JP5597896B2 - 修正離散コサイン変換音声符号化器用の帯域幅拡大方法及び装置 - Google Patents
修正離散コサイン変換音声符号化器用の帯域幅拡大方法及び装置 Download PDFInfo
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Description
Claims (16)
- 第1周波数帯域内にスペクトルを備えた信号のための遷移帯域を設定することであって、前記遷移帯域が、前記第1周波数帯域の一部として設定され、前記遷移帯域が、前記第1周波数帯域に隣接する隣接周波数帯域の近傍に配置されている、前記遷移帯域を設定すること、
前記遷移帯域を解析して、遷移帯域スペクトル包絡線と、遷移帯域スペクトルデータとを得ること、
前記遷移帯域スペクトルデータを解析して、遷移帯域励起スペクトルを得ること、
前記遷移帯域スペクトルデータを用いて、隣接周波数帯域信号スペクトルを生成すること、
を含み、
前記遷移帯域スペクトルデータを用いて、隣接周波数帯域信号スペクトルを生成することが、
隣接周波数帯域スペクトル包絡線を評価すること、
前記遷移帯域スペクトルデータを用いて、隣接周波数帯域励起スペクトルを生成すること、
前記隣接周波数帯域スペクトル包絡線と、前記隣接周波数帯域励起スペクトルとを組み合わせて、前記隣接周波数帯域信号スペクトルを生成することを含み、
前記隣接周波数帯域スペクトル包絡線を評価することが、
前記遷移帯域スペクトルデータから遷移帯域エネルギを評価すること、
前記遷移帯域スペクトル包絡線の形状とゼロ交差値とに基づいて複数の非線形予測器 を用いて評価された前記遷移帯域エネルギから隣接周波数帯域エネルギを評価すること、
評価された前記隣接周波数帯域エネルギに基づいて隣接周波数帯域スペクトル包絡線を評価することを含む、方法。 - 前記遷移帯域スペクトルデータを用いて、隣接周波数帯域励起スペクトルを生成することが更に、
前記信号のピッチ周波数によって決定される繰返し周期を備えた、前記遷移帯域スペクトルの少なくとも一部の周期的繰返しによって、前記隣接周波数帯域励起スペクトルを生成することを含む、請求項1に記載の方法。 - 前記第1周波数帯域内のスペクトルと、前記隣接周波数帯域信号スペクトルを組み合わせて、帯域幅拡大信号スペクトルと、対応する帯域幅拡大信号を得ることを更に含む、請求項1に記載の方法。
- 前記隣接周波数帯域励起スペクトルを生成することが更に、前記遷移帯域励起スペクトルの少なくとも一部の周期的繰返しによって生成された前記隣接周波数帯域励起スペクトルと、前記隣接周波数帯域内の疑似雑音励起スペクトルとを混合することを含む、請求項2に記載の方法。
- 前記信号から評価した発声レベルを用いて、前記隣接周波数帯域励起スペクトルと、前記疑似雑音励起スペクトルとを混合する混合率を決定することを更に含む、請求項4に記載の方法。
- 前記疑似雑音励起スペクトルを用いて、前記遷移帯域励起スペクトル内の対応する割れ目に対して前記隣接周波数帯域励起スペクトル内の任意の割れ目を充填することを更に含む、請求項5に記載の方法。
- 第1周波数帯域内にスペクトルを備えた信号のための遷移帯域を設定することであって、前記遷移帯域が、第1周波数帯域の一部として設定され、前記遷移帯域が、前記第1周波数帯域に隣接する隣接周波数帯域の近傍に配置されている、前記遷移帯域を設定することと、
前記遷移帯域を解析して、遷移帯域スペクトル包絡線と、遷移帯域励起スペクトルとを得ること、
隣接周波数帯域スペクトル包絡線を評価すること、
前記信号のピッチ周波数によって決定される繰返し周期を備えた前記遷移帯域励起スペクトルの少なくとも一部の周期的繰返しによって、隣接周波数帯域励起スペクトルを生成すること、
前記隣接周波数帯域スペクトル包絡線と、前記隣接周波数帯域励起スペクトルとを組み合わせて、隣接周波数帯域信号スペクトルを得ること、
を含み、
前記隣接周波数帯域スペクトル包絡線を評価することが、
前記信号から遷移帯域エネルギを評価すること、
