Fourier Transforms: The Math That Made Color TV Possible

“A Fourier transform maps time to frequency,” explains Ryan Hamerly, principal investigator at Silicon Valley R&D startup NTT Research Popular mechanics. “So if you have a piano piece, the waveform you pick up with a microphone is a time-varying signal. But people are also interested in things like spectrum in this case – which notes are played most often, which part of the spectrum is loudest – and that would be the frequency content.” Understanding Fourier Transforms: The Math That Gave Us Color TV (popularmechanics.com)