Abstract
This paper describes sound generation of a frog shaped guiro made of wood. By robbing a dorsal fin like a saw tooth on the frog shaped guiro with a wooden stick, the guiro generates the sound like a frog's voice. The relation between the impulsively exciting force and sound pressure was measured with an accelerometer and a microphone. The FEM modal analysis revealed that the frog shaped guiro had four dominant modes of vibration which could be characterized by motion of mouth of the guiro. The frequency spectrum of the sound pressure radiating from the guiro excited by sequential impulsive forces was theoretically estimated. It was then revealed that the variation of driving point mobility of the dorsal fin and amplitude of the exciting force affected to generate sound like a frog's voice.
