Application of Grey Filtering to Speech Enhancement

Abstract

In this paper, a speech enhancement approach based on grey filtering is proposed. In a previous paper [1], it is shown that additive noise can be estimated accurately by grey filtering approach with an appropriate scaling factor. Note that the spectral subtraction approach to speech enhancement is heavily dependent on the accuracy of statistics of additive noise and that the grey filtering is able to estimate additive noise appropriately. A magnitude spectral subtraction (MSS) approach for speech enhancement is proposed where the mechanism to determine the non-speech and speech portions is not required. Simulation results are provided to justify the proposed MSS approach based on grey filtering. It indicates that the objective of speech enhancement has been achieved by the proposed MSS approach.