JP4820954B2 - デジタル音声符号器における高調波ノイズ重み付け - Google Patents
デジタル音声符号器における高調波ノイズ重み付け Download PDFInfo
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- 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
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0316—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude
- G10L21/0364—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude for improving intelligibility
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- 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
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L21/0264—Noise filtering characterised by the type of parameter measurement, e.g. correlation techniques, zero crossing techniques or predictive techniques
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Description
本発明は高調波ノイズ重み付けをデジタル音声符号器において行なう方法を含む。本方法は、音声入力s(n)を受信するステップと、ピッチ周期(D)を音声入力から求めるステップと、高調波ノイズ重み付け係数εpをピッチ周期に基づいて決定するステップと、を含む。次に、知覚ノイズ重み付け関数WH(z)を高調波ノイズ重み付け係数に基づいて決定する。
εmaxは高調波ノイズ重み付け係数の最大許容値であり、
εminは高調波ノイズ重み付け係数の最小許容値であり、
Dmaxは最大ピッチ周期であり、この周期を超えると、高調波ノイズ重み付け係数がεminに設定され、
Δは高調波ノイズ重み付け係数の傾きである。
図5は符号器300の動作を示すフロー・チャートである。論理フローはステップ501から始まり、このステップでは、音声入力(s(n))をピッチ解析回路311が受信する。ステップ503では、ピッチ解析回路311はピッチ周期(D)を求め、DをHNW係数発生器309に出力する。HNW係数発生器309はDを使用して高調波ノイズ重み付け係数(εp)をDに基づいて決定し、そしてεpを知覚誤差重み付けフィルタ306に出力する(ステップ505)。最後に、ステップ507では、フィルタ306はεpを使用して知覚ノイズ重み付け関数WH(z)を生成する。
Claims (2)
- 高調波ノイズ重み付けをデジタル音声符号器において行なう方法であって、
音声入力s(n)を受信するステップと、
閉ループ・ピッチ遅延(τ)を前記音声入力から求めるステップと、
高調波ノイズ重み付け係数εpを前記閉ループ・ピッチ遅延に基づいて決定するステップであって、次式が成り立ち、
εmaxは前記高調波ノイズ重み付け係数の最大許容値であり、
εminは前記高調波ノイズ重み付け係数の最小許容値であり、
前記高調波ノイズ重み付け係数は、前記最大許容値と前記最小許容値との間で、前記閉ループ・ピッチ遅延と比例し、
τmaxは最大閉ループ・ピッチ遅延であり、該ピッチ遅延を超えると、前記高調波ノイズ重み付け係数がεminに設定され、
Δは前記高調波ノイズ重み付け係数の傾きである、前記高調波ノイズ重み付け係数εpを決定するステップと、
知覚ノイズ重み付け関数WH(z)を前記高調波ノイズ重み付け係数に基づいて決定するステップと、
を備える方法。 - 装置であって、
閉ループ・ピッチ遅延(τ)を入力として有し、かつ高調波ノイズ重み付け係数(εp)をτに基づいて出力する高調波ノイズ係数発生器であって、次式が成り立ち、
εmaxは前記高調波ノイズ重み付け係数の最大許容値であり、
εminは前記高調波ノイズ重み付け係数の最小許容値であり、
前記高調波ノイズ重み付け係数は、前記最大許容値と前記最小許容値との間で、前記閉ループ・ピッチ遅延と比例し、
τmaxは最大閉ループ・ピッチ遅延であり、該ピッチ遅延を超えると、前記高調波ノイズ重み付け係数がεminに設定され、
Δは前記高調波ノイズ重み付け係数の傾きである、前記高調波ノイズ係数発生器と、
εpを入力として有し、かつe(n)がs(n)とs(n)の推定値との間の差に基づいて表わされる場合に、εpを使用して重み付け誤差信号e(n)を生成する知覚誤差重み付けフィルタと、
を備える装置。
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US51558103P | 2003-10-30 | 2003-10-30 | |
US60/515,581 | 2003-10-30 | ||
US10/965,462 | 2004-10-14 | ||
US10/965,462 US6983241B2 (en) | 2003-10-30 | 2004-10-14 | Method and apparatus for performing harmonic noise weighting in digital speech coders |
PCT/US2004/035757 WO2005045808A1 (en) | 2003-10-30 | 2004-10-26 | Harmonic noise weighting in digital speech coders |
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JP2007513364A JP2007513364A (ja) | 2007-05-24 |
