Some signs can undergo phonological changes while they are articulated or when they undergo morphological changes for linguistic and/or economic reasons, e.g. ease of articulation and/or perception. Phonological processes can be of synchronic and diachronic nature.
The focus of this chapter is the former one. The phonological changes observed in the signs can affect four levels: the phonemic level, the syllabic level, level of prosodic word, and the level of higher prosodic units.