Active Noise Reduction Algorithm Based on NOTCH Filter and Genetic Algorithm

Abstract

Application of active noise reduction (ANR) systems in hearing protectors requires the use of control algorithms to ensure stability of the ANR system and at the same time highly effective active noise reduction. A control algorithm based on NOTCH filters is an example of solutions that meet these criteria. Their disadvantage is operation over a narrow frequency band and a need for prior determination of frequencies to be reduced. This paper presents a solution of the ANR system for hearing protectors which is controlled with the use of modified NOTCH filters with parameters determined by a genetic algorithm. Application of a genetic algorithm allows to change the NOTCH filter reference signal frequency, and thus, adapt the filter to the reduced signal frequency.

Active Noise Control with a Single Nonlinear Control Filter for a Vibrating Plate with Multiple Actuators

“…Otherwise, more complex algorithms such as genetic algorithms (Górski, Morzyński, 2013) or memetic algorithms should be employed.…”

Sound Radiation from a Surface Source Located at the Bottom of the Wedge Region

“…Therefore, active noise control as well as theoretical investigations are of considerable importance in the case of such sound sources. The methods based on the use of piezoelectric elements and various algorithms have been proposed to reduce the vibrations of structures (Górski, Morzyński, 2013; Leniowska, 2009; Mazur, Pawełczyk, 2013; Wiciak, Trojanowski, 2013). Acoustic behaviour of vibrating surfaces can be predicted on the basis of theoretical investigations.…”