Wireless Sensing for Active Noise Control

Our paper introduces a closed-loop wireless control application based on Berkeley MICAz motes and an Analog Devices AD21061 EZ-KIT LITE board. The system realizes active noise control (ANC) for the suppression of periodic acoustic disturbances. The paper highlights the role of synchronous sampling in wireless ANC applications and introduces the solutions in detail. A PLL-like mechanism takes care of the synchronization, while linear interpolation fits the wireless measurement data for processing in the signal processor. The noise controller is a resonator-based one which has proven its efficiency previously in different physical environments. The working of the system is illustrated by measurement results.