ES2096481T3 - Asignacion binaria adaptable eficaz desde el punto de vista del calculo para metodo y aparato codificador. - Google Patents

Asignacion binaria adaptable eficaz desde el punto de vista del calculo para metodo y aparato codificador.

Info

Publication number
ES2096481T3
ES2096481T3 ES94922585T ES94922585T ES2096481T3 ES 2096481 T3 ES2096481 T3 ES 2096481T3 ES 94922585 T ES94922585 T ES 94922585T ES 94922585 T ES94922585 T ES 94922585T ES 2096481 T3 ES2096481 T3 ES 2096481T3
Authority
ES
Spain
Prior art keywords
allocation
function
subband signals
values
psychoacoustic
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
ES94922585T
Other languages
English (en)
Inventor
Grant Allen Davidson
Craig Campbell Todd
Mark Franklin Davis
Brian David Link
Louis Dunn Fielder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dolby Laboratories Licensing Corp
Original Assignee
Dolby Laboratories 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
Priority claimed from US08/145,975 external-priority patent/US5632003A/en
Application filed by Dolby Laboratories Licensing Corp filed Critical Dolby Laboratories Licensing Corp
Application granted granted Critical
Publication of ES2096481T3 publication Critical patent/ES2096481T3/es
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H04B1/667—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 a division in frequency subbands

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

LA INVENCION SE REFIERE A MODELOS PERCEPTUALES SOFISTICADOS DE ALTO RENDIMIENTO COMPUTACIONAL QUE PUEDEN CONSTITUIR UNA BASE PARA LA DISTRIBUCION DE BITS Y CUANTIFICACION ADAPTABLES DE LA INFORMACION CODIFICADA UTILES EN SISTEMAS DE CODIFICACION A BAJA VELOCIDAD DE TRAFICO DE BITS DE ALTA CALIDAD. EN UN ASPECTO DE LA INVENCION, UN CODIFICADOR DE BANDA DIVIDIDA DE AUDIO DIVIDE UNA SEÑAL DE ENTRADA EN SEÑALES DE SUBBANDA DE FRECUENCIA, CUANTIFICA LAS SEÑALES DE SUBBANDA SEGUN LOS VALORES ESTABILIZADOS POR UNA FUNCION DE DISTRIBUCION Y AGRUPA LAS SEÑALES DE SUBBANDA CUANTIFICADAS EN UNA SEÑAL CODIFICADA. LA FUNCION DE DISTRIBUCION ESTABLECE VALORES DE DISTRIBUCION SEGUN UNOS PRINCIPIOS PSICOACUSTICOS BASADOS EN UN UMBRAL DE ENMASCARAMIENTO. EL UMBRAL DE ENMASCARAMIENTO SE ESTABLECE ESTIMANDO LA DENSIDAD ESPECTRAL DE POTENCIA (PSD) DE LA SEÑAL DE ENTRADA, GENERANDO UN PATRON DE EXCITACION MEDIANTE LA APLICACION DE UNA FUNCION DE PROPAGACION A LA PSD, AJUSTANDO EL PATRON DE EXCITACION EN UNA CANTIDAD IGUAL A LA RELACION SEÑAL A RUIDO (SNR) DESPLAZADA LO SUFICIENTE COMO PARA CONSEGUIR UN ENMASCARAMIENTO PSICOACUSTICO, COMPARANDO EL NIVEL DEL PATRON AJUSTADO CON EL UMBRAL DE ESCUCHA Y GENERANDO UN UMBRAL DE ENMASCARAMIENTO QUE SEA IGUAL AL MAYOR DE LOS DOS. LA FUNCION DE PROPAGACION SE PUEDE LLEVAR A CABO APLICANDO UNO O MAS FILTROS NO RECURSIVOS A LA PSD DE LA SEÑAL DE ENTRADA. EN SISTEMAS DE CODIFICACION ADAPTABLE HACIA ADELANTE, LOS VALORES DE DISTRIBUCION SON TRANSFERIDOS EXPLICITAMENTE A UN DECODIFICADOR MEDIANTE LA INFORMACION AGRUPADA EN LA SEÑAL CODIFICADA. EN SISTEMAS DE CODIFICACION ADAPTABLE HACIA ATRAS, LOS VALORES DE DISTRIBUCION SON TRANSFERIDOS IMPLICITAMENTE A UN DECODIFICADOR MEDIANTE LA INFORMACION AGRUPADA EN LA SEÑAL CODIFICADA DE LA QUE UNA FUNCION DE DISTRIBUCION DEL DECODIFICADOR PUEDE DERIVAR LOS VALORES DE DISTRIBUCION. EN SISTEMAS DE CODIFICACION ADAPTABLE HIBRIDA, LOS VALORES DE DISTRIBUCION BASICOS SON TRANSFERIDOS IMPLICITAMENTE CON LOS VALORES DE DISTRIBUCION MODIFICADOS TRANSFERIDOS EXPLICITAMENTE.
ES94922585T 1993-07-16 1994-07-18 Asignacion binaria adaptable eficaz desde el punto de vista del calculo para metodo y aparato codificador. Expired - Lifetime ES2096481T3 (es)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US9226993A 1993-07-16 1993-07-16
US08/145,975 US5632003A (en) 1993-07-16 1993-11-01 Computationally efficient adaptive bit allocation for coding method and apparatus

Publications (1)

Publication Number Publication Date
ES2096481T3 true ES2096481T3 (es) 1997-03-01

Family

ID=26785469

Family Applications (1)

Application Number Title Priority Date Filing Date
ES94922585T Expired - Lifetime ES2096481T3 (es) 1993-07-16 1994-07-18 Asignacion binaria adaptable eficaz desde el punto de vista del calculo para metodo y aparato codificador.

Country Status (10)

Country Link
US (1) US5623577A (es)
EP (1) EP0709005B1 (es)
JP (1) JP3297051B2 (es)
AT (1) ATE147909T1 (es)
AU (1) AU694131B2 (es)
CA (1) CA2166551C (es)
DE (1) DE69401514T2 (es)
DK (1) DK0709005T3 (es)
ES (1) ES2096481T3 (es)
WO (1) WO1995002930A1 (es)

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Also Published As

Publication number Publication date
EP0709005B1 (en) 1997-01-15
DE69401514T2 (de) 1997-06-12
US5623577A (en) 1997-04-22
AU7364294A (en) 1995-02-13
AU694131B2 (en) 1998-07-16
ATE147909T1 (de) 1997-02-15
DE69401514D1 (de) 1997-02-27
JPH09500503A (ja) 1997-01-14
WO1995002930A1 (en) 1995-01-26
CA2166551A1 (en) 1995-01-26
JP3297051B2 (ja) 2002-07-02
EP0709005A1 (en) 1996-05-01
CA2166551C (en) 2005-10-11
DK0709005T3 (da) 1997-07-14

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