1. A method for simplifying a model of an acoustic environment ( 1 ), wherein said model comprises a set of transfer functions, each transfer function corresponding to the sound propagation ( 4 , 5 ) from a sound emitting position ( 2 ) to a sound receiving position ( 3 ) in said acoustic environment ( 1 ), the method comprising, for each transfer function, the step of: calculating a simulated reverberation of a first stimulus emitted at said sound emitting position as received at said sound receiving position by applying said transfer function to said first stimulus; characterised in that the method further comprises the steps of: selecting a subset ( 31 , 32 , 35 ) of a set of local maxima ( 31 , 32 , 33 , 34 , 35 ) in an intensity envelope ( 30 ) of the simulated reverberation; and calculating a simplified transfer function which, applied to said first stimulus, provides a simulated reverberation with an intensity envelope matching said selected subset ( 31 , 32 , 35 ) of local maxima ( 31 , 32 , 33 , 34 , 35 ).