A Non-linear ANC system for an aircraft's seat headrest

In present work an Active Noise Control System (ANCS) mounted on the headrest of an aircraft’s seat is proposed. It is based on the non-linear FsLMS algorithm alongside with a linear extrapolation technique used to estimate the acoustic pressure around the passenger’s ears. In order to check system’s effectiveness, real-time experiments took place inside an aircraft’s cabin mock-up for an acoustic disturbance measured during the flight of a tilt-rotor aircraft. The results have shown a more than 10 dB attenuation of different BPF harmonics and a significant SPL reduction that varies from 8 dB to 11 dB around the passenger’s ears.