BRPI0507838A - métodos e dispositivos para uma ênfase de baixa freqüência durante uma compressão de áudio com base em acelp/tcx - Google Patents

métodos e dispositivos para uma ênfase de baixa freqüência durante uma compressão de áudio com base em acelp/tcx

Info

Publication number
BRPI0507838A
BRPI0507838A BRPI0507838-5A BRPI0507838A BRPI0507838A BR PI0507838 A BRPI0507838 A BR PI0507838A BR PI0507838 A BRPI0507838 A BR PI0507838A BR PI0507838 A BRPI0507838 A BR PI0507838A
Authority
BR
Brazil
Prior art keywords
low frequency
block
devices
frequency emphasis
audio compression
Prior art date
Application number
BRPI0507838-5A
Other languages
English (en)
Inventor
Bruno Bessette
Original Assignee
Voiceage Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voiceage Corp filed Critical Voiceage Corp
Publication of BRPI0507838A publication Critical patent/BRPI0507838A/pt

Links

Classifications

    • 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
    • G10L19/0204—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 using subband decomposition
    • G10L19/0208—Subband vocoders
    • 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
    • G10L19/24—Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding
    • 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
    • G10L19/26—Pre-filtering or post-filtering
    • G10L19/265—Pre-filtering, e.g. high frequency emphasis prior to encoding
    • 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
    • G10L19/005—Correction of errors induced by the transmission channel, if related to the coding algorithm
    • 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
    • G10L21/0216—Noise filtering characterised by the method used for estimating noise
    • G10L21/0232—Processing in the frequency domain

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computational Linguistics (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Quality & Reliability (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

MéTODO E DISPOSITIVOS PARA UM êNFASE DE BAIXA FREQüêNCIA DURANTE UMA COMPRESSãO DE áUDIO COM BASE EM ACELP/TCX. Um aspecto da presente inveção se refere a um método para a ênfase com baixa freqüência do espectro de um sinal de som transformado em um domínio de freqüência e compreendendo coeficientes de transformada em vários blocos, nos quais uma energia máxima para um bloco é calculada e um índice de posição do bloco com energia máxima é determinado, um fator é calculado para cada bloco tendo um índice de posição menor do que o índice de posição do bloco com energia máxima, e para cada bloco um ganho é determinado a partir do fator e é aplicado aos coeficientes de transformada do bloco.
BRPI0507838-5A 2004-02-18 2005-02-18 métodos e dispositivos para uma ênfase de baixa freqüência durante uma compressão de áudio com base em acelp/tcx BRPI0507838A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA002457988A CA2457988A1 (en) 2004-02-18 2004-02-18 Methods and devices for audio compression based on acelp/tcx coding and multi-rate lattice vector quantization
PCT/CA2005/000220 WO2005078706A1 (en) 2004-02-18 2005-02-18 Methods and devices for low-frequency emphasis during audio compression based on acelp/tcx

Publications (1)

Publication Number Publication Date
BRPI0507838A true BRPI0507838A (pt) 2007-07-10

Family

ID=34842422

Family Applications (1)

Application Number Title Priority Date Filing Date
BRPI0507838-5A BRPI0507838A (pt) 2004-02-18 2005-02-18 métodos e dispositivos para uma ênfase de baixa freqüência durante uma compressão de áudio com base em acelp/tcx

Country Status (12)

Country Link
US (2) US7979271B2 (pt)
EP (1) EP1719116B1 (pt)
JP (1) JP4861196B2 (pt)
CN (1) CN1957398B (pt)
AU (1) AU2005213726A1 (pt)
BR (1) BRPI0507838A (pt)
CA (2) CA2457988A1 (pt)
DK (1) DK1719116T3 (pt)
ES (1) ES2433043T3 (pt)
PT (1) PT1719116E (pt)
RU (1) RU2389085C2 (pt)
WO (1) WO2005078706A1 (pt)

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