Automatic Speech Recognition: From the Beginning to the Portuguese Language

Abstract. This tutorial presents an overview of automatic speech recognition systems. First, a mathematical formulation and related aspects are described. Then, some background on speech production/perception is presented. An historical review of the efforts in developing automatic recognition systems is presented. The main algorithms of each component of a speech recognizer and current techniques for improving speech recognition performance are explained. The current development of speech recognizers for Portuguese and English languages is discussed. Some campaigns to evaluate and assess speech recognition systems are described. Finally, this tutorial concludes by discussing some research trends in automatic speech recognition