JP6185029B2 - オーディオコーデックにおけるノイズ生成 - Google Patents
オーディオコーデックにおけるノイズ生成 Download PDFInfo
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Description
[請求項1]
入力オーディオ信号のスペクトル分解表現に基づき、該入力オーディオ信号の背景ノイズのスペクトル包絡をスペクトル的に表わすパラメトリック背景ノイズ推定を決定する背景ノイズ推定器(12)と、
活性期の期間中に前記入力オーディオ信号をデータストリームへと符号化するための符号器(14)と、
前記入力オーディオ信号に基づいて前記活性期に続く不活性期の開始を検出する検出器(16)と、を備えたオーディオ符号器であって、
前記オーディオ符号器は、前記不活性期において前記パラメトリック背景ノイズ推定を前記データストリームへと符号化するように構成されており、
前記背景ノイズ推定器は、前記入力オーディオ信号のスペクトル分解表現における極小値を識別し、前記識別された極小値の間の補間を支持点として使用して前記入力オーディオ信号の背景ノイズのスペクトル包絡を推定するように構成されている、オーディオ符号器。
[請求項8]
入力オーディオ信号のスペクトル分解表現に基づき、該入力オーディオ信号の背景ノイズのスペクトル包絡をスペクトル的に表わすパラメトリック背景ノイズ推定を決定するステップと、
活性期の期間中に前記入力オーディオ信号をデータストリームへと符号化するステップと、
前記入力オーディオ信号に基づいて前記活性期に続く不活性期の開始を検出するステップと、
前記不活性期の期間中に前記パラメトリック背景ノイズ推定を前記データストリームへと符号化するステップと、を含むオーディオ符号化方法であって、
前記パラメトリック背景ノイズ推定を決定するステップは、前記入力オーディオ信号の前記スペクトル分解表現における極小値を識別し、前記識別された極小値の間の補間を支持点として使用して前記入力オーディオ信号の背景ノイズのスペクトル包絡を推定するステップを含む、オーディオ符号化方法。
Claims (8)
- 入力オーディオ信号のスペクトル分解表現に基づき、該入力オーディオ信号の背景ノイズのスペクトル包絡をスペクトル的に表わすパラメトリック背景ノイズ推定を決定する背景ノイズ推定器(12)と、
活性期の期間中に前記入力オーディオ信号をデータストリームへと符号化するための符号器(14)と、
前記入力オーディオ信号に基づいて前記活性期に続く不活性期の開始を検出する検出器(16)と、を備えたオーディオ符号器であって、
前記オーディオ符号器は、前記不活性期において前記パラメトリック背景ノイズ推定を前記データストリームへと符号化するように構成されており、
前記符号器は、前記入力オーディオ信号の符号化の際に、前記入力オーディオ信号を線形予測係数および励起信号へと予測符号化し、前記励起信号のスペクトル分解を変換符号化し、前記線形予測係数を前記データストリームへと符号化するように構成され、
前記背景ノイズ推定器は、前記パラメトリック背景ノイズ推定の決定の際に、前記入力オーディオ信号の前記スペクトル分解表現として前記励起信号の前記スペクトル分解を使用するように構成されている、オーディオ符号器。 - 前記背景ノイズ推定器は、前記活性期において、前記入力オーディオ信号の前記スペクトル分解表現内のノイズ成分と有用な信号成分との間の区別を行ない、前記ノイズ成分だけから前記パラメトリック背景ノイズ推定を決定することで、前記パラメトリック背景ノイズ推定の決定を実行する、請求項1に記載のオーディオ符号器。
- 前記符号器は、前記入力オーディオ信号の符号化の際に、前記入力オーディオ信号の前記スペクトル分解表現の低周波部分の符号化に予測及び/又は変換符号化を使用し、前記入力オーディオ信号の前記スペクトル分解表現の高周波部分のスペクトル包絡の符号化にパラメトリック符号化を使用するように構成されている、請求項1又は2に記載のオーディオ符号器。
- 前記符号器は、前記入力オーディオ信号の符号化において、前記入力オーディオ信号の前記スペクトル分解表現の低周波部分の符号化に予測及び/又は変換符号化を使用するとともに、パラメトリック符号化を使用して前記入力オーディオ信号の前記スペクトル分解表現の高周波部分のスペクトル包絡を符号化するか、又は前記入力オーディオ信号の前記高周波部分を符号化しないかを選択するように構成されている、請求項1〜3のいずれか一項に記載のオーディオ符号器。
- 前記符号器は、不活性期において、前記予測及び/又は変換符号化と前記パラメトリック符号化とを中断するか、あるいは予測及び/又は変換符号化を中断し、かつ前記入力オーディオ信号の前記スペクトル分解表現の前記高周波部分のスペクトル包絡のパラメトリック符号化を、前記活性期における前記パラメトリック符号化の使用と比べて低い時間/周波数分解能で実行するかのいずれかである、請求項3又は4に記載のオーディオ符号器。
- 前記符号器は、前記入力オーディオ信号を、前記低周波部分を形成する一組のサブバンドおよび前記高周波部分を形成する一組のサブバンドへとスペクトル的に分解するために、フィルタバンクを使用する、請求項3〜5のいずれか一項に記載のオーディオ符号器。
- 入力オーディオ信号のスペクトル分解表現に基づき、該入力オーディオ信号の背景ノイズのスペクトル包絡をスペクトル的に表わすパラメトリック背景ノイズ推定を決定するステップと、
活性期の期間中に前記入力オーディオ信号をデータストリームへと符号化するステップと、
前記入力オーディオ信号に基づいて前記活性期に続く不活性期の開始を検出するステップと、
前記不活性期の期間中に前記パラメトリック背景ノイズ推定を前記データストリームへと符号化するステップと、を含むオーディオ符号化方法であって、
前記入力オーディオ信号を符号化するステップは、前記入力オーディオ信号を線形予測係数および励起信号へと予測符号化し、前記励起信号のスペクトル分解を変換符号化し、前記線形予測係数を前記データストリームへと符号化するステップを含み、
前記パラメトリック背景ノイズ推定を決定するステップは、前記パラメトリック背景ノイズ推定の決定の際に、前記入力オーディオ信号の前記スペクトル分解表現として前記励起信号の前記スペクトル分解を使用することを含む、オーディオ符号化方法。 - コンピュータ上での実行時に請求項7に記載の方法を実行するためのプログラムコードを有するコンピュータプログラム。
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