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.
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