The most common sound represented by the letter r in English is the voiced postalveolar approximant, pronounced a little more back and transcribed more precisely in IPA as ⟨ɹ̠⟩, but ⟨ɹ⟩ is often used for convenience in its place. For further ease of typesetting, English phonemic transcriptions might use the symbol ⟨r⟩ even though this symbol represents the alveolar trill in phonetic transcription.
The bunched or molar r sounds remarkably similar to the postalveolar approximant and can be described as a voiced labial pre-velar approximant with tongue-tip retraction. It can be transcribed in IPA as ⟨ψ⟩[1] or ⟨ɹ̈⟩.
^Acoustic-phonetic characteristics of the Brazilian Portuguese's retroflex /r/: data from respondents in Pato Branco, Paraná Archived 2016-03-03 at the Wayback Machine. Irineu da Silva Ferraz. Pages 19–21 (in Portuguese)
^Recasens (2004:436) citing Fougeron (1999) and Browman & Goldstein (1995)
^Engstrand (1999:141)
^Thompson (1959:459)
^Merrill (2008:109)
^Hallé, Best & Levitt (1999:283) citing Delattre & Freeman (1968), Zawadzki & Kuehn (1980), and Boyce & Espy-Wilson (1997)
^Ikekeonwu (1999:108)
^ a bPuech (2013:74)
^ a bValenzuela, Márquez Pinedo & Maddieson (2001:282)
^Ladefoged & Maddieson (1996:240–241)
References
Arvaniti, Amalia (2007), "Greek Phonetics: The State of the Art" (PDF), Journal of Greek Linguistics, 8: 97–208, doi:10.1075/jgl.8.08arv, archived from the original (PDF) on 2013-12-11
Bakkes, Pierre (2007), Mofers Waordebook (in Dutch), Stichting Mofers Waordebook, ISBN 978-90-9022294-3
Boyce, S.; Espy-Wilson, C. (1997), "Coarticulatory stability in American English /r/", Journal of the Acoustical Society of America, 101 (6): 3741–3753, Bibcode:1997ASAJ..101.3741B, CiteSeerX10.1.1.16.4174, doi:10.1121/1.418333, PMID 9193061
Browman, C.P.; Goldstein, L. (1995), "Gestural syllable position in American English", in Bell-Berti, F.; Raphael, L.J. (eds.), Producing Speech: Contemporary Issues: for Katherine Safford Harris, New York: AIP, pp. 9–33
Cornyn, William (1944), Outline of Burmese Grammar, Supplement to Language, vol. 20 no. 4, Baltimore: Linguistic Society of America
Delattre, P.; Freeman, D.C. (1968), "A dialect study of American R's by x-ray motion picture", Linguistics, 44: 29–68
Engstrand, Olle (1999), "Swedish", Handbook of the International Phonetic Association, Cambridge University Press, pp. 140–142, ISBN 9780521637510
Fougeron, C (1999), "Prosodically conditioned articulatory variation: A Review", UCLA Working Papers in Phonetics, vol. 97, pp. 1–73
Grønnum, Nina (2003), "Why are the Danes so hard to understand?", in Jacobsen, Henrik Galberg; Bleses, Dorthe; Madsen, Thomas O.; Thomsen, Pia (eds.), Take Danish - for instance: linguistic studies in honour of Hans Basbøll, presented on the occasion of his 60th birthday, Odense: Syddansk Universitetsforlag, pp. 119–130
Hallé, Pierre A.; Best, Catherine T.; Levitt, Andrea (1999), "Phonetic vs. phonological influences on French listeners' perception of American English approximants", Journal of Phonetics, 27 (3): 281–306, doi:10.1006/jpho.1999.0097
Ikekeonwu, Clara I. (1999), "Igbo", Handbook of the International Phonetic Association, Cambridge University Press, pp. 108–110, ISBN 9780521637510
Khan, Sameer ud Dowla (2010), "Bengali (Bangladeshi Standard)" (PDF), Journal of the International Phonetic Association, 40 (2): 221–225, doi:10.1017/S0025100310000071
Kohler, Klaus (1995), Einführung in die Phonetik des Deutschen, Berlin: Erich Schmidt Verlag
Maddieson, Ian; Spajić, Siniša; Sands, Bonny; Ladefoged, Peter (1993), "Phonetic structures of Dahalo", in Maddieson, Ian (ed.), UCLA working papers in phonetics: Fieldwork studies of targeted languages, vol. 84, Los Angeles: The UCLA Phonetics Laboratory Group, pp. 25–65
Merrill, Elizabeth (2008), "Tilquiapan Zapotec" (PDF), Journal of the International Phonetic Association, 38 (1): 107–114, doi:10.1017/S0025100308003344
Moosmüller, Sylvia; Schmid, Carolin; Brandstätter, Julia (2015), "Standard Austrian German", Journal of the International Phonetic Association, 45 (3): 339–348, doi:10.1017/S0025100315000055
Puech, Gilbert (2013), "Prime constituents of Maltese sounds", in Borg, Albert; Caruana, Sandro; Vella, Alexandra (eds.), Perspectives on Maltese Linguistics, Berlin: Akademie Verlag GmbH, pp. 61–88, ISBN 978-3-05-006275-4
Recasens, Daniel (2004), "The effect of syllable position on consonant reduction (evidence from Catalan consonant clusters)", Journal of Phonetics, 32 (3): 435–453, doi:10.1016/j.wocn.2004.02.001
Valenzuela, Pilar M.; Márquez Pinedo, Luis; Maddieson, Ian (2001), "Shipibo", Journal of the International Phonetic Association, 31 (2): 281–285, doi:10.1017/S0025100301002109
Thompson, Laurence C. (1959), "Saigon Phonemics", Language, 35 (3), Linguistic Society of America: 454–476, doi:10.2307/411232, JSTOR 411232
Watkins, Justin (2001), "Illustrations of the IPA: Burmese" (PDF), Journal of the International Phonetic Association, 31 (2): 291–95, doi:10.1017/S0025100301002122, S2CID 232344700
Zawadzki, P.A.; Kuehn, D.P. (1980), "A cineradiographic study of static and dynamic aspects of American English /r/", Phonetica, 37 (4): 253–266, doi:10.1159/000259995, PMID 7443796, S2CID 46760239