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caor
               robotics lab


analyse et compression des
signaux audio numériques
           s. boisgérault

        Enseignement Spécialisé
       Mathématiques et Systèmes
              6 juin 2011
technologies de compression
sans perte / générique
 z, gzip, bzip2, rar, 7z, ...

             sans perte / audio.
             alac, flac, shn, ape, ...

                         avec perte / audio.
                        mp3, aac, vorbis, celt, ...

                                     avec perte / voix
                                  gsm, g.7xx, speex, silk, ...
enseignement spécialisé

1 ECTS / 10 séances, semestre 4 ou 6,

Concepts, Algorithmes & Mise en oeuvre,

Codage de source :
un seul maillon de la chaîne de communication numérique

Basique: Traitement du Signal 101 (partiel !)
          +
Avancé: Compression Audio/Voix
fondations - 6 séances
   codage entropique
                                        analyse fréquentielle
  Théorie de l'information
- Codages statistiques,                - Signaux & filtres,
- Codages par dictionnaires.           - Représentations fréquentielles,
                                       - Traitement multicadence.
      quantification
- antification scalaire,                  voix et audition
- antification vectorielle.
                                       - Modèles de synthèse vocale,
                                       - Modèles psycho-acoustiques.
         prédiction
                                      Référence: N. Moreau,
  Identif. de modèles paramétriques
                                      Techniques de compression des signaux
- Prédiction Linéaire.
études de cas - 4 séances
                 travaux pratiques
  Outils - Introduction                     Codage audio sans pertes

Codage de la voix - CELP                 Codage perceptuel & sous-bandes


                            outils
    Langage                  Calcul Numérique                Visualisation


              Fichiers & flux binaires              Edition Audio
exemples de mini-projets

    Détection de sons voisés     Supression automatique d'écho


   Estimation précise du pitch   Conception de codeurs Multipulse


Implémentation codeur SHORTEN     Implémentation décodeur FLAC


   Audiogramme & Masquage                      …

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ACSAN

  • 1. caor robotics lab analyse et compression des signaux audio numériques s. boisgérault Enseignement Spécialisé Mathématiques et Systèmes 6 juin 2011
  • 2. technologies de compression sans perte / générique z, gzip, bzip2, rar, 7z, ... sans perte / audio. alac, flac, shn, ape, ... avec perte / audio. mp3, aac, vorbis, celt, ... avec perte / voix gsm, g.7xx, speex, silk, ...
  • 3. enseignement spécialisé 1 ECTS / 10 séances, semestre 4 ou 6, Concepts, Algorithmes & Mise en oeuvre, Codage de source : un seul maillon de la chaîne de communication numérique Basique: Traitement du Signal 101 (partiel !) + Avancé: Compression Audio/Voix
  • 4. fondations - 6 séances codage entropique analyse fréquentielle Théorie de l'information - Codages statistiques, - Signaux & filtres, - Codages par dictionnaires. - Représentations fréquentielles, - Traitement multicadence. quantification - antification scalaire, voix et audition - antification vectorielle. - Modèles de synthèse vocale, - Modèles psycho-acoustiques. prédiction Référence: N. Moreau, Identif. de modèles paramétriques Techniques de compression des signaux - Prédiction Linéaire.
  • 5. études de cas - 4 séances travaux pratiques Outils - Introduction Codage audio sans pertes Codage de la voix - CELP Codage perceptuel & sous-bandes outils Langage Calcul Numérique Visualisation Fichiers & flux binaires Edition Audio
  • 6. exemples de mini-projets Détection de sons voisés Supression automatique d'écho Estimation précise du pitch Conception de codeurs Multipulse Implémentation codeur SHORTEN Implémentation décodeur FLAC Audiogramme & Masquage …