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18.05.2006 Angelo Farina
UNIPR / ASK Industries | All Rights Reserved | Confidential
Conclusions
§The sine sweep method revealed to be
systematically superior to the MLS method for measuring electroacoustical impulse responses
§In fact, it
is now employed in top-grade measurement systems, including Audio Precision (TM) or Bruel &
Kjaer’s DIRAC software
§Traditional methods for measuring “spatial
parameters” proved to be
unreliable and do not provide complete information
§The 1°-order
Ambisonics method can be used for generating and recording sound with a limited amount of
spatial information
§For obtained better spatial resolution,
High-Order Ambisonics can be used, limiting the spherical-harmonics expansion to
a reasonable
order (2°, 3° or 4°).
§Experimental hardware and software tools have
been developed (mainly
in France, but also in USA), allowing to build an inexpensive complete measurement system
§From the
complete matrix of measured impulse responses it is easy to derive any suitable subset, including
an highly accurate binaural
rendering over head-tracked headphones.