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18.09.2008 Angelo Farina
Complete
high-order MIMO method
§Employing
massive arrays of transducers, it will be feasible to sample the acoustical temporal-spatial transfer function of a room
§Currently available hardware and software tools make this practical
only up to 4° order, which means 25 inputs
and 25 outputs
§A
complete measurement for a given source-receiver position pair takes approximately 10 minutes (25 sine sweeps of 15s each are generated one
after the other, while all the microphone signals
are sampled simultaneously)
§However, it has been seen that real-world sources can be already approximated quite well with 2°-order functions, and even the human
HRTF directivites are reasonally
approximated with 3°-order functions.
Portable PC with 24in-24out channels
external sound card
2°-order 9-loudspeakers source
(dodechaedron)
3°-order 32-capsules microphone
array