Speech Mechanism Or
Production of speech
Language has a very important social purpose, because it is
mainly used for linguistic communication. It can be used in two ways. It can be
spoken
or written.
But the medium of speech is more important than the medium of writing.
Linguistic is a systematic study of language. Phonetics is a branch of
Linguistics and it is branch dealing with the medium of speech. It deals with
the production, transmission and reception of the sounds of human speech. Now
we discuss ‘speech Mechanism’ in a
depth.
What is Speech
Mechanism:-
For
the production of speech sounds we need an air-stream. The air that flows out
of mouth is modified speech sounds by the action of certain organs of our body.
The speech sounds don’t come automatically. For the articulation of most speech
sounds of most language, lung-air is used. This air is modified into speech
sound by the operation various speech organs which is known as ‘air stream Mechanism’ or ‘speech Mechanism.
Air stream
Mechanism:-
As
we know an air stream is the basis of speech sounds because for the production
of speech sounds, we need an air stream. This air stream is produced by an air
stream mechanism. There are three main air stream mechanisms: (1) Pulmonic
(2) Glottalic and (3) Velaric air stream mechanism.
The pulmonic air-stream mechanism: The pulmonic air-stream mechanism consists of the lung
and respiratory muscles. The walls of
lungs act as initiator. They are moved so the air is drawn into and
pushed out. When this system pushes air out, it is known as ‘egressive’. When this system is used
to draw air in, it is ‘ingressive’.
Most of the languages use a pulmonic
egressive air stream mechanism.
A pulmonic ingressive air stream is used but no language sounds are produced.
We use this air stream mechanism for yawning and snoring.
Glottalic air-stream mechanism: The
second air-stream mechanism is Glottalic air-stream mechanism. The closed
glottis acts as the initiator for this and the air in the pharynx is used. For
this reason, some linguists refer to this air-stream mechanism as pharyngeal.
Both egressive and ingressive Glottalic air-stream mechanisms are used by some
language of the world for the articulation of speech sounds. Among Indian
language, Sindhi has sounds articulated with a glottalic ingressive air-stream
mechanism.
Velaric air-stream mechanism: The third
air-stream mechanism is Velaric air-stream mechanism. The back of tongue is the initiator. Air in the mouth is yet in
the motion during this air-stream mechanism. . So it is also known as ‘oral’
air-stream mechanism. Sounds produced with a Velaric ingressive mechanism exist
in several African language; sounds produced with a Velaric egressive
air-stream mechanism do not seem to exist in any language.
The organs of speech Mechanism:-
For
the production of speech sounds, we need an air-stream mechanism and that most
sounds of most language in the world are produced with a pulmonic egressive
air-stream mechanism. The air that we breathe out comes out of the langs. Before it gets out into
the outer atmosphere, various organs in our body convert it into speech sounds.
These organs are called the organ of speech mechanism. The organs of speech can
be divided into the following three group.
The respiratory system. 2. The Phonetary system. 3. The articulatory
system.
The respiratory system:-
The
respiratory system consists of the lungs,
the muscles of the chest and the
windpipe (trachea). The lungs
are spongy bodies. They are made up small sacs called alveoli. Air is supplied
to alveoli by small tubes called the bronchioles. It is through the trachea or
windpipe that the air we breathe in passes through the throat into the
lungs. The act that is known as
respiratory involves two processes.
Inspiration-Taking
outer air into lungs.
Expiration-Throwing
out air from the lungs into the outer atmosphere.
The
lungs serve as a source of air and the source of energy for production of
speech is generally the air stream coming out of lungs.
(2) The Phonetary system:-
The
Phonetary system consists of larynx.
The larynx is the little box that is called the ‘Adam’s apple’, situated at the
top of the windpipe. The air from the lungs comes out through the windpipe and
the larynx. In the larynx, there are situated a pair of like structure called
vocal cords and these are placed horizontally from front to back. They are
attached in front and can be separated to the back. The opening between the
cords is called the glottis is called the glottis.
The vocal cards can be opened and
closed. The vibration of vocal cords is very significant in speech. When they
are kept loosely together, they vibrate and that the vibration produces a
musical not called voice. The rate of vibration is called frequency of
vibration. This decides the pitch of the voice which helps to create the intonation of a
language.
(3) The articulator system:-
The
articulatory system consists of the roof the mouth, the tongue, the teeth, the
lips.
The roof of the mouth comprises the
teeth-ride, the hard palate, the soft palate, and the uvula. The convex bony part of the roof of the mouth
which lies immediately behind the upper front teeth is called teeth-ridge.
Immediately after the teeth-ridge the roof of the mouth become concave and it
is hard and called hard palate. Immediately after the hard palate the roof of
the mouth become soft and it called soft palate. The fleshy structure hanging
loose at the extreme end of the roof of the mouth is called uvula.
The
tongue is most fleecy and is capable of amusing a great variety of position
during the articulations of the vowels and consonants. For convenience of
description, we divide tongue into four parts: the tip of tongue, the blade of
the tongue, the front of the tongue, the back of the tongue. The extreme edge
of the tongue is called the tip of tongue. Immediately after the tip is the
blade of the tongue. Beyond the blade is called the front of the tongue. Beyond
the front is the back of the tongue.
The teeth acts as passive articulation
for producing speech sound. The Lips play their part in the articulation of
certain consonant. e.g. /p/, /b/, /m/ are produced with the lips tightly shut.
Also the lips play an important part during the articulation of vowel sounds.
The lower lip act as an active articulator while the upper lip is a passive.
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