DIPHTHONGS, CONSONANTS AND VOWELS

DIPHTHONGS
are types of vowels where two vowel sounds are connected in a continuous, gliding motion. They are often referred to as gliding vowels. Most languages have a number of diphthongs, although that number varies widely, from only one or two to fifteen or more.

A vowel is a specific type of sound, characterized by a lack of full obstruction to the air flow. Vowels can be contrasted with consonants, where there is such an obstruction. As air comes out when you are speaking a consonant, there is a build up of pressure as the air flow is constricted. When speaking a vowel, there is no built up pressure, the sound is simply shaped by the position of the tongue.

Vowels are generally characterized by three different criteria: the position of the tongue in the mouth relative to the roof of the mouth (height), the position of the tongue in either the front or back of the mouth (backness), and the shape of the lips as the vowel sound is being made (roundedness). There are other things that may characterize vowels, but they are not very common in English — things such as the position of the root of the tongue, for example, rarely affect English vowels, though they affect the vowels in many African languages.

When vowels come together, they may either be two distinct syllables, or may merge into one syllable. When they merge, they form what are known as diphthongs. If they stay separate they are simply two monophthongs. An example of two single syllable vowels can be seen in the word triage, in which the i and the a are both pronounced on their own. An example of a diphthong can be seen in the word mouse, in which the ou part of the word obviously consists of two distinct vowels, but there is no syllabic break between the two.

Diphthongs can usually be seen as having two distinct parts — the nucleus, and the off-glide. The nucleus of the diphthong is the vowel that is most stressed, and forms the center of the sound, while the off-glide is the vowel which seems to flow into or off of the nucleus vowel.

The three major diphthongs in Standard English, which are known as phonemic diphthongs, are ai, aw, and oy. All three of these diphthongs are very common, and many people simply think of them as single vowels in some contexts. For example, in the English word ride, the i would be transcribed phonetically as ai. Although it appears as a single letter in our writing, it actually consists of two vowels — if you say the word you should be able to hear the two. Similarly, the word how contains the diphthong aw at the end, and the word boy contains the diphthong oy.

Other diphthongs in Standard English are the ei sound in the word fame or the pronunciation of the letter a, and the ou sound in the word phone. Other languages have many more diphthongs aside from these, and other dialects of English may have more diphthongs as well. Languages such as Finnish have nearly twenty diphthongs, while the Received Pronunciation dialect of English has an extra five or so diphthongs not found in Standard English.

In addition to diphthongs and monophthongs, there are also what are called triphthongs. These are similar to diphthongs, but instead of moving simply from one vowel sound to another, a third sound is also added. Source: What Are Diphthongs?

TYPES OF DIPHTHONGS

Falling (or descending) diphthongs start with a vowel quality of higher prominence (higher pitch or louder) and end in a semivowel with less prominence, like [aɪ̯] in "eye", while rising (or ascending) diphthongs begin with a less prominent semivowel and end with a more prominent full vowel, like [ɪ̯a] in "yard". The less prominent component in the diphthong may also be transcribed as an approximant, thus [aj] in "eye" and [ja] in "yard". However, when the diphthong is analysed as a single phoneme, both elements are often transcribed with vowel letters (/aɪ̯/, /ɪ̯a/). Note also that semivowels and approximants are not equivalent in all treatments, and in the English and Italian languages, among others, many phoneticians do not consider rising combinations to be diphthongs, but rather sequences of approximant and vowel. There are many languages (such as Romanian) that contrast one or more rising diphthongs with similar sequences of a glide and a vowel in their phonetic inventory.[3]
In closing diphthongs, the second element is more close than the first (e.g. [ai]); in opening diphthongs, more open (e.g. [ia]). Closing diphthongs tend to be falling ([ai̯]), and opening diphthongs are generally rising ([i̯a]), because open vowels are more sonorous and therefore tend to be more prominent. However, exceptions to this rule are not rare in the world's languages. In Finnish, for instance, the opening diphthongs /ie̯/ and /uo̯/ are true falling diphthongs, since they begin louder and with higher pitch and fall in prominence during the diphthong.

