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#2 Phonetics
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Transcript of #2 Phonetics
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Phonetics
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Phonetics
•Phonetics studies speech sounds, including the production of speech, that is how speech sounds are actually made, transmitted and received, the description and classification of speech sounds, words and connected speech, etc.
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• We can approach it on various levels.
• At one level, speech is a matter of anatomy and physiology. We can study organs such as tongue and larynx and their functions in the production of speech.
• At another level, we can focus on the speech sounds produced by these organs by identifying and classifying the individual sounds. This is the domain of articulatory phonetics.
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Spot in English• Some letters represent more than one different sound
c: recall vs. receive gear vs. siege
• Some letters represent no sounds at all
receive use
• Sometimes two letters represent just one sound
recall phonetics
• Some letters represent two or more sounds at once
tax use
• The same sound can be represented by many different letters
sh: shy, mission, machine, special, caution
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• To describe speech sounds, it is necessary to know what an individual sound is, and how each sound differs from all others. This is not as easy as it may seem, for when we speak, the sounds seem to run together and it isn’t at all obvious where one sound ends and the next begins.
• However, when we know the language we hear the individual sounds in our “mind’s ear” and are able to make sense of them, unlike the sign painter in the cartoon.
• A speaker of English knows that there are three sounds in the word bus. Yet, physically the word is just one continuous sound.
• You can segment that one sound into parts because you know English. And you recognize those parts when they occur elsewhere as b does in bet or rob, as u does in up, and as s does in sister.
• It is not possible to segment the sound of someone clearing her throat into a sequence of discrete units. This is not because throat-clearing is one continuous sound. It is because such sounds are not speech and are therefore not able to be segmented into the sounds of speech.
• Speakers of English can separate keepout into the two words keep and out because they know the language. We do not generally pause between words (except to take a breath), even though we may think we do.
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• Read the following pairs aloud and see why we might misinterpret what we hear:
• grade A - gray day • I scream - ice cream• The sun’s rays meet - The sons raise meat• The lack of breaks between spoken words and individual sounds often
makes us think that speakers of foreign languages run their words together, unaware that we do too.
• X-ray motion pictures of someone speaking make the absence of breaks very clear.
• One can see the tongue, jaw, and lips in continuous motion as the individual sounds are produced.
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THE ORGANS OF SPEECH AND THEIR FUNCTIONS
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Besides a brain (and the knowledge of the language), what do you need
to use the spoken language?
These are the speech organs
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Stages involved in Speaking: Organs involved
Breathing stage
Phonation stage
Resonation stage
Articulation stage
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BREATHING STAGE
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Breathing, which is primarily concerned with maintaining life, is secondarily a force assisting in vocalization.
It consists of two phases --- inhalation and exhalation.Examples: _______________
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LUNGS• Serve as the reservoir of
air• As you inhale, fill the
lungs comfortably in preparation for speaking.
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Diaphragm• A large sheet of
muscle separating the chest cavity from the abdomen
• Forms the floor of the chest and the roof of the abdomen
• Gives pressure to the breath stream
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PHONATION STAGE
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Phonation takes place when voice is produced in speaking as the expiratory air stream from the lungs goes up through the trachea or windpipe to the larynx.
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Larynx• Principal organ of
phonation• Found at the top of
the trachea• Protuberance is
known as the “Adam’s apple”
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Vocal Cords•A pair of bundles of muscles and cartilages
•Open and close at various degrees
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Trachea•Also known as windpipe
•Passageway of air going up from the lungs
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RESONATION STAGE
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The voice produced in phonation is weak. It becomes strong and rich only when amplified and modified by the human resonators. Resonation is the process of voice amplification and modification.
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Pharynx• Common passageway
for air and food• Located behind the
nose and mouth and includes the cavity at the back of the tongue
• Divisions of the pharynx:
• Nasal pharynx• Oral pharynx• Laryngeal pharynx
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Nose• Consists of the external and
internal portions• Nostrils – openings of the
external nose• Nasal cavity – internal nose;
directly behind the external nose through which the air passes on its way to the pharynx
• Septum – divides the external and internal nose into two separate passageways
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Mouth• Divided into the vestibule
and the oral cavity proper• Vestibule – felt by placing
the tongue tip outside the teeth but inside the lips
• Oral cavity – felt by retracting the tongue, closing the jaws and moving the tongue about
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Resonators:Upper part of the larynx
pharynx
Nasal cavity
Oral cavity
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ARTICULATION STAGE
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Articulation occurs when the tone produced in the larynx is changed into specific sounds. This is the result of the movement of the articulators towards the points of articulation.
