| 摘要 |
A signal processing device is composed of an acquiring unit, a filter unit and a changing unit. The acquiring unit acquires a signal indicating vibration of a string. The filter unit performs convolution operation on the signal acquired by the acquiring unit according to a filter coefficient and outputs a resulting signal. The filter coefficient is set such that the resulting signal has a frequency response containing a plurality of peak waveforms associated with resonance of a body of a stringed instrument within a specific frequency range. The changing unit changes the filter coefficient so as to change a peak value of each of the peak waveforms while maintaining a width of each of the peak waveforms in the frequency response.
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