Digital broadcast system having transmission apparatus and receiving apparatus
US7286601B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 14, 2003 |
| Grant date | Oct 23, 2007 |
| Priority date | — |
| Expiry date | Jun 21, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A broadcast system has digital receiving apparatuses that imitate deteriorated reproduction that is observed in analog receiving apparatuses when a transmission path failure occurs, thus preventing the audiences, who are accustomed to the analog broadcasting, from sensing discomfort at the digital broadcasting. A transmission apparatus causes encoding units 11 and 12 to generate low- and high-quality streams based on the same contents, and transmits these streams onto a transmission path while delaying the high-quality stream. In the receiving apparatuses, a reproduction unit 25 reproduces the high-quality stream in a normal state, while packets of the low-quality stream received during a time period T until the current time are accumulated in an accumulation unit 22. If a transmission path failure occurs, a reproduction control unit 26 causes the reproduction unit 25 to reproduce, instead of the high-quality stream, the accumulated packets of the low-quality stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.