Spinoff
Company of
The
University of Parma
Computation of filter coefficients
•No theory is assumed: the set of
hi,j filters are derived directly from a set of impulse response measurements,
designed according to a least-squares principle.
•In practice, a matrix of impulse responses is measured, 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.)
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