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Abstract

The debate about the rhotic sound in Standard Mandarin (i.e., Putonghua) focuses on its articulation as a retroflex and its classification as either a fricative or an approximant. To address these questions, this study examines the syllable-initial r-sound, quantifying tongue contours for the r-phoneme itself and in relation to the retroflex sibilants (i.e., /ʂ, tʂ^h, tʂ/). Both established and novel articulatory and acoustic measures are employed to assess their effectiveness in distinguishing phonetic contrasts. The ultrasound imaging results reveal that Putonghua onset /r/ is articulated with either a tip-up retroflex or a tip-down bunched tongue posture, specifying both coronal and dorsal gestures. Compared to /ʂ, tʂ^h, tʂ/, the syllable-initial /r/ is produced with a greater degree of tip-up retroflexion and more pronounced tongue inflections, supported by vertical tongue displacement and discrete Fourier transform measurements. Acoustically, Putonghua /r/ is most often produced without frication and is characterized by low F3, F3F2 distance and zero crossing rates. The results find that even the fricated /r/ variant remains substantially distinct from sibilants both in tongue gestures and acoustic properties. The study argues that this phoneme should be classified as a retroflex approximant, transcribed as [ɻ], rather than a fricative [ʐ]. The results contribute substantial evidence to the limited articulatory corpus and enhance the understanding of the Putonghua rhotic’s articulatory-acoustic correspondence, highlighting the importance of contextualizing phonetic variability within the phonology of the language.

Keywords

Rhotic ultrasound Mandarin tongue shape quantification

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The Articulatory and Acoustic Variability in Putonghua Onset /r/

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