The spatial properties and local active control of road noise

Invited paper

Stephen Elliott


Wednesday 3 june, 2015, 09:40 - 10:00

0.7 Lisbon (47)

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.

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