1. A method ( 1 ) for classifying at least one audio signal (A) into at least one audio class (AC), the method ( 1 ) comprising the steps of: analyzing ( 10 ) said audio signal to extract at least one predetermined audio feature; performing ( 12 ) a frequency analysis on a set of values of said audio feature at different time instances; deriving ( 12 ) at least one further audio feature representing a temporal behavior of said audio feature based on said frequency analysis; and classifying ( 14 ) said audio signal based on said further audio feature.