Method, apparatus, and system for transforming signals

Details Method, apparatus, and system for transforming signals Method, apparatus, and system for transforming signals

1995-07-05

1996-06-18

Envall, Jr., Roy N.

Boots, shoes, and leggings

G06F 1714

Patent

active

055285287

ABSTRACT:
A transform coefficient matrix is factorized in two submatrices of coefficients. One submatrix is applied to a subword formed of selected input data points and the other submatrix is applied to a subword formed of other selected input data points. This provides two sets of transformed output words. These transformed output data words are then combined. The two subwords may include, respectively, the odd data points and the even data points of the input data word. Alternately, the two subwords may include the high order data points and the low order data points. The transform performed by these operations may be the forward discrete cosine transform or the inverse discrete cosine transform. The submatrices of coefficients may be applied to differences of data points as well as to sums of data points. The differences and sums of data points may be applied to the submatrices of transform coefficients by the use of respective circular buffers.

REFERENCES:
patent: 5029122 (1991-07-01), Uetani
patent: 5204828 (1993-04-01), Kohn
patent: 5249146 (1993-09-01), Uramoto et al.
patent: 5253192 (1993-10-01), Tufts

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