Some modifications were made to traditional adaptive GSC beamformer for application to speech enhancement in digital hearing aids.The voice activity detecting(VAD) result of fixed beamformer(FBF) output instead of signal to intecference ratio(SIR) served as the adaptation mode control during the process,and speech distortion caused by the beamforming process was taken into the consideration of cost function designed for the adaptive filter.As a result,the iterative formula was redefined in Multiple-input Ca...