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This paper presents a brief survey on Automatic Speech Recognition and discusses the major themes and advances made in the past 60 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 (eg., 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, database and performance evaluation.
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