Sounds of English: Plosives & Stops

Plosives – a plosive is a consonant characterized by a complete obstruction of the outgoing airstream by the articulators, a build up of air pressure in the mouth, and finally a release of that pressure.  A stop is merely the first part of this sound (the stopping of the airstream).  In other words, in producing these sounds, the air is stopped for a brief moment (say pop over and over and pay attention to what’s happening).  There are three types of plosive in English.  For an interactive example of each sound (including descriptive animation and video), click this link, then in the window that opens, click stops, and select the appropriate sound.

/p/  /b/ bilabial plosives

A bilabial (from bi- two and labia lip) plosive is a sound in which the flow of air out of the body is interrupted by closing the lips together. English has two bilabial plosives — /p/ in which the vocal chords are not used (voiceless) as in pizza and pepper, and /b/ in which they are used as in boy and trouble.

/t/  /d/ lingua-alveolar plosives

A lingua-alveolar (from lingua tongue and alveola the ridge just behind the front upper teeth) plosive is a sound in which the flow of air out of the body is interrupted by touching the tongue to the alveolar ridge — the part of the roof of the mouth, just behind the upper front teeth. English has two lingua-alveolar plosives — voiceless /t/ as in top and must, and /d/ which is voiced as in dog and troubled.

/k/  /g/ lingua-velar plosives

A lingua-velar (from lingua tongue and velar the velum or soft palate) plosive is a sound in which the flow of air out of the body is interrupted by touching the back of the tongue to the velum — the soft part of the roof of the mouth farthest from the front teeth; it’s about as far back in the mouth as can be reached with the tip of the tongue.  English has two lingua-velar plosives — voiceless /k/ as in cook and ask, and /g/ which is voiced as in dog and good.

Aspiration – aspiration refers to the release of air at the end of a consonant sound.  Plosives are naturally aspirated (because air is released following the stop portion of the sound.  Linguists often use the term aspiration only to refer to strong puffs of voiceless air after a plosive.  Sometimes the term “aspirated stop” is employed, but this is a misnomer as stops cannot be aspirated (aspirated stops thus being plosives).  Regardless of aspiration though, the procedures for producing sounds are the same, thus ‘aspirated /p/ is not annotated differently from non-aspirated /p/.

Continue reading Part 3.2: Fricatives

Sounds of English: Fricatives

Fricatives – a fricative is a consonant produced by forcing air through a constricted space.  In other words, in producing these sounds, turbulence is caused when the air is forced trough a smaller opening.  Depending on which parts of the vocal tract are used to constrict the airflow, that turbulence causes the sound produced to have a specific character (say have very slowly and stretch out the /v/; pay attention to what happens to the air when the teeth touch the bottom lip for the /v/).  There are five types of fricative in English.  For an interactive example of each sound (including descriptive animation and video), click this link, then in the window that opens, click fricative, and select the appropriate sound.

/f/  /v/ labiodental fricatives

A labiodental (from labia lip and dental teeth) fricative is a sound in which the flow of air out of the body is constricted by upper teeth to the lower lip, creating turbulence for the air, but not stopping its passage out of the mouth. English has two labiodental fricatives – /f/ in which the vocal chords are not used (voiceless) as in fire and laughter, and /v/ in which they are used as in very and of.

/θ/  /ð/ linguadental fricatives

A linguadental (from lingua tongue and dental teeth) fricative is a sound in which the flow of air out of the body is constricted by touching the tongue to the bottom edge of the front upper teeth, creating a narrow opening through which the air passes. English has two linguadental fricatives — voiceless /θ/ as in think and math, and /ð/ which is voiced as in this and father.

/s/  /z/ lingua-alveolar fricatives

A lingua-alveolar (from lingua tongue and alveola the ridge just behind the front upper teeth) fricative is a sound in which the flow of air out of the body is constricted by touching the tongue to the alveolar ridge — the part of the roof of the mouth, just behind the upper front teeth, creating a narrow opening through which the air passes. English has two lingua-alveolar fricatives — voiceless /s/ as in say and class, and /z/ which is voiced as in zebra and is.

