1. A method of filtering noise from a mixed sound signal to obtained a filtered target signal, comprising the steps of: inputting the mixed signal through a pair of microphones into a first channel and a second channel; separately Fourier transforming each said mixed signal into the frequency domain; computing a signal short-time spectral amplitude |Ŝ| from said transformed signals; computing a signal short-time spectral complex exponential e i arg(S) from said transformed signals, where arg(S) is the phase of the target signal in the frequency domain; computing said target signal S in the frequency domain from said spectral amplitude and said complex exponential.