JP2016527557A - 符号化オーディオ信号の復号装置、方法およびコンピュータプログラム - Google Patents
符号化オーディオ信号の復号装置、方法およびコンピュータプログラム Download PDFInfo
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Abstract
Description
midNrg[k]=leftNrg[k]+rightNrg[k];
sideNrg[k]=eftNrg[k]−rightNrg[k];
ここで、kは変形領域における周波数指数である。
midTile[k]=0.5・(leftTile[k]+rightTile[k]
sideTile[k]=0.5・(leftTile[k]−rightTile[k]
エネルギ調整:
midTile[k]=midTile[k]*midNrg[k];
sideTile[k]=sideTile[k]*sideNrg[k];
ジョイントステレオ→LR変換:
何ら追加的予測パラメータが符号化されていない場合:
leftTile[k]=midTile[k]+sideTile[k]
rightTile[k]=midTile[k]−sideTile[k]
追加的な予測パラメータが必要な場合で、信号化された方向性がミッドからサイドの場合:
sideTile[k]=sideTile[k]−predictionCoeff・midTile[k]
leftTile[k]=midTile[k]+sideTile[k]
rightTile[k]=midTile[k]−sideTile[k]
信号化された方向性がサイドからミッドの場合:
midTile1[k]=midTile[k]−predictionCoeff・sideTile[k]
leftTile[k]=midTile1[k]−sideTile[k]
rightTile[k]=midTile1[k]+sideTile[k]
に従って生成される。
・全帯域コア符号化
・インテリジェントギャップ充填(タイル充填またはノイズ充填)
・音調マスクにより選択されたコア内におけるまばらな音調部分
・充填を含む、全帯域のためのジョイントステレオペア符号化
・タイル上のTNS
・IGFレンジにおけるスペクトル白色化
により特徴付けられる。ここで、0≦Xbias≦Nであり、
Xbias=0のとき、双方のフィルタの合計が1に等しく、そのフィルタにはノッチフィルタ特性はない。
Xbias=Nのとき、双方のフィルタは完全に零である。
Claims (17)
- 符号化コア信号とパラメトリックデータとを含む符号化オーディオ信号を復号する復号装置において、
前記符号化コア信号を復号して復号化コア信号を得るコアデコーダ(600)と、
周波数再生動作の前または後に前記復号化コア信号を解析して解析結果(603)を得るアナライザ(602)と、
前記復号化コア信号のスペクトル部、前記パラメトリックデータ(605)および前記解析結果(603)を使用して、前記復号化コア信号に含まれないスペクトル部を再生成する周波数再生成器と
を備える復号装置。 - 請求項1に記載の復号装置において、
前記アナライザ(614)は、周波数再生動作の前または後の前記復号化コア信号を解析して、前記復号化コア信号内に1以上の局所スペクトル極小を見つけ、その局所スペクトル極小を識別する解析結果(603)を提供する構成であり、
前記周波数再生成器(504,616)は、スペクトル部を再生する構成であり、
復号化信号のスペクトル部内または再生スペクトル部内の周波数タイルの境界が、前記1以上の局所スペクトル極小に設定される
ことを特徴とする復号装置。 - 請求項1に記載の復号装置において、
前記周波数再生成器(604)は、予備再生信号(703)を生成する構成であり、
前記アナライザ(602)は、前記予備再生信号を解析して、アーティファクトが作り出した信号部を検出する構成であり、
前記周波数再生成器(604)はさらに、前記予備再生信号に含まれる前記アーティファクトが作り出した信号部を削減または除去するため、前記予備再生信号を操作、または前記予備再生信号のパラメータとは異なるパラメータを用いてさらに再生を実行するマニピュレータ(722)を有する
ことを特徴とする復号装置。 - 請求項1から3のいずれか1項に記載の復号装置において、
前記周波数再生成器(604)は、前記復号化コア信号のスペクトル部を用いて前記復号化コア信号内に含まれないスペクトル部を有する予備再生信号(703)を再生して、再生スペクトル部を得る構成であり、
前記周波数再生成器(604)は、前記復号化コア信号と前記再生スペクトル部との間の周波数境界の近くの、または前記周波数再生成器(604)を用いて生成された2つの再生スペクトル部または前記復号化コア信号の異なるスペクトル部の間の周波数境界の近くの、アーティファクトが作り出した信号部を検出する構成であり、
前記周波数再生成器(604)はさらに、前記予備再生信号生成するために使用する制御データとは異なる操作された制御データを使用して再生信号を新たに生成するため、前記予備再生信号または制御データを操作するマニピュレータ(722)を有する
ことを特徴とする復号装置。 - 請求項4に記載の復号装置において、
前記周波数再生成器(604)は、前記復号化コア信号の1以上のスペクトル部を用いて前記スペクトル部を引き出し、生のスペクトル部を得るタイル生成器(820)を有し、
前記マニピュレータ(824)は、前記生のスペクトル部または前記周波数タイル生成器(820)を操作して、操作されたスペクトル部を得るように構成され、
前記周波数再生成器(604)はさらに、前記パラメトリックデータ(605)を用いて前記操作されたスペクトル部の包絡線調整を行うように構成されたスペクトル包絡線調整器(826)を有する
ことを特徴とする復号装置。 - 請求項1から5のいずれか1項に記載の復号装置において、
前記アナライザ(602)は、周波数検出範囲内にあるトーン信号部を検出する構成であり、その周波数検出範囲は、再構築範囲の周波数境界から所定の帯域幅だけ延びる、または再構築範囲内の隣接周波数タイルの間の、所定の帯域幅の範囲であり、この所定の帯域幅は、ソース周波数レンジまたは再構築周波数レンジの帯域幅の20%未満、または1バークである
