Adaptive interference rejection using generalized sidelobe canceller in spherical harmonics domain

We present a simple but effective method for rejecting interferers with a spherical array in reverberant environments. The generalized sidelobe canceller is incorporated with norm constraints for preventing signal distortion which leads to robust beamforming. The proposed method is implemented in the spherical harmonics domain. With simulated environmental data, the proposed method shows better signal-to-distortion ratio compared to several previously proposed spherical beamformers. The proposed method is also demonstrated and validated with real-environmental data recorded with a spherical microphone array.