The influence of the hole structure of the violin code on the vibration modes and dynamic frequency response of the violin is a complex research field that involves multiple disciplines such as acoustics, physics, and musicology. We can explore this issue from several aspects.

Firstly, the diameter and position of the holes in the violin have a direct impact on the sound of the violin. In a study conducted in 1983, the effects of changing the diameter of the piano code hole (6 mm) and adjusting the mode frequencies of the top and bottom plates on violin sound were investigated (2nd floor). This indicates that by adjusting the physical properties of the code holes, the vibration modes and dynamic frequency response of the violin can be influenced.

Secondly, the geometric shape of the code holes also affects the frequency characteristics of the violin. A study in 2021 showed that geometric parameters between the sound hole and the main cavity of woodwind instruments, such as the presence and size of curvature radius, can affect the frequency characteristics of the air column (3rd floor). Although this study is focused on woodwind instruments, it provides a theoretical framework to illustrate how the geometric shape of the code holes affects the vibration modes and dynamic frequency response of the instrument.

In addition, the interaction between the holes in the violin code can also affect the sound of the violin. A 2012 study proposed a method that considers the interaction between external sound holes, which improves the traditional transfer matrix method (TMM) by increasing radiation energy, slightly reducing low-frequency resonance frequency, and significantly modifying the response near and above the cutoff frequency of the sound hole grille (4th floor). This indicates that the interaction between the code holes is crucial for understanding and predicting the dynamic frequency response of the violin.

Finally, the high-frequency resonance of the violin body can be simulated using a digital waveguide grid model, which is used as a "small box reverberator" to find a grid with sufficient similarity to the high-frequency resonance of the real violin body (5th floor). This indicates that by precisely controlling the resonance characteristics of the high-frequency part, the dynamic frequency response of the violin can be optimized.

The influence of the hole structure on the vibration mode and dynamic frequency response of the violin is mainly reflected in the diameter, position, geometric shape, and interaction between the holes. Through in-depth research on these factors, we can better understand the sound characteristics and performance of the violin