“…To this aim, several non linear speech processing techniques have been proposed, such as non linear parametric and non parametric autoregressive models, speech fluid dynamics, modulation, and fractal methods. Some of these methods are theoretically discussed in this volume by Bastari et al [3], Chollet et al [7], Faundez-Zanuy [24], Haykin [33], Kubin et al [43], Murphy and Akande [46], Petek [57], and Stylianou [81]. The results are very encouraging, showing that nonlinear speech processing methods offers a good alternative to conventional speech encoding techniques.…”