6.1 Phonetic & Phonological Analysis: Can you explain the types of air-streams as used in the production of human speech sounds?

Chapter 6

6.1 Explain the three main types of airstreams as used in the production of human speech sounds

Analyses of Initiation

6.1 Descriptive elements

These are elements of initiation, phonation, articulation (temporal, prosodic, metrical

organization)

 

6.2. Classification of sounds segments by Initiation

This classification is based on the

– Airstream mechanisms and airflow direction.

– The nature of mechanisms that is responsible for setting the air stream in

motion.

 

6.3 Air stream mechanisms

(Speech sounds) Production of speech sounds involves the utilization of a flow of air that

is commonly referred to as an air stream. The air stream is provided or initiated by the

action of some organs of speech. The air stream is the basis of the whole of the sound of

human speech. The initiator sets in motion air stream and thus the initiator is the most

important part of an air stream mechanism. The air stream could be used as ingressive –

to pull in air or as egressive – to push out air.

 

 Types of airstreams

Three main types of airstreams are used in the production of human speech sounds.

Each has a different initiator.

 

a) Pulmonic(egressive)

The initiators consist of the lungs and the respiratory muscles. The respiratory muscles

move the walls of the lungs, which then form the initiator. In using the egressive

pulmonic air stream mechanism expiration must become an active process and it must

utilize muscular control. This airstreams is the basis of almost all human speech sounds.

Only the egressive pulmonic airstream is used in the articulation of human speech

sounds. Some languages in special circumstances use the ingressive pulmonic airstream

but not phonetically. For instance, in English the initial sound in the word ‘yes’ utilizes

the ingressive airstream when one is speaking in an off hand manner.

 

b) Glottalic air stream mechanism

A closed glottis initiates the glottalic airstream. The glottis is the opening between the

vocal cords. The air utilized in this airstream is in the pharynx and above the larynx. The

larynx has muscles that enable it to be pushed up and down in the throat. When it moves

this way and the glottis is closed the movement pushes air out or in within the passage.

The Glottalic airstream has both ingressive and egressive air flow.

 

i) The egressive Glottalic airstream mechanism

It is utilized in Caucasian, African, central and North American languages. The sounds

produced have a low volume because the air controlled in the glottalic mechanism is not

sufficiently large for more than a small fraction of speech to be uttered at one movement

of the initiator. The vowels produced with this mechanism are inaudible. The sounds

articulated with the egressive Glottalic airstream mechanism are known as ejectives.

Example: Voiceless bilabial ejective /p’/

 

ii) The ingressive Glottalic airstream mechanism

 c) The velaric air stream mechanism

The velaric airstream mechanism is initiated by the velum. The back part of the tongue is

lifted to make firm contact with the velum. This movement forms what is referred to as a

velic closure. The closure sets in motion only that air that is in the mouth. The airstream

is ingressive for, with the lips closed, it utilizes only the inflowing air.

The air stream is used in the production of sounds found in certain African languages, for

example, Zulu, Hottentots and Bushman. The sound segments are known as clicks

because they are articulated with a sucking movement.

 

d) The oesophageal airstream

The oesophageal airstream is physiologically considered part of the glottalic airstream

mechanism. However, it is only used by those who have undergone laryngectomy. The

air stream still sets in motion the air in the passage between the pharynx and larynx.

Unlike other airstreams, users of this airstream have to practice using it after undergoing

the operation. It is, therefore, not one of the natural airstream mechanisms.

 

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