Discrete cosine transform circuit suitable for integrated circuit implementation
US5181183A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 17, 1991 |
| Grant date | Jan 19, 1993 |
| Priority date | — |
| Expiry date | Jan 17, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/60
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A discrete cosine transform (DCT) circuit providing DCT and inverse DCT results, receiving N input data and a selection signal, includes a first switch for selecting input data or accumulation data, a combining circuit transforming N input data into N/2 combination data, an adding/substracting circuit producing N subtraction and addition data from the combination data, a second switch for selecting one of the input data and the accumulation data, a permutation circuit producing permutated data based on the input data, a third switch for selecting one of the addition and subtraction data and the permutated data, a plurality of transforming circuits coupled to the third switch for transforming and accumulating data to produce the accumulation data, a fourth switch selecting one of the addition and substraction data and the permutated data and a selector circuit operatively coupled to the first and second switches for selecting the outputs of the transforming circuits in a predetermined order. According to one aspect of the invention one of a DCT result and an inverse DCT result are produced in the DCT circuit based on the selection signal. Both one and two dimension DCT results can b…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.