“…While functionally similar to that of their public-switched telephone network (PSTN) counterparts, speech recognition systems and applications that include a wireless link with coding such as GSM confront the end user with the additional potential problems of wireless-channel noise, data dropouts, and signal degradation originated by the speech codec. Mobile applications provide the additional problem of potentially more varied and more intense environmental noise (Mokbel et al, 1996;HaebUmbach, 1997). These phenomena result in error rates for speech recognition systems which are substantially higher than their counterparts in non-mobile environment (e.g., Das et al, 1999;Delphin-Poulat and Mokbel, 1997;Elvira and Torrecilla, 1998;Mokbel et al, 1996).…”