Speech and Vision Lab

Cognitive loaded speech is produced when a speaker experiences the load imposed by a cer- tain task on the cognitive system and it can be regarded as deviation from neutral speech. The objective of the present study is to explore the deviations in the excitation source features of cognitive loaded speech compared to neu- tral speech. The excitation source features considered in this study are, Instantaneous fundamental frequency (F 0 ), Strength of ex- citation (SoE), Energy of excitation (EoE) and Perceived loudness (?). For the extraction of these excitation source features, two signal processing techniques are used, namely Zero frequency filtering (ZFF) and Linear Predic- tion (LP) analysis. A comparative study of ex- citation source features across different cogni- tive loaded speech indicates that there are sig- nificant deviations in the excitation source fea- tures of cognitive loaded speech compared to neutral speech.