JP2005091749A - 音源信号符号化装置、及び音源信号符号化方法 - Google Patents
音源信号符号化装置、及び音源信号符号化方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000013598 vector Substances 0.000 claims abstract description 198
- 230000005540 biological transmission Effects 0.000 claims abstract description 31
- 230000005284 excitation Effects 0.000 claims description 134
- 239000011159 matrix material Substances 0.000 claims description 21
- 238000012544 monitoring process Methods 0.000 claims description 14
- 230000003044 adaptive effect Effects 0.000 abstract description 68
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- 238000013139 quantization Methods 0.000 description 12
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
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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
- 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
- G10L19/04—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 predictive techniques
- G10L19/16—Vocoder architecture
- G10L19/18—Vocoders using multiple modes
- G10L19/22—Mode decision, i.e. based on audio signal content versus external parameters
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0014—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the source coding
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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
- 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
- G10L2019/0001—Codebooks
- G10L2019/0013—Codebook search algorithms
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Abstract
【解決手段】 適応符号帳探索では、従来の探索方法と本発明の探索方法のいずれか一方を、伝送路状況監視部215から入力された情報に基づいて切り替えられる。即ち、伝送路の状況が良く、受信側でパケット破棄等が観測されていない場合は、通常の探索方法を用い、そうでない場合(パケット破棄が受信側で例えば5%以上の破棄率で観測されているような場合)は本発明の探索方法を用いる。
【選択図】 図3
Description
103 音声符号化装置
110 移動局装置
201 線形予測分析部
202 重みづけ部
203 目標ベクトル生成部
204 LPC量子化部
205 インパルス応答算出部
206 適応符号帳探索部
207 固定符号帳探索部
208 利得符号帳探索部
209 適応符号帳成分合成部
210 固定符号帳成分合成部
211 加算器
212 局部復号部
213 多重化部
214 パケット化部
215 伝送路状況監視部
Claims (8)
- 第1の音源符号帳から出力される第1の音源ベクトルと第2の音源符号帳から出力される第2の音源ベクトルとの和で音源信号を符号化する音源信号符号化装置であって、
目標ベクトルと前記第1の音源ベクトルによって生成される合成信号との誤差ベクトルと、前記目標ベクトルと相似性を有する第2の目標ベクトルとの誤差を最小化する第1の音源探索方法を用いて前記第1の音源符号帳の探索を行う音源符号帳探索手段を具備することを特徴とする音源信号符号化装置。 - 前記第2の目標ベクトルは、対角要素のみに値を有し、その値の範囲が0以上1以下である重みづけ行列を前記第1の目標ベクトルに掛けて得られるベクトルであることを特徴とする請求項1記載の音源信号符号化装置。
- 前記重みづけ行列の対角要素が全て等しい値であることを特徴とする請求項2記載の音源信号符号化装置。
- 伝送路の混雑状況や誤り状況を監視する監視手段と、
前記監視状況に応じて前記重みづけ行列の対角要素の値を切り替える切替手段と、
を更に具備することを特徴とする請求項2または3記載の音源信号符号化装置。 - 請求項1から4のいずれかに記載の音源信号符号化装置を具備したことを特徴とする移動局装置。
- 請求項1から4のいずれかに記載の音源信号符号化装置を具備したことを特徴とする基地局装置。
- 第1の音源符号帳から出力される第1の音源ベクトルと第2の音源符号帳から出力される第2の音源ベクトルとの和で音源信号を符号化する音源信号符号化方法であって、
前記第1の目標ベクトルと、前記第1の音源符号帳から出力される第1の音源ベクトルを用いて生成される第1の合成ベクトルとの誤差ベクトルと、前記第1の目標ベクトルと相似な第2の目標ベクトルとの誤差を最小化する第1の音源符号帳探索工程と、
前記第1の目標ベクトルと前記第1の音源ベクトルを用いて生成される合成ベクトルとの誤差ベクトルと、前記第2の音源符号帳から生成される前記第2の音源ベクトルを用いて生成される合成ベクトルとの誤差を最小化する第2の音源符号帳探索工程と、
を具備することを特徴とする音源信号符号化方法。 - 第1の音源符号帳から出力される第1の音源ベクトルと第2の音源符号帳から出力される第2の音源ベクトルとの和で音源信号を符号化するための音源信号符号化プログラムであって、
前記第1の目標ベクトルと、前記第1の音源符号帳から出力される第1の音源ベクトルを用いて生成される第1の合成ベクトルとの誤差ベクトルと、前記第1の目標ベクトルと相似な第2の目標ベクトルとの誤差を最小化する第1の音源符号帳探索ステップと、
前記第1の目標ベクトルと前記第1の音源ベクトルを用いて生成される合成ベクトルとの誤差ベクトルと、前記第2の音源符号帳から生成される前記第2の音源ベクトルを用いて生成される合成ベクトルとの誤差を最小化する第2の音源符号帳探索ステップと、
を具備することを特徴とする音源信号符号化プログラム。
