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 are derived
directly from a set of impulse response measurements, designed according to a
least-squares principle.
Novel approach
130th AES Convention –
London 13-16 May 2011