| 摘要 |
PURPOSE: A device for measuring natural frequency of audible sound is provided to display a natural frequency of audible sound by removing high frequencies, harmonics and noise via a microphone and a schmitt circuit. CONSTITUTION: A device for measuring natural frequency of audible sound includes an input part(100) for generating an input voltage for an input audible sound signal, a signal converter(110) for amplifying the audible sound signal transmitted from the input part and setting a blocking frequency of the amplified audible sound to filtering harmonics, a schmitt circuit(120) for removing noise of the audible sound withdrawn from the signal converter, a counter(130) for setting a reference time and counting the number of clock for an input waveform withdrawn in the schmitt circuit for the reference time, and a display part(140) for displaying the counted clock number. |
