Discrete cosine transforming apparatus

Details Discrete cosine transforming apparatus Discrete cosine transforming apparatus

1989-12-27

1991-07-02

Shaw, Dale M.

Boots, shoes, and leggings

G06F 738

Patent

active

050291220

ABSTRACT:
A discrete cosine transforming apparatus for exercising a 2.sup.n+1 th order discrete cosine transform includes a plurality of basic arithmetic circuits A including circuits for temporarily storing input data and adding the input data or subtracting the input data one from the other, and a plurality of another basic arithmetic circuits B including circuits for temporarily storing input data and adding the input data or subtracting the multiplication result data obtained by multiplying the sum or subtraction result by a multiplier that is equal to or less than the input data. The basic arithmetic circuit A is located at a first stage, and then the basic arithmetic circuit B and the arithmetic circuit A are alternately arranged, thereby to form a cascade connection of "n" stages. For the inverse transform, the same circuit arrangement as that for the cosine transform is used and the direction of a signal flow is inversed.

REFERENCES:
patent: 4385363 (1983-05-01), Widergren et al.
patent: 4841464 (1989-06-01), Guichard et al.

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