A voiceless palato-alveolar sibilant affricate or voiceless domed postalveolar sibilant affricate is a type of consonantal sound used in some spokenlanguages. It is familiar to English-speakers as the "ch" sound in "chip".
This sound is transcribed in the International Phonetic Alphabet with ⟨tʃ⟩, ⟨t͡ʃ⟩, ⟨t͜ʃ⟩, or, in broad transcription, ⟨c⟩. There is also a ligature ⟨ʧ⟩, which was retired by the International Phonetic Association but is still used. An alternative commonly used in Americanist tradition is ⟨č⟩.
Features of a voiceless domed postalveolar affricate:
Its manner of articulation is sibilantaffricate, which means it is produced by first stopping the air flow entirely, then directing it with the tongue to the sharp edge of the teeth, causing high-frequency turbulence.
Its phonation is voiceless, which means it is produced without vibrations of the vocal cords. In some languages the vocal cords are actively separated, so it is always voiceless; in others the cords are lax, so that it may take on the voicing of adjacent sounds.
It is an oral consonant, which means that air is not allowed to escape through the nose.
It is a median consonant, which means it is produced by directing the airstream down the midline of the tongue, rather than to the sides.
/ʈ͡ʂ/ and /t͡ɕ/ merge into [t͡ʃ] in these dialects. In standard Polish, /t͡ʃ/ is commonly used to transcribe what actually is a laminal voiceless retroflex affricate.
Allophone of /t/ before /i,ĩ/ (including when [i,ĩ,j] is not actually produced) and other instances of [i] (e.g. epenthesis), marginal sound otherwise. See Portuguese phonology
Its manner of articulation is affricate, which means it is produced by first stopping the airflow entirely, then allowing air flow through a constricted channel at the place of articulation, causing turbulence.
Its place of articulation is postalveolar, which means it is articulated with either the tip or the blade of the tongue behind the alveolar ridge.
Its phonation is voiceless, which means it is produced without vibrations of the vocal cords. In some languages the vocal cords are actively separated, so it is always voiceless; in others the cords are lax, so that it may take on the voicing of adjacent sounds.
It is an oral consonant, which means that air is not allowed to escape through the nose.
It is a median consonant, which means it is produced by directing the airstream down the midline of the tongue, rather than to the sides.
Martínez-Celdrán, Eugenio; Fernández-Planas, Ana Ma.; Carrera-Sabaté, Josefina (2003). "Castilian Spanish". Journal of the International Phonetic Association. 33 (2): 255–259. doi:10.1017/S0025100303001373.
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