8th International Conference on Spoken Language Processing

Jeju Island, Korea
October 4-8, 2004

Unsupervised Topic Adaptation for Lecture Speech Retrieval

Atsushi Fujii (1), Tetsuya Ishikawa (1), Katsunobu Itou (2), Tomoyosi Akiba (1)

(1) University of Tsukuba, Japan
(2) Nagoya University, Japan

We are developing a cross-media information retrieval system, in which users can view specific segments of lecture videos by submitting text queries. To produce a text index, the audio track is extracted from a lecture video and a transcription is generated by automatic speech recognition. In this paper, to improve the quality of our retrieval system, we extensively investigate the effects of adapting acoustic and language models on speech recognition. We perform an MLLR-based method to adapt an acoustic model. To obtain a corpus for language model adaptation, we use the textbook for a target lecture to search a Web collection for the pages associated with the lecture topic. We show the effectiveness of our method by means of experiments.

Full Paper

Bibliographic reference.  Fujii, Atsushi / Ishikawa, Tetsuya / Itou, Katsunobu / Akiba, Tomoyosi (2004): "Unsupervised topic adaptation for lecture speech retrieval", In INTERSPEECH-2004, 2957-2960.