The document discusses voice recognition systems and their key components. It describes:
1) Sphinx, an open source tool used for speech recognition that uses Hidden Markov Models and applies feature extraction, language modeling, and acoustic modeling.
2) The CMU lexical access system which hypothesizes words from a phonetic dictionary using syllable anchors.
3) Key parts of speech recognition systems including feature extraction, acoustic modeling, language modeling, and the use of HMMs to match features to models.
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