Active noise control systems based on acoustic particle velocity measurements

The paper describes a system of active noise suppression based on a one-meter long air duct with the section of 10×10 cm with built-in speakers imitating noise and anti-noise. The system of automatic noise suppression generates anti-noise in accordance with the signals from two acoustic sensors. The efficiency of suppressing acoustic feedback is analyzed. An active noise suppression system based on FPGA (field programmable gate array) was built. A microelectromechanical Microflown sensor directly measuring particle velocity is used as the reference signal sensor.