Finally, frequency filtering technique is adopted and combined with the regression equation to reveal the effect of the designatedfrequency range on in-car noise preference.
最后采用频域滤波技术，识别出指定频率段对车内噪声偏好性的影响。
2
However, when one may optimize structure with a specially designatedfrequency, the ones lower than the frequency should be avoided to save time and to improve computing precision.