https://blog.gongquiz.com/2022/01/04/%ec%8b%a0%ed%98%b8-%eb%8c%80-%ec%9e%a1%ec%9d%8c%eb%b9%84%ea%b0%80-15%ec%9d%b4%ea%b3%a0-%eb%8c%80%ec%97%ad%ed%8f%ad%ec%9d%b4-1200hz%eb%9d%bc%ea%b3%a0-%ed%95%98%eb%a9%b4-%ed%86%b5%ec%8b%a0%ec%9a%a9/