JP2001500640A - オーディオ信号の符号化方法 - Google Patents
オーディオ信号の符号化方法Info
- Publication number
- JP2001500640A JP2001500640A JP11506194A JP50619499A JP2001500640A JP 2001500640 A JP2001500640 A JP 2001500640A JP 11506194 A JP11506194 A JP 11506194A JP 50619499 A JP50619499 A JP 50619499A JP 2001500640 A JP2001500640 A JP 2001500640A
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- noise
- spectral
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- signal
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- 230000005236 sound signal Effects 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 45
- 230000003595 spectral effect Effects 0.000 claims abstract description 133
- 230000002123 temporal effect Effects 0.000 claims abstract description 20
- 238000006467 substitution reaction Methods 0.000 claims abstract description 8
- 238000001228 spectrum Methods 0.000 claims description 38
- 238000001514 detection method Methods 0.000 claims description 10
- 230000001052 transient effect Effects 0.000 abstract description 15
- 238000012545 processing Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000013139 quantization Methods 0.000 description 22
- 230000015572 biosynthetic process Effects 0.000 description 17
- 238000003786 synthesis reaction Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 10
- 238000007493 shaping process Methods 0.000 description 9
- 238000004458 analytical method Methods 0.000 description 7
- 230000000873 masking effect Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 230000004044 response Effects 0.000 description 6
- 238000005311 autocorrelation function Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- 230000003068 static effect Effects 0.000 description 5
- 230000003321 amplification Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
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- 230000006872 improvement Effects 0.000 description 2
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- 241000224511 Bodo Species 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
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- 230000001419 dependent effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/66—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/66—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission
- H04B1/665—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission using psychoacoustic properties of the ear, e.g. masking effect
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
- G10L19/028—Noise substitution, i.e. substituting non-tonal spectral components by noisy source
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Health & Medical Sciences (AREA)
- Computational Linguistics (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
Abstract
Description
Claims (1)
- 【特許請求の範囲】 1.オーディオ信号を周波数領域に変換して(202)時間的オーディオ信号の スペクトル値(x(1)、・・・、x(n))を得て、 周波数(804)と関連してスペクトル値の予測を実施し、スペクトル残留値(xR (1)、・・・、xR(N))を得て、 スペクトル残留値中のノイズ領域を検出し(310)、 ノイズ領域中のスペクトル残留値をノイズ置換し(310)、かつ 符号化されたオーディオ信号の副情報中にノイズ領域とノイズ置換とに関する情 報を導入する(208) ことを含んでなるオーディオ信号の符号化方法。 2.オーディオ信号を受けて(212)、 副情報中のノイズ置換とスペクトル残留値のノイズ領域に関する情報を検出し( 214)、 ノイズ領域中に検出された情報に基づいてスペクトルノイズ残留値を発生し(3 12)、 周波数に関連して逆予測(900)を実施して、ノイズ置換スペクトルノイズ残 留値からスペクトル値を得て、 該スペクトルを時間領域に変換して(218)、解号化オーディオ信号を得ること を含んでなるオーディオ信号の符号化方法。 3.予測(804)または逆予測(900)がスペクトル値(x(1)、・・・、 x(n))の特定の範囲についてのみ実施される ことを特徴とする請求項1または2に記載の方法。 4.符号化されたオーディオ信号の副情報が、予測が使用されたというヒントと 予測係数と選択的に予測(804)の周波数範囲情報と、を含んでいる ことを特徴とする請求項1〜3のいずれかひとつに記載の方法。 5.予測(804)により発生されたフィルター係数が符号化されたオーディオ 信号(208)の副情報に導入される ことを特徴とする請求項1〜4のいずれかひとつに記載の方法。 6.ノイズ置換(310)がスケールファクター帯域の形で実施される ことを特徴とする請求項1〜5のいずれかひとつに記載の方法。 7.ノイズ置換(310)に際してスケールファクターを有した検出ノイズ領域 中のスペクトル残留値(xR(1)、・・・、xR(n))エネルギーを算出し、副情 報中に含まれてノイズ置換に関する情報はスケールファクターのためのビットフ ロー中の位置に含まれており、対応するノイズ領域中にエラー残留値のエネルギ ーを含んでいる ことを特徴とする請求項1〜6のいずれかひとつに記載の方法。 8.符号化中はノイズ領域中に存在しないスペクトル残留値が心理音響学を考慮 して量子化され、解号化中はノイズ領域中に存在しないスペクトル残留値が再量 子化され、ついで逆予測に掛けられて、スペクトル値(x1)、・・・、x(n)) を得る ことを特徴とする請求項1〜7のいずれかひとつに記載の方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19730130.4 | 1997-07-14 | ||
