Siren noise attenuation by non-linear processing of time-frequency information

Siren signals are used to warn other cars and pedestrian about the presence of an emergency vehicle, this signal is leaked into the communication path between the emergency vehicle and the emergency call centre and substantially degrades the intelligibility of speech signal. In past, research has been mainly focused on siren cancellation on the source of siren signal by using extra microphones which requires complex acoustic and electrical consideration. In this paper, two solutions and approach are presented for attenuation of the siren in an emergency call centre without having any knowledge about the emergency vehicle, type of siren and the presence of a siren.