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Fig. 9. Time series, spectrogram and spectra of an inspiratory sound. The spectra were derived from 50 ms segments centered around the dotted lines at the beginning and end of the call. The spectra A and B show the fast Fourier transform (FFT)-based spectrum (lower curve) and the linear predictive coding-based envelope of power spectrum (see Owren and Bernacki, 1998) indicating formant frequencies. While the fundamental frequency is increasing from 165 Hz to 170 Hz, the first resonance (F1) increases from 500 Hz to 850 Hz.





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