Speech and music signal coder/decoder

G - Physics – 10 – L

Patent

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Details

G10L 11/00 (2006.01) G10L 13/02 (2006.01) G10L 19/00 (2006.01) G10L 19/04 (2006.01) G10L 19/06 (2006.01) G10L 19/12 (2006.01) H03M 7/30 (2006.01)

Patent

CA 2335284

A voice/music signal encoder/decoder having a band-division structure for well encoding voice/music signals over the full band. A residual vector is generated by means of an inverted filter (230 ) from a differential vector outputted from a first differential unit (180). A band selecting circuit (250) generates n sub-vectors from an orthogonally-transformed residual vector by using components contained in an arbitrary band. An orthogonal transformation coefficient quantizing circuit (260) quantizes the n sub-vectors.

L'invention concerne un codeur/décodeur de signaux musicaux/vocaux possédant une structure de division de bande permettant de bien coder les signaux musicaux/vocaux dans la bande intégrale. Un vecteur résiduel est généré au moyen d'un filtre inversé (230) à partir d'un vecteur différentiel produit en sortie par une première unité différentielle (180). Un circuit de sélection de bande (250) génère n sous-vecteurs à partir d'un vecteur résiduel transformé de manière orthogonale, au moyen de composants contenus dans une bande arbitraire. Un circuit de quantification de coefficient de transformation orthogonale (260) quantifie les n sous-vecteurs.

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