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In this paper, three systems for classification of stress in speech are proposed. The first system makes use of linear short time Log Frequency Power Coefficients (LFPC), the second employs Teager Energy Operator (TEO) based Nonlinear Frequency Domain LFPC features (NFD-LFPC) and the third uses TEO based Nonlinear Time Domain LFPC features (NTD-LFPC). The systems were tested using SUSAS (Speech Under Simulated and Actual Stress) database to categorize five stress conditions individually.doi:10.1109/icassp.2003.1202281 dblp:conf/icassp/NweFS03 fatcat:6heqiv2dxzaf7feyyzcneidpp4