ES2038739T3 - Sistema para codificacion en sub-banda de una senal digital de audio. - Google Patents

Sistema para codificacion en sub-banda de una senal digital de audio.

Info

Publication number
ES2038739T3
ES2038739T3 ES198888200748T ES88200748T ES2038739T3 ES 2038739 T3 ES2038739 T3 ES 2038739T3 ES 198888200748 T ES198888200748 T ES 198888200748T ES 88200748 T ES88200748 T ES 88200748T ES 2038739 T3 ES2038739 T3 ES 2038739T3
Authority
ES
Spain
Prior art keywords
coder
subband
audio signal
signal
block
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
ES198888200748T
Other languages
English (en)
Inventor
Raymond Nicolaas Johan Veldhuis
Robbert Gerbrand Van Der Waal
Marcel Breeuwer
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of ES2038739T3 publication Critical patent/ES2038739T3/es
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10527—Audio or video recording; Data buffering arrangements
    • 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
    • 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
    • G10L19/002—Dynamic bit allocation
    • 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
    • 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
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
    • G10L25/18—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being spectral information of each sub-band

Landscapes

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

Abstract

UN SISTEMA PARA CIFRAR SUBBANDAS DE UNA SEÑAL X(K) DE AUDIO DIGITAL INCLUYE EN EL CIFRADOR (1) UN BANCO DE FILTRO (3) PARA DIVIDIR LA BANDA DE SEÑAL AUDIO, CON MUESTREO DE REDUCCION PROPORCIONADA, EN SUBBANDAS (P=1...P) DE AUDIO DE BANDA CRITICO APROXIMADAMENTE Y EN EL DECODIFICADOR (Z) UN BANCO DE FILTRO (5) PARA UNIR ESAS SUBBANDAS, CON MUESTREO DE INCREMENTO PROPORCIONADO. PARA CADA SUBBANDA (P) EL CODIFICADOR (1) COMPRENDE UN DETECTOR (7(P)) PARA DETERMINAR UN PARAMETRO G (P;M) REPRESENTATIVO DEL NIVEL DE SEÑAL EN UN BLOQUE (P;M) DE M MUESTRAS DE LA SEÑAL DE SUBBANDA XP(K) COMO TAMBIEN UN CUANTIFICADOR (8(P)) PARA PREPARADO EL BLOQUE CUANTIFICAR ESTA SEÑAL DE SUBBANDA EN RESPUESTA AL PARAMETRO G (P;M) Y EL DECODIFICADOR (2) COMPRENDE UN DECUANTIFICADOR 9(P) PARA EL PREPARADO DEL BLOQUE DECUANTIFICAR LA SEÑAL DE SUBBANDA CUANTIFICADA SP(K) EN RESPUESTA AL PARAMETRO G (P;M). LAS CARACTERISTICAS CUANTIFICADAS RELACIONADAS A LA CURVA DE ENMASCARAR RUIDO DEL SISTEMA AUDITIVO HUMANO , QUE SEDEBE A QUE UNA GRAN CUALIDAD DE LA REPLICA X(K) DE LA SEÑAL AUDIO X(K) ES ALCANZADO CON UN NUMERO MEDIO DE APROXIMADAMENTE 2,5 BITS POR MUESTRA PARA REPRESENTAR LA SEÑAL DE SALIDA DEL CODIFICADOR (1). LA AUDIBILIDAD OCASIONAL DE CUANTIFICAR RUIDO EN ESTA REPICLA X (K) ES REDUCIDA EFECTIVAMENTE EN QUE EL CODIFICADOR (1) Y DECODIFICADOR (2) CONTIENEN ELEMENTOS DE ASIGNACION DE BITS IDENTICOS (23, 24) SENSIBLES A UN GRUPO DE PARAMETROS G(P;M) PARA EL GRUPO MAS ALTO DE SUBBANDAS (PIM (MENOR O IGUAL) P (MENOR O IGUAL) ) SIN UNA VENTANA DE ASIGNACION (FIG. 5) PARA ASIGNAR UN NUMERO DE B (P;M) BITS POR MUESTRA DESDE UN NUMERO PREDETERMINADO FIJADO DE B BITS PARA ESTA VENTANA DE ASIGNACION AL CUANTIFICADOR (8(P)) Y EL DECUANTIFICADOR (9(P)) PARA EL BLOQUE (P;M) DE LA SEÑAL DE SUBBANDA X P (K) Y SP (K), RESPECTIVAMENTE.
ES198888200748T 1987-04-27 1988-04-20 Sistema para codificacion en sub-banda de una senal digital de audio. Expired - Lifetime ES2038739T3 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL8700985A NL8700985A (nl) 1987-04-27 1987-04-27 Systeem voor sub-band codering van een digitaal audiosignaal.

Publications (1)

Publication Number Publication Date
ES2038739T3 true ES2038739T3 (es) 1993-08-01

Family

ID=19849916

Family Applications (1)

Application Number Title Priority Date Filing Date
ES198888200748T Expired - Lifetime ES2038739T3 (es) 1987-04-27 1988-04-20 Sistema para codificacion en sub-banda de una senal digital de audio.

Country Status (9)

Country Link
US (2) US4896362A (es)
EP (1) EP0289080B1 (es)
JP (1) JP2732854B2 (es)
KR (1) KR970008640B1 (es)
AT (1) ATE85481T1 (es)
DE (1) DE3878017T2 (es)
ES (1) ES2038739T3 (es)
HK (1) HK88194A (es)
NL (1) NL8700985A (es)

Families Citing this family (150)

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DE3878017D1 (de) 1993-03-18
US5105463A (en) 1992-04-14
JPS63285032A (ja) 1988-11-22
KR880013155A (ko) 1988-11-30
NL8700985A (nl) 1988-11-16
KR970008640B1 (ko) 1997-05-27
ATE85481T1 (de) 1993-02-15
US4896362A (en) 1990-01-23
EP0289080B1 (en) 1993-02-03
HK88194A (en) 1994-09-02
JP2732854B2 (ja) 1998-03-30
EP0289080A1 (en) 1988-11-02

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