Patent ID: 7895038

Claim:
A signal enhancement device comprising: a spectral subtraction unit for subtracting a given reference signal from a main input signal containing a target signal and a noise signal by spectral subtraction; first and second signal conversion devices, each of which converts an acoustic signal into an electric signal; an adaptive filter applied to said reference signal; a filter coefficient update unit for controlling a filter coefficient of said adaptive filter in order to reduce the noise signal component in said main input signal; and a database of a signal model concerning said target signal expressing a given feature concerning the target signal by means of a given statistical model, wherein said filter coefficient control update unit performs control of said filter coefficient based on a likelihood of said signal model with respect to an output signal from said spectral subtraction unit; wherein said main input signal is obtained by adding respective output signals from said first and second signal conversion means in a way that said target signals respectively contained in said output signals are added in the same phase; and wherein said reference signal is obtained by adding said respective output signals from said first and second signal conversion means in a way that said target signals respectively contained in said output signals are added in the opposite phases.