Since the sixties, movies such as “2001: A Space Odyssey” have familiarized us with the idea of com-puters that can speak and hear just as a human being does. Automatic speech recogni-tion (ASR) is the technol-ogy that allows machines to interpret human speech (i.e. to answer the ques-tion: What is being said?). The machine ”speaks back“, either by playing pre-recorded messages or by using text-to-speech (TTS) technology.
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