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Active noise control (ANC) over a sizeable space requires a large number ofreference and error microphones to satisfy the spatial Nyquist samplingcriterion, which limits the feasibility of practical realization of suchsystems. This paper proposes a mode-domain feedforward ANC method to attenuatethe noise field over a large space while reducing the number of microphonesrequired. We adopt a sparse reference signal representation to preciselycalculate the reference mode coefficients. The proposed system consists ofcircular reference and error microphone arrays, which capture the referencenoise signal and residual error signal, respectively, and a circularloudspeaker array to drive the anti-noise signal. Experimental results indicatethat above the spatial Nyquist frequency,our proposed method can perform wellcompared to a conventional methods. Moreover, the proposed method can evenreduce the number of reference microphones while achieving better noiseattenuation.

Mode Domain Spatial Active Noise Control Using Sparse Signal Representation