Systeme et procede de masquage du bruit de quantification de signaux audio

System and method for masking quantization noise of audio signals

Abstract

A system and method for processing an audio signal and including a scalable audio coder (300) and a decoder. The coder (300) includes a multi-resolution transform processor (310), such as a modulated lapped transform (MLT) transform processor, a weighting processor (312), a uniform quantizer (314), a masking threshold spectrum processor (316), an entropy encoder (318), and a communication device (320), such as a multiplexor (MUX) for multiplexing (combining) signals received from the above components for transmission over a single medium. The coder (300) encodes the audio signal by resolution switching, spectral weighting and digital encoding the audio signal. Also, parametric modeling of the digitally encoded signal is performed to enhance encoding. The decoder comprises inverse components of the coder (300) for decoding the encoded audio signal.
L'invention porte sur un système et sur un procédé de traitement d'un signal audio, ce système comprenant un codeur (300) audio et un décodeur à échelles multiples. Le codeur (300) comprend un processeur (310) de transformée multi-résolution tel qu'un processeur à transformée MLT (demodulated lapped transform). Un processeur (312) de pondération, un quantificateur (314) uniforme, un processeur (316) à spectre de seuil de masquage, un codeur (318) entropique et un dispositif (320) de communication tel qu'un multiplexeur (MUX) destiné à multiplexer (combiner) des signaux provenant des composants précités lors d'une transmission sur un support unique. Le codeur (300) code le signal audio par commutation par résolution, pondération spectrale et codage numérique. Une modélisation paramétrique du signal codé numériquement est également effectuée pour améliorer le codage. Le décodeur intègre des composantes inversées du codeur (300) de façon à détecter le signal audio codé.

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Patent Citations (3)

    Publication numberPublication dateAssigneeTitle
    US-5692102-ANovember 25, 1997Motorola, Inc.Method device and system for an efficient noise injection process for low bitrate audio compression
    US-5757938-AMay 26, 1998Sony CorporationHigh efficiency encoding device and a noise spectrum modifying device and method
    WO-9621975-A1July 18, 1996Philips Electronics N.V., Philips Norden AbProcede et appareil pour determiner un seuil masque

NO-Patent Citations (8)

    Title
    BOLAND S ET AL: "Multiresolution source coding of high quality digital audio using perfect reconstruction M-band filter banks", FOURTH INTERNATIONAL SYMPOSIUM ON SIGNAL PROCESSING AND ITS APPLICATIONS. ISSPA 96. PROCEEDINGS MAIN SYMPOSIUM, PROCEEDINGS OF FOURTH INTERNATIONAL SYMPOSIUM ON SIGNAL PROCESSING AND ITS APPLICATIONS, GOLD COAST, QLD., AUSTRALIA, 25-30 AUG. 1996, 1996, Brisbane, Qld., Australia, Queensland Univ. Technol, Australia, pages 93 - 96 vol.1, XP002116241, ISBN: 1-86435-209-4
    CHEUNG S ET AL: "INCORPORATION OF BIORTHOGONALITY INTO LAPPED TRANSFORMS FOR AUDIO COMPRESSION", PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH, AND SIGNAL PROCESSING (ICASSP), DETROIT, MAY 9 - 12, 1995 SPECIAL SESSIONS/ AUDIO AND ELECTROACOUSTICS/ UNDERWATER ACOUSTIC SIGNAL PROCESSING/ VERY LARGE SCALE INTEGRATION FOR SIGNAL P, vol. 5, no. CONF. 20, 9 May 1995 (1995-05-09), INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages 3079 - 3082, XP000534729, ISBN: 0-7803-2432-3
    DEEPEN SINHA ET AL: "LOW BIT RATE TRANSPARENT AUDIO COMPRESSION USING ADAPTED WAVELETS", IEEE TRANSACTIONS ON SIGNAL PROCESSING, vol. 41, no. 12, 1 December 1993 (1993-12-01), pages 3463 - 3479, XP000426659, ISSN: 1053-587X
    JOHNSTON J D: "TRANSFORM CODING OF AUDIO SIGNALS USING PERCEPTUAL NOISE CRITERIA", IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS,US,IEEE INC. NEW YORK, vol. 6, no. 2, pages 314-323, XP002003779, ISSN: 0733-8716
    MAHIEUX Y ET AL: "HIGH-QUALITY AUDIO TRANSFORM CODING AT 64 KBPS", IEEE TRANSACTIONS ON COMMUNICATIONS, vol. 42, no. 11, 1 November 1994 (1994-11-01), pages 3010 - 3019, XP000475155, ISSN: 0090-6778
    MALVAR H S: "Biorthogonal and nonuniform lapped transforms for transform coding with reduced blocking and ringing artifacts", IEEE TRANSACTIONS ON SIGNAL PROCESSING, APRIL 1998, IEEE, USA, vol. 46, no. 4, pages 1043 - 1053, XP002116240, ISSN: 1053-587X
    MALVAR H: "Enhancing the performance of subband audio coders for speech signals", ISCAS '98. PROCEEDINGS OF THE 1998 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (CAT. NO.98CH36187), ISCAS '98 PROCEEDINGS OF THE 1998 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS, MONTEREY, CA, USA, 31 MAY-3 JUNE 1998, 1998, New York, NY, USA, IEEE, USA, pages 98 - 101 vol.5, XP002116239, ISBN: 0-7803-4455-3
    PAN D: "A TUTORIAL ON MPEG/AUDIO COMPRESSION", IEEE MULTIMEDIA, vol. 2, no. 2, 1 January 1995 (1995-01-01), pages 60 - 74, XP000525989, ISSN: 1070-986X

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