RAILROAD CROSSING ALARM SOUND MONITORING DEVICE

To provide a railroad crossing alarm sound monitoring device which can detect an alarm sound accurately with a simple circuit configuration.SOLUTION: A railroad crossing alarm sound monitoring device 1 comprises: a differential half wave AMP 22 to which an acoustic pressure signal is inputted from an acoustic pressure sensor 60 provided near a railroad crossing alarm; a first integral amplifier circuit 25 to a third integral amplifier circuit 27 to which an output signal of the differential half wave AMP 22 is input; and an MPU 3 which calculates the number of rumbling of an alarm sound of the railroad crossing alarm per unit time on the basis of the output signal of the first integral amplifier circuit 25 to the third integral amplifier circuit 27.SELECTED DRAWING: Figure 1 【課題】簡易な回路構成で警報音を精度良く検出することができる踏切警報音監視装置を提供する。【解決手段】踏切警報音監視装置１は、踏切警報機の近傍に設けられた音圧センサ６０から音圧信号が入力される差動半波ＡＭＰ２２と、差動半波ＡＭＰ２２の出力信号が入力される第１積分増幅回路２５～第３積分増幅回路２７と、第１積分増幅回路２５～第３積分増幅回路２７の出力信号に基づいて踏切警報機の警報音の単位時間当たりの鳴動数を演算するＭＰＵ３と、を備えている。【選択図】図１