A PARAMETRIC FORMULATION OF THE GENERALIZED SPECTRAL SUBTRACTION METHOD

In this paper, two short-time spectral amplitude estimators of the spe ech signal are derived based on a parametric formulation of the origin al generalized spectral subtraction method. The objective is to improv e the noise suppression performance of the original method while maint aining its computational simplicity, The proposed parametric formulati on describes the original method and several of its modifications. Bas ed on the formulation, the speech spectral amplitude estimator is deri ved and optimized by minimizing the mean-square error (MSE) of the spe ech spectrum. With a constraint imposed on the parameters inherent in the formulation, a second estimator is also derived and optimized. The two estimators are different from those derived in most modified spec tral subtraction methods, which are predominantly nonstatistical, When tested under stationary white Gaussian noise and semistationary Jeep noise, they showed improved noise suppression results.