This paper presents and evaluates a personal sound zone system dedicated to the automotive industry. The goal is to provide a broadband system (between 100 Hz and 10 kHz) that provides a sound level contrast between different programs of at least 30 dB and a rather low reproduction error. To do this, two different speaker arrays are used: an array of eight speakers distributed on the two front headrests for the low-frequency part and arrays of 16 micro speakers for the high-frequency part (each one being located close to an ear of the two front passengers). The classical pressure matching algorithm and its weighted version are used to calculate the filters to be applied to each source. An optimisation procedure is applied to find the best set of Lagrange multipliers. Simulation results computed with point sources in a shoe-box shaped room are first used to study, analyze and optimize the array geometries. Then, measurements are performed in a semi-anechoic chamber with added wooden panels to evaluate the actual performance of the system. Finally, the results are summarized before concluding with future work directions.
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