Phonetics (from the Greek ???? (phonê) "sound" or "voice") is the study of the physical sounds of human speech. It is concerned with the physical properties of speech sounds (phones), and the processes of their physiological production, auditory reception, and neurophysiological perception.
forensic phonetics is the use of phonetics (the science of speech) for forensic (legal) purposes.
Phonetics and phonology
In contrast to phonetics, phonology is the study of language-specific systems and patterns of sound and gesture. While phonology is grounded in phonetics, it is a distinct area of linguistics, dealing with abstract but psychologically-real sound and gesture units (phonemes) and their variants (allophones), the distinctive properties (features) which form the basis of meaningful contrast between these units, and their classification into natural classes based on shared behavior and phonological processes. Phonetics deals with the physical properties of sounds themselves, not how they are meaningful. There are over a hundred phones recognized as basic by the International Phonetic Association (IPA) and transcribed by simple letters in their International Phonetic Alphabet.
Although "meaningful contrast" between phonemes forms the basis of other discussions of meaning, the subject of semantics does not enter into this level of linguistic analysis.
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