| 摘要 |
Conversion between sub-band field representations for time-dependent filter banks. The invention relates to a transcoding processing operation between different sub-band fields, aiming to compact the application of a first vector representing the signal in a first sub-band field to a synthesis filter bank, and then to an analysis filter bank, in order to obtain a second vector representing the signal in a second sub-band field. In particular, the synthesis bank and/or the analysis bank are time-dependent. Within the scope of the invention, matrix filtering of the first vector is anticipated in order to directly obtain the second vector, this matrix filtering being represented by a global conversion matrix comprising pre-calculated sub-blocks of matrices (Ai0, . . . , Aip2-1) taking into consideration possible time-dependent variations in the filter banks, then stored into memory. The global conversion matrix is then constructed by calls to the memory in order to obtain the sub-blocks at pre-calculated successive instants.
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