Imt at 07:34, 29 June 2006

2006-06-29T07:34:27Z

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The LECTRA corpus has been recorded by GAEL (Gabinete de Apoio à Criação de Conteúdos Multimédia e e-Learning, IST).

Two very different courses have been selected for our pilot study: one
entitled "Economic Theory I" (ETI) and another one entitled "Production of
Multimedia Contents" (PMC). The ETI course (17 classes) and the first 6
classes of the PMC course were recorded with a lapel microphone. The last part
of the PMC course (14 classes) was recorded with a head-mounted microphone.

The two recording types presented specific problems. The lapel microphone
proved inadequate for this type of recordings given the very high frequency of
head turning of the teacher (towards the screen or the white board) that
caused very audible intensity fluctuations. The use of the head-mounted
microphone clearly improved the audio quality. However, 11% of the recordings
were saturated, due to the increase of the recording sound level during the
students' questions, in the segments that were recorded right after them.

The classes had variable duration, ranging from 40 to 90 minutes. Both professors were male speakers, with Lisbon accent. Segments from
students were not transcribed, as most were not intelligible enough, due to
the distance to the microphone.

The manual transcription of this pilot corpus is in progress, using the Transcriber tool. Currently, 5 classes from each course have been transcribed.

LECTRA Corpus - Revision history

Imt at 07:34, 29 June 2006