A centering diphthong is one that begins with a more peripheral vowel and ends with a more central one, such as [ɪə̯], [ɛə̯], and [ʊə̯] in Received Pronunciation or [iə̯] and [uə̯] in Irish. Many centering diphthongs are also opening diphthongs ([iə̯], [uə̯]).
Some languages contrast short and long diphthongs, the latter usually being described as having a long first element. Languages that contrast three quantities in diphthongs are extremely rare, but not unheard of: Northern Sami is known to contrast long, short and finally stressed diphthongs, the last of which are distinguished by a long second element.

While there are a number of similarities, diphthongs are not the same as a combination of a vowel and a semivowel or glide. Most importantly, diphthongs are contained in the syllable nucleus[4] while a semivowel or glide is restricted to the syllable boundaries (either the onset or the coda). This often manifests itself phonetically by a greater degree of constriction.[5] The English word yes, for example, consists of a palatal glide followed by a monophthong rather than a rising diphthong.



CONSONANTS

A consonant is a sound in spoken language that is characterized by a constriction or closure at one or more points along the vocal tract. The word consonant comes from Latin meaning "sounding with" or "sounding together", the idea being that consonants don't sound on their own, but only occur with a nearby vowel; this conception of consonants, however, does not reflect a modern linguistic understanding, which defines them in terms of vocal tract constrictions.
There are a group of consonants called sonorants that sometimes act as vowels, occupying the peak of a syllable, and sometimes act as consonants. For example, in English, the sound [m] in "mud" is a consonant, but in "prism", it occupies an entire syllable, as a vowel would.
The word consonant is also used to refer to letters of an alphabet that denote a consonant sound. Consonant letters in the English alphabet are B, C, D, F, G, H, J, K, L, M, N, P, Q, R, S, T, V, W, X, Z, and sometimes Y - the letter Y stands for a consonant in "yoke" but for a vowel in "myth", for example.

Since the number of consonants in all the world's languages is much greater than the number of consonant letters in most alphabets, linguists have devised systems such as the International Phonetic Alphabet (IPA) to assign a unique symbol to each possible consonant. In fact, the Latin alphabet, which is used to write English, has fewer consonant letters than English has consonant sounds, so some letters represent more than one consonant, and digraphs like "sh" and "th" are used to represent some sounds. Many speakers aren't even aware that the "th" sound in "this" is a different sound from the "th" sound in "thing."

Each consonant can be distinguished by several features:

The manner of articulation is the method that the consonant is articulated, such as nasal, stop, or approximant. The place of articulation is where in the vocal tract the articulators of the consonant act, such as bilabial, alveolar, or velar. The phonation method of a consonant is whether or not the vocal cords are vibrating during articulation of a consonant. When the vocal cords are vibrating, the consonant is voiced; when they're not, it's voiceless. Aspiration is also a feature of phonation. The airstream mechanism is how the air moves through the vocal tract during articulation. Most languages have exclusively pulmonic egressive consonants, but ejectives, clicks, and implosives use different mechanisms. All English consonants can be classified by a combination of these, such as "voiceless alveolar stop consonant" [t]. In this case, the air stream mechanics is omitted.
source: Consonant

Common consonants

Many consonants are far from universal. For instance, nearly all Australian languages lack fricatives; a large percentage of the world's languages, for example Mandarin Chinese, lack voiced stops such as [b], [d], and [g]. The most common consonants around the world are the three voiceless plosives [p], [t], [k] and the two nasals [m], [n].
Most languages, however, do include one or more fricatives, with [s] being the most common, and a liquid consonant or two, with [l] the most common. The approximant [w] is also widespread. However, even the basic five—[p], [t], [k], [m], [n]—are not universal. Several languages in the vicinity of the Sahara Desert, including Arabic, lack [p]. Several languages of North America, such as Mohawk, lack both labials, [p] and [m]. Some West African languages, such as Ijo, lack /n/ on a phonemic level, but [n] does occur as an allophone of /l/. A few languages on Bougainville Island and around Puget Sound, such as Makah, lack both nasals, [m] and [n]. The 'click language' Nǀu lacks [t],[5] and colloquial Samoan lacks both alveolars, [t] and [n].[6] Xavante has no dorsal consonants whatsoever. However, nearly all other languages have at least one velar consonant: the few languages which do not have a simple [k] have a consonant that is very similar.[7] For instance, an areal feature of the Pacific Northwest coast is that historical *k has become palatalized in many languages, so that Saanich for example has [tʃ] and [kʷ] but no plain [k].[8][9]

