A modular design for an active noise control system

This paper proposes a new modular design for implementation of active noise control (ANC) systems with online secondary path modeling. This design comprises of four similar modules to reduce the unwanted primary noise. One of these modules performs as the main adaptive control filter that uses an FxLMS algorithm to converge the tap-weights. Two other modules work as the adaptive modeling filters that use an LMS algorithm to model the secondary path filter. The last module works as a digital filter to produce the antinoise output signal. This innovative modular implementation of the ANC system results in a fast design and fast convergence with capability to expand the four adaptive filters and data bus when better noise reduction for ANC system is desired.