Method and apparatus for detecting query-driven topical events using textual phrases on foils as indication of topic
First Claim
1. A method for automatically detecting and retrieving topical events from a recording that comprises digital audio signals, comprising:
- searching for a length in the recording during which a desired topic of discussion is heard, wherein the desired topic of discussion is identified and summarized by a group of text phrases on a slide;
detecting a query-driven topical event using time-localized textual phrases on foils as an indication of a topic; and
wherein detecting the query-driven topical event further comprises detecting topical audio events using a text content of the slide as the indication of the topic.
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Abstract
A method and apparatus for detecting query-driven audio events in digital recordings focus on the detection of specific types of events, namely topical events, that occur in classroom or lecture environments, where it may be understood that topical events are defined as points in a recording where a topic is discussed. The method focuses on the problem of time-localized event detection, and identifies topical events. It enables browsing of long recordings by their topical content, making it valuable for semantic browsing of recordings. Specifically, the method of detecting topical audio events uses the text content of slides as indications of topic, and takes a query-driven approach where it is tacitly assumed that the desired topical event can be suitably abstracted in the topical phrases used on foils. The method identifies a duration in a recording during which a desired topic of discussion was heard, wherein the desired topic of discussion is identified and summarized by a group of text phrases on a slide. The method also admits text phrases arising from other data forms such as text script or textbook, and hardcopy foils, though a preferred embodiment is for the case of topical phrases listed on electronic slides.
128 Citations
42 Claims
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1. A method for automatically detecting and retrieving topical events from a recording that comprises digital audio signals, comprising:
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searching for a length in the recording during which a desired topic of discussion is heard, wherein the desired topic of discussion is identified and summarized by a group of text phrases on a slide;
detecting a query-driven topical event using time-localized textual phrases on foils as an indication of a topic; and
wherein detecting the query-driven topical event further comprises detecting topical audio events using a text content of the slide as the indication of the topic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A computer program product having instruction codes for automatically detecting and retrieving topical events from a recording that comprises digital audio signals, comprising:
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a first set of instruction codes for searching for a length in the recording during which a desired topic of discussion is heard, wherein the desired topic of discussion is identified and summarized by a group of text phrases on a slide;
a second set of instruction codes for detecting a query-driven topical event using time-localized textual phrases on foils as an indication of a topic; and
a third set of instruction codes for detecting topical audio events using a text content of the slide as the indication of the topic. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A system for automatically detecting and retrieving topical events from a recording that comprises digital audio signals, comprising:
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means for searching for a length in the recording during which a desired topic of discussion is heard, wherein the desired topic of discussion is identified and summarized by a group of text phrases on a slide;
means for detecting a query-driven topical event using time-localized textual phrases on foils as an indication of a topic; and
means for detecting topical audio events using a text content of the slide as the indication of the topic. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A system for automatically detecting and retrieving topical events from a recording that includes digital audio signals, comprising:
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a search engine that searches for a length in the recording during which a desired topic of discussion is heard, wherein the desired topic of discussion is identified and summarized by a group of text phrases on a slide;
a detector that detects a query-driven topical event in the length, using time-localized textual phrases on foils as an indication of a topic; and
a topical audio event detector that uses a text content of slides as indications of the topic. - View Dependent Claims (38, 39, 40, 41, 42)
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Specification