Lip synchronization for audio/video transmissions over a network
US7693190B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 2006 |
| Grant date | Apr 6, 2010 |
| Priority date | — |
| Expiry date | Apr 12, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In one embodiment, a system includes a video mixer coupled with an audio mixer for exchange of information that includes a first set of delay values respecting input audio streams received by the audio mixer from a plurality of source endpoints, and output audio streams sent from the audio mixer to a plurality of destination endpoints. The information further including a second set of delay values respecting the corresponding input video streams. The audio mixer calculates end-to-end video delays, and the video mixer calculates end-to-end audio delays. The audio mixer delays the output audio streams to equalize the end-to-end audio and video delays in the event that the end-to-end audio delays are less than the end-to-end video delays, and the video mixer delays the output video streams to equalize the end-to-end audio and video delays in the event that the end-to-end video delays are less than the end-to-end audio delays.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.