Improved coding techniques using estimated spectral...

G - Physics – 10 – L

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G10L 19/02 (2006.01) G06F 17/14 (2006.01)

Patent

CA 2553784

Estimates of spectral magnitude and phase are obtained by an estimation process using spectral information from analysis filter banks such as the Modified Discrete Cosine Transform. The estimation process may be implemented by convolution-like operations with impulse responses. Portions of the impulses responses may be selected for use in the convolution-like operations to trade off between computational complexity and estimation accuracy. Mathematical derivations of analytical expressions for filter structures and impulse responses are disclosed.

L'invention concerne des estimations d'amplitude et de phase spectrales obtenues au moyen d'un procédé d'estimation mettant en oeuvre des informations spectrales provenant de banques de filtres d'analyses, telles que la transformée en cosinus discrète modifiée. Le procédé d'estimation peut être mis en oeuvre au moyen d'opérations de type convolution avec des réponses d'impulsions. Des parties des réponses d'impulsions peuvent être sélectionnées aux fins d'utilisation dans les opérations de type convolution de manière à faire un compromis entre la complexité informatique et la précision des estimations. L'invention concerne également des dérivations mathématiques d'expressions analytiques destinées à des structures de filtres et des réponses d'impulsions.

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