The most frequent consonant (that is, the one appearing most often in speech) in many languages is [k].
"CONSONANTS" are sounds made by severly restricting or stopping the flow of air. Note that is not JUST those that stop the flow -- these sounds (like b,p, t,d, k,g), fittingly called "STOPS" [another useful term] are only ONE type of consonant. A great many consonants do not stop the flow, but they DO restrict it.VOWEL eother hand, are characterized by how they SHAPE the sound --esp by positioning of the tongue and shape of the mouth-- WITHOUT severely constricting the air flow. This is why they are so important to carrying speech and enabling us to open up our mouths and sing. Note that vowels almost always are "voiced" (sounded with the vocal chords); in many (most?) languages (English included) ALL vowels are voiced. A great many consonants --including those that don't stop the air flow-- are not voiced. This characteristic use of the voice (compare "vocal") is the origin of the term "vowel" itself. The vowels in English are a,e,i,o,u. Other than these, all the other alphabets are consonants.

In articulatory phonetics, a consonant is a speech sound that is articulated with complete or partial closure of the upper vocal tract, the upper vocal tract being defined as that part of the vocal tract that lies above the larynx. Consonants contrast with vowels.
Since the number of consonants in the world's languages is much greater than the number of consonant letters in any one alphabet, linguists have devised systems such as the International Phonetic Alphabet (IPA) to assign a unique symbol to each attested consonant. In fact, the Latin alphabet, which is used to write English, has fewer consonant letters than English has consonant sounds, so digraphs like "ch", "sh", "th", and "zh" are used to extend the alphabet, and some letters and digraphs represent more than one consonant. For example, many speakers are not aware that the sound spelled "th" in "this" is a different consonant than the "th" sound in "thing". (In the IPA they are transcribed ð and θ, respectively.)


VOWELS

A vowel is a type of sound for which there is no closure of the throat or mouth at any point where vocalization occurs. Vowels can be contrasted with consonants, which are sounds for which there are one or more points where air is stopped. In nearly all languages, words must contain at least one vowel. While a word can be formed without any consonants – such as the English words I or way – no word may consist of only consonants, without a vowel.
Vowels in many languages are not crucial to the general meaning of the word. Rather, a vowel in these languages – of which many are Semitic languages – acts more to give a specific inflection than to differentiate the word from other distinct words. A parallel of this in English can be seen in the example of dive and dove or lay and lie, in which the core word is the same, but the changed vowel denotes tense. Languages that have this type of structure often do not even mark all of their vowels in written text. Both Arabic and Hebrew are good examples of this, where the marking of many vowels is unnecessary in writing.

Since a vowel refers to a specific type of sound, orthographically some letters may represent a consonant in some circumstances, and a vowel in others. In English we can see this with the letters y and w which are most often used to make consonant sounds, but can also be used to represent vowels. In the case of y, for example, we can compare its use in the words yonder and day. In the word yonder, it acts distinctly as a consonant, with the center of the tongue blocking the flow of air on one side by touching the palette of the mouth – as what is called a palatal approximant. In the word day, on the other hand, it is forming a vowel sound akin to if the word were written in English as dei.

In the case of w, we could look at the words woo and how. In the word woo, the letter is acting as a consonant, with the back of the tongue blocking the flow of air on one side by touching the palette of the mouth – what is called a labiovelar approximant. In the word how, it serves as a vowel, which could be represented in English writing as hao.

In English, there are five letters which always represent a vowel when written: a, e, i, o, and u. These five letters represent more than five vowel sounds, however, depending on the word, or if they are combined with other vowels. Compare the letter a in the words hat and hate as one of many examples. source: What is a vowel?

In phonetics, a vowel is a sound in spoken language, such as English ah! [ɑː] or oh! [oʊ], pronounced with an open vocal tract so that there is no build-up of air pressure at any point above the glottis. This contrasts with consonants, such as English sh! [ʃː], where there is a constriction or closure at some point along the vocal tract. A vowel is also understood to be syllabic: an equivalent open but non-syllabic sound is called a semivowel.
In all languages, vowels form the nucleus or peak of syllables, whereas consonants form the onset and (in languages which have them) coda. However, some languages also allow other sounds to form the nucleus of a syllable, such as the syllabic l in the English word table [ˈteɪ.bl̩] (the stroke under the l indicates that it is syllabic; the dot separates syllables), or the r in Serbian vrt [vr̩t] "garden".

