The document discusses vocal resonance and the cavities involved in vocal resonance production. It describes the mouth, pharyngeal, and nasal cavities as the main resonators. The mouth cavity can be modified through positions of the lips, tongue, jaw, and soft palate. The pharyngeal cavity extends from the larynx to the soft palate and can change shape through movements of the tongue, soft palate, and larynx. The nasal cavity is also an important resonator that can be included or excluded through lowering or raising of the soft palate.

1. RESONATORS
(CAVITIES)

2. RESONANCE: Definition
• Crystal (2003:397) defines Resonance as follows:
• “A term derived from the physics of sound, and used
in ACOUSTIC PHONETICS to refer to those vibrations
of air movement in the VOCAL TRACT which are set in
motion (resonate) by a source of PHONATION. The
main resonance chamber of the vocal tract are the
mouth , nose, and PHARYNX , and these CAVITIES, in
their various shapes, act to strengthen some of the
FREQUENCIES present in the source of sound
(O’Connor,1973:83), producing the range of human
sounds.”
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3. RESONANCE : Types
• There are two basic kinds of resonance:
sympathetic resonance (or free resonance) and
conductive resonance (or forced resonance). The
essential difference between both types is what
causes the resonator to start vibrating. In
sympathetic resonance there is no physical
contact between the two bodies. The resonator
starts functioning because it receives vibrations
through the air and responds to them
sympathetically. In conductive resonance the
resonator starts vibrating because it is in
physical contact with a vibrating body
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4. Vocal Resonation
• Vocal resonation is the process by which the
basic product of phonation is enhanced in
timber and /or intensity by the air-filled
cavities through which it passes on its way to
the outside air. Different terms related to
resonation are used, including: amplification.
enrichment, enlargement, improvement, inte
nsification , and prolongation.
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5. Airstream
• The airstream, having
passed through the
larynx, is now subject to
further modification
according to the shape
assumed by the upper
cavities of the pharynx
and mouth, and
according to whether
the nasal cavities are
brought into use or not.
These cavities function
as the principal
resonators of the voice
produced in the larynx.
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6. PHARYNGEAL CAVITY
• The pharynx is the most important
resonator by virtue of its
position, size, and degree of
adjustability. It is the first cavity of any
size through which the product of the
laryngeal vibrator passes; the other
supraglottal cavities have to accept
whatever the pharynx passes on to
them.
• The pharyngeal cavity extends from
the top of the trachea and
oesophagus, past the epiglottis and
the root of the tongue, to the region
at the rear of the soft palate. It is
convenient to identify these sections
of the pharynx by naming them:
• laryngopharynx,
• oropharynx, and
• nasopharynx.
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7. PHARYNGEAL CAVITY:Modification
The shape and volume of this long chamber
may be considerably modified
• by the constrictive action of the muscles
enclosing the pharynx,
• by the movement of the back of the tongue,
• by the position of the soft palate which
may, when raised, exclude the
nasopharynx, and
• by the raising of the larynx itself.
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8. PHARYNGEAL CAVITY: Tongue Position
• The position of the tongue in the mouth, whether it is
advanced or retracted, will affect the size of the
oropharyngeal cavity; the modifications in shape of
this cavity should, therefore, be included in the
description of any vowel. It is a characteristic of some
kinds of English pronunciation that certain vowels e.g.
the /æ/ vowel in sad are articulated with a strong
pharyngeal contraction; in addition, a constriction
may be made between the lower rear part of the
tongue and the wall of the pharynx so that
friction, with or without voice, is produced, such
fricative sounds being a feature of a number of
languages.
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9. PHARYNGEAL CAVITY: ESCAPE OF AIR
• The escape of air from the pharynx may be
affected in one of three ways(Ogden,2009:10ff) :
(1) The soft palate may be lowered, as in normal
breathing, in which case the air may escape
through the nose and the mouth. This is the
position taken up by the soft palate in
articulation of the French nasalized vowels in a
phrase such as un bon vin blanc, the particular
quality of such vowels being achieved through
the function of the nasopharyngeal cavities.
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10. PHARYNGEAL CAVITY: ESCAPE OF AIR
(2) The soft palate may be lowered so that a nasal
outlet is afforded to the airstream, but a
complete obstruction is made at some point in
the mouth, with the result that, although air
enters all or part of the mouth cavity, no oral
escape is possible. A purely nasal escape of this
sort occurs in nasal consonants such as *m, n, ŋ+
in the English words ram, ran, rang.
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11. PHARYNGEAL CAVITY: ESCAPE OF AIR
(3) The soft palate may be held in its raised
position, eliminating the action of the
nasopharynx, so that the air escape is solely
through the mouth. All normal English
sounds, with the exception of the nasal
consonants mentioned, have this oral escape.
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12. PHARYNGEAL CAVITY: ESCAPE OF AIR
• If for any reason the lowering of the soft palate cannot be
effected, or if there is an enlargement of the organs enclosing the
nasopharynx or a blockage brought about by mucus, it is often
difficult to articulate either nasalized vowels or nasal consonants.
