Video data transmission method for changing transmission data amounts in accordance with a transmission speed and a transmission system therefor
US7558323B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 2003 |
| Grant date | Jul 7, 2009 |
| Priority date | — |
| Expiry date | Mar 14, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/64769
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a picture transmission network including networks of different transmission speeds, when a picture is sent at a bit rate which is adjusted to the transmission speed of a low-speed network, only a low-quality picture of a low bit rate is obtained in a video reception unit connected to a network of a high transmission speed. When a picture is sent at a transmission rate of a network having high transmission speed, the picture cannot be reproduced at all in a video reception unit connected to a network of a low transmission speed. To solve the problem, a video transmission unit generates at least an I picture data and a plurality of P picture data. In accordance with a request from the network, the I picture data and a predetermined number of P picture data is transmitted to the network.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.