Traditional design of the filters
The
processing filters hmv are usually computed following one of
several, complex mathematical theories, based on the
solution of the wave equation (often under certain
simplifications), and assuming that the microphones
are ideal and identical
In some implementations,
the signal of each microphone is processed through a digital filter
for compensating its deviation, at the expense of heavier computational
load
outputs of
the microphone array are maximally close to the
prescribed ideal responses
This method
also inherently corrects for
transducer deviations and acoustical
artefacts (shielding, diffractions, reflections, etc.)
No theory is assumed:
the set of hmv filters is derived directly from a set of impulse response
measurements, designed according to a least-squares principle.
Novel approach
The Acoustics of Ancient
Theatres Conference