A note on cancellation path modeling signal in active noise control

This communication analyzes the performance of using band stop (BS) signal for on-line cancellation path modeling in active noise control when the disturbance is a tonal or narrow band signal. It is shown theoretically and experimentally that the modeling error is mainly caused by the corresponding spectral components of the modeling signal close to the central frequency of the disturbance signal. Thus using BS random signal as the modeling signal can significantly reduce the modeling error than using random signal if the frequency components of the BS random signal around the frequency of the disturbance signal is much less than that of random signal.