Improvements on the directional characteristics of a calibration sound source using the Boundary Element Method

Vicente Cutanda Henriquez (Foredragsholder)

Aktivitet: Foredrag og mundtlige bidragForedrag og præsentationer i privat eller offentlig virksomhed


The project Euromet-792 aims to investigate and improve methods for secondary free-field calibration of
microphones. In this framework, the comparison method is being studied at DFM in relation to the more usual
substitution method of microphone calibration. The design of the sound source is of particular importance
to achieve a sound field that reaches both microphones with the same level and that is sufficiently uniform at
the microphone positions, in order to reduce the effect of misalignment. An existing sound source has been
modeled using the Boundary Element Method, and the simulations have been used to modify the source and
make it suitable for this kind of calibration. It has been found that a central plug, already present in the
device, can be re-shaped in such a way that makes the sound field on the microphone positions more uniform,
even at rather high frequencies. Measurements have been carried out in order to verify the goodness of this
Emneord: BEM, Sound Source, Calibration, microphone
Periode2. jul. 2008
BegivenhedstitelAcoustics 08
PlaceringParis, Frankrig