Method and apparatus for collecting errors in the digital data of a television signal
US4873689A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 6, 1988 |
| Grant date | Oct 10, 1989 |
| Priority date | — |
| Expiry date | Jun 6, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/15
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for correcting errors in the digital data of a television signal, wherein the digital signals are Golay codes having 23 bits constituted by two parts: a message and a redundance. If there are between zero and three errors to be corrected, there are 2048 possible cases, whose examination one by one would be too time-consuming and/or too expensive in a memory. However, if there are two errors in one of the parts, there cannot be more than one error in the other part. Therefore, in a first case, one of the parts does not comprise errors and serves to recreate the other part (1-8) completely. In the other case, one of the parts comprises only one error: there is started from this part; the different bits susceptible to being affected by the single error thereof are modified in turn (9,12) and there is each tiem verified (10,13,15) whether the other part could correspond to the modified part. The total number of tests is thus strongly limited.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.