The Rules Behind Roles: Identifying Speaker Role in Radio Broadcasts

Regina Barzilay, Columbia University; Michael Collins, Julia Hirschberg, and Steve Wittaker, AT&T Labs -- Research

Previous work has shown that providing information about story structure is critical for browsing audio broadcasts. We investigate the hypothesis that Speaker Role is an important cue to story structure. We implement an algorithm that classifies story segments into three Speaker Roles based on several content and duration features. The algorithm correctly classifies about 80\% of segments (compared with a baseline frequency of 36\%) when applied to ASR derived transcriptions of broadcast data.

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