An Overview of Technical Progress in Speech Recognition

This paper presents a brief survey on Speech Recognition and discusses the major themes and advances made in the past few years of research, so as to provide a technological perspective and an appreciation of the fundamental progress that has been accomplished in this important area of speech communication. After years of research and development the accuracy of automatic speech recognition remains one of the important research challenges (e.g. variations of the context, speakers, and environment).The design of Speech Recognition system requires careful attentions to the following issues: Definition of various types of speech classes, speech representation, feature extraction techniques, speech classifiers, and database and performance evaluation. The problems that are existing in SR and the various techniques to solve these problems constructed by various research workers have been presented in a chronological order. The objective of this review paper is to summarize and compare some of the well known methods used in various stages of speech recognition system.