- プログラムを組み入れたコンピュータ読み出し可能媒体であって、前記プログラムは、装置において発話を改善する方法を実行する機械により実行される、コンピュータ読み出し可能媒体であり、前記方法は:
一次マイクにおいて一次音響信号を、そして二次マイクにおいて二次音響信号を受信する段階;
前記一次音響信号及び前記二次音響信号の各々についてのフレームにおいてエネルギー推定を決定する段階;
前記フレームについてマイク間レベル差を決定するように、前記エネルギー推定を用いる段階;
前記一次音響信号の前記エネルギー推定と、前記一次音響信号のエネルギー推定と、前記マイク間レベル差とに基づいて、雑音推定を生成する段階;
前記雑音推定及び前記マイク間レベル差に基づいて、フィルタ推定を演算する段階;並びに
発話推定を生成するように、前記一次音響信号に前記フィルタ推定を適用する段階;
を有する、コンピュータ読み出し可能媒体。
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US75682606P | 2006-01-05 | 2006-01-05 | |
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US11/343,524 US8345890B2 (en) | 2006-01-05 | 2006-01-30 | System and method for utilizing inter-microphone level differences for speech enhancement |
US11/343,524 | 2006-01-30 | ||
PCT/US2007/000463 WO2007081916A2 (en) | 2006-01-05 | 2007-01-05 | System and method for utilizing inter-microphone level differences for speech enhancement |
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- 2007-01-05 WO PCT/US2007/000463 patent/WO2007081916A2/en active Application Filing
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US9830899B1 (en) | 2006-05-25 | 2017-11-28 | Knowles Electronics, Llc | Adaptive noise cancellation |
JP2011527025A (ja) * | 2008-06-30 | 2011-10-20 | オーディエンス,インコーポレイテッド | ヌル処理雑音除去を利用した雑音抑制を提供するシステム及び方法 |
JP2013518477A (ja) * | 2010-01-26 | 2013-05-20 | オーディエンス,インコーポレイテッド | レベルキューによる適応ノイズ抑制 |
US9699554B1 (en) | 2010-04-21 | 2017-07-04 | Knowles Electronics, Llc | Adaptive signal equalization |
JP2013527493A (ja) * | 2010-04-29 | 2013-06-27 | オーディエンス,インコーポレイテッド | 複数のマイクによるロバストな雑音抑制 |
JP2014504743A (ja) * | 2010-12-29 | 2014-02-24 | テレフオンアクチーボラゲット エル エム エリクソン(パブル) | 雑音抑圧方法及び当該雑音抑圧方法を適用するための雑音抑圧器 |
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KR101984115B1 (ko) * | 2013-03-05 | 2019-05-31 | 프라운호퍼 게젤샤프트 쭈르 푀르데룽 데어 안겐반텐 포르슝 에.베. | 오디오 신호 처리를 위한 다채널 다이렉트-앰비언트 분해를 위한 장치 및 방법 |
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JP2020533619A (ja) * | 2017-08-17 | 2020-11-19 | セレンス オペレーティング カンパニー | 有音音声検出の複雑性低減およびピッチ推定 |
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US20070154031A1 (en) | 2007-07-05 |
US8867759B2 (en) | 2014-10-21 |
WO2007081916A3 (en) | 2007-12-21 |
US20130096914A1 (en) | 2013-04-18 |
JP5007442B2 (ja) | 2012-08-22 |
WO2007081916A2 (en) | 2007-07-19 |
US8345890B2 (en) | 2013-01-01 |
KR20080092404A (ko) | 2008-10-15 |
KR101210313B1 (ko) | 2012-12-10 |
US20160066088A1 (en) | 2016-03-03 |
FI20080428L (fi) | 2008-07-04 |
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