Coder
US7839312B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 2007 |
| Grant date | Nov 23, 2010 |
| Priority date | — |
| Expiry date | Jan 10, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/70
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A coder has a binarizing circuit (130) for converting multivalued data into a binary symbol sequence, the multivalued data being generated from an input signal and having a plurality of contexts, an arithmetic code amount approximating circuit (200) for calculating a prediction code amount in the predetermined coding unit from the binary symbol sequence, and a coding circuit (102) for coding the input signal arithmetically on the basis of the prediction code amount. The arithmetic code amount approximating circuit (200) includes a selector (230) for dividing the binary symbol sequence into a plurality of groups based on the contexts, a plurality of code amount approximating circuits (211-214) for calculating, from the binary symbol sequence divided into a plurality of groups, the prediction code amount of the group based on at least the section range in arithmetic coding, and an adder (231) for adding the prediction code amounts from all code amount approximating circuits and outputting the prediction code amount in the specified coding unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.