Abstract
The effects of configuration changes on the acoustical response in a vehicle cabin were measured for a middle-class sport-utility vehicle (SUV) with a maximum of five passengers. The measurement results showed that the effect of posture on the binaural response was relatively larger than the case when changing seats. Moreover, the sound field delivered from a nearby source and the range with a higher signal-to-noise ratio were relatively robust. The overall performance degradation can be predicted, based on these measurement results, and the required level of margin to maintain the target precision can be determined. A sufficiently wide control volume should be selected to cover the possible range of ear positions, because the acoustic response at the receiver's position can differ significantly, according to the individual's posture and physique. It is also observed that a sound field delivered from a near source is more robust than for far sources. This means that it is advantageous to place the sound source near the control area.
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