MXPA03010237A - Mejoramiento del funcionamiento de transitorios en sistemas de codificacion de audio de baja tasa de transferencia de bitios mediante la reduccion del pre-ruido. - Google Patents

Mejoramiento del funcionamiento de transitorios en sistemas de codificacion de audio de baja tasa de transferencia de bitios mediante la reduccion del pre-ruido.

Info

Publication number
MXPA03010237A
MXPA03010237A MXPA03010237A MXPA03010237A MXPA03010237A MX PA03010237 A MXPA03010237 A MX PA03010237A MX PA03010237 A MXPA03010237 A MX PA03010237A MX PA03010237 A MXPA03010237 A MX PA03010237A MX PA03010237 A MXPA03010237 A MX PA03010237A
Authority
MX
Mexico
Prior art keywords
transient
noise
rate audio
audio coding
audio signal
Prior art date
Application number
MXPA03010237A
Other languages
English (en)
Inventor
Brett G. Crockett
Original Assignee
Dolby Lab Licensing 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 Dolby Lab Licensing Corp filed Critical Dolby Lab Licensing Corp
Publication of MXPA03010237A publication Critical patent/MXPA03010237A/es

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/04—Time compression or expansion
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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
    • G10L19/0212—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 orthogonal transformation
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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
    • G10L19/022—Blocking, i.e. grouping of samples in time; Choice of analysis windows; Overlap factoring
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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
    • G10L19/022—Blocking, i.e. grouping of samples in time; Choice of analysis windows; Overlap factoring
    • G10L19/025—Detection of transients or attacks for time/frequency resolution switching

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Computational Linguistics (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Human Computer Interaction (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Quality & Reliability (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Noise Elimination (AREA)
  • Analogue/Digital Conversion (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

Los artefactos de distorsion que preceden a un transitorio de senal en un flujo de senales de audio procesado mediante un sistema de codificacion de audio de baja tasa de transferencia de bitios, en base a transformaciones, que emplea bloques de codificacion, se reducen detectando un transitorio en el flujo de senales de audio y desplazando la relacion temporal del transitorio con respecto a los bloques de codificacion, de manera tal que se reduzca la duracion en el tiempo de los artefactos de distorsion. Los datos de audio se escalan en el tiempo, en una manera tal que los transitorios son reubicados temporalmente antes de la cuantificacion en un codificador de audio de baja tasa de transferencia de bitios, basado en transformaciones, a fin de reducir la cantidad de pre-ruido en la senal de audio codificada. En forma alternativa, o adicional, en un sistema de codificacion de audio de baja tasa de transferencia de bitios, basado en transformaciones, se detecta un transitorio en el flujo de senales de audio, y una porcion de los artefactos de distorsion se comprimen en el tiempo de manera tal que se reduce la duracion en el tiempo de los artefactos de distorsion. La figura mas representativa de la invencion es la numero 6 .
MXPA03010237A 2001-05-10 2002-04-25 Mejoramiento del funcionamiento de transitorios en sistemas de codificacion de audio de baja tasa de transferencia de bitios mediante la reduccion del pre-ruido. MXPA03010237A (es)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US29028601P 2001-05-10 2001-05-10
PCT/US2002/012957 WO2002093560A1 (en) 2001-05-10 2002-04-25 Improving transient performance of low bit rate audio coding systems by reducing pre-noise

Publications (1)

Publication Number Publication Date
MXPA03010237A true MXPA03010237A (es) 2004-03-16

Family

ID=23115313

Family Applications (1)

Application Number Title Priority Date Filing Date
MXPA03010237A MXPA03010237A (es) 2001-05-10 2002-04-25 Mejoramiento del funcionamiento de transitorios en sistemas de codificacion de audio de baja tasa de transferencia de bitios mediante la reduccion del pre-ruido.

Country Status (14)

Country Link
US (1) US7313519B2 (es)
EP (1) EP1386312B1 (es)
JP (1) JP4290997B2 (es)
KR (1) KR100945673B1 (es)
CN (1) CN1312662C (es)
AT (1) ATE387000T1 (es)
AU (1) AU2002307533B2 (es)
CA (1) CA2445480C (es)
DE (1) DE60225130T2 (es)
DK (1) DK1386312T3 (es)
ES (1) ES2298394T3 (es)
HK (1) HK1070457A1 (es)
MX (1) MXPA03010237A (es)
WO (1) WO2002093560A1 (es)

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EP1386312A1 (en) 2004-02-04
JP2004528597A (ja) 2004-09-16
ES2298394T3 (es) 2008-05-16
US7313519B2 (en) 2007-12-25
EP1386312B1 (en) 2008-02-20
CN1312662C (zh) 2007-04-25
CA2445480C (en) 2011-04-12
KR100945673B1 (ko) 2010-03-05
WO2002093560A1 (en) 2002-11-21
CA2445480A1 (en) 2002-11-21
DK1386312T3 (da) 2008-06-09
CN1552060A (zh) 2004-12-01
AU2002307533B2 (en) 2008-01-31
DE60225130T2 (de) 2009-02-26
JP4290997B2 (ja) 2009-07-08
HK1070457A1 (en) 2005-06-17
KR20040034604A (ko) 2004-04-28
US20040133423A1 (en) 2004-07-08
DE60225130D1 (de) 2008-04-03
ATE387000T1 (de) 2008-03-15

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