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- W2186019194 abstract "All strings instruments function in the same way : a driving system ‐the strings‐coupled with a radiating surface ‐the-soundboard‐ via an intermediating element ‐the bridge. The acoustic qualities are determined by the particular organization of these three elements: Exciter - Coupling - Resonator. The art of instrument making is in the optimum transformation from mechanical energy of the strings into radiating acoustical energy. Holding all other parameters constant between two given instruments, this radiated energy depends on both the modal shape of the eigenmodes of the soundboard and the location of coupling. There is always a compromise between different parts of the spectrum depending on the eigenmodes that radiate efficiently and those that radiate weakly. Indeed, whenever eigenmodes are symmetrical the far-field radiation for even-modes reaches its minimum by the destructive interference of its acoustic sources. On the other hand, if the modal geometry is odd, the radiation is maximized. Taking this into account, instrument makers working to create functional asymmetries such as all modes radiate as close to their respective maxima as possible. Should they arrive at a spectrum that lacks a given eigenmode of vibration, the structure does not radiate. The perceptual signature of a given instrument, therefore, depends on the adjustment of maxima and minima of radiation. A new manner of radiation optimization is possible by splitting the radiating element : the soundboard. We can first, by adjusting the modal properties of each of the aforementioned elements, ensure that the maximum radiation of an element corresponds to the minimum of the other element. As a result, a more homogeneous acoustical response is achieved. In addition, by judiciously choosing the location of coupling, we can systematically create asymmetries in the geometry of eigenmodes. As a consequence, the far-field radiation is considerably improved. Furthermore, by coupling these split elements, an exchange of energy is carried out in real time, thereby enriching the resultant sound. So, by assigning to each soundboard component a dedicated part of the spectrum to be radiated, a new paradigm of sound optimization is arrived upon. This paper presents a model and some measurements that endeavor to substantiate the model discussed above. A violin and a guitar will be shown and played. (patents pending)" @default.
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- W2186019194 date "2010-01-01" @default.
- W2186019194 modified "2023-09-26" @default.
- W2186019194 title "A new concept for string-instrument sound board : the splitting board" @default.
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