Digit-reversal method and apparatus for computer transforms

Details Digit-reversal method and apparatus for computer transforms Digit-reversal method and apparatus for computer transforms

1986-12-12

1989-04-18

Malzahn, David H.

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364726, G06F 15332

Patent

active

048232971

ABSTRACT:
A computer method and apparatus for permuting data values in fast transforms recognizing patterns in the relationship between indicies i and j to avoid calculating j when i equals j and avoid calculating j when j is less than i. The indicie j is calculated from i in a single multiplication by a power of B and a single addition.

REFERENCES:
patent: 3731284 (1973-05-01), Thies
patent: 3988601 (1976-10-01), Perry
patent: 4181976 (1980-01-01), Collins et al.
patent: 4602350 (1986-07-01), Gray
patent: 4646256 (1987-02-01), Bracewell

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