A NOVEL APPROACH TO ACTIVE NOISE CONTROL BASED ON WAVE DOMAIN ADAPTIVE FILTERING

摘要

Wave Field Analysis and Synthesis are methods which permit 3D sound field recording and reproduction. They are based on the precise extrapolation and reconstruction of the desired wave field by using arrays of microphones and loudspeakers. In order to utilize these techniques in real world applications (e.g. cinema, home theatre, teleconferencing) it is necessary to apply multi-channel Digital Signal Processing algorithms, already developed for traditional systems. In this paper we approach the problem of Active Noise Control (ANC) from the mentioned point of view: we will present two cancellation schemes depending on whether the noise sources are localized in the recording room or in the reproduction environment. The two algorithms make use of the spatio-temporal transforms, on which Wave Domain Adaptive Filtering (WDAF) is based, in order to reduce the computational complexity. It will be shown through numerical simulations that it is possible to suppress noise sources localized either inside or outside the recording/reproduction area.