High speed cosine transform

Details High speed cosine transform High speed cosine transform

1986-06-19

1989-05-09

Harkcom, Gary V.

Boots, shoes, and leggings

G06F 738

Patent

active

048294659

ABSTRACT:
A discrete transform cosine circuit utilizing symmetries of the cosine matrix of coefficients to allow all multiplications to be done by "constant multipliers" comprising combinations of look-up tables and adders. Transform coefficients are developed by dividing each into a sequence of blocks of preselected size, the information in the blocks is sorted to develop a specific order and the reordered blocks are applied seriatim to a first one-dimensional cosine transform circuit employing the constant multipliers. The output of the first cosine transform circuit is applied to a transposing memory and then to a second cosine transform circuit that also employs "constant multipliers".

REFERENCES:
patent: 3988605 (1976-10-01), Guillou et al.
patent: 4152772 (1979-05-01), Speiser et al.
patent: 4196448 (1980-04-01), Whitehouse et al.
patent: 4385363 (1983-05-01), Widergren et al.
patent: 4449194 (1984-05-01), Wilhelm
patent: 4510578 (1985-04-01), Miyaguchi et al.
Smith et al., "A Fast Computational Algorithm for the Discrete Cosine Transform," IEEE Trans. M Communications, vol. COM-25, #9, pp. 1004-1009, Sep. 1977.
Speiser, "Image Transmission via Spread Spectrum Techniques", Arpa Quarterly Technical Report, 1974, pp. B1-B14.

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