Recycling and parallel processing method and apparatus for perfo

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364736, 364754, G06F 738, G06F 752

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active

054714125

ABSTRACT:
A discrete cosine transform (DCT) apparatus, capable of generating one-dimensional and two-dimensional DCT and inverse DCT results, uses six-stage DCT/IDCT fast algorithms to process a sequence of input data of an 8.times.8 data block. Each of the different stages of the DCT/IDCT fast algorithms involves a number of butterfly operations, which can be performed by a butterfly operation unit of the DCT apparatus, or a number of intrinsic multiplications, a number of post-addition multiplication operations, or a number of post-multiplication subtraction operations, all of which can be performed by a multiplication operation unit. A control unit of the DCT apparatus permits the use of a single butterfly operation unit and a single multiplication operation unit to perform the different stages of the DCT/IDCT fast algorithms. The results of each stage of the DCT/IDCT fast algorithms are stored in a data register unit of the DCT apparatus to serve as inputs for the succeeding stages of the DCT/IDCT fast algorithms.

REFERENCES:
patent: Re34734 (1994-09-01), Cambonie
patent: 5029122 (1991-07-01), Uetani
patent: 5257213 (1993-10-01), Kim et al.
patent: 5329318 (1994-07-01), Keith

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