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Naming
Speech motor recognition (or silent speech recognition, articulation reading) means recognizing phonemes/words/sentences from artiuclatory movement data (usually includinng tongue and lip data). It does not mean the speech recognition (from acoustics) with the asistance of articulatory modeling (called audio-visual speech recognition or articulatory speech recognition). The challenges of slient speech reading lie in the complexity of human speech production mechanism, for example, many-to-one mapping between articulatory configurations and speech, co-articulation, and high degree of variation of articulatory movements within and acorss talkers.
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