DE19730130A DE19730130C2 (de) | 1997-07-14 | 1997-07-14 | Verfahren zum Codieren eines Audiosignals |
PCT/EP1998/001481 WO1999004506A1 (de) | 1997-07-14 | 1998-03-13 | Verfahren zum codieren eines audiosignals |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2001500640A true JP2001500640A (ja) | 2001-01-16 |
JP3577324B2 JP3577324B2 (ja) | 2004-10-13 |
Family
ID=7835664
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP50619499A Expired - Lifetime JP3577324B2 (ja) | 1997-07-14 | 1998-03-13 | オーディオ信号の符号化方法 |
Country Status (11)
Country | Link |
---|---|
US (1) | US6424939B1 (ja) |
EP (1) | EP0954909B1 (ja) |
JP (1) | JP3577324B2 (ja) |
KR (1) | KR100346066B1 (ja) |
AT (1) | ATE205030T1 (ja) |
AU (1) | AU723582B2 (ja) |
CA (1) | CA2286068C (ja) |
DE (2) | DE19730130C2 (ja) |
DK (1) | DK0954909T3 (ja) |
ES (1) | ES2161052T3 (ja) |
WO (1) | WO1999004506A1 (ja) |
Cited By (7)
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JP2002532765A (ja) * | 1998-12-14 | 2002-10-02 | マイクロソフト コーポレイション | 周波数領域オーディオ符号化のためのエントロピー符号モード切替え |
JP2007501441A (ja) * | 2003-05-08 | 2007-01-25 | ドルビー・ラボラトリーズ・ライセンシング・コーポレーション | スペクトル成分結合およびスペクトル成分再生を用いた改良オーディオコード化システム |
JP2009518694A (ja) * | 2005-12-05 | 2009-05-07 | クゥアルコム・インコーポレイテッド | トーンコンポーネントの検出のためのシステム、方法および装置 |
JP2013507648A (ja) * | 2009-10-08 | 2013-03-04 | フラウンホッファー−ゲゼルシャフト ツァ フェルダールング デァ アンゲヴァンテン フォアシュンク エー.ファオ | 線形予測符号化ベースのノイズ整形を用いた多重モードオーディオ信号デコーダ、多重モードオーディオ信号エンコーダ、方法およびコンピュータプログラム |
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JP2002532765A (ja) * | 1998-12-14 | 2002-10-02 | マイクロソフト コーポレイション | 周波数領域オーディオ符号化のためのエントロピー符号モード切替え |
JP4786796B2 (ja) * | 1998-12-14 | 2011-10-05 | マイクロソフト コーポレーション | 周波数領域オーディオ符号化のためのエントロピー符号モード切替え |
JP2007501441A (ja) * | 2003-05-08 | 2007-01-25 | ドルビー・ラボラトリーズ・ライセンシング・コーポレーション | スペクトル成分結合およびスペクトル成分再生を用いた改良オーディオコード化システム |
JP4782685B2 (ja) * | 2003-05-08 | 2011-09-28 | ドルビー・ラボラトリーズ・ライセンシング・コーポレーション | スペクトル成分結合およびスペクトル成分再生を用いた改良オーディオコード化システム |
JP2009518694A (ja) * | 2005-12-05 | 2009-05-07 | クゥアルコム・インコーポレイテッド | トーンコンポーネントの検出のためのシステム、方法および装置 |
US8219392B2 (en) | 2005-12-05 | 2012-07-10 | Qualcomm Incorporated | Systems, methods, and apparatus for detection of tonal components employing a coding operation with monotone function |
US9172965B2 (en) | 2008-05-02 | 2015-10-27 | Microsoft Technology Licensing, Llc | Multi-level representation of reordered transform coefficients |
US8406307B2 (en) | 2008-08-22 | 2013-03-26 | Microsoft Corporation | Entropy coding/decoding of hierarchically organized data |
JP2013507648A (ja) * | 2009-10-08 | 2013-03-04 | フラウンホッファー−ゲゼルシャフト ツァ フェルダールング デァ アンゲヴァンテン フォアシュンク エー.ファオ | 線形予測符号化ベースのノイズ整形を用いた多重モードオーディオ信号デコーダ、多重モードオーディオ信号エンコーダ、方法およびコンピュータプログラム |
JP2017517016A (ja) * | 2014-02-10 | 2017-06-22 | アウディマックス・エルエルシー | 耐雑音性を改良した通信システム、方法および装置 |
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KR20000076297A (ko) | 2000-12-26 |
EP0954909A1 (de) | 1999-11-10 |
AU723582B2 (en) | 2000-08-31 |
US6424939B1 (en) | 2002-07-23 |
JP3577324B2 (ja) | 2004-10-13 |
KR100346066B1 (ko) | 2002-07-24 |
ATE205030T1 (de) | 2001-09-15 |
AU7520798A (en) | 1999-02-10 |
DE19730130C2 (de) | 2002-02-28 |
ES2161052T3 (es) | 2001-11-16 |
EP0954909B1 (de) | 2001-08-29 |
CA2286068C (en) | 2004-04-27 |
DK0954909T3 (da) | 2001-10-08 |
DE59801307D1 (de) | 2001-10-04 |
CA2286068A1 (en) | 1999-01-28 |
WO1999004506A1 (de) | 1999-01-28 |
DE19730130A1 (de) | 1999-01-21 |
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