A distinctive phonetic feature separates alveolo-palatal consonants from palatal consonants
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Peer-reviewed phonetic literature supports that articulatory classification data distinguish alveolopalatal and palatal consonants into separate classes.
Linguopalatal and sagittal vocal tract configuration data from a large number of languages reveal that the so-called palatal consonants (i.e. [ç ʎ c ɲ j]), as well as the vowel [i], are often realized simultaneously at the alveolar and palatal zones. Moreover, while some of these sound categories may also exhibit a palatal constriction ([ç c ɲj i]), others are exclusively alveolar or alveolopalatal in line with the manner of articulation characteristics involved ([ʎ], also [ɕ] and [tʃ]). Consonants may favor one or more places of articulation and differ in fronting degree depending on the language taken into consideration; moreover, there appears to be a symmetry requirement by which consonants differing in manner, such as [c] and [ɲ], may agree in place. The data reported in this paper argue in favor of a revision of the articulatory classification of palatal consonants by the International Phonetic Alphabet involving their subdivision into two classes, an alveolopalatal and a palatal one.
Alveolo-palatal consonant
In phonetics, alveolo-palatal (or alveopalatal) consonants are palatalized postalveolar sounds. They are usually fricatives and affricates. We pronounce them with the blade of the tongue behind the alveolar ridge, and the body of the tongue raised toward the palate. These consonants are similar to palato-alveolar consonants, but alveolo-palatal consonants are more fully palatalized. Sibilants
We often use the alveolo-palatal sibilants in the Chinese languages (e.g.Mandarin, Hakka, and Wu), and other languages in the East Asian sprachbund (e.g.Japanese and Korean). Many slavic languages (e.g.Polish, Russian and Serbo-Croatian) also contains alveolo-palatal sibilants. Northwest Caucasian languages (e.g. Abkhaz and Ubykh) also use this consonant. Kinnauri uses an alveolo-palatal nasal. The alveolo-palatal consonants in the International Phonetic Alphabet are:
Stops, nasals and liquids
The sinological circles sometimes use (ȶ, ȡ), (ȵ), and (ȴ) for alveolo-palatal plosives, nasals and liquids. But the IPA does not accept these symbols. We sometimes use these symbol to represent simple palatal or platalized consonants.
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