JP5666021B2 - 復号後オーディオ信号をスペクトル領域で処理する装置及び方法 - Google Patents
復号後オーディオ信号をスペクトル領域で処理する装置及び方法 Download PDFInfo
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Description
から、スケーリングされ低域通過フィルタ処理された長期誤差信号αeLT(n)を減算することに等価である。長期予測フィルタの伝達関数は、図9の最後の行に示されるように与えられる。この代わりの後処理構成が、図8に図示されている。値Tは、各サブフレーム内で受信された閉ループ・ピッチ・ラグ(ラグ=遅延)によって与えられる(ピッチラグの小数点以下は最も近い整数に丸められる)。ピッチ倍増を検査する単純な追跡が行われる。遅延T/2における正規化されたピッチ相関関係が0.95よりも大きい場合、後処理用の新たなピッチラグとして値T/2が用いられる。係数αは、α=0.5gpによって、ゼロ以上かつ0.5以下のαに制約されて与えられる。gpは、0と1の間に制限された復号後ピッチ利得である。TCXモード内では、αの値はゼロに設定される。大略500Hzのカットオフ周波数を有する25個の係数の直線位相FIR低域通過フィルタが用いられる。そのフィルタ遅延は、12サンプルである。減算を行う前に、2つの分岐内の信号を時間的にタイミングが合った状態にしておくために、上側の分岐は、下側の分岐内の処理遅延に対応する遅延を導入する必要がある。AMR−WB+では、Fs=2×コア・サンプリング・レートである。コア・サンプリング・レートは、12800Hzに等しい。上述のようにカットオフ周波数は、500Hzに等しい。
a[13]=[0.088250, 0.086410, 0.081074, 0.072768, 0.062294, 0.050623, 0.038774, 0.027692, 0.018130, 0.010578, 0.005221, 0.001946, 0.000385]
hLP(n)=a(13−n)、ここでnは1から12まで
hLP(n)=a(n−12)、ここでnは13から25まで
Y=QMF領域での後処理信号
X=QMF信号内にあるコア符号器からの復号後信号
E=TDで発生した、Xから除去すべき高調波間雑音
Y(k)=X(k)−W(k).E(k)、1から32までのkに対して
は問題が多い。これは、Tサンプルが現実の時間nに関して未来に存在するという事実に起因している。したがって、低遅延実装のゆえに未来の値がまだ利用できない状況に対処するために、
は、図10に示されるように、
で置き換える。次いで、長期予測フィルタは、先行技術の長期予測であって、しかし遅延が先行技術よりも小さい又はゼロの長期予測を概算する。概算は十分に良好であり、かつ低減された遅延に関して利得はピッチ強調処理におけるわずかな損失よりも有利であることが見いだされている。
Claims (16)
- 復号後オーディオ信号(100)を処理する装置であって、
前記復号後オーディオ信号をフィルタ処理して、フィルタ処理後のオーディオ信号(104)を得るフィルタ(102)と、
前記復号後オーディオ信号及び前記フィルタ処理後のオーディオ信号を、対応するスペクトル表現へ変換するステージであって、各スペクトル表現は複数のサブバンド信号を有する、時間−スペクトル変換部ステージ(106)と、
サブバンド信号にそれぞれの重み付け係数を掛けることによって、前記フィルタ処理後のオーディオ信号の前記スペクトル表現の周波数選択的な重み付けを行って、重み付けされたフィルタ処理後のオーディオ信号を得る重み付け部(108)と、
前記重み付けされたフィルタ処理後のオーディオ信号と前記オーディオ信号の前記スペクトル表現とのサブバンドに関する減算を行って、結果オーディオ信号を得る減算部(112)と、
前記結果オーディオ信号又は前記結果オーディオ信号から導き出された信号を時間領域表現に変換して、処理された復号後オーディオ信号(116)を得るスペクトル−時間変換部(114)と、を備えた装置。 - 前記結果オーディオ信号から導き出された前記信号を計算する、帯域幅強調復号器(129)又はモノラル−ステレオ復号器もしくはモノラル−マルチチャンネル復号器(131)をさらに備え、
前記スペクトル−時間変換部(114)は、前記結果オーディオ信号ではなく前記結果オーディオ信号から導き出された信号を前記時間領域へ変換するように構成され、前記帯域幅強調復号器(129)又は前記モノラル−ステレオ復号器もしくはモノラル−マルチチャンネル復号器(131)によるすべての処理が、時間−スペクトル変換部ステージ(106)によって定められたスペクトル領域と同一のスペクトル領域で行われるようにする請求項1に記載の装置。 - 前記復号後オーディオ信号はACELP復号後出力信号であり、
前記フィルタ(102)はピッチ情報によって制御される長期予測フィルタである請求項1又は2に記載の装置。 - 前記重み付け部(108)は、低域周波数サブバンドが高域周波数サブバンドよりも減衰が少なく又は減衰しないように前記フィルタ処理後のオーディオ信号を重み付けするように構成され、前記周波数選択的な重み付けが前記フィルタ処理後のオーディオ信号に対して低域通過特性を強調ようにする請求項1から3のいずれか1項に記載の装置。
- 前記時間−スペクトル変換部ステージ(106)及び前記スペクトル−時間変換部(114)は、それぞれQMF分析フィルタバンク及びQMF合成フィルタバンクを実装するように構成されている請求項1から4のいずれか1項に記載の装置。
- 前記減算部(112)は、前記重み付けされたフィルタ処理後のオーディオ信号のサブバンド信号を前記オーディオ信号の対応するサブバンド信号から減算して、前記結果オーディオ信号のサブバンドであって同一のフィルタバンクチャンネルに属するサブバンドを得るように構成されている請求項1から5のいずれか1項に記載の装置。