JP4820954B2 true JP4820954B2 (ja) | 2011-11-24 |
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US (1) | US6983241B2 (ja) |
JP (1) | JP4820954B2 (ja) |
KR (1) | KR100718487B1 (ja) |
CN (1) | CN1875401B (ja) |
CA (1) | CA2542137C (ja) |
WO (1) | WO2005045808A1 (ja) |
Families Citing this family (4)
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KR100744375B1 (ko) | 2005-07-11 | 2007-07-30 | 삼성전자주식회사 | 음성 처리 장치 및 방법 |
US8073148B2 (en) | 2005-07-11 | 2011-12-06 | Samsung Electronics Co., Ltd. | Sound processing apparatus and method |
MX2012011943A (es) * | 2010-04-14 | 2013-01-24 | Voiceage Corp | Libro de códigos de innovacion combinado, flexible y escalable para uso en codificador y decodificador celp. |
KR102605961B1 (ko) * | 2019-01-13 | 2023-11-23 | 후아웨이 테크놀러지 컴퍼니 리미티드 | 고해상도 오디오 코딩 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH04233600A (ja) * | 1990-06-29 | 1992-08-21 | American Teleph & Telegr Co <Att> | 32Kb/sワイドバンド音声の低遅延コード励起線型予測符号化 |
US5528723A (en) * | 1990-12-28 | 1996-06-18 | Motorola, Inc. | Digital speech coder and method utilizing harmonic noise weighting |
JPH10214100A (ja) * | 1997-01-31 | 1998-08-11 | Sony Corp | 音声合成方法 |
JP2003512654A (ja) * | 1999-10-19 | 2003-04-02 | アトメル・コーポレイション | 音声の可変レートコーディングのための方法およびその装置 |
JP2003216198A (ja) * | 1994-02-16 | 2003-07-30 | Qualcomm Inc | ボコーダasic |
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TW376611B (en) * | 1998-05-26 | 1999-12-11 | Koninkl Philips Electronics Nv | Transmission system with improved speech encoder |
JP3612260B2 (ja) * | 2000-02-29 | 2005-01-19 | 株式会社東芝 | 音声符号化方法及び装置並びに及び音声復号方法及び装置 |
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- 2004-10-26 KR KR1020067008366A patent/KR100718487B1/ko active IP Right Grant
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04233600A (ja) * | 1990-06-29 | 1992-08-21 | American Teleph & Telegr Co <Att> | 32Kb/sワイドバンド音声の低遅延コード励起線型予測符号化 |
US5528723A (en) * | 1990-12-28 | 1996-06-18 | Motorola, Inc. | Digital speech coder and method utilizing harmonic noise weighting |
JP2003216198A (ja) * | 1994-02-16 | 2003-07-30 | Qualcomm Inc | ボコーダasic |
JPH10214100A (ja) * | 1997-01-31 | 1998-08-11 | Sony Corp | 音声合成方法 |
JP2003512654A (ja) * | 1999-10-19 | 2003-04-02 | アトメル・コーポレイション | 音声の可変レートコーディングのための方法およびその装置 |
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KR20060064694A (ko) | 2006-06-13 |
JP2007513364A (ja) | 2007-05-24 |
CN1875401A (zh) | 2006-12-06 |
US20050096903A1 (en) | 2005-05-05 |
CA2542137A1 (en) | 2005-05-19 |
CN1875401B (zh) | 2011-01-12 |
WO2005045808A1 (en) | 2005-05-19 |
KR100718487B1 (ko) | 2007-05-16 |
CA2542137C (en) | 2012-06-26 |
US6983241B2 (en) | 2006-01-03 |
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