Analysis of design parameters for crosstalk cancellation filters applied to different loudspeaker configurations

Several approaches to render binaural signals through loudspeakers have been proposed in the past decades. Some studies have focused on the optimum loudspeaker arrangement whereas others have proposed more efficient filters. However, to our knowledge the identification of optimum parameters for crosstalk cancellation filters applied to different loudspeaker configurations has not yet been addressed systematically. A study of three different inversion techniques applied to several loudspeaker arrangements is documented. Least-squares approximations in the frequency and time domains are evaluated along with a crosstalk canceler based on minimum-phase approximation with a frequency-independent delay. The three methods were applied to loudspeaker configurations with two channels and the least-squares approaches to configurations with four channels. Several different span angles and elevations were simulated for each case. In order to obtain optimum parameters the bandwidths, filter lengths and regularization constants were varied for each loudspeaker configuration and each method and a description is given of the simulations performed and the results obtained. The simulation results are documented in terms of channel separation index, optimum regularization constant, and performance error.