SPECTRAL ANALYSIS OF SIBILANT FRICATIVES AND THE LING SOUND TEST FOR SPEAKERS OF CHINESE DIALECTS Aijun LIa & Zhiqiang LIb aChinese Academy of Social Sciences, China; bUniversity of San Francisco, USA
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[email protected] ABSTRACT The speech sounds used in the test include three vowels /i/, /u/, /a/, two sibilant fricatives /s/, /ʃ/, and a The Ling six-sound test is widely used clinically to nasal /m/, which was added later due to its low verify effectiveness of hearing aids or cochlear frequency content. The test was subsequently referred implant fitting. When the Ling test is administered to to as the Ling six-sound test [12]. Table 1 shows speakers of major Chinese dialects, decisions have to frequency distributions of the six sounds [12, 14]. be made about the specific sounds to use based on Based on the values of center of gravity, /m/ is usually dialect-specific phonological contrasts and frequency used to assess hearing of the low-frequency sounds distribution patterns. Spectral properties of the while /s/ and /ʃ/ are used to test hearing of the high- sibilant fricatives and affricates were analyzed in frequency sounds. The three corner vowels are used Beijing, Wuhan and Xiamen. The results showed that to test perception of the vowel space defined by the in order to adequately encompass the whole first two formants F1 and F2. frequency range to accommodate the fact that the Table 1: Frequency distributions of the six sounds alveolar /s/ in all three dialects is produced with a in Hz. much higher center of gravity value than its English counterpart, a palatal /ɕ/ or /tɕʰ/ is introduced to Sounds F1 F2 Center of gravity represent the 5-7kHz range, along with the post- /m/ 250-500 alveolar /ʂ/ in Beijing and the aspirated alveolar /tsʰ/ /u/ 350 900 in Wuhan and Xiamen, leading to a revised seven- /a/ 700 1300 sound test.