Error recovery in an audio-video multipoint control component
US8189492B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 2009 |
| Grant date | May 29, 2012 |
| Priority date | — |
| Expiry date | Sep 12, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/6375
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Architecture for enabling a communications endpoint to quickly recover from a packet loss, reducing duration of a signal dropout. A communications component sends a downlink of dependency-structured signals, such as audio and/or video signals using compressed frames between key frames. A multipoint control component (MCC) is located between the communications component and multiple endpoints, and distributes the downlink to the multiple endpoints. A frame caching component caches a key frame of the downlink. If a key frame is lost at one of the endpoints, the endpoint sends a packet loss report to the frame caching component. The key frame is resent from the frame caching component to the endpoint in response to the key frame loss. In this way, the frame caching component can respond to specific frame loss situations on any of the endpoints, without interfering with the performance on the other endpoints.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.