Multimedia data such as music and video are key forces behind the widespread use of mobile devices today. However, the usefulness of mobile access to multimedia sources extends beyond entertainment. The popularisation of teleconferencing and collaborative technologies on the desktop, for instance, has opened the possibility of recording online meetings for later review. Yet, despite the fact that mobile technology could enable convenient access to recorded meetings, research on interfaces for visualisation and access to meeting recordings on portable devices is currently very scarce. This chapter discusses issues on design, implementation, and evaluation of such interfaces. The discussion is illustrated with a case study and lessons learned from work on the HANMER (Hand-held Meeting Browser) system.
Key Terms in this Chapter
Space-Based Media (or Static Media): A class of media for which space is the main structuring element. Data conveyed through space-based media are generally of a permanent and serial nature. Examples include: text and static graphics.
Hand-Held Meeting Browser: A system for browsing meeting recordings on small mobile devices.
Content Mapping: A function that establishes relations between space- and time-based media. Only temporal mapping is used in this chapter. A temporal text-to-audio mapping relates each text segment to a set of speech segments.
Multimedia Meeting Recording: A digital recording of a meeting consisting minimally of a time-based data stream, typically speech, and a space-based data stream, typically text.
Temporal Neighbourhood: A set of temporal relations between space- and time-based media. In this chapter, specifically, a set of co-occurrence relations between text and speech.
Non-Linear Browsing: A modality of browsing which consists of following neighbourhood links between different media, such as text and audio, rather than playing back the meeting sequentially.
Meeting Browsing: The activity of visualising multimedia meeting recordings and finding information of interest in such recordings.
Time-Based Media (or Continuous Media): A class of media for which time is the main structuring element. Data conveyed through time-based media are generally of a transient and parallel nature. Examples include: audio and video.