domingo, 23 de abril de 2017

Phonemes

    Phonemes is one of the units of sound (or gesture in the case of sign languages, see chereme) that distinguish one word from another in a particular language. In most dialects of English, the difference in meaning between the words kill /kɪl/ and kiss /kɪs/ is a result of the substitution of one phoneme, /l/, for another phoneme, /s/. Two words like this that differ in meaning through a contrast of a single phoneme form what is called a minimal pair.

     In linguistics, phonemes (usually established by the use of minimal pairs, such as kill vs kiss or pat vs bat) are written between slashes like this: /p/, whereas when it is desired to show the more exact pronunciation of any sound, linguists use square brackets, for example [pʰ] (indicating an aspirated p).


    Within linguistics there are differing views as to exactly what phonemes are and how a given language should be analyzed in phonemic (or phonematic) terms. However, a phoneme is generally regarded as an abstraction of a set (or equivalence class) of speech sounds (phones) which are perceived as equivalent to each other in a given language. For example, in English, the k sounds in the words kit and skill are not identical (as described below), but they are distributional variants of a single phoneme /k/. Different speech sounds that are realizations of the same phoneme are known as allophones. Allophonic variation may be conditioned, in which case a certain phoneme is realized as a certain allophone in particular phonological environments, or it may be free in which case it may vary randomly. In this way, phonemes are often considered to constitute an abstract underlying representation for segments of words, while speech sounds make up the corresponding phonetic realization, or surface form.


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