Ambulance siren noise reduction using noise power scheduling based online secondary path modeling for ANC System

Active noise control (ANC) system based on adaptive algorithm is an effective technique for acoustic noise reduction. FxLMS is a fairly robust algorithm but it gives inferior performance when secondary path is time varying, as a result, online secondary path modeling has been used. A variable step-size least mean square (VSS-LMS) algorithm with noise power scheduling is implemented in this paper to minimize the noise level. Computer simulations are done in MATLAB and substantial noise reduction in ambulance siren is obtained. The algorithm is implemented to reduce ambulance siren noise causes deterioration in the health of patient lying inside. The result shows that Active noise control (ANC) system using VSS-LMS with noise power scheduling reduces ambulance siren noise considerably by 49 dB.