US Patent 9066171 Loudspeaker protection apparatus and method thereof

An apparatus comprises at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: determine at least one parameter of a transducer on the basis of received information; and modify a received signal for actuating the transducer on the basis of the determined parameters of the transducer and a frequency spectrum of the received signal. The apparatus protects the transducer from damage due to excessive displacement caused by the received signal.