In such speech, typical of adenoidal enlargement or the
obstruction caused by a cold, the French phrase mentioned above
would have its nasalized vowels turned into their oral equivalents
• An inability to make an effective closure by means of the raising of
the soft palate – either because the soft palate itself is defective
or because an abnormal opening in the roof of the mouth gives
access to the nasal cavities – will result in the general nasalization
of vowels and the failure to articulate oral stop consonants such
as [b,d,g]. This excessive nasalization (or hypernasality) is typical
of a condition such as cleft palate.
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13. MOUTH CAVITY
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14. MOUTH CAVITY : The Shape of the
Mouth
• It is true that the shape of the mouth determines the quality of the majority of
human speech sounds. Far more finely controlled variations of shape are possible
in the mouth than in any other part of the speech mechanism.
• The only boundaries of this oral chamber which may be regarded as relatively
fixed are, in the front, the teeth; in the upper part, the hard palate; and, in the
rear, the pharyngeal wall. The remaining organs are movable: the lips, the
various parts of the tongue, and the soft palate with its pendant uvula.
• The lower jaw, too, is capable of very considerable movement; its movement will
control the gap between the upper and lower teeth and also to a large extent the
disposition of the lips.
• The space between the upper and lower teeth will often enter into the
description of the articulation of sounds; in all such cases, it is clear that the
movement of the lower jaw is ultimately responsible for the variation described.
Movement of the lower jaw is also one way of altering the distance between the
tongue and the roof of the mouth.
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15. MOUTH CAVITY: The Roof of the
Mouth
• It is convenient to divide the roof of the
mouth into three parts: moving backwards
from the upper teeth, first, the alveolar ridge
which can be clearly felt behind the teeth;
MOUTH CAVITY
secondly, the bony arch which forms the hard
palate, which varies in size and arching from
one individual to another; and finally, the
soft palate is capable of being raised or
lowered, and at the extremity of which is the
uvula (see Ladefoged,2006:8f).
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16. MOUTH CAVITY: The Lips
• The lips constitute the final orifice of the mouth
cavity whenever the nasal passage is shut off. The
shape which they assume will, therefore, affect very
considerably the shape of the total cavity. They may
be shut or held apart in various ways. When they are
held tightly shut, they form a complete obstruction or
occlusion to the airstream, which may either be
momentarily prevented from escaping at all, as in the
initial sounds of pat and bat, or may be directed
through the nose by the lowering of the soft
palate, as in the initial sound of mat. If the lips are
held apart, the positions they assume may be
summarized under five headings.
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17. MOUTH CAVITY: The Lips
• 1- Held sufficiently close together over all their length that friction occurs
between them. Fricative sounds of this sort, with or without voice, occur
in many languages and the voiced variety [B] is sometimes wrongly used
by foreign speakers of English for the first sound in the words vet or wet;
• 2- Held sufficiently far apart for no friction to be heard, yet remaining
fairly close together and energetically spread. This shape is taken up for
vowels like that in see and is known as the SPREAD lip position;
• 3- Held in a relaxed position with a lowering of the lower jaw. This is the
position taken up for the vowel of sat and is known as the NEUTRAL
position;
• 4- Tightly pursed, so that the aperture is small and rounded, as in the
vowel of do, or more markedly so in the French vowel of doux. This is the
CLOSE ROUNDED position; and
• 5- Held wide apart, but with slight projection and rounding, as in the
vowel of got. This is the OPEN ROUNDED position.
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18. MOUTH CAVITY: The Tongue
• The tongue is by far the most flexible and is capable of assuming a great
variety of positions in the articulation of both vowels and consonants.
The tongue is a complex muscular structure which does not show
obvious sections; yet, since its position must often be described in
considerable detail, certain arbitrary divisions are made. When the
tongue is at rest, with its tip lying behind the lower teeth, that part
which lies opposite the hard palate is called the FRONT and that which
faces the soft palate is called the BACK, with the region where the front
and back meet known as the CENTRE. These areas, together with the
root, are sometimes collectively referred to as the body of the tongue.
The tapering section facing the teeth ridge is called the blade and its
extremity the tip. The edges of the tongue are known as the rims.
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19. In the articulation of vowels, the tongue tip remains low behind
the lower teeth. The body of the tongue may, however, be
‘bunched up’ in different ways, e.g. the front may be the highest
part as when we say the vowel of he; or the back may be most
prominent as in the case of the vowel in who; or the whole
surface may be relatively low and flat as in the case of the vowel
in ah. Such changes of shape can be felt if the above words are
said in succession (Ogden,2009:56). These changes
moreover, together with the variations in lip position, have the
effect of modifying very considerably the size of the mouth cavity
and of dividing this chamber into two parts:
1- that cavity which is in the forward part of the mouth behind the
lips and
2- that which is in the rear in the region of the pharynx.
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20. NASAL CAVITY
• The nasal cavity is the third most effective
resonator. The sinuses are extremely
important to voice modulation.
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