We might note the conflict between the phonetic definition of 'vowel' (a sound produced with no constriction in the vocal tract) and the phonological definition (a sound that forms the peak of a syllable).[1] The approximants [j] and [w] illustrate this conflict: both are produced without much of a constriction in the vocal tract (so phonetically they seem to be vowel-like), but they occur on the edge of syllables, such as at the beginning of the English words 'yes' and 'wet' (which suggests that phonologically they are consonants). The American linguist Kenneth Pike suggested the terms 'vocoid' for a phonetic vowel and 'vowel' for a phonological vowel,[2] so using this terminology, [j] and [w] are classified as vocoids but not vowels.
The word vowel comes from the Latin word vocalis, meaning "speaking", because in most languages words and thus speech are not possible without vowels. Vowel is commonly used to mean both vowel sounds and the written symbols that represent them.

Articulation

The articulatory features that distinguish different vowel sounds are said to determine the vowel's quality. Daniel Jones developed the cardinal vowel system to describe vowels in terms of the common features height (vertical dimension), backness (horizontal dimension) and roundedness (lip position). These three parameters are indicated in the schematic IPA vowel diagram on the right. There are however still more possible features of vowel quality, such as the velum position (nasality), type of vocal fold vibration (phonation), and tongue root position.

Consonants and vowels

Consonants and vowels correspond to distinct parts of a syllable: The most sonorous part of the syllable (that is, the part that's easiest to sing), called the syllabic peak or nucleus, is typically a vowel, while the less sonorous margins (called the onset and coda) are typically consonants. Such syllables may be abbreviated CV, V, and CVC, where C stands for consonant and V stands for vowel. This can be argued to be the only pattern found in most of the world's languages, and perhaps the primary pattern in all of them. However, the distinction between consonant and vowel is not always clear cut: there are syllabic consonants and non-syllabic vowels in many of the world's languages.

One blurry area is in segments variously called semivowels, semiconsonants, or glides. On the one side, there are vowel-like segments which are not in themselves syllabic, but which form diphthongs as part of the syllable nucleus, as the i in English boil [ˈbɔɪ̯l]. On the other, there are approximants which behave like consonants in forming onsets, but are articulated very much like vowels, as the y in English yes [ˈjɛs]. Some phonologists model these as both being the vowel /i/, so that the English word bit would phonemically be /bit/, beet would be /bii̯t/, and yield would be phonemically /i̯ii̯ld/. Similarly, foot would be /fut/, food would be /fuu̯d/, wood would be /u̯ud/, and wooed would be /u̯uu̯d/. However, there is a (perhaps allophonic) difference in articulation between these segments, with the [j] in [ˈjɛs] yes and [ˈjiʲld] yield and the [w] of [ˈwuʷd] wooed having more constriction and a more definite place of articulation than the [ɪ] in [ˈbɔɪ̯l] boil or [ˈbɪt] bit or the [ʊ] of [ˈfʊt].

The other problematic area is that of syllabic consonants, that is, segments which are articulated as consonants but which occupy the nucleus of a syllable. This may be the case for words such as church in rhotic dialects of English, although phoneticians differ in whether they consider this to be a syllabic consonant, /ˈtʃɹ̩tʃ/, or a rhotic vowel, /ˈtʃɝtʃ/: Some distinguish an approximant /ɹ/ that corresponds to a vowel /ɝ/, for rural as /ˈɹɝl/ or [ˈɹʷɝːl̩]; others see these as the a single phoneme, /ˈɹɹ̩l/.

Other languages utilize fricative and often trilled segments as syllabic nuclei, as in Czech and several languages in Congo and China, including Mandarin Chinese. In Mandarin, they are historically allophones of /i/, and spelled that way in Pinyin. Ladefoged and Maddieson[4] call these "fricative vowels" and say that "they can usually be thought of as syllabic fricatives that are allophones of vowels." That is, phonetically they are consonants, but phonemically they behave as vowels.
Many Slavic languages allow the trill [r̩] and the lateral [l̩] as syllabic nuclei (see Words without vowels), and in languages like Nuxalk, it is difficult to know what the nucleus of a syllable is (it may be that not all syllables have nuclei), though if the concept of 'syllable' applies, there are syllabic consonants in words like /sx̩s/ 'seal fat'.