Modulation method, modulator, transmission apparatus and recording medium
US6492920B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 2001 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Oct 26, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/1473
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A coding table portion includes six coding tables each storing a code word and status information indicating a coding table for use in modulating a next input data word in order to obtain a next code word which satisfies a predetermined run length restriction rule even if the next code word is coupled directly with the preceding code word, corresponding to each input data word. In the coding table portion, the code words and status informations allocated corresponding to input data words of a number set up preliminarily in succession from the highest appearance frequency to a lower one in one or more coding tables of the plural coding tables are replaced with code words having smaller RDSs and status informations allocated corresponding to other input data words in the same coding table. Consequently, the input data word is modulated using the six coding tables.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.