Abstract
The idea of active noise control is an attenuation of unwanted noise with an additionally generated acoustic wave using the phenomenon of interference. Its technical realization employs advanced control algorithms. Active noise control is an area of intense research and practical engineering applications. In the paper a new structure of adaptive active noise control systems is proposed. Compared with classical control systems used for active noise control, the proposed structure contains in an error signal measurement path an additional discrete-time filter that estimates signal values at the input of this path. These estimates are then used to tune the corresponding adaptive filter. Properties of the proposed adaptive active noise control structure are illustrated by simulation examples in which a feedforward control system equipped with this additional filter is used to attenuate unwanted wide-sense stationary random noises with continuous and mixed spectra.
Highlights
Active noise control is a very interesting technique used presently by researchers and engineers in different areas of their activity
The paper is organized as follows: (1) The problem of the lack of optimality of classical active noise control system designs is stated; (2) a new active noise control system structure that uses estimates of signal at the input of error signal measurement path in adaptation process is proposed; and (3) properties of the proposed new active noise control system structure are illustrated by simulation case studies of attenuation of wide-sense stationary Gaussian random noises with continuous and mixed spectra in active noise control structures employing models of electro-acoustical plants with different dynamical properties
The presented discussion was illustrated by simulation case studies that showed the effectiveness of the proposed new active noise control system structure
Summary
Active noise control is a very interesting technique used presently by researchers and engineers in different areas of their activity. An additional discrete-time filter is placed in the error signal measurement path following the A/D converter This filter may be used for residual error shaping in active noise control [13,14,15,16,17] or to increase the rate of convergence of the adaptation process [18,19,20,21,22]. The paper is organized as follows: (1) The problem of the lack of optimality of classical active noise control system designs is stated; (2) a new active noise control system structure that uses estimates of signal at the input of error signal measurement path in adaptation process is proposed; and (3) properties of the proposed new active noise control system structure are illustrated by simulation case studies of attenuation of wide-sense stationary Gaussian random noises with continuous and mixed spectra in active noise control structures employing models of electro-acoustical plants with different dynamical properties
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