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4. Four aspects of speech sounds. Branches of phonetics based on these aspects and their connection with non-linguistic sciences.

There are four aspects of speech sounds: articulatory, physical, or acoustic, auditory and functional, or linguistic. Each aspect is studied by a certain branch of phonetics.

a) Articulatory phonetics. From the articulatory point of view every speech sound is a complex of definite, finely coordinated and differentiated movements and position of the various speech organs. All the movements and positions of the speech organs necessary to pronounce a speech sound constitute its articulation.

Articulatory phonetics is concerned with the study, description and classification of speech sounds in the framework of their articulation and in connection with the organs of speech by which they are produced. It is connected with such non-linguistic sciences as physiology and anatomy.

b) Acoustic phonetics. From the acoustic point of view a speech sound like any other sound in nature is a physical phenomenon and it is communicated to the air in the form of sound waves, which appears due to the disturbance of the air stream by the movements of the speech organs. These movements push the particles of air which are next to it and displace them. The displaced layer of particles displaces the next layer, and the pressure is transmitted through the air. Thus, the space between the air particles becomes smaller and the air is compressed or condensed. Compressed air particles reach the listener’s ear-drum and cause pressure to it. When the pressing force has spent itself, the displaced particles return to their original position because of the elasticity of air and produce rarefactions behind them – that is the space between two neighbouring particles is increased. These alternating waves of condensation and rarefaction are sound waves.

Acoustic phonetics studies all the acoustic properties of speech sounds, the way in which the air vibrates between the speaker’s mouth and the listener’s ear. It is connected with such non-linguistic science as physics.

c)Auditory phonetics. From the auditory point of view speech sounds are perceived by the listener’s hearing organs and transmitted through the nervous system to the brain as a spoken message.

So auditory phonetics investigates the hearing process, caused by brain activity, the means by which we discriminate sounds, that is pitch, tamber, loudness, length of sounds, which are correlated with the physical properties of the corresponding sound waves. It is connected with such non-linguistic sciences as physiology, anatomy and psychology.

d)Functional phonetics (phonology, phonological phonetics). From the functional point of view speech sounds are significant units of the language which perform different linguistic functions, such as constitutive, recognitive and distinctive. In contrast to the greater language units, such as morphemes, words and sentences, speech sounds have no meaning by themselves. But a morpheme or a word can only exist in the form of a speech sound or a sequence of speech sound, and any modification of a word can be effected only on the basis of speech sound.

Functional phonetics deals with linguistically relevant or phonological (functional) properties of speech sounds, the properties which are essential for the communicative process.

Recently within functional phonetics sociophonetics has been singled out. It studies the ways in which phonetic structures interact with society and change in response to different social functions.

Functional phonetics is connected with such non-linguistic sciences as sociology and statistics.

The interconnection of articulatory, acoustic, auditory and linguistic aspects of speech sounds is observed in the succession of stages in the human speech production. First, the formation of the concept takes place in the brain of the speaker. The message formed within the brain is transmitted along the nervous system to the speech organs which articulate a particular pattern of speech sounds. The materialized sound waves have certain acoustic properties by which the listener’s auditory apparatus perceives them and the nervous system sends the message to the brain, where the linguistic interpretation of the information is conveyed.

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