- 前記フィルタ(102)は、前記復号後オーディオ信号と、少なくとも、一ピッチ周期だけ時間的にシフトされた前記復号後オーディオ信号との重み付けされた組み合わせを行うように構成されている請求項1から6のいずれか1項に記載の装置。
- 前記フィルタ(102)は、前記復号後オーディオ信号と以前の時刻に存在していた前記復号後オーディオ信号とを組み合わせることだけによって、前記重み付けされた組み合わせを行うように構成されている請求項7に記載の装置。
- 前記スペクトル−時間変換部(114)は、サンプルレート変換が得られるように前記時間−スペクトル変換部ステージ(106)に関して異なる数の入力チャンネルを有し、前記スペクトル−時間変換部への入力チャンネルの数が前記時間−スペクトル変換部ステージの出力チャンネルの数よりも多いとアップサンプリングが得られ、前記スペクトル−時間変換部への入力チャンネルの数が前記時間−スペクトル変換部ステージからの出力チャンネルの数よりも少ないとダウンサンプリングが行われる請求項1から8のいずれか1項に記載の装置。
- 第1の時間部分に前記復号後オーディオ信号を提供する第1復号器(120)と、
異なる第2の時間部分にさらなる復号後オーディオ信号を提供する第2復号器(122)と、
前記第1復号器(120)及び前記第2復号器(122)に接続された第1処理分岐と、
前記第1復号器(120)及び前記第2復号器(122)に接続された第2処理分岐と、をさらに含み、
前記第2処理分岐は、前記フィルタ(102)及び前記重み付け部(108)を含み、さらに制御可能利得ステージ(129)及びコントローラ(130)を含み、
前記コントローラ(130)は、前記利得ステージ(129)の利得を、前記第1の時間部分用に第1値に設定し、前記第2の時間部分用に前記第1値よりも低い第2値又はゼロに設定するように構成されている請求項1から9の1項に記載の装置。 - ピッチラグを提供し、かつ前記ピッチ情報としての前記ピッチラグに基づいて前記フィルタ(102)を設定するピッチ追跡部をさらに備えている請求項3に記載の装置。
- 前記第1復号器(120)は、前記フィルタ(102)を設定するために、前記ピッチ情報又は前記ピッチ情報の一部を提供するように構成されている請求項11に記載の装置。
- 前記第1処理分岐の出力及び前記第2処理分岐の出力は、前記減算部(112)の入力に接続されている請求項10に記載の装置。
- 前記復号後オーディオ信号は、この装置に含まれるACELP復号器(120)によって提供され、
この装置は、TCX復号器として実装されたさらなる復号器(122)をさらに備えている請求項1から13のいずれか1項に記載の装置。 - 復号後オーディオ信号(100)を処理する方法であって、
前記復号後オーディオ信号をフィルタ処理して、フィルタ処理後のオーディオ信号(104)を得るステップ(102)と、
前記復号後オーディオ信号及び前記フィルタ処理後のオーディオ信号を、対応するスペクトル表現へ変換するステップであって、各スペクトル表現は複数のサブバンド信号を有するステップ(106)と、
サブバンド信号にそれぞれの重み付け係数を掛けることによって、前記フィルタ処理後のオーディオ信号の周波数選択的な重み付けを行って、重み付けされたフィルタ処理後のオーディオ信号を得るステップ(108)と、
前記重み付けされたフィルタ処理後のオーディオ信号と前記オーディオ信号の前記スペクトル表現とのサブバンドに関する減算を行って結果オーディオ信号を得るステップ(112)と、
前記結果オーディオ信号又は前記結果オーディオ信号から導き出された信号を時間領域表現に変換して処理された復号後オーディオ信号(116)を得るステップ(114)と、を含む方法。 - コンピュータに請求項15に記載の復号後オーディオ信号を処理する方法を実行させるためのコンピュータプログラム。
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KR20130133843A (ko) | 2013-12-09 |
MY164797A (en) | 2018-01-30 |
CA2827249C (en) | 2016-08-23 |
HK1192048A1 (en) | 2014-08-08 |
US20130332151A1 (en) | 2013-12-12 |
CA2827249A1 (en) | 2012-08-23 |
TW201237848A (en) | 2012-09-16 |
MX2013009344A (es) | 2013-10-01 |
AR085362A1 (es) | 2013-09-25 |
ES2529025T3 (es) | 2015-02-16 |
ZA201306838B (en) | 2014-05-28 |
SG192746A1 (en) | 2013-09-30 |
WO2012110415A1 (en) | 2012-08-23 |
RU2013142138A (ru) | 2015-03-27 |
BR112013020482A2 (pt) | 2018-07-10 |
PL2676268T3 (pl) | 2015-05-29 |
RU2560788C2 (ru) | 2015-08-20 |
AU2012217269A1 (en) | 2013-09-05 |
CN103503061B (zh) | 2016-02-17 |
EP2676268B1 (en) | 2014-12-03 |
US9583110B2 (en) | 2017-02-28 |
EP2676268A1 (en) | 2013-12-25 |
AU2012217269B2 (en) | 2015-10-22 |
KR101699898B1 (ko) | 2017-01-25 |
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TWI469136B (zh) | 2015-01-11 |
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