| Manners of articulation |
| Obstruent |
| Click |
| Plosive |
| Ejective |
| Implosive |
| Affricate |
| Fricative |
| Sibilant |
| Sonorant |
| Nasal |
| Flap/Tap |
| Trill |
| Approximant |
| Liquid |
| Vowel |
| Semivowel |
| Lateral |
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Note: This page contains
IPA phonetic symbols
in Unicode.
In Phonetics, a vowel is a Sound in spoken Language that is characterized by an open configuration of the Vocal tract where there is no build-up of air pressure above the Glottis. This contrasts with consonants, which are characterized by a constriction or closure at one or more points along the vocal tract. The additional requirement is that vowels function as syllabic units: it is this criterion that distinguishes vowels from semivowels (and approximants, which in some languages may be slightly more constricted).
In most languages, vowels usually form the nucleus or peak of a Syllable, whereas consonants form the onset and coda. However, some languages allow sounds that wouldn't normally be classified as vowels to form the nucleus of a syllable, such as the sound of l in the English word table (the final e is not pronounced), or the sound of r in the Czech word vrba (meaning "willow"). The non-vowel sounds that may function as syllable nuclei are called sonorants. (In some languages, such as Tashlhyt Berber and Oowekyala, non-sonorant consonants can also form the nucleus of a syllable.)
The word vowel comes from the Latin word vocalis, meaning "uttering voice" or "speaking".
It may be possible that some varieties of German have 5 contrasting heights. Otherwise, the usual limit on the number of vowel heights is 4.
The parameter of vowel height appears to be the most primary feature of vowels cross-linguistically in that all languages use height constrastively. The other possible parameters, such as backness and roundedness (explained below), are not used in all languages.
The highest number of constrastive degrees of backness is 3.
Nonetheless, even in languages such as German and Vietnamese, there is usually some correlation between rounding and backness: Front rounded vowels tend to be less front than front unrounded vowels, and back unrounded vowels tend to be less back than back rounded vowels. That is, the placement of unrounded vowels to the left of rounded vowels on the IPA vowel chart is reflective of their typical position.
Different kinds of labialization are also possible. The Japanese /u/, for example, is not rounded like English /u/, where the lips are protruded (or pursed), but neither are the lips spread to the sides as they are for unrounded vowels. Rather, they are compressed in both directions, leaving a slot between the lips for the air to escape. (See Vowel roundedness for illustrations.) Swedish is one of the few languages where this feature is contrastive, have both protruded-lip and compressed-lip high front vowels. In many treatments, both are considered a type of rounding, and are often called endolabial rounding (pursed, where the insides of the lips approach each other) and exolabial rounding (compressed, where the margins of the lips approach each other). However, other phoneticians do not believe that these are subsets of a single phenomenon of rounding, and prefer instead the three independent terms rounded, compressed, and spread (for unrounded).
Modal voice, Creaky voice, and Breathy voice (murmured vowels) are Phonation types that are used contrastively in some languages. Often, these co-occur with tone or stress distinctions; in the Mon language, vowels pronounced in the high tone are also produced with creaky voice. In cases like this, it can be unclear whether it is the tone, the voicing type, or the pairing of the two that is being used for phonemic contrast. This combination of phonetic cues (i.e. phonation, tone, stress) is known as register or register complex.
A stronger degree of pharyngealisation occur in the Northeast Caucasian languages and the Khoisan languages. These might be called epiglottalized, since the primary constriction is at the tip of the epiglottis.
The greatest degree of pharyngealisation is found in the strident vowels of the Khoisan languages, where the Larynx is raised, and the pharynx constricted, so that either the epiglottis or the arytenoid cartilages vibrate instead of the vocal chords.
Note that the terms pharyngealized, epiglottalized, strident, and sphincteric are sometimes used interchangeably.
Unlike the other features of vowel quality, tenseness is only applicable to the few languages that have this opposition (mainly Germanic languages, e.g. English), whereas the vowels of the other languages (e.g. Spanish) cannot be described with respect to tenseness in any meaningful way.
In most Germanic languages, lax vowels can only occur in closed syllables. Therefore, they're also known as checked vowels, whereas the tense vowels are called free vowels since they can occur in any kind of syllable.
The acoustics of vowels are fairly well-understood. The different vowel qualities are realized in acoustic analyses of vowels by the relative values of the formants, acoustic resonances of the vocal tract which show up as dark bands on a Spectrogram. The vocal tract acts as a resonant cavity, and the position of the jaw, lips, and tongue affect the parameters of the resonant cavity, resulting in different formant values. The acoustics of vowels can be visualized using spectrograms, which display the acoustic energy at each frequency, and how this changes with time.
The first formant, abbreviated "F1", corresponds to vowel openness (vowel height). Open vowels have high F1 frequences while close vowels have low F1 frequencies, as can be seen at right: The and have similar low first formants, whereas has a higher formant.
The second formant, F2, corresponds to vowel frontness. Back vowels have low F2 frequencies while front vowels have high F2 frequencies. This is very clear at right, where the front vowel has a much higher F2 frequency than the other two vowels. However, in open vowels the high F1 frequency forces a rise in the F2 frequency as well, so a better measure of frontness is the difference between the first and second formants. For this reason, vowels are usually plotted as F1 vs. F2 - F1. This is the case for the vowel chart at the top of this page. (This dimension is usually called 'backness' rather than 'frontness', but the term 'backness' can be counterintuitive when discussing formants.)
R-colored vowels are characterized by lowered F3 values.
