Figure 5
From: Exploiting Nonlinear Recurrence and Fractal Scaling Properties for Voice Disorder Detection
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 n 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.