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This paper deals with an analysis of power spectra of prolonged Czech sibilants /s/, /sh/, /z/, /zh/. Several approaches based on an approximation of the power spectral density (PSD) in several frequency bands were used. The experiments performed used a linear and a quadratic approximation in the frequency bands 1–3 kHz and 3–6 kHz, a cubic approximation in the frequency band 1–6 kHz and the Bézier...
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