1. A method for separating multiple audio signals recorded as a mixed signal via a single channel, comprising: sampling the mixed signal to obtain a plurality of frames of samples; applying a discrete Fourier transform to the samples of each frame to obtain a power spectrum for each frame; determining a logarithm of the power spectrum of each frame; determining, for pairs of logarithms, an a posteriori probability; obtaining, for each frame and each audio signal of the mixed signal, a Fourier spectrum from the a posteriori probabilities; inverting the Fourier spectrum of each audio signal in each frame; and concatenating the inverted Fourier spectrum for each audio signal in each frame to separate the multiple audio signals in the mixed signal.