A spectral subtraction based adaptive noise cancellation method for sonar system

Adaptive Noise Suppression is one of the key research areas of sonar signal processing.Conventional adaptive noise suppression methods necessitate additional array(or element) to obtain pure noisy signal,which is not realizable in practical engineering applications.Without the additional array,a method is proposed in this paper which combines the outputs of two-adjacent elements to produce a third signal that free of the signal from a certain direction.This,together with the spectral-subtraction procedure(which have found wide spread applications in speech signal processing),leads to effective noise cancellation.