MX9504290A - Metodo de compensacion de borrado de cuadro o paquetes perdidos. - Google Patents

Metodo de compensacion de borrado de cuadro o paquetes perdidos.

Info

Publication number
MX9504290A
MX9504290A MX9504290A MX9504290A MX9504290A MX 9504290 A MX9504290 A MX 9504290A MX 9504290 A MX9504290 A MX 9504290A MX 9504290 A MX9504290 A MX 9504290A MX 9504290 A MX9504290 A MX 9504290A
Authority
MX
Mexico
Prior art keywords
signal
decoding
excitation
corrupted
preprocessor
Prior art date
Application number
MX9504290A
Other languages
English (en)
Inventor
Juin-Hwey Chen
Craig Robert Watkins
Original Assignee
At & T 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 At & T Corp filed Critical At & T Corp
Publication of MX9504290A publication Critical patent/MX9504290A/es

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
    • G10L19/005—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
    • 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
    • G10L19/08—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
    • G10L19/12—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters the excitation function being a code excitation, e.g. in code excited linear prediction [CELP] vocoders

Landscapes

  • Engineering & Computer Science (AREA)
  • Computational Linguistics (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La presente invencion se refiere a un método y aparato para mejorar el desempeño de sistemas de codificacion en la presencia de borrados de cuadro o paquetes perdidos. La señal codificada se modifica después de la transmision pero antes de ser decodificada por un procesador decodificador. El preprocesador reconoce que un cuadro determinado es corrompido y modifica la señal codificada, de manera tal que su decodificacion resultará en un desempeño mejorado del sistema de codificacion. Específicamente, con base en el proceso de codificacion y en una señal objetivo predeterminada, la señal codificada se modifica de manera tal que su decodificacion generará una aproximacion a la señal objetivo. En una primera modalidad ilustrativa, se emplea un codificador de habla CELP y la señal objetivo es una señal de excitacion que comprende vectores de excitacion todos cero. En este caso, la porcion de los índices de señal de excitacion corrupta que identifican los factores de ganancia correspondientes se ajustan a valores que representan un factor de baja ganancia. En una segunda modalidad ilustrativa, un codificador da habla CELP se emplea y la señal objetivo comprende una extrapolacion de la señal de excitacion representada por la señal codificada para uno o más cuadros previos. En este caso, el procesador codifica la señal de excitacion extrapolada utilizando los mejores ajustes del libro de codigos disponible. En cualquier caso, el efecto de cuadros corruptos en la señal de habla reconstruida se minimiza.
MX9504290A 1994-10-14 1995-10-10 Metodo de compensacion de borrado de cuadro o paquetes perdidos. MX9504290A (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/324,283 US5550543A (en) 1994-10-14 1994-10-14 Frame erasure or packet loss compensation method

Publications (1)

Publication Number Publication Date
MX9504290A true MX9504290A (es) 1997-01-31

Family

ID=23262912

Family Applications (1)

Application Number Title Priority Date Filing Date
MX9504290A MX9504290A (es) 1994-10-14 1995-10-10 Metodo de compensacion de borrado de cuadro o paquetes perdidos.

Country Status (9)

Country Link
US (1) US5550543A (es)
EP (1) EP0707308B1 (es)
JP (1) JP3241978B2 (es)
KR (1) KR960016291A (es)
AU (1) AU3313395A (es)
CA (1) CA2156000C (es)
DE (1) DE69521004T2 (es)
ES (1) ES2157302T3 (es)
MX (1) MX9504290A (es)

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Also Published As

Publication number Publication date
DE69521004T2 (de) 2001-11-29
CA2156000A1 (en) 1996-04-15
CA2156000C (en) 1999-11-02
EP0707308B1 (en) 2001-05-23
AU3313395A (en) 1996-04-26
JPH08227300A (ja) 1996-09-03
DE69521004D1 (de) 2001-06-28
US5550543A (en) 1996-08-27
JP3241978B2 (ja) 2001-12-25
KR960016291A (ko) 1996-05-22
EP0707308A1 (en) 1996-04-17
ES2157302T3 (es) 2001-08-16

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