Patent Document ID: 8355510
Application ID: 11487597
Patent Flag: 1

Claim One:
1. A method to equalize frequency responses within a frequency range in a listening area, comprising: measuring frequency responses in the listening area generated by at least one acoustic transducer at an at least one listening point, resulting in a matrix of frequency responses; inverting the matrix of frequency responses to determine a vector of correction filters for the at least one acoustic transducer; performing a global magnitude equalization, with respect to a target function on a resulting vector of frequency responses that is the result of multiplying the vector of correction filters with the matrix of frequency responses; performing a global group delay equalization on the resulting vector of frequency responses, where performing a global group delay equalization further includes, replacing equalization filters by minimum-phase versions outside of a predetermined frequency range of 20 Hz-80 Hz where the at least one acoustic transducer operates in the frequency domain; and determining final equalization filters in a time domain with an inverse Fourier transform of the resulting vector of frequency responses after performance of the global group delay equalization.