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The concept of voice onset time can be traced back as far as the 19th century, when Adjarian (1899: 119) [1] studied the Armenian stops, and characterized them by "the relation that exists between two moments: the one when the consonant bursts when the air is released out of the mouth, or explosion, and the one when the larynx starts vibrating".
English voiceless stops are generally aspirated at the beginning of a stressed syllable, and in the same context, their voiced counterparts are voiced only partway through. In more narrow phonetic transcription , the voiced symbols are maybe used only to represent the presence of articulatory voicing, and aspiration is represented with a ...
This excludes all natural classes of sounds besides voiceless stops. For instance, it excludes voiceless fricatives, which have the feature [+continuant], voiced stops, which have the feature [+voice], and liquids and vowels, which have the features [+continuant] and [+voice]. Voiceless stops also have other, redundant, features, such as ...
If the "plain voiced stops" were not voiced, the "voiced aspirated stops" were the only voiced stops. The second constraint can accordingly be reformulated as: two nonglottalic stops must agree in voicing. Since the glottalic stops were outside the voiced/voiceless opposition, they were immune from the constraint on voicing agreement in (2).
Owere Igbo has a seven-way contrast among bilabial stops, /pʰ p ƥ bʱ b ɓ m/, and its alveolar stops are similar. The voiceless velar implosive occurs marginally in Uspantek [17] and /ʠ/ occurs in Mam, Kaqchikel, and Uspantek. [18] Lendu has been claimed to have voiceless /ƥ ƭ ƈ/, but they may actually be creaky-voiced implosives. [9]
In some contexts and in some languages, they are easy to mistake for tenuis or even voiced stops. [2] These weakly ejective articulations are sometimes called intermediates in older American linguistic literature and are notated with different phonetic symbols: C! = strongly ejective, Cʼ = weakly ejective.
All languages in the world have occlusives [2] and most have at least the voiceless stops [p], [t], [k] and the nasals [n], and [m].However, there are exceptions. Colloquial Samoan lacks the coronals [t] and [n], and several North American languages, such as the northern Iroquoian languages, lack the labials [p] and [m].
The alveolar and dental ejective stops are types of consonantal sounds, usually described as voiceless, that are pronounced with a glottalic egressive airstream. In the International Phonetic Alphabet , ejectives are indicated with a "modifier letter apostrophe" ʼ , [ 1 ] as in this article.