A voiceless palato-alveolar fricative or voiceless domed postalveolar fricative is a type of consonantal sound used in many languages, including English. In English, it is usually spelled ⟨sh⟩, as in ship.
Features of the voiceless palato-alveolar fricative:
Its manner of articulation is sibilantfricative, which means it is generally produced by channeling air flow along a groove in the back of the tongue up to the place of articulation, at which point it is focused against the sharp edge of the nearly clenched 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 air is allowed to escape through the mouth only.
It is a central consonant, which means it is produced by directing the airstream along the center of the tongue, rather than to the sides.
/ʂ/ and /ɕ/ merge into [ʃ] in these dialects. In standard Polish, /ʃ/ is commonly used to transcribe what actually is a laminal voiceless retroflex sibilant
In various languages, including English and French, it may have simultaneous labialization, i.e. [ʃʷ], although this is usually not transcribed.
Classical Latin did not have [ʃ], though it does occur in most Romance languages. For example, ⟨ch⟩ in French chanteur "singer" is pronounced /ʃ/. Chanteur is descended from Latin cantare, where ⟨c⟩ was pronounced /k/. The ⟨sc⟩ in Latin scientia "science" was pronounced /sk/, but has shifted to /ʃ/ in Italian scienza.
Similarly, Proto-Germanic had neither [ʃ] nor [ʂ], yet many of its descendants do. In most cases, this [ʃ] or [ʂ] descends from a Proto-Germanic /sk/. For instance, Proto-Germanic *skipą ("hollow object, water-borne vessel larger than a boat") was pronounced /ˈski.pɑ̃/. The English word "ship" /ʃɪp/ has been pronounced without the /sk/ the longest, the word being descended from Old English "scip" /ʃip/, which already also had the [ʃ], though the Old English spelling etymologically indicated that the old /sk/ had once been present.
This change took longer to catch on in West Germanic languages other than Old English, though it eventually did. The second West Germanic language to undergo this sound shift was Old High German. In fact, it has been argued that Old High German's /sk/ was actually already [s̠k], because a single [s] had already shifted to [s̠]. Furthermore, by Middle High German, that /s̠k/ had shifted to [ʃ]. After High German, the shift most likely then occurred in Low Saxon. After Low Saxon, Middle Dutch began the shift, but it stopped shifting once it reached /sx/, and has kept that pronunciation since. Then, most likely through influence from German and Low Saxon, North Frisian experienced the shift.
Then, Swedish quite swiftly underwent the shift, which resulted in the very uncommon [ɧ] phoneme, which, aside from Swedish, is only used in Colognian, a variety of High German, though not as a replacement for the standard High German /ʃ/ but a coronalized /ç/. However, the exact realization of Swedish /ɧ/ varies considerably among dialects; for instance, in Northern dialects it tends to be realized as [ʂ]. See sj-sound for more details. Finally, the last to undergo the shift was Norwegian, in which the result of the shift was [ʃ].
The voiceless postalveolar non-sibilant fricative is a consonantal sound. As the International Phonetic Alphabet does not have separate symbols for the post-alveolar consonants (the same symbol is used for all coronal places of articulation that are not palatalized), this sound is usually transcribed ⟨ɹ̠̊˔⟩ (retracted constricted voiceless [ɹ]). The equivalent X-SAMPA symbol is r\_-_0_r.
Some scholars also posit the voiceless postalveolar approximant distinct from the fricative. The approximant may be represented in the IPA as ⟨ɹ̠̊⟩.
Features
Its manner of articulation is fricative, which means it is produced by constricting air flow through a narrow channel at the place of articulation, causing turbulence. However, it does not have the grooved tongue and directed airflow, or the high frequencies, of a sibilant.
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 air is allowed to escape through the mouth only.
It is a central consonant, which means it is produced by directing the airstream along the center of the tongue, rather than to the sides.
Only partially devoiced. It is a realization of /r/ after the word-initial fortis plosives /p,k/, unless they are preceded by /s/ within the same syllable.[30] See English phonology
^Gussenhoven & Aarts (1999:156). The authors state that /ʃ/ is "pre-palatal, articulated with the blade of the tongue against the post-alveolar place of articulation". This makes it unclear whether this sound is palato-alveolar (somewhat palatalized post-alveolar) or alveolo-palatal (strongly palatalized post-alveolar).
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Merrill, Elizabeth (2008), "Tilquiapan Zapotec", Journal of the International Phonetic Association, 38 (1): 107–14, doi:10.1017/S0025100308003344
Oftedal, Magne (1956), A linguistic survey of the Gaelic dialects of Scotland, Vol. III: The Gaelic of Leurbost, Isle of Lewis, Oslo: Norsk Tidskrift for Sprogvidenskap
Roach, Peter (2004), "British English: Received Pronunciation", Journal of the International Phonetic Association, 34 (2): 239–45, doi:10.1017/S0025100304001768
Rogers, Derek; d'Arcangeli, Luciana (2004), "Italian", Journal of the International Phonetic Association, 34 (1): 117–21, doi:10.1017/S0025100304001628
