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TWI456567B - 用於在譜域編碼系統中不需側邊資訊地提供雜訊時間性波封任意整形功能之技術 - Google Patents

用於在譜域編碼系統中不需側邊資訊地提供雜訊時間性波封任意整形功能之技術 Download PDF

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Publication number
TWI456567B
TWI456567B TW096129984A TW96129984A TWI456567B TW I456567 B TWI456567 B TW I456567B TW 096129984 A TW096129984 A TW 096129984A TW 96129984 A TW96129984 A TW 96129984A TW I456567 B TWI456567 B TW I456567B
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frequency domain
signal
time domain
discrete time
magnitude
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TW096129984A
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TW200818123A (en
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Mark Stuart Vinton
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Dolby Lab Licensing Corp
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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
    • G10L19/008—Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
    • 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
    • G10L19/03—Spectral prediction for preventing pre-echo; Temporary noise shaping [TNS], e.g. in MPEG2 or MPEG4
    • 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
    • G10L19/032—Quantisation or dequantisation of spectral components
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Signal Processing (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Computational Linguistics (AREA)
  • Multimedia (AREA)
  • Mathematical Physics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Burglar Alarm Systems (AREA)

Claims (21)

  1. 一種用於編碼一離散時域信號的數位音訊編碼方法，該方法使用該離散時域信號之一頻域表示的量化，該方法包含以下步驟：於頻域中獲得頻域量化誤差的量值；於頻域中濾波量化誤差的該量值以產生量化誤差的一經濾波量值；及於頻域中施加量化誤差的該經濾波量值作為一回饋信號到頻域量化前的該離散時域信號之該頻域表示，藉此當該離散時域信號之經量化的該頻域表示從頻域逆轉換回時域時，該濾波步驟之濾波參數影響量化雜訊的時間性整形。
  2. 如申請專利範圍第1項所述之方法，其中該濾波步驟係為一或更多頻率容量或頻率容量組的每一個來濾波頻域量化誤差的該量值以產生量化誤差之一經濾波量值，藉此量化誤差的該經濾波量值在該離散時域信號之該頻域表示的整個頻譜的各段中可以改變。
  3. 如申請專利範圍第1項所述之方法，其中該濾波參數是動態可控的。
  4. 如申請專利範圍第2項所述之方法，其中該濾波參數是動態可控的。
  5. 如申請專利範圍第3項所述之方法，其中該濾波參數係響應於該離散時域信號的量值而動態可控。
  6. 如申請專利範圍第4項所述之方法，其中該濾波參數係 響應於該離散時域信號的量值而動態可控。
  7. 如申請專利範圍第5項所述之方法，其中該離散時域信號的量值係透過一流程而獲得，該流程包括計算時間性信號的波封，把它取倒數並計算結果的逆DFT。
  8. 如申請專利範圍第6項所述之方法，其中該離散時域信號的量值係透過一流程而獲得，該流程包括計算時間性信號的波封，把它取倒數並計算結果的逆DFT。
  9. 如申請專利範圍第3項所述之方法，其中該濾波參數是響應於該離散時域信號之一頻域表示的量值而動態可控的。
  10. 如申請專利範圍第4項所述之方法，其中該濾波參數是響應於該離散時域信號之一頻域表示的量值而動態可控的。
  11. 如申請專利範圍第9項所述之方法，其中該離散時域信號之頻域表示的量值透過一流程獲得，該流程包括一線性預測編碼(LPC)計算。
  12. 如申請專利範圍第10項所述之方法，其中該離散時域信號之頻域表示的量值透過一流程獲得，該流程包括一線性預測編碼(LPC)計算。
  13. 如申請專利範圍第1至12項任一項所述之方法，其中該濾波參數也響應於一時間遮蔽性模型。
  14. 如申請專利範圍第13項所述之方法，其中該時間遮蔽性模型尋求提供一選出的量化雜訊時間性整形，且/或其中該時間遮蔽性模型尋求在一轉換區塊內移動該時間性量化雜訊，從該離散時域信號的相對安靜區段到相對大聲區段。
  15. 如申請專利範圍第1至12項及14項中任一項所述之數位音訊編碼方法，還包含：編碼該離散時域信號之經量化的頻域表示，以產生一編碼位元流。
  16. 如申請專利範圍第13項中所述之數位音訊編碼方法，還包含：編碼該離散時域信號之經量化的頻域表示，以產生一編碼位元流。
  17. 一種儲存於一電腦可讀媒體的電腦程式，當該電腦程式由該電腦執行時以使該電腦執行如申請專利範圍第1到第16項任一項所述之方法之所有步驟。
  18. 一種在一數位音訊編碼器中使用的頻域雜訊-回饋量化器，包括：把源自於一時域音訊信號的一頻域信號與一頻域雜訊回饋信號結合起來以產生一頻域量化器輸入信號的一第一結合器；量化該頻域量化器輸入信號以產生一頻域量化器輸出信號的一量化器；結合該頻域量化器輸入信號與該頻域量化器輸出信號以產生一量化誤差信號的一第二結合器；及濾波該頻域量化誤差信號以產生該頻域雜訊回饋信號的一雜訊回饋濾波器。
  19. 如申請專利範圍第18項所述之量化器，還包括：一動態控制該雜訊回饋濾波器參數的頻域濾波器參數控制器。
  20. 如申請專利範圍第19項所述之量化器，其中該濾波器參數控制器響應於一時域音訊信號之一個或更多的量值來控制該雜訊回饋濾波器參數，而該時域信號為頻域信號的來源。
  21. 一種如申請專利範圍第18至20項中任一項所述之量化器，其中該雜訊回饋濾波器的階數在10到20的範圍內。
TW096129984A 2006-08-15 2007-08-14 用於在譜域編碼系統中不需側邊資訊地提供雜訊時間性波封任意整形功能之技術 TWI456567B (zh)

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JP5096468B2 (ja) 2012-12-12
WO2008021247A9 (en) 2008-07-10
WO2008021247A2 (en) 2008-02-21
JP2010500631A (ja) 2010-01-07
TW200818123A (en) 2008-04-16
US20100094637A1 (en) 2010-04-15
DE602007012116D1 (de) 2011-03-03
EP2054882B1 (en) 2011-01-19
WO2008021247A3 (en) 2008-04-17
CN101501761A (zh) 2009-08-05
ATE496365T1 (de) 2011-02-15
US8706507B2 (en) 2014-04-22
EP2054882A2 (en) 2009-05-06
CN101501761B (zh) 2012-02-08

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