Method and apparatus for modifying tables of data
US6438171B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1999 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | Jun 11, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/2365
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Tables of data included in a digital stream of encoded data, e.g. a digital transport stream of a digitally compressed television signal, are modified. The tables of data are extracted from the stream and the extracted tables are processed to identify data that are to be dropped. A filter is used to filter out the identified data and new local data is entered into the extracted tables to replace dropped data and thereby form modified tables of data. The filtered stream is multiplexed with the modified tables of data to form an output digital stream. The constantly updated tables in the input stream are modified only in respect of the local changes and the updates are passed through to the output stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.