We present the design and implementation of a spatial active noise control (ANC) prototype for application to headrests. Unlike conventional ANC, which aims to suppress noise at the error microphone positions, spatial ANC aims to reduce noise within a three-dimensional target region. Spatial ANC based on kernel interpolation of sound fields has been shown to be effective due to its highly accurate sound field interpolation, efficient adaptive filtering algorithms, and flexibility in microphone and loudspeaker placement. However, these results have only been verified through simulations. We designed and implemented a spatial ANC prototype that uses control filters learned offline to suppress noise around the headrest. Through experiments using band-limited noise, we demonstrated that the proposed system achieves greater noise reduction in the target region than conventional ANC.
Hermawanto et al. (Wed,) studied this question.