For the same vehicle model, a glass sliding squeaking noise evaluation was conducted. The position of the microphone was the same as that in the proximity wind noise test, at the center of the belt at a distance of 100 mm. The measured noise was converted into an SPL color map for time and frequency in the spectrum analysis, as shown in Figure 21. In the evaluation of the base sample, periodic noise was observed in the frequency range of 0.1 and 1 kHz, but in the revision sample, this noise was clearly disappeared.