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In phonetics, voice onset time (VOT) is a feature of the production of stop consonants. It is defined as the length of time that passes between the release of a stop consonant and the onset of voicing , the vibration of the vocal folds , or, according to other authors, periodicity.
(See voice onset time.) Aspiration varies with place of articulation. The Spanish voiceless stops /p t k/ have voice onset times (VOTs) of about 5, 10, and 30 milliseconds, and English aspirated /p t k/ have VOTs of about 60, 70, and 80 ms. Voice onset time in Korean has been measured at 20, 25, and 50 ms for /p t k/ and 90, 95, and 125 for ...
If one analyzes the sound spectrogram of [ba] and [pa], for example, [p] and [b] can be visualized as lying somewhere on an acoustic continuum based on their VOT (voice onset time). It is possible to construct a continuum of some intermediate tokens lying between the [p] and [b] endpoints by gradually decreasing the voice onset time.
For example, one of the most studied cues in speech is voice onset time or VOT. VOT is a primary cue signaling the difference between voiced and voiceless plosives, such as "b" and "p". Other cues differentiate sounds that are produced at different places of articulation or manners of articulation. The speech system must also combine these cues ...
There are two variables to degrees of voicing: intensity (discussed under phonation), and duration (discussed under voice onset time). When a sound is described as "half voiced" or "partially voiced", it is not always clear whether that means that the voicing is weak (low intensity) or if the voicing occurs during only part of the sound (short ...
For the pairs of English stops, however, the distinction is better specified as voice onset time rather than simply voice: In initial position, /b d g/ are only partially voiced (voicing begins during the hold of the consonant), and /p t k/ are aspirated (voicing begins only well after its release).
These conventions may be convenient for representing various voice onset times. Phonation diacritics may also be prefixed or suffixed to represent relative timing beyond the segment (pre- and post-voicing etc.). The following are examples; in principle, any IPA or extIPA diacritic may be parenthesized or displaced in this manner. [3]
Voiceless stops are unaspirated and with a very short voice onset time. [1] They may be lightly voiced in rapid speech, especially when intervocalic. [3] /t/ 's exact place of articulation ranges from alveolar to denti-alveolar, to dental. [4] It may be fricated [θ̠ ~ θ] in rapid speech, and very rarely, in function words, it is deleted.