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Abstract:
Although H.323 seems to become a kind of standard for video conferencing in fusion research and although the sound in VRVS meetings is sometimes really terrible, VRVS is still the favorite conferencing system to participate in JET meetings, sessions, and workshops. This and the old (in the mean-time solved?) incompatibility between some H.323 systems and VRVS made it necessary to find a solution for ASDEX Upgrade to participate in the JET VRVSmeetings. It will be shown how the existing audio and video system in the ASDEX Upgrade seminar room was extended to serve – without removing its dedication to the well functioning Tandberg 6000 H.323 VC system - as a front-end for genuine mbone VRVS sessions. Using the high-end audio components available, a significant improvement of the audio quality could be achieved. However, the show-stopper in this extension is the integration of a dedicated professional echo-cancelling device into the VRVS audio signal path. The extended audio system in the seminar room now allows informal and fluent discussions in “full duplex” mode (loudspeaker and microphones simultanously open) during mbone VRVS sessions.