Rounding is generally realized by a complex relationship between F2 and F3 that tends to reinforce vowel backness. One effect of this is that back vowels are most commonly rounded while front vowels are most commonly unrounded; another is that rounded vowels tend to plot to the right of unrounded vowels in vowel charts. That is, there is a reason for plotting vowel pairs the way they are.
Intonation encompasses the changes in pitch, intensity, and speed of an Utterance over time. In tonal languages, in most cases the tone of a syllable is carried by the vowel, meaning that the relative pitch or the pitch contour that marks the tone is superimposed on the vowel. If a syllable has a high tone, for example, the pitch of the vowel will be high. If the syllable has a falling tone, then the pitch of the vowel will fall from high to low over the course of uttering the vowel.
Length or quantity refers to the abstracted duration of the vowel. In some analyses this feature is described as a feature of the vowel quality, not of the prosody. Japanese, Finnish, Hungarian, Arabic and Latin have a two-way phonemic contrast between short and long vowels. The Mixe language has a three-way contrast among short, half-long, and long vowels, and this has been reported from a few other languages, in not all of which is the distinction phonemic. Long vowels are written in the IPA with a triangular colon, which has two equilateral triangles pointing at each other in place of dots (). The IPA symbol for half-long vowels is the top half of this (). Longer vowels are sometimes claimed, but these are always divided between two syllables.
It should be noted that the length of the vowel is a grammatical abstraction, and there may be more phonologically distinctive lengths. For example, in Finnish, there are five different physical lengths, because stress is marked with length on both grammatically long and short vowels. However, Finnish stress is not lexical and is always on the first two moras, thus this variation serves to separate words from each other.
In non-tonal languages, like English, intonation encompasses lexical stress. A stressed syllable will typically be pronounced with a higher pitch, intensity, and length than unstressed syllables. For example in the word intensity, the vowel represented by the letter 'e' is stressed, so it is longer and pronounced with a higher pitch and intensity than the other vowels.
All languages have monophthongs and many languages have diphthongs, but triphthongs or vowel sounds with even more target qualities are relatively rare cross-linguistically. English has all three types: the vowel sound in hit is a monophthong , the vowel sound in boy is in most dialects a diphthong , and the vowel sounds of way , flower (BrE AmE ) form a triphthong (dissylabic in the latter cases), although the particular qualities vary by dialect.
The longest sensible word with most consecutive vowels is Finnish riiuuyöaieuutinen (courting night intention news [certainly yellow press stuff!]), syllabicated rii-uu-yö-ai-e-uu-ti-nen.
In Phonology, diphthongs and triphthongs are distinguished from sequences of monophthongs by whether or not the vowel sound may be analyzed into different phonemes or not. For example, the vowel sounds in a two-syllable pronunciation of the word flower (BrE AmE ) phonetically form a dissyllabic triphthong, but are phonologically a sequence of a diphthong (represented by the letters <ow>) and a monophthong (represented by the letters <er>). Some linguists use the terms diphthong and triphthong only in this phonemic sense.
In most languages, vowels are an unchangeable part of the words, as in English man vs. moon which are not different inflectional forms of the same word, but different words. Vowels are especially important to the structures of words in languages that have very few consonants (like Polynesian languages such as Maori and Hawaiian), and in languages whose inventory of vowels is larger than its inventory of consonants.
| i | u |
| e | o |
| a | |
This particular configuration is common because it makes the most efficient use of the vowel space, so slight variations in a vowel are not easily confused for a different sound. Spanish and Modern Greek, for example, have this vowel system; Latin had a similar system that also distinguished between long and short vowels, although that distinction wasn't made in written Latin; it is for this reason that the Latin alphabet has five vowel letters. All languages have at least two vowels; the Tshwizhyi and Abzhui dialects of Abkhaz contrasts only and , with significant allophony. (There have been proposals to posit only one vowel in some Abkhaz dialects; however, most linguists who are familiar with Abkhaz do not accept this theory.) Three-vowel systems have been noted in a number of languages. These include:
A few languages, such as Navajo, have four-vowel systems that lack /u/ but there is no known natural language that lacks some form of a. At the other end of the spectrum, languages with more than twelve vowels are relatively uncommon, although some widely-spoken languages have large vowel inventories, particularly Germanic languages. For example, English has 14–20 vowels (including diphthongs) depending on dialect, and Swedish has 17 distinct vowel qualities in the height-backness-roundedness spectrum, although these also involve a length contrast, and the long vowels have diphthongized allophones. French has 16 vowel qualities, including nasals, and the previously-mentioned Sedang has 24 distinct monophthongs, which it achieves by contrasting Phonation on seven vowel qualities. Ju/’hoan uses phonation and nasalization with five vowel qualities to achieve approximately 40 vowels, most of which may occur both long and short.
There is necessarily not a direct one-to-one correspondence between the vowel sounds of a language and the vowel letters. Many languages that use a form of the Latin alphabet have more vowel sounds than can be represented by the standard set of five vowel letters. In the case of English, the five primary vowel letters can represent both long and short vowel sounds (some of the long vowel sounds in English are actually diphthongs). Furthermore, in English some vowel sounds are represented by combinations of vowel letters, such as the ea in beat or by a vowel letter and an approximant letter, as the ow in how, or the er in her.
Other languages cope with the limitation in the number of Latin vowel letters in similar ways. Many languages, like English, make extensive use of combinations of vowel letters to represent various sounds. Other languages add diacritical marks to vowels, such as accents or umlauts, to represent the variety of possible vowel sounds. Some languages have also constructed additional vowel letters by modifying the standard Latin vowels in other ways, such as æ or ø that are found in some of the Scandinavian languages. The International Phonetic Alphabet has a set of 28 symbols to represent the range of basic vowel qualities, and a further set of diacritics to denote variations from the basic vowel.