NCHLT Auxiliary speech data for ASR technology development in South Africa

The aim of the National Centre for Human Language Technology (NCHLT) project was to create speech and text resources that would enable Human Language Technology (HLT) development for the 11 official languages of South Africa. The speech data described in this paper was collected during the NCHLT project using a smartphone application. The official NCHLT Speech Corpus was released in 2014, but it did not include all recordings that were made during the data collection campaign. This paper describes the additional data that was recently released as auxiliary corpora [2]. The auxiliary data sets contain between 20 and 170 hours of speech data per language as well as the transcriptions associated with each utterance. In terms of the resources required for HLT development South Africa's official languages are all under-resourced. The data described in this paper contributes toward alleviating this situation, specifically for the development of speech technology.