Understanding how webcasts are used as sources of information

Audio recordings are usually treated as one unbreakable and sequential document. Most interfaces only support basic audio navigation controls such as play, pause, forward, and rewind. However, by extracting meaningful information from audio, such as the spoken words and acoustic noise, we have created a Treemap-based interface which makes the task of finding the important information in audio simple. When applied to lecture audio, our interface allows students to easily consume lecture recordings by only listening to the parts they are interested in. A user study shows that our interface can successfully help users to find content in lecture recordings.

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“…al. [6] also used the task taxonomy for their experiments regarding retrieval in lecture recordings. In addition, Besser et.…”

Section: Audio Retrieval Requirementsmentioning

confidence: 99%

Treemaps to visualise and navigate speech audio

Abdulhamid

Marshall

2013

Proceedings of the 25th Australian Computer-Human Interaction Conference: Augmentation, Application, Innovation, Collaboration

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“…navigating to a specific slide or chapter inside a lecture recording). This behavior has been observed, for instance, on studies about reuse of webcasts and video lectures [Dufour et al, 2011]. Browsing is also a key information seeking behavior in the post-production stage: producers may need to browse through all captured content, in order to review, document and structure the most important fragments that will compose the final product.…”

Section: Multimedia Browsingmentioning

confidence: 89%

“…Aside these difficulties, the utility of interaction events as cues for representing key moments of a recording has been positively assessed by several user studies in different small group configurations, such as meetings [Nathan et al, 2012;Popescu-Belis et al, 2012] and webcasts [Dufour et al, 2011]. These results demonstrate that focusing on the semantics of the interactions between participants of a captured experience can be a feasible alternative to document the experience itself.…”

Section: Context and Motivationmentioning

confidence: 99%

Models and operators for extension of active multimedia documents via annotations

Martins¹

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Primarily, I acknowledge my advisor, Prof. Maria da Graça C. Pimentel, for the continuous support and guidance during the development of this dissertation. Thanks for helping me make this dissertation possible. I also thank CNPq for financing my research. Thanks to the evaluation committee for the important insights that contributed to improve the final version of this text. Thanks to research colleagues that have collaborated, directly or indirectly, to the discussions and experiments that lead to this research: Didier Vega-Oliveros, Lílian Oliveira e Diogo Pedrosa. I extend acknowledgements to the researchers from the SEN-5 group at CWI, who, during my internship with them, have contributed in important ways to my research: Pablo Cesar, Rodrigo Guimarães, Jack Jansen e Dick Bulterman. Finally, I thank my family for the support through this journey. First, my mother, Arlete, for standing up for me along my entire academic career and believing in my choices. My grandmother, Seide, whose early support in my education made it possible that I reached this milestone. In addition, Mario Liziér, for the understanding, support, and encouragement whenever I needed.

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“…al. [29]; and a user study to evaluate the developed visualisation. The detailed goals and objectives are listed below:…”

Section: Goals and Objectivesmentioning

confidence: 99%

“…Dufour et al [29] modified the task taxonomy for their user study. Instead of determining which audio recording is most relevant, the Relevance Judgements task was modified to rank audio recordings from most to least relevant.…”

Section: Requirements Of Spexmentioning

confidence: 99%

SpEx: A Tool for Visualising and Navigating Speech Audio

Abdulhamid¹

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<p>Audio is a ubiquitous form of information that is usually treated as a single, unbreakable, piece of content. Thus, audio interfaces remain simple, usually consisting of play, pause, forward, and rewind controls. Spoken audio can contain useful information across multiple topics and finding the information desired is usually time consuming. Most audio players simply do not reveal the content of the audio. By using the speech transcript and acoustic qualities of the audio, I have developed a tool, SpEx, which enabled search and navigation within spoken audio. SpEx displayed audio as discrete segments and revealed the topic content of each segment using mature Information Visualisation techniques. Audio segments were produced based on the acoustic and sentence properties of speech to identify topically and aurally distinct regions. A user study found that SpEx allowed users to find information in spoken audio quickly and reliably. By making spoken audio more accessible, people can gain access to a wider range of information.</p>

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Understanding how webcasts are used as sources of information

Cited by 6 publications

References 44 publications

Treemaps to visualise and navigate speech audio

Treemaps to visualise and navigate speech audio

Models and operators for extension of active multimedia documents via annotations

SpEx: A Tool for Visualising and Navigating Speech Audio

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