JP5849106B2 - 低遅延の統合されたスピーチ及びオーディオ符号化におけるエラー隠しのための装置及び方法 - Google Patents
低遅延の統合されたスピーチ及びオーディオ符号化におけるエラー隠しのための装置及び方法 Download PDFInfo
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Description
Claims (16)
- オーディオ信号のスペクトル置換値を生成する装置(100)であって、
先行して受信されたエラー無しのオーディオフレームに関連する先行スペクトル値を記憶するバッファユニット(110)と、
現在のオーディオフレームが受信不完全である場合やエラーを含む場合に、スペクトル置換値を生成する隠しフレーム生成部(120)と、を備え、
前記先行して受信されたエラー無しのオーディオフレームはフィルタ情報を含み、前記フィルタ情報には予測フィルタの安定度を示すフィルタ安定度値が関連付けられており、前記隠しフレーム生成部(120)は、前記先行スペクトル値に基づきかつ前記フィルタ安定度値に基づいて、前記スペクトル置換値を生成するよう構成されている、装置。 - 請求項1に記載の装置(100)であって、前記隠しフレーム生成部(120)は、前記先行スペクトル値の正負符号をランダムにフリップさせることで、前記スペクトル置換値を生成するよう構成されている、装置。
- 請求項1又は2に記載の装置(100)であって、前記隠しフレーム生成部(120)は、前記フィルタ安定度値が第1の値を持つ場合には、前記先行スペクトル値の各々を第1ゲインファクタで乗算し、前記フィルタ安定度値が前記第1の値よりも小さい第2の値を持つ場合には、前記先行スペクトル値の各々を前記第1ゲインファクタよりも小さい第2ゲインファクタで乗算することによって、前記スペクトル置換値を生成するよう構成されている、装置。
- 請求項1乃至3のいずれか1項に記載の装置であって、前記隠しフレーム生成部(120)は、前記フィルタ安定度値に基づいて前記スペクトル置換値を生成するよう構成されており、前記先行して受信されたエラー無しのオーディオフレームが前記予測フィルタの第1予測フィルタ係数を含み、当該先行して受信されたエラー無しのオーディオフレームよりも更に以前のフレームが第2予測フィルタ係数を含み、前記フィルタ安定度値は前記第1予測フィルタ係数と前記第2予測フィルタ係数とに依存している、装置。
- 請求項4に記載の装置であって、前記隠しフレーム生成部(120)は、前記先行して受信されたエラー無しのオーディオフレームの前記第1予測フィルタ係数に基づき、かつ当該先行して受信されたエラー無しのオーディオフレームよりも更に以前のフレームの前記第2予測フィルタ係数に基づいて、前記フィルタ安定度値を決定するよう構成されている、装置。
- 請求項4又は5に記載の装置であって、前記隠しフレーム生成部(120)は、前記フィルタ安定度値に基づいて前記スペクトル置換値を生成するよう構成され、前記フィルタ安定度値は距離の測度LSFdistに依存しており、当該距離の測度LSFdistは次式により定義され、
- 請求項1乃至6のいずれか1項に記載の装置(100)であって、前記隠しフレーム生成部(120)は、前記先行して受信されたエラー無しのオーディオフレームに関するフレーム分類情報にさらに基づいて、前記スペクトル置換値を生成するよう構成されている、装置。
- 請求項7に記載の装置(100)であって、前記隠しフレーム生成部(120)は前記フレーム分類情報に基づいて前記スペクトル置換値を生成するよう構成されており、前記フレーム分類情報は、前記先行して受信されたエラー無しのオーディオフレームが「人工的なオンセット」、「オンセット」、「発声された遷移」、「発声されない遷移」、「発声されない」又は「発声された」として分類される、装置。
- 請求項1乃至8のいずれか1項に記載の装置(100)であって、前記隠しフレーム生成部(120)は、最後のエラー無しのオーディオフレームが受信機に到着した後の、受信機に到着しなかった又はエラーを含んでいた連続的なフレームの数にさらに基づいて、前記スペクトル置換値を生成するよう構成されており、このとき、前記最後のエラー無しのオーディオフレームが前記受信機に到着した後には他のエラー無しのオーディオフレームが前記受信機に全く到着していない、装置。
- 請求項9に記載の装置(100)であって、
前記隠しフレーム生成部(120)は、前記フィルタ安定度値に基づいて、かつ前記受信機に到着しなかった又はエラーを含んでいた連続的なフレームの数に基づいて、フェードアウトファクタを計算するよう構成されており、
前記隠しフレーム生成部(120)は、前記フェードアウトファクタに、前記先行スペクトル値のうちの少なくとも幾つかを乗算すること、又は中間値のグループ内の少なくとも幾つかの値を乗算することで、前記スペクトル置換値を生成するよう構成されており、ここで前記中間値の各々は前記先行スペクトル値の少なくとも1つに依存する、装置。 - 請求項1乃至10のいずれか1項に記載の装置(100)であって、前記隠しフレーム生成部(120)は、前記先行スペクトル値と、前記フィルタ安定度値と、時間的ノイズ成形の予測ゲインとに基づいて、前記スペクトル置換値を生成するよう構成されている、装置。
- オーディオ信号復号器であって、
スペクトルオーディオ信号値を復号化する装置(610)と、
請求項1乃至11のいずれか1項に従ってスペクトル置換値を生成する装置(620)と、を備え、
