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In phonetics, aspiration is the strong burst of breath that accompanies either the release or, in the case of preaspiration, the closure of some obstruents.In English, aspirated consonants are allophones in complementary distribution with their unaspirated counterparts, but in some other languages, notably most South Asian languages and East Asian languages, the difference is contrastive.
English distinguishes two types of stops: voiceless and voiced. Voiceless stops have three main pronunciations : moderately aspirated at the beginning of a word before a vowel, unaspirated after /s/, and unaspirated, unreleased, glottalized, or debuccalized at the end of a word. English voiced stops are often only partially voiced.
English has fortis consonants, such as the p in pat, with a corresponding lenis consonant, such as the b in bat. Fortis and lenis consonants may be distinguished by tenseness or other characteristics, such as voicing , aspiration , glottalization , velarization , length , and length of nearby vowels.
Observing that the traditional voiced aspirated series is preserved in languages like Sanskrit not as true voiced aspirates but as voiced consonants with breathy or murmured voice, Clackson suggests the contrast between voiceless, voiced and voiced aspirates could be reframed as stops conditioned by three phonations: voiceless, creaky or stiff ...
In the context of the Indo-Aryan languages like Sanskrit and Hindi and comparative Indo-European studies, breathy consonants are often called voiced aspirated, as in the Hindi and Sanskrit stops normally denoted bh, dh, ḍh, jh, and gh and the reconstructed Proto-Indo-European phonemes bʰ,dʰ,ǵʰ,gʰ,gʷʰ.
Direct evidence for glottalization is limited, but there is some indirect evidence, including Winter's law in Balto-Slavic as well as the parallel development of voiceless consonants and voiced aspirated consonants in Germanic: both became fricatives and glottalized (plain voiced in the earlier theory) consonants remained stops.
For example, the English suffix -s is pronounced [s] when it follows a voiceless phoneme (cats), and [z] when it follows a voiced phoneme (dogs). [1] This type of assimilation is called progressive, where the second consonant assimilates to the first; regressive assimilation goes in the opposite direction, as can be seen in have to [hæftə].
The voiceless glottal fricative, sometimes called voiceless glottal transition or the aspirate, [1] [2] is a type of sound used in some spoken languages that patterns like a fricative or approximant consonant phonologically, but often lacks the usual phonetic characteristics of a consonant.