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The difference between the unvoiced stop phonemes and the voiced stop phonemes is not just a matter of whether articulatory voicing is present or not. Rather, it includes when voicing starts (if at all), the presence of aspiration (airflow burst following the release of the closure) and the duration of the closure and aspiration.
This voicing of /f/ is a relic of Old English, at a time when the unvoiced consonants between voiced vowels were 'colored' by an allophonic voicing rule /f/ → [v]. As the language became more analytic and less inflectional, final vowels or syllables stopped being pronounced.
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 to determine the category of a specific speech sound.
The difference between /θ/ and /ð/ is normally described as a voiceless–voiced contrast, the distinction that native speakers are most aware of. They are also distinguished by other phonetic markers: the fortis /θ/ is pronounced with more muscular tension than the lenis /ð/ ; and /θ/ is more strongly aspirated than /ð/ , as can be ...
Punjabi has lost voiced aspirated consonants, which resulted in a tone system, and therefore has a distinction between voiceless, aspirated, and voiced: /p pʰ b/. Other languages such as Telugu, Malayalam, and Kannada, have a distinction between voiced and voiceless, aspirated and unaspirated.
In English, every voiced fricative corresponds to a voiceless one. 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 ...
Voiceless implosives are also rare. Clicks, which are lingual ingressive. Here the back of the tongue is used to create a vacuum in the mouth, causing air to rush in when the forward occlusion (tongue or lips) is released. Clicks may be oral or nasal, stop or affricate, central or lateral, voiced or voiceless.
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".