Acceptance of synthetic driving sounds in the interior of electric vehicles

Meanwhile the concept of electric vehicles is well known, but still consumers have little personal experiences about driving electric vehicles. In order to improve the perceived quality of an electric vehicle, the optimization of the interior noise and vibration is highly relevant. But, how must an electric vehicle sound, what is the target sound of a certain electric vehicle, can NVH knowledge and experiences from the past be used for the optimization of modern electric vehicles as well? In order to find answers to such questions it seems necessary to clarify the notion of product sound quality first.