An improved speech enhancement algorithm based on generalized sidelobe canceller

Abstract

In speech enhancement algorithm based on generalized sidelobe canceller (GSC), when there is error in direction estimating, the target speech will not be blocked by blocking matrix (BM) module completely. Then in the later multiple-input canceller (MC) module, the target speech will be eliminated, which will cause the leakage of the target speech. In this paper, a new optimization algorithm is proposed for the leakage of the speech caused by the error of signal direction of arrival (DOA). The blocking matrix would be adjusted adaptively according to the characteristics of the correlation between the final output of GSC and the output of BM module. This way, the estimated direction can be closer to the real target speech direction in the blocking matrix in order to reduce the leakage of the target speech and the leakage of the target speech in multiple-input canceller will be reduced. The simulation results show that the proposed algorithm have better speech enhancement performances in both objective and subjective evaluations.