Abstract
This paper describes analysis of timbre and design of filter circuit in order to develop an assist device for tuning of shamisen. Sound of the shamisen consists of harmonic and noise components, and has a unique tone color by sawari mechanism. The shamisen has a feature that harmonics is greater than fundamental. In addition, the sound of the shamisen contains non-integer harmonics. Therefore, unrequired frequency components are filtered out used filter circuit in order to measure fundamental frequency. The filter circuit is used low pass filter of Chebychev characteristic. As a result of verification by actual equipment, it is possible to get the fundamental frequency by the filter circuit.
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