The spatial properties and local active control of road noise
Invited paper
ISVR
Wednesday 3 june, 2015, 09:40 - 10:00
0.7 Lisbon (47)
Abstract:
The spatial performance of local active control systems depend on the
correlation properties of the primary sound field. Previously this sound field
has generally been assumed to be diffuse when simulating active control
performance. In this study the spatial properties of the primary sound field due
to road noise in a car was measured using the spectral density matrix calculated
from the outputs of an array of 25 microphones in front of a headrest, into
which a number of secondary sources had been integrated. The spatial
correlation properties of the primary field were estimated and inverse methods
were also used to estimate the sources of the road noise. Predictions were then
made of the performance of local active sound controllers using the secondary
sources in the headrest.