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Active noise control (ANC) uses the Intentional superposition of acoustic waves to create a destructive interference pattern and thus reduce the level of unwanted sound This is realised by arti cially generating cancelling source(s) through detecting and processing the noise by anelectronic controller of suitable frequency-dependent characteristics.Due to the broadband nature of the noise emitted by practical sources the controller is required to realise suitable frequency ' dependent characteristics so that to properly adjust theamplitude and phase of every tone of the noise.Witlt a suitable design method.it is possible to measure/estimate and realise the required controller transfer characteristics either as an analogue or digital or hybrid controller 1.2.
M. O. Tokhi (Wed,) studied this question.