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FFT-Analysis

linie 940

The FFT- Measurement (Fast Fourier Transform) is a further assistance for a luthier during the construction of a guitar and is used for a better control and overview of the entire frequency range of an instrument.

In this procedure, the bridge is activated mechanically by a knock impulse. The resulting vibrations of the whole instrument are picked up by a microphone and can be illustrated graphically like you can see in the picture beneath.

 

fft diagramm

The individual frequency response with its significantly shown resonant peaks varies from guitar to guitar with some considerable differences and can thus be seen as a personal fingerprint of any instrument. The frequencies and sound pressure levels of the individual 'peaks' can be read out very clearly, ensuring a solid estimation about the classification of the guitar sound. This process can be included during the construction, to change certain parameters before the completion, if necessary.

Thus, the cavity frequency, for example, depends, among other sings, on the thickness's of top, back and sides and deliver by its frequency, information about the future bass radiation of the instrument. Therefore the tone colour of a guitar with a low tuned cavity resonance sounds darker, rounder, more voluminous than her opponent, which is tuned slightly higher. The cavity frequencies of different guitars can usually be found between F 87.3 Hz (tuned low) and G # 103.8 Hz (tuned high).

If you are measuring the cavity resonance during the construction and you are thinking that it's too high, you can for example by reducing the thickness of the top, lower the resonance.

In this way, you've got several options to realize specifically your own imaginations of sound, as well as the imaginations of the customer.

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© 2013 by Dominik Wurth

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