| 摘要 |
PROBLEM TO BE SOLVED: To provide a golf club suitable for a device triggered by sound having been collected in a microphone.SOLUTION: A golf club comprises a head 31 to which an impact force is applied by hitting a ball, and a resonance member 32 that is fixed to the head 31 and oscillates at a specific frequency by receiving an impact force. Owing to the configuration of the golf club with the resonance member 32 fixed to the head 31, sound at a specific frequency to cause oscillation of the resonance member 32 is emitted from the head 31 to increase a sound pressure of the sound at the specific frequency. Meanwhile, a noise level becomes lower as a frequency band subject to detection becomes narrower in general. Therefore, by using the sound at the specific frequency as a trigger, the noise level can be reduced while the sound emitted from the head 31 at the specific frequency is maintained in a high level, thereby making it possible to suppress erroneous activation of a device triggered by sound having been collected in a microphone due to ambient noise. |
