| 摘要 |
As the number of parties in a video/audio/web/tele-conference increases the number of streams increases if all parties must send/receive streams from all other parties. The invention proposes a media server/multipoint control unit (MCU) to manage and reduce the number of streams. The server receives a stream from the active speaker/floor holder and transmits it to other conference participants. When a change of active speaker is determined, either automatically or by a human moderator, the server establishes a stream from the new presenter and transmits it to the other conference members simultaneously with the old presenter stream. The new presenter stream is transmitted in an invisible manner such that it is not initially displayed to recipients. At an appropriate time the recipients' displays are switched from the old stream to the new `invisible' stream. By overlapping the streams the changeover is carried out with minimal interruptions. The conference participants may use browser based software on PC's or mobile handheld device.
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