There is a corresponding relationship between graphics and frequency. For Figure 1, if only the graph does not have a corresponding frequency, it can only be known that the violin has certain vibration patterns. The third image, the left and right images have similar vibration patterns, but the left image corresponds to 513Hz and mode 10. The image on the right corresponds to 544hz, mode 13. The right image below the fourth image corresponds to 524Hz, mode 11, and its graphics are similar to the two graphics in the third image. Their commonality is that the panels experience cross torsional vibrations. The backboard is subjected to three horizontal waves of vibration. Because there is no corresponding spectrum, it is unknown whether the frequency of the graph is the peak. Let's assume it's a peak first!

If the figure in the upper left corner and the figure in the lower right corner of Figure 4 are from the same violin, according to the annotation in the upper right corner of Figure 4, the AO of this violin is 266Hz, while the B1+annotation in the lower left corner is 524Hz. Based on the figure and corresponding frequency data, then this violin is a violin with decent sound quality but a thinner plate. Figure 3: The left image shows the Siqin, and the right image shows the Guaqin. However, it is not specified whether the frequency corresponding to the graphic is B1+, nor is there frequency data for A0, so the sound quality cannot be inferred. But please note that in my personal opinion, the data provided by Schleske from Germany in Figures 3 and 4 may be misleading. His so-called frequency standards: AO266Hz, B1+524Hz, are somewhat lower. These data are mostly parameters of thin and soft violins. After the size of the violin is determined, that is, the volume of the violin case and the f-hole are determined, the frequency of its air sound is determined, AO,B1-,B1+, It is related to the softness and hardness of the piano board, and needs to be coordinated with the sound of the air.