Error correction method and apparatus for data broadcasting system
US4630271A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 17, 1984 |
| Grant date | Dec 16, 1986 |
| Priority date | — |
| Expiry date | Jan 17, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/43
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A random multi-error correcting code having a maximum length block in a packet, for instance a majority logic decodable (272, 190) shortened difference set cyclic code, is used for error correction in a character code broadcasting system. The error correcting ability of this code is increased. The correction is made by decreasing a threshold value, so that the error correcting ability is improved. A framing timing extraction circuit and a phase lock circuit for the framing timing are eliminated, so that the amount of hardware needed is reduced. Preferably, the error correcting code is superposed on the television signal during the vertical blanking period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.