Inverse Filter Design Using Minimax Approximation Techniques for 3-D Audio

This paper presents a novel approach for implementing immersive audio rendering filters for a single listener using loudspeakers. We address the problem of crosstalk cancellation inherent in loudspeaker rendering and propose to implement the crosstalk cancellation filters using minimax finite impulse response (FIR) filters. The formulation is based on the Atal-Schroeder crosstalk canceller. The use of the optimal FIR filter design procedure ensures significant amount of separation between the direct path and the cross path. An alternative topology which requires the approximation of just one filter has also been explored using the same design principles. The minimax techniques provides superior solutions as compared to a least-squares design and the alternate structure is shown to be robust in its performance