Method, encoder and decoder for resynchronization to a data stream which contains errors
US5838265A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 23, 1996 |
| Grant date | Nov 17, 1998 |
| Priority date | — |
| Expiry date | May 23, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/70
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
When digital data are being transmitted, parts of these data can be irreversibly destroyed by channel interference. Gaps produced in this way in the bit stream must be indicated and the respective decoder must be resynchronized. When encoding in accordance with the MPEG2 standard is used, the timing of this resynchronization is heavily dependent on the contents of the bit stream elements which have been lost. Thus, in the event of failure of the picture start codes or extension start codes of the frame layer which are important for the decoding, although the decoder will resynchronize to the slice-start code of the following slice layer, important information such as the time reference of the frame, for example, the frame type (I-, P-, B-frame) or else important parameters relating to the decoding of movement vectors may be false in this case, however. The result of this is that the decoder cannot decode at least one frame, it being possible for consequential errors to occur in addition, if frames which are to be predicted later are based on the missing frame. According to the invention, additional information is thus inserted into the slice header, which information contains the m…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.