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This letter proposes a fast radix-q algorithm to compute type-IV discrete cosine transform (DCT) of the length qlambda, where q is an odd positive integer. The proposed fast radix-q algorithm has merits in computational complexity, parallelism, and numerical stability over existing algorithms. Furthermore, the fast radix-q algorithm is used to develop the fast mixed-radix type-II/ type-IV DCT algorithm for composite lengths.
Signal Processing Letters, IEEE (Volume:15 )
Date of Publication: 2008