Error-correction of stored television signals
US5067133A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 18, 1989 |
| Grant date | Nov 19, 1991 |
| Priority date | — |
| Expiry date | Aug 18, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Deterioration of the image as a result of failure of individual memory cells is avoided by storing, together with the data relating to each line of the image field, a code value computed as a function of the value of each data bit in the line and the position of each bit in the line. A picture signal stored in this way may be reproduced by transmitting each line signal to a function generator (15), adder (16) and accumulator (17) to re-compute a code value by the same function utilized during the storage of the signal, and applying the stored code value to a latch (21). The outputs of the accumulator (17) and latch (21) are applied to a subtracting circuit (25), and when the latter produces any output signal other than zero, the value of such signal will indicate both the position of any single faulty bit and the direction in which the stored value is in error.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.