Automotive industry is always focused on the acoustic comfort of its products, ranging from utility
vehicles to GT and Sport cars. On one hand, Internal Combustion Engine (ICE), are getting
increasingly quieter, on the other hand, new challenges are rising with the diffusion of Electric
Vehicles (EV). Moreover, the continuous improvement of internal noise in vehicle cabins requires
more and more powerful techniques to reach target performance and improve the quality
perceived by customers.
Single microphone measurements can only provide information about overall level or spectral
content of the noise. Instead, acoustic source mapping with microphone array-based techniques
can accomplish source localization, separation of contributions and quick troubleshooting. Given
the huge number of techniques, variants and possible classifications, it could be tricky for a
newbie user to pick up the best method for a particular application. The knowledge of the basic
concepts about different array designs and acoustic mapping techniques enables the user to
choose the best combination for each use case.
A general overview of acoustic mapping methods will clear up the ideas about pros and cons of
beamforming algorithms, deconvolution techniques and inverse methods. Also, general guidelines
about the choice of suitable microphone array layout will be provided. Practical examples will
show the whole source mapping process and the effect of the most influencing parameters in the
application of these powerful measurement techniques.