JP2006087082A - 多感覚音声強調のための方法および装置 - Google Patents
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- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
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Abstract
【解決手段】 本発明にかかる方法および装置は、代替センサ信号と気導マイクロフォン信号を使用して、代替センサについてチャネル応答を決定する。次いで、このチャネル応答を使用し、代替センサ信号の少なくとも一部分を使用して雑音のない話声値を推定する。
【選択図】 図3
Description
y(t)=x(t)+z(t) 式1
b(t)=h(t)・x(t)+w(t) 式2
という雑音のない話声信号と、気導マイクロフォン信号および代替センサ信号との間のモデルとなり、上式で、y(t)は気導マイクロフォン信号であり、b(t)は代替センサ信号であり、x(t)は雑音のない話声信号であり、z(t)は背景話声と周囲雑音を含む組合せ雑音信号であり、w(t)は代替センサ雑音であり、h(t)は、代替センサに関連する雑音のない話声信号に対するチャネル応答である。したがって、式2では、代替センサ信号は、雑音のない話声信号のフィルタされたバージョンとしてモデル化され、フィルタは、h(t)のインパルス応答を有する。
Yt(k)=Xt(k)+Zt(k) 式3
Bt(k)=Ht(k)Xt(k)+Wt(k) 式4
として表すことができ、上式で、Yt(k)は、時間tを中心とする信号のフレームのk番目の周波数成分を表す。この表記法は、Xt(k)、Zt(k)、Ht(k)、Wt(k)、Bt(k)にも適用される。以下の考察では、見やすくするために、周波数成分kに対する参照が省略される。しかし、以下で実施される計算は周波数成分ごとに実施されることを、当業者なら理解するであろう。
S(T)=cS’(T−1)+sT 式17
として帰納的に推定される。
Yt(k)=Xt(k)+Vt(k)+Ut(k) 式25
Bt(k)=Ht(k)Xt(k)+Gt(k)Vt(k)+Wt(k) 式26
としてモデル化され、上式で、雑音Zt(k)は、背景話声Vt(k)と周囲雑音Ut(k)に分離されており、背景話声に対する代替センサチャネル応答は、Gt(k)の非ゼロ値である。
304 気導マイクロフォン
306 代替センサ
310 周囲雑音U
314 背景話者
320 センサ雑音W
322 直接フィルタリング強調
328 音声処理
Claims (26)
- 雑音が低減された話声信号の一部分を表す雑音低減値についての推定値を決定する方法であって、
気導マイクロフォン以外の代替センサを使用して、代替センサ信号を生成するステップと、
気導マイクロフォン信号を生成するステップと、
前記代替センサ信号と前記気導マイクロフォン信号を使用し、前記代替センサ信号のチャネル応答についての値を推定するステップと、
前記チャネル応答を使用し、前記雑音低減値を推定するステップとを含むことを特徴とする方法。 - チャネル応答についての値を推定するステップは、目的関数の末端を見つけるステップを含むことを特徴とする請求項1に記載の方法。
- チャネル応答を推定するステップは、前記チャネル応答と重畳され、その結果が雑音項と合計された、雑音のない話声信号として前記代替センサ信号をモデル化するステップを含むことを特徴とする請求項1に記載の方法。
- 前記チャネル応答は、雑音のない話声信号に対するチャネル応答を含むことを特徴とする請求項1に記載の方法。
- 背景話声信号に対する代替センサのチャネル応答を決定するステップをさらに含むことを特徴とする請求項4に記載の方法。
- 前記チャネル応答を使用し、前記雑音低減値を推定するステップは、前記雑音のない話声信号に対する前記チャネル応答と、前記背景話声信号に対する前記チャネル応答とを使用し、前記雑音低減値を推定するステップを含むことを特徴とする請求項5に記載の方法。
- 前記雑音低減値の前記推定値を使用し、背景話声信号についての値を推定するステップをさらに含むことを特徴とする請求項1に記載の方法。
- チャネル応答についての値を推定するステップは、前記代替センサ信号および前記気導マイクロフォン信号の一連のフレームを使用し、前記一連のフレーム内の前記フレームについて単一のチャネル応答値を推定するステップを含むことを特徴とする請求項1に記載の方法。
- 前記チャネル応答を使用し、雑音低減値を推定するステップは、前記一連のフレーム内の各フレームについて別々の雑音低減値を推定するステップを含むことを特徴とする請求項8に記載の方法。
- チャネル応答についての値を推定するステップは、現在のフレーム内の前記代替センサ信号および前記気導マイクロフォン信号についての値を、先のフレーム内の前記代替センサ信号および前記気導マイクロフォン信号についての値より重く加重することによって、前記現在のフレームについての前記値を推定するステップを含むことを特徴とする請求項1に記載の方法。
