Residual noise shaping technique for active noise control systems

Abstract

An active noise control system attenuates the overall sound field. However, in some applications, it is desirable to change the spectral contents of the residual noise. In this Letter, a residual noise spectrum shaping technique based on the filtered-E least-mean-square algorithm has been developed. This technique can be applied to active noise control of one-dimensional ducts and three-dimensional enclosures, for both narrow-band and broadband noises. Computer simulations demonstrate that this method not only attenuates the noise level, but also effectively reshapes the spectrum of the residual noise.