5 Pages

Browsing and Visualisation of Recorded Collaborative Meetings on Small Devices

The overall architecture of HANMER and related components is shown in Figure 1. The components on the top half of the diagram are part of COMAP. They consist of a meeting recorder and a preprocessor. The recorder includes functionality to allow two or more users of desktop computers to communicate synchronously over an audio channel while working collaboratively on a shared text editor (Masoodian & Luz, 2001). The system makes extensive use of the Real Time Protocol (RTP) which supports synchronous multi-party communication over multicast-enabled networks (Schulzrine, Casner, Frederick, & Jacobson, 1999). Recording is started as soon as the first user joins the session and continues until the last user leaves it. RTP packets are stored as they arrive in order to preserve time-stamping, source, synchronisation and other control data. For scenarios in which the mobile devices have access to a wireless LAN or similar connectivity, a direct connection between mobile devices and the recording server could be considered to enable mobile clients to request streaming of the desired audio and text segments. However, we have not exploited this possibility so far. At the moment, a synchronisation server is used.