Coarticulation is the part of speech production that would be most affected if the vocal folds are anesthetized so that they are immobile.
When adjacent speech affects the articulation of the present speech segment (phoneme or viseme), it is referred to as coarticulation. This phenomenon occurs in the visual domain because the actions of the visual articulator are influenced by the adjacent visemes. In order to generate realistic facial animation, the dynamic characteristics and timing of the articulatory movements must be correct, hence solving this problem is essential to visual speech synthesis. The literature has recommended a variety of techniques for modelling coarticulation.
It is difficult to define the relationship between linguistic and acoustic parameters because speech does not simply consist of a sequence of sound segments that correspond to the phonemes, syllables, or words of the message. This is especially true for stop consonants, which are essentially dynamic and have no static form.
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