Factor affecting dynamic feeling of vehicle sound related to firing-order component and its effect

As consumers' expectations for the perceptional feeling of vehicles increase, the studies on sound design to improve the dynamic feeling have been actively conducted. The purpose of this study is to propose relevant factors to improve dynamics without reducing pleasantness. To this end, subjective tests were conducted to evaluate dynamic and comfortable feelings on the noises during the acceleration of two comparison vehicles. A factor based on the TNR (tone-to-noise ratio) of ISO7779, TNRorder was extracted that could represent the feature of tonality of non-stationary signals. A vehicle having high TNR order related to the first firing-order exhibited a strong dynamic feeling. It was also investigated that dynamic feeling could be increased after changing the TNRorder of the first- and second firing order components of the test vehicle through subjective test.