This corpus is composed of the audio and the manual transcriptions of the LECTRA Corpus: classroom LECture TRAnscriptions in European Portuguese. The corpus includes seven 1-semester University courses. All lectures were taught at Technical University of Lisbon (IST), recorded in the presence of students, except IICT, recorded in another university and in a quiet office environment, targeting an Internet audience. The corpus contains a total of 28 hours of audio speech that were manually transcribed by several trained annotators.

The corpus is comprised of technical University lectures: Production of Multimedia Contents (PMC), Economic Theory I (ETI), Linear Algebra (LA), Introduction to Informatics and Communication Techniques (IICT), Object Oriented Programming (OOP), Accounting (CONT), Graphical Interfaces (GI).

Two files per lecture are provided:
a) a RAW file: audio file
b) a TRS file: containing the manual transcriptions. The TRS format is a kind of XML format that a standard transcription software such as Transcriber can open. Annotations in the TRS files are at word-level. They are fine-grained transcriptions that include disfluencies. The characters in the text files are encoded in ISO-8859-1 (Latin1).

The TRS files have a total of 220K word tokens (Training set: 179K word tokens, Development set: 21K word tokens, Test set: 20K word tokens). The whole resource occupies 3.3 GB.

For a complete description of the corpus and the report of Automatic Speech Recognition results, the reader may refer to:
(Trancoso et al., 2008) Isabel Trancoso, Rui Martins, Helena Moniz, Ana Isabel Mata da Silva, Maria do Céu Guerreiro Viana Ribeiro, The LECTRA Corpus - Classroom Lecture Transcriptions in European Portuguese, In
LREC 2008 - Language Resources and Evaluation Conference, Marrakesh, Morocco, May 2008.
(Pellegrini et al., 2012) Thomas Pellegrini, Helena Moniz, Fernando Batista, Isabel Trancoso, Ramon Fernandez Astudillo, Extension of the LECTRA corpus: classroom LECture TRAnscriptions in European Portuguese, In SPEECH AND CORPORA, Belo Horizonte, March 2012.