- 代替センサ信号と気導マイクロフォン信号を使用して、代替センサについてのチャネル応答を決定するステップと、
前記チャネル応答を使用し、前記代替センサ信号の少なくとも一部分を使用して雑音のない話声値を推定するステップと
を含むステップを実施するためのコンピュータ実行可能命令を有することを特徴とするコンピュータ可読媒体。 - チャネル応答を決定するステップは、前記代替センサ信号および前記気導マイクロフォン信号の一連のフレームについて単一のチャネル応答を決定するステップを含むことを特徴とする請求項11に記載のコンピュータ可読媒体。
- 前記チャネル応答は、雑音のない話声信号に対するチャネル応答を含むことを特徴とする請求項11に記載のコンピュータ可読媒体。
- 背景話声信号に対するチャネル応答を決定するステップをさらに含むことを特徴とする請求項13に記載のコンピュータ可読媒体。
- 前記雑音のない話声信号に対する前記チャネル応答と共に前記背景話声信号に対する前記チャネル応答を使用し、前記雑音のない話声値を推定するステップをさらに含むことを特徴とする請求項14に記載のコンピュータ可読媒体。
- 前記雑音のない話声値を使用し、背景話声値を推定するステップをさらに含むことを特徴とする請求項11に記載のコンピュータ可読媒体。
- 雑音のない話声信号を識別する方法であって、
代替センサ信号内の雑音を説明する雑音パラメータを推定するステップと、
前記雑音パラメータを使用し、代替センサについてチャネル応答を推定するステップと、
前記チャネル応答を使用し、前記雑音のない話声信号についての値を推定するステップとを含むことを特徴とする方法。 - 雑音パラメータを推定するステップは、前記代替センサ信号を使用し、ユーザが話をしていない期間を識別するステップを含むことを特徴とする請求項17に記載の方法。
- 前記ユーザが話をしていない前記期間に関連する気導マイクロフォン信号の一部分に対して話声検出を実施し、非話声期間および背景話声期間を識別するステップをさらに含むことを特徴とする請求項18に記載の方法。
- 前記非話声期間に関連する前記代替センサ信号の一部分を使用し、前記雑音パラメータを推定するステップをさらに含むことを特徴とする請求項19に記載の方法。
- 前記非話声期間を使用し、前記気導マイクロフォン信号内の雑音を説明する雑音パラメータを推定するステップをさらに含むことを特徴とする請求項20に記載の方法。
- 前記背景話声期間に関連する前記代替センサ信号の前記一部分を使用し、背景話声に対するチャネル応答を推定するステップをさらに含むことを特徴とする請求項20に記載の方法。
- 背景話声に対する前記チャネル応答を使用し、雑音のない話声を推定するステップをさらに含むことを特徴とする請求項22に記載の方法。
- 背景話声値の推定値を決定するステップをさらに含むことを特徴とする請求項17に記載の方法。
- 背景話声値の推定値を決定するステップは、前記雑音のない話声値の前記推定値を使用し、前記背景話声値を推定するステップを含むことを特徴とする請求項24に記載の方法。
- 前記チャネル応答の従来のモデルを使用し、前記雑音のない話声値を推定するステップをさらに含むことを特徴とする請求項17に記載の方法。
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US10/944,235 US7574008B2 (en) | 2004-09-17 | 2004-09-17 | Method and apparatus for multi-sensory speech enhancement |
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CA2513195C (en) | 2013-12-03 |
MXPA05008740A (es) | 2007-12-11 |
KR101153093B1 (ko) | 2012-06-11 |
EP1638084A1 (en) | 2006-03-22 |
CN100583243C (zh) | 2010-01-20 |
AU2005202858A1 (en) | 2006-04-06 |
ATE448541T1 (de) | 2009-11-15 |
CN1750123A (zh) | 2006-03-22 |
JP4842583B2 (ja) | 2011-12-21 |
DE602005017549D1 (de) | 2009-12-24 |
US7574008B2 (en) | 2009-08-11 |
CA2513195A1 (en) | 2006-03-17 |
EP1638084B1 (en) | 2009-11-11 |
KR20060048954A (ko) | 2006-05-18 |
US20060072767A1 (en) | 2006-04-06 |
RU2005127419A (ru) | 2007-03-10 |
RU2389086C2 (ru) | 2010-05-10 |
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