Fricative consonants: acoustic and X-ray measurements  

Oleh:

Badin, P.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Journal of Phonetics vol. 19 no. 3/4 (Jul. 1991), page 397-408.

Ketersediaan

Perpustakaan PKBB Nomor Panggil: 405/JOP/19 Non-tandon: tidak ada Tandon: 3

Lihat Detail Induk

Isi artikel

The aim of this study is to uncover experimentally the acoustic characteristics of the noise source for voiceless fricatives by removing the filtering effects of the vocal tract through inverse filtering. The acoustic transfer functions between glottis and lips were measured experimentally for two subjects while they silently articulated six different sustained voiceless fricatives ([f, 0, s, f, c, x]). The method involves the transcutaneous excitation of the vocal tract with white noise and the estimation of the spectrum of the pressure signal picked up at the lips. Corresponding sound spectra measurements were also made. In addition, conventional midsaggital X-ray pictures of the vocal tracts were obtained for the subjects during the sustained production of the same fricatives. These provided a first estimate of the corresponding area functions, which were then refined using sensitivity functions in order to achieve the best match between the measured transfer functions and the simulated ones. The location of the source was estimated from the frequency of the zeros detected in the sound spectra, and the transconductance was computed. Finally, the spectrum of the source was obtained by subtracting the transconductance from the sound spectrum. A clear mapping was also established between the different peaks measured in the sound spectra or transfer functions and the different cavities, especially in relation to front/back cavity coupling through the constriction channel.

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