Utilizing the sound of predators to cast out wild animals
Recently, there have been many reports of damages caused by animals such as wild pigs and wild dogs in the rural farms of Korea. Damages were extensively widespread from agricultural crop and produce to domestic animals. To efficiently cast out wild animals, the recorded sound of predators such as lions and tigers was used. The speakers were installed around the farms and broadcasted the sound of predators every 3 h. Although the damages were a little bit reduced after broadcasting, it did not complete its purpose and still some damages were reported. We analyzed the recording quality of the sound and found out some deficiencies in it, the lack of low frequency sound below 100 Hz in particular. In order to improve its sound quality, we installed the speakers inside of water pipes with 1 m in diameter. As a result, we earned 90% in the index of similarity between the original crying sound and the broadcasted crying sound of predators in its sound spectra. Since the improved sound recording was broadcasted ...