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Lips•Highly flexible •Can be moved into numerous positions essential to articulation
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Teeth•Serve as
important surfaces in articulation
•Embedded in the alveolar ridge or gum ridges of the oral cavity
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Dome• Also known as the
hard palate• Bony roof of the
mouth• Serves as an
important surface against which the tongue makes contact
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Uvula•Small nub on the
lower border of the soft palate
•Movable tip at the midline of the free border of the soft palate
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Velum• Also known as the
soft palate• Separates the nasal
pharynx from the oral cavity
• A flexible curtain attached along the rear border of the hard palate
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Tongue• Flexible organ consisting
of muscles, glands and connective tissues
• Parts of the tongue:• Apex or tip• Blade
• Front• Center• Back• root
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articulatorsLower
jaw
Lower lip
TongueVelum
Uvula
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Points of articulation
Upper lip
Upper teeth
Upper alveolar
ridge
Hard palate
Soft palate
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Consonants vs. Vowels
• consonantal sounds: obstruction of airflow in vocal tract• vowel sounds: little to no obstruction of airflow
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Features of Consonants and Vowels
• Voicing (state of the glottis)• Place of articulation• Manner of articulation
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Airstream Mechanisms
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• Airstream process:• The ways in which the lung (or the closed glottis, even the tongue) pushes air out or sucks it
in during speech.• Egressive sounds: air is pushed out.• Ingreessive sounds: air is sucked in.
• Phonation process:• The actions of the vocal folds.
• Articulatory process:• The movements of the tongue and the lips interacting with the roof of the mouth and the
pharynx.• Including the oro-nasal process.
Speech production mechanism
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Airstream Mechanisms
• 3 Airstream Mechanisms: • Lung airflow (pulmonic airflow mechanism)• Glottalic airflow• Velaric airflow
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Airstream Mechanisms
Pulmonic Airstream Mechanism • air is pushed out of the lungs by downward movement of rib cage and/or
upward movement of diaphragm
Plosives• stops made with an egressive pulmonic airstream • these are stops, e.g. [p, t, k]
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Airstream Mechanisms
Two Types of Glottalic Airstream Mechanism• Glottalic Egressive Airstream• Glottalic Ingressive Airstream
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Airstream Mechanisms Glottalic• we can move different bodies of air • move a closed glottis up, you’ll push air out of the
mouth • move closed glottis down, air will be sucked into
the mouth
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Airstream Mechanisms
• Glottalic Egressive Airstream• glottis acts as a kind of piston • compressing air in the pharynx • compressed air released when tongue body is lowered, i.e. when stop
is released• Glottalic egressive sound [k’]• These sounds are also called EJECTIVES• Hausa and Lakota are just two languages with ejectives.
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Airstream Mechanisms
• Glottalic Ingressive Sounds• glottis moves downward • sucking air inwards • but the glottis is not completely closed • some pulmonic air is still being pushed out • keeping the vocal cords vibrating• Bilabial implosive• Glottalic ingressive stops are also called IMPLOSIVES• Sindhi is an example of a language with implosives
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Airstream mechanism• Gllotic Egressive Mechanism
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Airstream mechanism• Gllotic Ingressive Mechanism
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Airstream mechanism
• Vellaric• Air flow is directed inwards from the oral• cavity • Pressure reduced by forming vellaric andalveolar closure and pulling down tongue
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Airstream Mechanisms
Velaric Airstream Mechanism• this is the mechanism used to make clicks!! • they involve trapping a body of air rarefying it (adding a pinch of salt
for taste) and then releasing it, resulting in a click
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Airstream mechanism
• Velaric Mechanism
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• All sounds are made with some movements of air• The basic source of power is the lungs• The air goes up the windpipe (trachea) and into the larynx and out
of the body through the vocal tract (i.e. mouth or nose)
Airstream mechanism
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Vocal folds• Their outer edges are attached to muscle
in the larynx while their inner edges are free.
• If the back end of the vocal folds are held apart, a triangular space opens up between them.
• The space is called glottis.
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Anatomy of the larynx
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Modes of Phonation
• Phonation: larynx function as a source • Larynx function:
• (1) generate airstream• (2) serve as an articulator
• Phonation modes are categories in which laryngeal muscles manipulate the folds
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Voicing/phonation
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Modes of Phonation
•Five phonation modes:• Voiceless: vocal folds far apart• Whisper:
• vocal folds adducted (closed) • opening between arytenod cartilage• air forced
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Modes of Phonation
• Breathy:• incomplete close of glottalic cycle • Muscle of arytenoids remain apart
• Voice:• Vibration of vocal folds
• Creak:• Low frequency vibration of vocal folds• Folds open briefly• Vibration is irregular from cycle to cycle
Glottal stop • Combinatory Phonation Modes:
• Breathy + Creaky • creak accompanied by breathy leakage
• Animated visual