https://blog.gongquiz.com/2022/01/18/%eb%8b%a4%ec%9d%8c-%ec%a4%91-%eb%82%98%ec%9d%b4%ed%80%b4%ec%8a%a4%ed%8a%b8nyquist-%ed%91%9c%eb%b3%b8%ed%99%94-%ec%a3%bc%ed%8c%8c%ec%88%98fs%eb%a1%9c-%ec%95%8c%eb%a7%9e%ec%9d%80-%ea%b2%83%ec%9d%80/