SONIC (Self-Optimizing Narrowband Interference Canceller) is an acronym of the recently proposed active noise control algorithm with interesting adaptivity and robustness properties. SONIC is a purely feedback controller, capable of rejecting nonstationary sinusoidal disturbances (with time-varying amplitudes and/or frequencies) in the presence of plant (secondary path) uncertainties. We show that even though SONIC can work reliably without access to the reference signal, when frequency of the disturbance is unknown and possibly time-varying the algorithm can take advantage of such an additional source of information. Unlike the classical feedforward solutions, the reference signal is used only to extract information about the instantaneous frequency of the disturbance. The time advantage, available due to the fact that the acoustic delay in the system is larger than the electrical delay, allows one to incorporate in the control loop the smoothed, and hence more accurate, frequency estimates. This increases the attenuation efficiency of SONIC and widens its operating range - the modified algorithm can be safelyused in the presence of faster frequency changes.
Authors
Additional information
- Category
- Aktywność konferencyjna
- Type
- publikacja w wydawnictwie zbiorowym recenzowanym (także w materiałach konferencyjnych)
- Language
- angielski
- Publication year
- 2011