ことを特徴とする復号装置。 - 請求項6に記載の復号装置において、前記マニピュレータ(824)は、前記所定の帯域幅内で、前記再生信号内のトーン部を含むスペクトル部を減衰させる、または取り除く(708)ように構成されていることを特徴とする復号装置。
- 請求項7に記載の復号装置において、前記マニピュレータ(722,824)は、前記トーン信号(802)の開始周波数にある開始スペクトル部と、前記トーン信号(802)の終了周波数にある終了スペクトル部と、を判定し、前記開始周波数と前記終了周波数との間に内挿(804)して内挿信号部を取得し、前記開始周波数と前記終了周波数との間のトーン部を前記内挿信号部(806)で置き替えることを特徴とする復号装置。
- 請求項7に記載の復号装置において、前記マニピューレータ(822)は、ランダムに、または非ランダムに、前記復号化コア信号の非トーン信号部または前記再生スペクトル部(810)の非トーン信号部により決定されるエネルギを有するスペクトル線(808)を生成することを特徴とする復号装置。
- 請求項4から9のいずれか1項に記載の復号装置において、
前記アナライザは、ある特定の周波数のアーティファクトが作り出した信号部を検出する構成であり、
前記マニピュレータ(722,824)は、タイル生成器が前記復号化コア信号のスペクトル部の周波数境界または再生スペクトル部の周波数境界を変化させるように前記タイル生成器を制御して、アーティファクトが作り出した信号部がアーティファクトをほとんど、または全く、引き起こさないようにする
ことを特徴とする復号装置。 - 請求項1から10のいずれか1項に記載の復号装置において、
前記アナライザ(602)は、前記復号化コア信号のスペクトル部内または再生信号内のピーク部の中間スプリットを、前記復号化コア信号の周波数境界、またはそれを用いて生成された2つの再生スペクトル部または前記復号化コア信号の異なるスペクトル部または前記再生され前記再生信号の異なるスペクトル部の間の周波数境界で検出する構成であり、
前記周波数再生成器は、前記復号化コア信号と前記再生信号との間の周波数境界、またはそれを用いて生成された2つの再生スペクトル部または前記復号化コア信号の異なるスペクトル部の間の周波数境界を変更するか、または、最大周波数を変更し、スプリッティングを削減または除去する構成である
ことを特徴とする復号装置。 - 請求項1から11のいずれか1項に記載の復号装置において、
前記周波数再生器(604)は、前記復号化コア信号の同じまたは異なるスペクトル部を用いて、前記復号化コア信号の第1スペクトル部に対する第1周波数タイルおよび第2スペクトル部に対する第2周波数タイルを生成するタイル生成器(820)を有し、
前記アナライザ(602)は、ピークスペクトル部が前記第2周波数タイルの下側周波数境界によりクリップされているか、あるいは前記第1周波数タイルの上側周波数境界によりクリップされているか、あるいは前記第1周波数タイルと前記復号化コア信号の所定のギャップ充填開始周波数(309)との下側周波数境界によりクリップされているかを検出する構成であり、
前記マニピュレータ(824)は、クリッピングが削減または除去されるように修正された開始または停止周波数境界を有する修正周波数タイルを生成するように、前記タイル生成器(820)を制御する構成である
ことを特徴とする復号装置。 - 請求項1から12のいずれか1項に記載の復号装置において、
前記コアデコーダは、ゼロ表現とは異なるスペクトル値により表現される第1セットの第1スペクトル部を含む周波数領域復号化スペクトル部を得る構成であり、
第2セットの第2スペクトル部はスペクトル値に対してゼロ表現により表現され、
パラメトリック情報が前記第2セットの前記第2スペクトル部に対して提供され、
前記周波数再生器(604)は、前記第1セットのスペクトル部から復号化されたスペクトル部を用いて、前記第1セットのスペクトル部に含まれない再構築帯域内のスペクトル部を再生するように構成され、
前記復号装置はさらに、再生されたスペクトル部と前記復号化コア信号のスペクトル部とを時間表現に変換する周波数時間変換器(828)を備える
ことを特徴とする復号装置。 - 請求項1から13のいずれか1項に記載の復号装置において、
前記コアデコーダ(600)は、修正離散コサイン変換(MDCT)スペクトル値を出力する構成であり、
前記周波数時間変換器(828)は、オーバーラップ加算処理をその後に得られるMDCTフレームに加える逆MDCT変換((512,514,516)を実行するためのプロセッサを備える
ことを特徴とする復号装置。 - 請求項1から14のいずれか1項に記載の復号装置において、
前記周波数再生器(604)は、予備再生された信号を生成(702)する構成であり、
前記周波数再生器(604)は、前記予備再生された信号内のトーン成分を検出(704)する構成であり、
前記周波数再生器は、ソースレンジと再構成レンジとの間、または再構成されたレンジ内の隣接周波数タイル間の遷移周波数を、前記検出(704)の結果に基づいて調整し、再生信号を生成する構成であり、
前記再生器はさらに、前記遷移周波数の周りの検出レンジ内にあるトーン成分を除去する(708)構成であり、
前記周波数再生器はさらに、前記パラメトリックデータ(605)を用いるクロスフィルタの結果をスペクトル包絡線整形するスペクトル波形整形器(712)を有する
ことを特徴とする復号装置。 - 符号化コア信号とパラメトリックデータとを含む符号化オーディオ信号を復号する方法において、
周波数再生操作を実行する前または後に前記符号化コア信号を解析(604)して解析結果(603)を提供し、
前記復号化コア信号のスペクトル部、前記パラメトリックデータ(605)、および前記解析結果(603)を用いて、前記復号化コア信号に含まれないスペクトル部を再生(604)する
復号方法。 - コンピュータまたはプロセッサで動作するとき、請求項16に記載の方法を実行するコンピュータプログラム。
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