System for negotiating at least two sets of video capabilities between two nodes to perform video conferencing between the nodes according to the selected set
US5774674A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Jun 30, 1998 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/13389
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Nodes of a computer-based teleconferencing network may be able to encode and decode video signals using different video compression/decompression algorithms with different parameters. In order to conduct a video teleconference between two (or more) such nodes, the nodes must first agree on what video algorithms to use. In the present invention, video capabilities are negotiated between nodes, where each node uses a table that identify one or more sets of video capabilities for that node. After video capabilities have been successfully negotiated, the video conferencing can proceed using the negotiated capabilities. Negotiated video capabilities may include algorithms, frame rate, frame resolution, bit rate, and bitstream format.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.