Effect of speech coding on recognition of Consonant-Vowel (CV) units

Abstract

The rapid growth of mobile users is creating great deal of interest in the development of robust speech systems in wireless environment. The major challenges involved in adapting the present speech processing technology to mobile wireless systems are: (1) Effect of varying background conditions in mobile environment. (2) Degradations introduced by the speech coders. (3) Errors introduced due to wireless radio channels. In this paper we analyzed the effect of different low bit rate speech coders on the recognition of Consonant-Vowel (CV) units in Indian languages using monolithic SVM and hybrid HMM-SVM models. Speech coders considered in this work are GSM full rate (ETSI 06.10), CELP (FS-1016), and MELP (TI 2.4kbps). From the results, it is observed that there is a significant effect of coding on the recognition of CV units. © 2010 Springer-Verlag Berlin Heidelberg.