1. A method of detecting an emotion conveyed in a voice signal, comprising the steps of: extracting ( 70 ) a set comprising at least one feature derived from said signal, and processing ( 84, 90 ) said set of extracted feature(s) to detect an emotion therefrom, characterised in that it comprises a step of low-pass filtering ( 74 ) said voice signal prior to extracting therefrom at least one said feature of said set.