illustration of Fourier transform
Published:
discrete Fourier transform, illustrated geometrically. for each frequency, the dot product of the signal with a sine as well as a cosine is calculated. the power at that frequency corresponds to the length of the vector that has the 2 dot products as x- and y-entries. pic.twitter.com/goF0TsO0I5
— Natalie Schaworonkow (@nschawor) November 19, 2020