Conversion of synthesized spectral components for encoding...

G - Physics – 10 – L

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G10L 19/14 (2006.01)

Patent

CA 2512866

In an audio coding system, an encoding transmitter represents encoded spectral components as normalized floating-point numbers. The transmitter provides first and second control parameters that may be used to transcode the encoded spectral parameters. A transcoder uses first control parameters to partially decode the encoded components and uses second control parameters to re-encode the components. The transmitter determines the second control parameters by analyzing the effects of arithmetic operations in the partial-decoding process to identify situations where the floating-point representations lose normalization. Exponents associated with the numbers that lose normalization are modified and the modified exponents are used to calculate the second control parameters.

Dans un système de codage audio, un transmetteur de codage représente des composants spectraux codés en tant que nombres à virgule flottante normalisés. Le transmetteur fournit de premiers et deuxièmes paramètres pouvant servir au transcodage des paramètres spectraux codés. Un transcodeur emploie des premiers paramètres de commande afin de décoder partiellement les composants codés, et emploie des deuxièmes paramètres de commande afin de recoder les composants. Le transmetteur détermine les deuxièmes paramètres de commande par analyse des effets d'opérations arithmétiques dans le processus de décodage partiel, de manière à identifier des situations dans lesquelles les représentations à virgule flottante perdent leur normalisation. Des exposants associés aux nombres perdant leur normalisation sont modifiés puis employés dans le calcul des deuxièmes paramètres de commande.

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