In this paper a non-linear loudspeaker model, which accurately reproduces thelow frequency behavior, is presented. This description, derived from an extension ofthe well known Small-Thiele equations, requires far less computational time andmemory space than generic non-linear structures. Moreover a noticeablefurther reduction of the number of operations and of the memory cells required has been achieved by means of a multirate architecture. Inversion of the proposed model allows digital prefiltering of the electrical signal in order to compensate for the non idealities of the electroacoustic conversion.The above filter structure implemented on a digital signal processor, placed betweenthe audio signal source and the power amplifier allows effective compensation ofloudspeaker linear (both magnitude and phase) and non linear distortion.Measurement results obtained with a commercial woofer are discussed.
Non-linear Digital Audio Processor for dedicated Loudspeaker Systems / Bellini, Alberto; G., Cibelli; E., Ugolotti; A., Farina; C., Morandi. - In: IEEE TRANSACTIONS ON CONSUMER ELECTRONICS. - ISSN 0098-3063. - ELETTRONICO. - 44:(1998), pp. 1024-1031.