Fourier transform 내적(Dot product) : Calculate how similar the two signals are. 내적(x(t), 회전 함수) : The expression that how much frequency there are in x(t). ② Identify Signal Components. ③ Remove unnecessary frequency components. ④ Synthesize 3, it can obtain a signal with the high frequency noise removed. https://www.youtube.com/watch?v=YsG8fJsH9JE
