HMM/MLP hybrid speech recognizer for the Portuguese telephone SpeechDat corpus

In this article, we describe an automatic speech recognizer developed for Portuguese telephone speech. For this, we employed the Portuguese SpeechDat database which will be described in detail, giving its recording conditions, speaker characteristics and contents categories. The automatic recognizer is a state-of-the-art HMM/MLP hybrid system employing different kinds of robust acoustic features. Training and testing was carried out on the clean digits and numbers part of the database. The recognition results show competitive performance to similar systems developed for other languages.