A Spherical-Harmonic Domain Selective Spatial Active Noise Control System Based on Sound Field Reproduction

Spatial active noise control (ANC) systems aim to control the noise field over a spatial region. However, when both the desired field and the interference field co-exist, typical ANC systems lack the ability to selectively reduce the interference field, resulting in distortions in the desired field. In this paper, we design a spherical-harmonic domain selective spatial ANC system to reduce the interference field and preserve the desired field. The designed system integrates a desired field extraction (DFE) process, a sound field reproduction (SER) process, and an ANC process. The DFE and SFR processes are implemented to first capture and then reproduce the desired field, while the ANC process reduces the pseudo residual field. The simulation study shows that compared to two existing ANC solutions, the proposed design achieves a better overall performance with an acceptable speech-distortion-ratio within the sweet area in a reverberant environment