Measuring and regulating synchronization of merged video and audio data
US5874997A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1997 |
| Grant date | Feb 23, 1999 |
| Priority date | — |
| Expiry date | Dec 30, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4341
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This invention concerns real-time assembly of a compressed audio-visual system data stream (22) so the audio and video data may be subsequently presented in synchronism. Assembly of a system data stream (22) in accordance with present invention interleaves packets of data selected from a compressed audio bitstream (16) with packets of data selected from a compressed video bitstream (18). If frames of video data being assembled into the system data stream (22) advance too far ahead of the audio data being assembled into the system data stream (22), then all the data for a single frame of the video signal is omitted from the system data stream (22). Conversely, if frames of video data being assembled into the system data stream (22) lag too far behind the audio data being assembled into the system data stream (22), then a second copy of all the data for a single frame of the video signal is assembled into the system data stream (22).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.