PROBLEM TO BE SOLVED: To provide a device for controlling a damage caused by crows, that can effectively keep off the crows.SOLUTION: The device for controlling the damage caused by the crows includes: a pulse generation circuit 1 generating a pulse signal with predetermined frequency lower than audio frequency an amplifier 2 amplifying the pulse signal and a speaker 3 for repelling the crows by generating pulsed sound corresponding to the amplified pulse signal. Then, the crows fly off to avoid infrasonic frequency.COPYRIGHT: (C)2012,JPO&INPIT【課題】カラスを効果的に追い払うことが可能なカラス害防除装置を提供する。【解決手段】このカラス害防除装置は、可聴周波数よりも低い所定の周波数でパルス信号を発生するパルス発生回路1と、パルス信号を増幅する増幅器2と、増幅されたパルス信号に応答してパルス的に音を発生し、カラスを追い払うスピーカ3とを備える。カラスは、超低周波数の音を嫌って飛び去る。【選択図】図1
