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A Memory and Computationally Efficient Synthesis Sub-band Filter for MPEG Audio Decoding

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This article proposes a novel method for memory and computationally efficient implementation of sub-band synthesis filter for MPEG audio decoding. In contrast to conventional approach, this derived approach proposes to compute 64 sets of windowing operations in the beginning each with eight input samples and four re-arranged window co-efficient. Subsequently these windowed sequences are used for two matrixing operations. The proposed fast algorithm exploits not only the DCT relationship for matrixing operations but also procedure pruning for required DCT co-efficient computations. Moreover, the windowing operations make use of the symmetry exist in the window co-efficient array. Additionally, the derived approach eliminates the intermediate arrays and explicit filtering operation by appropriately merging these in to the windowing and matrixing operations itself. This yields a benefit in reducing the memory requirement and also involved data transfers while computing.

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