In linguistics, a surface filter is a type of sound change that operates not at a particular point in time but over a longer period. Surface filters normally affect any phonetic combination that is not permitted according to the language's phonetic rules and so preserve the phonotactics of that language.
In linguistics, a surface filter is a type of sound change that operates not at a particular point in time but over a longer period. Surface filters normally affect any phonetic combination that is not permitted according to the language's phonetic rules and so preserve the phonotactics of that language.
Source: Wikipedia "Surface filter" · CC BY-SA 4.0
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