DFA analysis results. Results of scaling analysis carried out on two more example speech signals from the Kay database. (a) Normal voice (GPG1NAL) signal, (c) disordered voice (RWR14AN). Discrete-time signals s
shown over a limited range of n for clarity. (b) Logarithm of scaling window sizes L against the logarithm of fluctuation size F(L) for normal voice in (a). (d) Logarithm of scaling window sizes L against the logarithm of fluctuation size F(L) for disordered voice in (b). The values of L ranged from L = 50 to L = 100 in steps of five. In (b) and (d), the dotted line is the straight-line fit to the logarithms of the values of L and F(L) (black dots). The values of α and the normalised version α
norm show an increase for the disordered voice.