Voice or voicing is a term used in phonetics and phonology to characterize speech sounds (usually consonants). Speech sounds can be described as either voiceless (otherwise known as unvoiced) or voiced.
The term, however, is used to refer to two separate concepts:
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A vowel is a speech sound pronounced without any stricture in the vocal tract. Vowels are one of the two principal classes of speech sounds, the other being the consonant. Vowels vary in quality, loudness, and length. They are usually voiced and are closely involved in prosodic variation such as tone, intonation and stress. The nucleus, or "center", of a syllable typically consists of a vowel sound (though this is not always the case).
The word vowel comes from the Latin word vocalis, meaning "vocal" (i.e. relating to the voice). In English, the word vowel is commonly used to refer both to vowel sounds and to the written symbols that represent them: ⟨a⟩, ⟨e⟩, ⟨i⟩, ⟨o⟩, ⟨u⟩, and sometimes ⟨y⟩, and ⟨w⟩.
In linguistics, voicelessness is the property of sounds being pronounced without the larynx vibrating. Phonologically, it is a type of phonation, which contrasts with other states of the larynx, but some object that the word phonation implies voicing and that voicelessness is the lack of phonation.
The International Phonetic Alphabet (IPA) has distinct letters for many voiceless and modally voiced pairs of consonants (the obstruents), such as [p b], [t d], [k ɡ], [q ɢ], [c ɟ], [f v], and [s z]. Also, there are diacritics for voicelessness, U+0325 ◌̥ COMBINING RING BELOW and U+030A ◌̊ COMBINING RING ABOVE, which is used for letters with a descender. Diacritics are typically used with letters for prototypically voiced sounds, such as vowels and sonorant consonants: [ḁ], [l̥], [ŋ̊].In Russian use of the IPA, the voicing diacritic may be turned for voicelessness, e.g. ⟨ṋ⟩.
The term phonation has slightly different meanings depending on the subfield of phonetics. Among some phoneticians, phonation is the process by which the vocal folds produce certain sounds through quasi-periodic vibration. This is the definition used among those who study laryngeal anatomy and physiology and speech production in general. Phoneticians in other subfields, such as linguistic phonetics, call this process voicing, and use the term phonation to refer to any oscillatory state of any part of the larynx that modifies the airstream, of which voicing is just one example. Voiceless and supra-glottal phonations are included under this definition.
Ancient Greek phonology is the reconstructed phonology or pronunciation of Ancient Greek. This article mostly deals with the pronunciation of the standard Attic dialect of the fifth century BC, used by Plato and other Classical Greek writers, and touches on other dialects spoken at the same time or earlier. The pronunciation of Ancient Greek is not known from direct observation, but determined from other types of evidence. Some details regarding the pronunciation of Attic Greek and other Ancient Greek dialects are unknown, but it is generally agreed that Attic Greek had certain features not present in English or Modern Greek, such as a three-way distinction between voiced, voiceless, and aspirated stops (such as /b p pʰ/, as in English "bot, spot, pot"); a distinction between single and double consonants and short and long vowels in most positions in a word; and a word accent that involved pitch.
Koine Greek, the variety of Greek used after the conquests of Alexander the Great in the fourth century BC, is sometimes included in Ancient Greek, but its pronunciation is described in Koine Greek phonology. For disagreements with the reconstruction given here, see below.
Xiang or Hsiang (Chinese: 湘; Changsha Xiang: [sian˧ y˦˩], Mandarin: [ɕi̯aŋ˥ y˨˩˦]), also known as Hunanese, is a group of linguistically similar and historically related Sinitic languages, spoken mainly in Hunan province but also in northern Guangxi and parts of neighboring Guizhou, Guangdong, Sichuan, Jiangxi and Hubei provinces. Scholars divided Xiang into five subgroups: Lou–Shao (Old Xiang), Chang–Yi (New Xiang), Chen–Xu or Ji–Xu, Hengzhou, and Yong–Quan. Among those, Lou–Shao, or Old Xiang, still exhibits the three-way distinction of Middle Chinese obstruents, preserving the voiced stops, fricatives, and affricates. Xiang has also been heavily influenced by Mandarin, which adjoins three of the four sides of the Xiang-speaking territory, and Gan in Jiangxi Province, from where a large population immigrated to Hunan during the Ming dynasty.
Xiang-speaking Hunanese people have played an important role in Modern Chinese history, especially in those reformatory and revolutionary movements such as the Self-Strengthening Movement, Hundred Days' Reform, Xinhai Revolution and Chinese Communist Revolution. Some examples of Xiang speakers are Mao Zedong, Zuo Zongtang, Huang Xing and Ma Ying-jeou.
In linguistics, a distinctive feature is the most basic unit of phonological structure that distinguishes one sound from another within a language. For example, the feature [+voice] distinguishes the two bilabial plosives: [p] and [b] (i.e., it makes the two plosives distinct from one another). There are many different ways of defining and arranging features into feature systems: some deal with only one language while others are developed to apply to all languages.
Distinctive features are grouped into categories according to the natural classes of segments they describe: major class features, laryngeal features, manner features, and place features. These feature categories in turn are further specified on the basis of the phonetic properties of the segments in question.