前記スペクトルオーディオ信号値を復号化する装置(610)は、先行して受信されたエラー無しのオーディオフレームに基づいてオーディオ信号のスペクトル値を復号化するよう構成され、更に前記スペクトルオーディオ信号値を復号化する装置(610)は、前記スペクトル置換値を生成する装置(620)のバッファユニット内のオーディオ信号のスペクトル値を記憶するよう構成され、
前記スペクトル置換値を生成する装置(620)は、現在のオーディオフレームが受信不完全であるか又はエラーを含む場合に、前記バッファユニットに記憶された前記スペクトル値に基づいて前記スペクトル置換値を生成するよう構成されている、オーディオ信号復号器。 - オーディオ信号復号器であって、
受信されたエラー無しのフレームに基づいて第1中間スペクトル値を生成する復号化ユニット(710)と、
前記第1中間スペクトル値に対して時間的ノイズ成形を実行して第2中間スペクトル値を得る時間的ノイズ成形ユニット(720)と、
前記第1中間スペクトル値と前記第2中間スペクトル値とに依存して前記時間的ノイズ成形の予測ゲインを計算する予測ゲイン計算部(730)と、
現在のオーディオフレームが受信不完全であるか又はエラーを含む場合に、請求項1乃至11のいずれか1項に従ってスペクトル置換値を生成する装置(740)と、
前記予測ゲインが閾値以上である場合には、前記スペクトル置換値を生成する装置(740)のバッファユニット(745)内に前記第1中間スペクトル値を記憶し、予測ゲインが前記閾値未満である場合には、前記スペクトル置換値を生成する装置の前記バッファユニット内に前記第2中間スペクトル値を記憶する、値選択部(750)と、
を備えるオーディオ信号復号器。 - オーディオ信号復号器であって、
受信されたエラー無しのオーディオフレームに基づいて生成済みのスペクトル値を生成する第1復号化モジュール(810)と、
請求項1乃至11のいずれか1項に従ってスペクトル置換値を生成する装置(820)と、
時間的ノイズ成形を実行し、ノイズ充填を適用し又はグローバルゲインを適用することによって、前記生成済みのスペクトル値を処理し、復号化されたオーディオ信号のスペクトルオーディオ値を得る、処理モジュール(830)と、を備え、
現在のフレームが受信不完全である又はエラーを含む場合には、前記スペクトル置換値を生成する装置(820)がスペクトル置換値を生成し、かつそれらスペクトル置換値を前記処理モジュール(830)へと供給するよう構成されている、オーディオ信号復号器。 - オーディオ信号のスペクトル置換値を生成する方法であって、
先行して受信されたエラー無しのオーディオフレームに関連する先行スペクトル値を記憶するステップと、
現在のオーディオフレームが受信不完全である場合やエラーを含む場合に、スペクトル置換値を生成するステップであって、前記先行して受信されたエラー無しのオーディオフレームはフィルタ情報を含み、前記フィルタ情報には当該フィルタ情報により定義される予測フィルタの安定度を示すフィルタ安定度値が関連付けられており、前記スペクトル置換値は、前記先行スペクトル値に基づきかつ前記フィルタ安定度値に基づいて生成される、方法。 - コンピュータ又は信号処理器によって実行されたとき、請求項15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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CA2827000A1 (en) | 2012-08-23 |
RU2630390C2 (ru) | 2017-09-07 |
EP2661745A1 (en) | 2013-11-13 |
WO2012110447A1 (en) | 2012-08-23 |
AU2012217215A1 (en) | 2013-08-29 |
AR085218A1 (es) | 2013-09-18 |
CN103620672B (zh) | 2016-04-27 |
PL2661745T3 (pl) | 2015-09-30 |
HK1191130A1 (en) | 2014-07-18 |
BR112013020324A2 (pt) | 2018-07-10 |
EP2661745B1 (en) | 2015-04-08 |
BR112013020324B8 (pt) | 2022-02-08 |
KR101551046B1 (ko) | 2015-09-07 |
TWI484479B (zh) | 2015-05-11 |
US9384739B2 (en) | 2016-07-05 |
RU2013142135A (ru) | 2015-03-27 |
ZA201306499B (en) | 2014-05-28 |
KR20140005277A (ko) | 2014-01-14 |
SG192734A1 (en) | 2013-09-30 |
AU2012217215B2 (en) | 2015-05-14 |
TW201248616A (en) | 2012-12-01 |
US20130332152A1 (en) | 2013-12-12 |
MX2013009301A (es) | 2013-12-06 |
BR112013020324B1 (pt) | 2021-06-29 |
CN103620672A (zh) | 2014-03-05 |
CA2827000C (en) | 2016-04-05 |
JP2014506687A (ja) | 2014-03-17 |
MY167853A (en) | 2018-09-26 |
ES2539174T3 (es) | 2015-06-26 |
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