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3. General and special phonetics and their interconnection. Historical, descriptive and comparative phonetics as branches of special phonetics.

General phonetics studies all the sound-producing possibilities of the human speech organs and the ways they are used for purposes of human communication by means of language, i.e. it finds out the types of speech sounds in different languages of the world, the way they are produced and the role they play in forming and expressing thoughts; it investigates the laws governing the changes of speech sounds in the flow of speech and finds out the types of such changes in various languages it determines the nature, types and role of other phonetic means necessary to convey thoughts in various languages, such as word accent, syllabic structure and intonation. General phonetics is a part of general linguistics.

General phonetics and special phonetics are closely interconnected. On the one hand general phonetics is based on the extensive material which the special phonetics of a great number of languages provides. It is also based on the achievements data of other sciences, such as physics, biology, psychology, speech pathology etc. As a result, general phonetics has been able to analyze phonetic phenomena from different points of view and to formulate a number of important theories: the phoneme theory, the theories of syllable formation and division, theories connected with syntagm, stress, intonation, graphical rules and rules of orthography etc. On the other hand, general phonetics provides valuable theoretical material which enables us to understand clearly and to interpret correctly the different phonetic phenomena of a concrete language.

Special phonetics is concerned with the study of the phonetic structure of a particular language. It is subdivided into descriptive phonetics and historical phonetics.

Descriptive phonetics deals with the phonetic system of a particular language at a particular (mostly contemporary) period.

Historical phonetics aims at tracing and establishing the successive changes in the phonetic system of a given language at different stages of its development. It uses the philological method of investigation, which consists in studying written monuments and comparing different spellings of one and the same word. Historical phonetics is a part of the history of a language. But it is also important for the study of the modern phonetic system of a language because without a historical approach it is impossible to understand how this modern phonetic system came to be and what further changes it is likely to undergo. Historical phonetics is connected with general history, the history of the people whose language is studied and archeology.

Comparative phonetics investigates the phonetic system of two or more languages especially kindred ones, and find out the correspondences between the elements of phonetic system of these languages.

Phonetics is also divided into segmental phonetics, which is concerned with individual sounds and suprasegmental phonetics, which is concerned with the larger units of connected speech: syllables, words, phrases and texts where prosodic characteristics of speech are revealed.

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