Subband parallel cascade Volterra filter for linearization of loudspeaker systems

In this paper, we propose a low complexity realization for linearization of loudspeaker systems. Linearization of loudspeaker system is generally realized by a Volterra filter. However, Volterra filter has a problem of requiring a huge computational complexity. The Simplified Volterra Filter (SVF), which removes the lines along the main diagonal of the 2ndorder Volterra kernel, has been previously proposed as a way to reduce the computational complexity while maintaining the compensation performance for the nonlinear distortion. However, this method cannot greatly reduce the computational complexity. Hence, we propose a subband linearization system which consists of a subband parallel cascade realization method for the 2nd-order Volterra kernel and subband linear inverse filter. Experimental results show that this proposed linearization system can produce the same compensation ability as the conventional method while reducing the computational complexity.