•No theory is
assumed: the set of hij filters are derived directly from a set of impulse response measurements, designed according to a least-squares principle.
•In practice, a
matrix of filtering coefficients, is formed, and the matrix has to be numerically inverted (usually employing some regularization technique).
•This way, the
outputs of the microphone array are maximally close to the ideal responses prescribed
•This method
also inherently corrects for transducer deviations and acoustical artifacts (shielding, diffractions, reflections, etc.)