Module for achieving audio spatialization, comprising computing means for applying at least one room-effect transfer function to at least one input audio signal, said application amounting to multiplying, in the spectral domain, spectral components of the audio signal by spectral components of a filter corresponding to said transfer function, each spectral component of the filter comprising a variation as a function of time in a time-frequency representation, characterized in that the computing means are configured to ignore said spectral components of the filter in said multiplications of components, beyond a threshold frequency and after at least one given time in said time-frequency representation and in that the module for achieving audio spatialization, which receives a plurality of input signals, delivers at least two output signals, the computing means being configured to apply a room-effect transfer function, to each input signal, module characterized in that each of said output signals is given by application of the following formula: O k = ∑ l = 1 L I l ∗ 0;...; f k l A k l + ∑ m = 1 M z − iDDm ⋅ ∑ l = 1 L G I l ⋅ 1 W k l ⋅ I l ∗ 0;...; f k m B mean k m - O k being an output signal, and k being the index relative to an output signal, - l ∈ [1; L], being the index relative to one input signal among said input signals, L being the number of input signals, and I ( l) being one input signal among said input signals, - A k ( l) being a transfer function with room effect specific to one input signal, - B mean k m being an overall transfer function, with room effect, common to the input signals, - W k ( l) being a selected weighting weight, and G ( I ( l)) being a predetermined energy compensation gain, - z -iDDm being an application of a delay, counted in number of blocks of samples, corresponding to a time difference between an audio emission in a room corresponding to the room effect, and an onset of presence of a diffuse field in this room, the index m corresponding to a number of blocks of samples of duration corresponding to this delay, M being the total number of blocks that a transfer function lasts in a time-frequency representation, - the sign "·" designating multiplication, - the sign "*[0;...; f k ( l)] " designating convolution over a limited number of frequencies ranging from a lowest frequency to a maximum frequency f k ( l) that is dependent at least on the input signal of index l, and - the sign "*[0;...; f k ( m)]" designating convolution over a limited number of frequencies ranging from a lowest frequency to a frequency f k ( m) that is dependent on the block of samples of index m. - O k being an output signal, and k being the index relative to an output signal, - l ∈ [1; L], being the index relative to one input signal among said input signals, L being the number of input signals, and I ( l) being one input signal among said input signals, - A k ( l) being a transfer function with room effect specific to one input signal, - B mean k m being an overall transfer function, with room effect, common to the input signals, - W k ( l) being a selected weighting weight, and G ( I ( l)) being a predetermined energy compensation gain, - z -iDDm being an application of a delay, counted in number of blocks of samples, corresponding to a time difference between an audio emission in a room corresponding to the room effect, and an onset of presence of a diffuse field in this room, the index m corresponding to a number of blocks of samples of duration corresponding to this delay, M being the total number of blocks that a transfer function lasts in a time-frequency representation, - the sign "·" designating multiplication, - the sign "*[0;...; f k ( l)] " designating convolution over a limited number of frequencies ranging from a lowest frequency to a maximum frequency f k ( l) that is dependent at least on the input signal of index l, and - the sign "*[0;...; f k ( m)]" designating convolution over a limited number of frequencies ranging from a lowest frequency to a frequency f k ( m) that is dependent on the block of samples of index m.