Inverse discrete cosine transform processor for VLSI implementat

Details Inverse discrete cosine transform processor for VLSI implementat Inverse discrete cosine transform processor for VLSI implementat

1995-08-28

1997-12-23

Elmore, Reba I.

Boots, shoes, and leggings

G06F 1714

Patent

active

057012636

ABSTRACT:
A fast and efficient implementation of the inverse discrete cosine transform (IDCT). The disclosed IDCT processor achieves a good balance between efficient VLSI implementation and number of needed arithmetic operations and is thus particularly useful in real-time speech and video decompression applications. A standard IDCT computation is modified by factoring an IDCT formula into two parts: a prescaling of each input value followed by a multiplication with a matrix specially chosen so that the product will represent the IDCT of the input data. The premultiply constants are chosen so that the specially chosen matrix has a limited number of distinct values. The VLSI implementation of the matrix multiplication is thus greatly simplified.

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Rao, K.R. and Yip, P., "Discrete Cosine Transforms: Algorithms, Advantages, Applications," Chapter 5, Two-Dimensional DCT Algorithms, pp. 88-121, Academic Press, 1990.

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