RT: #English — Articulatory Phonetics - Pronunciation

Language is one of the most complex and intriguing intellectual phenomena on earth. We engage in liguistic activity on a daily basis, however, few of us stop to comtemplate exactly what it is we are doing. --Mila Dimitrova Vulchanova - NTNU

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The field of articulatory phonetics is a subfield of phonetics. In studying articulation, phoneticians explain how humans produce speech sounds via the interaction of different physiological structures.

Generally, articulatory phonetics is concerned with the transformation of aerodynamic energy into acoustic energy. Aerodynamic energy refers to the airflow through the vocal tract. Its potential form is air pressure; its kinetic form is the actual dynamic airflow. Acoustic energy is variation in the air pressure that can be represented as sound waves, which are then perceived by the human auditory system as sound.

The two classes of sounds

Sounds of all languages fall under two categories: Consonants and Vowels.

Consonants

All consonants may be classified as either voiced or voiceless. In articulating a voiced consonant, the vocal cords are vibrating. (The vibration may easily be felt by gripping the larynx--the "Adam's apple"--between the fingers and the thumb while articulating the consonant.) In articulating an unvoiced consonant, the vocal cords are not vibrating.

Present-Day English has several consonant pairs that are articulated alike except that one is voiced and the other is unvoiced. Some examples are the phoneme spelled b in bat (voiced) and the phoneme spelled p in pat (unvoiced); the phoneme spelled d in dab (voiced) and the phoneme spelled t in tab (unvoiced); the phoneme spelled th in this (voiced) and the phoneme spelled th in thistle (unvoiced).

Consonants may also be classified according to the manner of articulation and the point of articulation: that is, how and where the flow of air is stopped or impeded when the consonant is articulated. Thus, we get the following systems of classification.

Place of articulation

One of the differences between consonants and vowels is that when we articulate vowels, the airstream flows out freely along the middle of the tongue. When we articulate consonants on the other hand, we make some kind of obstruction in the speech organs, which prevents the air from flowing out freely. These obstructions may be made with for example some part of the tongue touching or approaching the roof of the mouth, or with thelips touching each other or the upper teeth, or by making an obstruction between the vocal chords. The parts of the speech organs which are involved in articulating consonants (tip of the tongue, lips, palate, teeth, vocal chords etc.) are called articulators.

Bilabial consonants

Labiodental consonants