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JP2003325002A JP4414705B2 (ja) | 2003-09-17 | 2003-09-17 | 音源信号符号化装置、及び音源信号符号化方法 |
US10/923,694 US7373298B2 (en) | 2003-09-17 | 2004-08-24 | Apparatus and method for coding excitation signal |
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Cited By (2)
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WO2008072736A1 (ja) * | 2006-12-15 | 2008-06-19 | Panasonic Corporation | 適応音源ベクトル量子化装置および適応音源ベクトル量子化方法 |
WO2008072735A1 (ja) * | 2006-12-15 | 2008-06-19 | Panasonic Corporation | 適応音源ベクトル量子化装置、適応音源ベクトル逆量子化装置、およびこれらの方法 |
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US20060050695A1 (en) * | 2004-09-07 | 2006-03-09 | Nokia Corporation | System and method for using redundant representations in streaming applications |
US7917583B2 (en) * | 2006-02-17 | 2011-03-29 | Verizon Patent And Licensing Inc. | Television integrated chat and presence systems and methods |
PT2102619T (pt) * | 2006-10-24 | 2017-05-25 | Voiceage Corp | Método e dispositivo para codificação de tramas de transição em sinais de voz |
WO2009023807A1 (en) * | 2007-08-15 | 2009-02-19 | Massachusetts Institute Of Technology | Speech processing apparatus and method employing feedback |
US9058818B2 (en) * | 2009-10-22 | 2015-06-16 | Broadcom Corporation | User attribute derivation and update for network/peer assisted speech coding |
US8924186B1 (en) * | 2010-09-09 | 2014-12-30 | Sas Ip, Inc. | Simulations of physical systems for multiple excitations |
US9768793B2 (en) * | 2015-12-17 | 2017-09-19 | Analog Devices Global | Adaptive digital quantization noise cancellation filters for mash ADCs |
WO2020147135A1 (zh) * | 2019-01-20 | 2020-07-23 | Oppo广东移动通信有限公司 | 一种码本处理方法及装置、终端、网络设备 |
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JPH0573097A (ja) | 1991-09-17 | 1993-03-26 | Nippon Telegr & Teleph Corp <Ntt> | 低遅延符号駆動形予測符号化方法 |
JP2700974B2 (ja) | 1992-04-09 | 1998-01-21 | 日本電信電話株式会社 | 音声符号化法 |
FI107420B (fi) * | 1994-04-18 | 2001-07-31 | Nokia Networks Oy | Vastaanottomenetelmä ja vastaanotin |
US6141638A (en) * | 1998-05-28 | 2000-10-31 | Motorola, Inc. | Method and apparatus for coding an information signal |
US6104992A (en) * | 1998-08-24 | 2000-08-15 | Conexant Systems, Inc. | Adaptive gain reduction to produce fixed codebook target signal |
JP3420222B2 (ja) | 2001-07-16 | 2003-06-23 | 株式会社東芝 | 利得形状ベクトル量子化方法とこれを用いた音声符号化方法及び装置 |
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Cited By (6)
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WO2008072736A1 (ja) * | 2006-12-15 | 2008-06-19 | Panasonic Corporation | 適応音源ベクトル量子化装置および適応音源ベクトル量子化方法 |
WO2008072735A1 (ja) * | 2006-12-15 | 2008-06-19 | Panasonic Corporation | 適応音源ベクトル量子化装置、適応音源ベクトル逆量子化装置、およびこれらの方法 |
US8200483B2 (en) | 2006-12-15 | 2012-06-12 | Panasonic Corporation | Adaptive sound source vector quantization device, adaptive sound source vector inverse quantization device, and method thereof |
US8249860B2 (en) | 2006-12-15 | 2012-08-21 | Panasonic Corporation | Adaptive sound source vector quantization unit and adaptive sound source vector quantization method |
JP5230444B2 (ja) * | 2006-12-15 | 2013-07-10 | パナソニック株式会社 | 適応音源ベクトル量子化装置および適応音源ベクトル量子化方法 |
JP5241509B2 (ja) * | 2006-12-15 | 2013-07-17 | パナソニック株式会社 | 適応音源ベクトル量子化装置、適応音源ベクトル逆量子化装置、およびこれらの方法 |
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