/∫/  /ʒ/  lingua-palatal fricatives

A lingua-palatal (from lingua tongue and palate the top of the mouth) fricative is a sound in which the flow of air out of the body is constricted by touching the tongue to the hard palate — the part of the roof of the mouth, just behind the alveolar ridge (see above), creating a narrow opening through which the air passes. English has two lingua-palatal fricatives — voiceless /∫/ as in shoe, pressure, and machine, and /ʒ/ which is voiced as in azure, pleasure, and rouge.

/h/  /ɦ/ glottal fricatives

A glottal (from glottis the area of the windpipe behind the tongue) fricative is a sound in which the flow of air out of the body is constricted by tightening the glottis — the part of the windpipe behind (below) the tongue which contains the vocal cords, creating a narrow opening through which the air passes before entering the mouth. English has two types of glottal fricative — voiceless /h/ as in happy and hello, and /ɦ/ which actually represent an entire class of voiced glottal fricatives — vowels (more on this here).

Continue reading Part 3.3: Affricates

Sounds of English: Affricates

Affricates – an affricate is a consonant which begins as a stop (plosive), characterized by a complete obstruction of the outgoing airstream by the articulators, a build up of air pressure in the mouth, and finally releases as a fricative, a sound produced by forcing air through a constricted space, which produces turbulence when the air is forced trough a smaller opening.  Depending on which parts of the vocal tract are used to constrict the airflow, that turbulence causes the sound produced to have a specific character (compare pita with pizza, the only difference is the release in /t/ and /ts/).  There are two types of affricate in English.  For an interactive example of each sound (including descriptive animation and video), click this link, then in the window that opens, click affricate, and select the appropriate sound.

/ts/  /dz/ lingua-alveolar affricates

A lingua-alveolar (from lingua tongue and alveola the ridge just behind the front upper teeth) affricate is a sound which the flow of air out of the body is initially interrupted in the same manner as a lingua-alveolar stop /t/ or /d/, then immediately released in the same manner as a lingua-alveolar fricative /s/ or /z/,  constricted by touching the tongue to the alveolar ridge — the part of the roof of the mouth, just behind the upper front teeth, creating a narrow opening through which the air passes. English has two lingua-alveolar affricates — voiceless /ts/ as in pizza and its, and /dz/ which is voiced as in ads and adze.

/t∫/  /dʒ/  postalveolar affricates

A postalveolar (from post- after and alveola the ridge just behind the front upper teeth) affricate is a sound which is a combination of a lingua-alveolar stop /t/ or /d/ and a lingua-palatal fricative /∫/ or /ʒ/.  Because a postalveolar afficate is a combination of two sounds with different points of articulation (in this case, the spot where the tip of the tongue contacts the top of the mouth), its point of articulation falls between that of its two component sounds.  In a lingua-alveolar stop, the tongue interrupts the flow of air by pressing against the alveolar ridge — the part of the roof of the mouth, just behind the upper front teeth. In a lingua-palatal fricative, the flow of air out of the body is constricted by very nearly touching the tongue to the hard palate — the part of the roof of the mouth, just behind the alveolar ridge, creating a narrow opening through which the air passes.  In a postalveolar affricate, the point of articulation for both the stop and fricative release occurs between these two positions, just behind the alveolar ridge but not quite on the hard palate.  English has two postalveolar affricates — voiceless /t∫/ as in cheese, catch, and ligature, and /dʒ/ which is voiced as in judge, magic, and jam.

Continue reading Part 3.4: Nasals, Liquids, & Glides

Points of Articulation

A team at the University of Iowa developed this (now abandoned) very useful website a few years ago.  It’s an interactive flash site with both audio and visual animation showing the process for speech production.  It’s excellent for showing language learners points of articulation, or if you are linguist struggling with IPA or slight differences between languages, this is also a great reference.

Universal Points of Articulation:  anatomy.htm

Language-Specific Points of Articulation (English, German, Spanish):  http://www.uiowa.edu/~acadtech/phonetics/#