Apparatus for inverse discrete cosine transform
US5724278A · kind A · utility
37Cited by
1References
6Claims
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Key dates
| Filing date | Dec 6, 1995 |
| Grant date | Mar 3, 1998 |
| Priority date | — |
| Expiry date | Dec 6, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F17/147
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An inverse discrete cosine transform apparatus has operation units for operating a combination of plural basic operation matrixes, including rearrangement, addition, subtraction and multiplication. A coefficient C of multiplication is defined as C=cos (n.pi./16) (n:integer), and the basic operation matrixes are represented by equation (6), and operations of matrixes of addition and subtraction are carried out prior to operations of respective matrixes of multiplication.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.