Patent ID: 8194868

Claim:
A sound system comprising: a plurality of N input sources; a plurality of M output channels; a digital, signal processor connected with respect to the ˜put sources and the output channels; a bank of N×M finite impulse response filters positioned within the digital signal processor; a plurality of M summing points connected with respect to the finite impulse response filters, to superimpose wave fields of each input source of the plurality of input sources; an array of M loudspeakers, each loudspeaker of the array connected with respect to one summing point of the plurality of summing points; where the N×M finite impulse response filters are configured by providing at least one microphone positioned proximate to the array of M loudspeakers to measure an output of the loudspeakers and to obtain a matrix of impulse responses; configuring the N×M finite impulse response filters as linear phase upper equalization filters above an aliasing frequency by averaging acoustical energy configuring lower equalization filters up to the aliasing frequency according to a virtual, sound source by: specifying expected impulse responses corresponding to the virtual sound source at the microphone positions; subsampling up to the aliasing frequency; applying a multichannel iterative algorithm to compute equalization and position filters corresponding to the virtual sound source; and upsampling the equalization and, position filters to an original sampling frequency; and composing the upper equalization filters and the lower equalization filters to obtain a smooth link between low frequencies and high frequencies.