前記遷移帯域スペクトル包絡線の形状とゼロ交差値とに基づいて複数の非線形予測器 を用いて評価された前記遷移帯域エネルギから隣接周波数帯域エネルギを評価すること、
評価された前記隣接周波数帯域エネルギに基づいて隣接周波数帯域スペクトル包絡線を評価することを含む、方法。 - 前記第1周波数帯域内の前記スペクトルと、前記隣接周波数帯域信号スペクトルを組み合わせて、帯域幅拡大信号スペクトルと、対応する帯域幅拡大信号とを得ることを更に含む、請求項7に記載の方法。
- 前記隣接周波数帯域励起スペクトルを生成することが更に、前記遷移帯域励起スペクトルの少なくとも一部の周期的繰返しによって生成された前記隣接周波数帯域励起スペクトルと、前記隣接周波数帯域内の疑似雑音励起スペクトルとを混合することを含む、請求項8に記載の方法。
- 前記信号から評価した発声レベルを用いて、前記隣接周波数帯域励起スペクトルと、前記疑似雑音励起スペクトルとを混合する混合率を決定することを更に含む、請求項9に記載の方法。
- 前記疑似雑音励起スペクトルを用いて、前記遷移帯域励起スペクトル内の対応する割れ目に対して前記隣接周波数帯域励起スペクトル内の任意の割れ目を充填することを更に含む、請求項10に記載の方法。
- 第1周波数帯域内にスペクトルを備えた信号のための遷移帯域であって、前記遷移帯域が、前記第1周波数帯域の一部として設定され、前記遷移帯域が、前記第1周波数帯域に隣接する隣接周波数帯域の近傍に配置される、前記遷移帯域を設定し、
前記遷移帯域を解析して、遷移帯域スペクトル包絡線と、遷移帯域励起スペクトルとを取得し、
隣接周波数帯域スペクトル包絡線を評価し、
前記信号のピッチ周波数によって決定される繰返し周期を備えた前記遷移帯域励起スペクトルの少なくとも一部の周期的繰返しによって、隣接周波数帯域励起スペクトルを生成し、
前記隣接周波数帯域スペクトル包絡線と、前記隣接周波数帯域励起スペクトルとを組み合わせて、隣接周波数帯域信号スペクトルを得る
ように動作する信号処理論理部を含み、
前記隣接周波数帯域スペクトル包絡線を評価することが、
前記信号から遷移帯域エネルギを評価すること、
前記遷移帯域スペクトル包絡線の形状とゼロ交差値とに基づいて複数の非線形予測器 を用いて評価された前記遷移帯域エネルギから隣接周波数帯域エネルギを評価すること、
評価された前記隣接周波数帯域エネルギに基づいて隣接周波数帯域スペクトル包絡線を評価することを含む、装置。 - 前記信号処理論理部が、前記第1周波数帯域内の前記スペクトルと、前記隣接周波数帯域信号スペクトルを組み合わせて、帯域幅拡大信号スペクトルと、対応する帯域幅拡大信号とを得るように更に動作する、請求項12に記載の装置。
- 前記信号処理論理部が、前記遷移帯域励起スペクトルの少なくとも一部の周期的繰返しによって生成された前記隣接周波数帯域励起スペクトルと前記隣接周波数帯域内の疑似雑音励起スペクトルとを混合するように更に動作する、請求項12に記載の装置。
- 前記信号処理論理部が、前記信号から評価した発声レベルを用いて、前記隣接周波数帯域励起スペクトルと、前記疑似雑音励起スペクトルとを混合する混合率を決定するように更に動作する、請求項14に記載の装置。
- 前記信号処理論理部が、前記疑似雑音励起スペクトルを用いて、前記遷移帯域励起スペクトル内の対応する割れ目に対して前記隣接周波数帯域励起スペクトル内の任意の割れ目を充填するように更に動作する、請求項15に記載の装置。
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PCT/US2010/022879 WO2010091013A1 (en) | 2009-02-04 | 2010-02-02 | Bandwidth extension method and apparatus for a modified discrete cosine transform audio coder |
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