supplemental if you care about details https://en.wikipedia.org/wiki/Joseph_Fourier https://en.wikipedia.org/wiki/Joseph_Fourier https://betterexplained.com/a

supplemental if you care about details https://en.wikipedia.org/wiki/Joseph_Fourier https://en.wikipedia.org/wiki/Joseph_Fourier https://betterexplained.com/articles/an-interactive-guide-to-the-fourier-transform/ https://betterexplained.com/articles/an-interactive-guide-to... http://hyperphysics.phy-astr.gsu.edu/hbase/Audio/fourier.html http://hyperphysics.phy-astr.gsu.edu/hbase/Audio/fourier.htm...