sound in 'tooth' and in 'teeth' appears very different because of the vocalic context. This coarticulation affects lip-reading 'beyond the viseme'.

Speech interpretation

While visemes offer a useful starting point for understanding lipreading, spoken distinctions within a viseme can be distinguished and can help support identification.Moreover, the statistical distribution of phonemes within the lexicon of a language is uneven. While there are clusters of

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