Fast algorithms for computation of 5-point dct-ii, dct-iv,...

Details Fast algorithms for computation of 5-point dct-ii, dct-iv,... Fast algorithms for computation of 5-point dct-ii, dct-iv,...

G - Physics

10

L

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

Patent

CA 2706283

A more efficient encoder/decoder is provided in which an N-point MDCT transform is mapped into smaller sized N/2-point DCT-IV, DST-IV and/or DCT-II transforms. The MDCT may be systematically decimated by factor of 2 by utilizing a uniformly scaled 5-point DCT-II core function as opposed to the DCT-IV or EFT cores used in many existing MDCT designs in audio codecs. Various transform factorizations of the 5-point transforms may be implemented to more efficiently implement a transform.

L'invention concerne un codeur / décodeur de rendement amélioré, dans lequel une transformée MDCT sur N points est interpolée pour donner des transformées DCT-IV, DST-IV et / ou DCT-II de plus petites dimensions sur N/2 points. La MDCT peut être systématiquement décimée d'un facteur 2 en utilisant une fonction de noyau DCT-II sur 5 points à facteur d'échelle uniforme, par opposition aux noyaux DCT-IV ou FFT utilisés dans de nombreux modèles existants de MDCT dans les codecs audio. Diverses factorisations des transformées sur 5 points peuvent être mises en uvre pour obtenir une transformée avec un meilleur rendement.

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