Method and apparatus for recording digital information signals in which, in order to preserve timing, each packet is checked for the presence of program clock reference signal
US6122123A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 1998 |
| Grant date | Sep 19, 2000 |
| Priority date | — |
| Expiry date | Mar 5, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A program is selected from a plurality of programs in an MPEG transport stream for recording on a record carrier. The presence of a program clock reference (PCR) value in a packet in the stream is detected. The packet identifier for the packet is retrieved and stored. Clock reference signals of subsequent packets with a packet identifier equal to the stored packet identifier, are retrieved. The program clock references are used to synchronize a clock counter. Each recorded packet is time stamped according to the clock counter. If clock reference signal is not received within 100 ms, then a packet with a PCR value with a different packet identifier is retrieved and the stored packet identified is replaced by the different packet identifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.