Low-complexity spectral analysis/synthesis using selectable...

G - Physics – 10 – L

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G10L 19/02 (2006.01)

Patent

CA 2698039

The signal processing is based on the c oncept of using a time-domain aliased (12, TDA) frame as a basis for time segmen tation (14) and spectral analysis (16), performing segmentation in time based on the time-domain aliased frame and performing spectral analysis based on the resulting time segments. The time resolution of the overall ?segmented? time-to-frequenc y transform can thus be changed by simply adapting the time segmentation to ob tain a suitable number of time segments based on which spectral analysis is applied. The overall set of spectral coefficients, obtained for all the segments, provides a selectable time-frequency tiling of the original signal frame.

L'invention porte sur un traitement des signaux dont le concept consiste : à utiliser une trame repliée dans le domaine temporel (12, TDA) comme base de segmentation temporelle (14) et d'analyse spectrale (16); à effectuer une segmentation temporelle fondée sur la trame repliée dans le domaine temporel; et à effectuer une analyse spectrale sur la base des segments temporels obtenus. L'invention permet par conséquent de modifier la résolution temporelle de la transformée temps-fréquence "segmentée" totale en adaptant simplement la segmentation temporelle afin d'obtenir un nombre adéquat de segments temporels sur la base desquels on applique l'analyse spectrale. L'ensemble total de coefficients spectraux obtenus pour tous les segments fournit un pavage temps-fréquence sélectionnable de la trame de signaux originale.

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